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Document:	LA36/LA35 DECwriter II User's Manual
Order Number:	EK-LA3635-OP
Revision:	002
Pages:	138
Original Filename:

OCR Text

DECWRITER i

TABLE OF CONTENTS
Page

SECTION 1

LA36 USER’S INFORMATION

LA36 GENERAL INFORMATION . . . .
e
e e e e e e e e e e e e e e e e s e
e e e e e e
INtrodUCtiON . . . o v e e
e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e
OPTIONS & v v v o e v e e e e e e e e e e e e e e e e e e e e
e e e e e
e e e
LA36 DECwriter Model Variations . . . . . . v i i i i i e e e e e i e e e e e e e e e e e e e e e e
LA36 Jumper Configurations . . . .. .. .. ... ...
... e
e e e e e e e e e e e e e e e e
LA36 Specifications . . . . . . . .
e e e e e e e e e e e e e e e e e
ee e e e e e e e

1-1
1-1
1-1
1-3
1-3
1-4

LA36 OPERATOR'S GUIDE . . . . .
e e e
e e e e e e e e e s e e e e
e e e e e 1-5
LA36 Operator Controls and Indicators . . . . . . . .
i i i i i e e e e
e e e e e e
e e e e e e 1-b
Usingthe LA36 . .. ........... e
e e e
e
e
1-11
LA36 INSTALLATION AND CHECKOUT GUIDE . . . . . . .
General Installation Information

Unpacking and Repacking

. . . . . . . . . . . . o i

. . . . . . . . . .

Checkout and Acceptance Procedures

e e

e e e e

e e

e e e

. . . . . . . . i o i i i i

CONTROLS AND INDICATORS FOR LA36 OPTIONS
Forms Control Option (LAXX-KV) . . . . .

e e e

e
e e

e e

e e e e e e e e e

e e e

. . . . . .

Acoustical Coupler Option (LAXX-LM)

SETUP AND OPERATING PROCEDURES FOR LA36 OPTIONS
APL Option (LAXX-PK)

. .

. .. ... e

e e

e 1-12

e 1-14
e 1-14

. ... ... .. ... 1-14

e e e

e 1-14

e e e e e e e e e e e e e

e 1-14

. . . . . . . . . . et 1-15

e e e e

Forms Control Option (LAXX-KV) . . . . . o

e e e 1-12

e e

e e e e e e

e e e 1-12

e e e e e e e e e e e e e

. . . . . o o

. . . .

e e

Forms Control, Vertical Tabulation, and Horizontal Tabulation Option (LAXX-KY)

Scale, Pointer, and Window Option (LAXX-LN)

e e e e e

e
e e

e 1-15

e e e e e e e e e e

e 1-15

Forms Control, Vertical Tabulation, and Horizontal Tabulation Option (LAXX-KY)

... ... .. .. .

Automatic Line Feed Option (LAXX-LA)

.. . . . ... .. . ... .... e

Automatic Answerback Option (LAXX-KX)

. . . . .

e e

e e e e

e e

e e e

1-17

e 1-18

e e 1-19

TABLE OF CONTENTS (Continued)

Page

Selective Addressing Option (LAXX-KW)
Acoustical Coupler Option (LAXX-LM)

... .. ... ... . . . . .. ...
. . ... ...

1-19

... .

1-24

INSTALLATION AND CHECKOUT OF LA36 OPTIONKITS

. . .. ... ... .. .. 1-25
. . . ...
1-25
Expander Option Mounting Kit (LAXX-LB) .. ... ... .. e
e e e e e
e
1-25
Introduction

APL Option Kit (LAXX-PK) . . . ..
. 1-26
Forms Control Option Kit (LAXX-KV)
. .. ... .
1-32

Forms Control, Vertical Tabulation, and Horizontal Tabulation,
Option Kit (LAXX-KY)

. . o 1-34

Automatic Line Feed Option Kit (LAXX-LA) . . . . .. . .. .

Selective Addressing Option Kit (LAXX-KW)

Automatic Answerback Option Kit (LAXX-KX)

EIA Interface Option Kit (LAXX-LG)

14-Key Numeric Pad Option Kit (LAXX-KE)
Paper Out Option Kit (LAXX-KZ)

1-42

. . . .. .. . ... . .

1-42

. . .. ..

1-44
1-46

. . . ..

20 mA (DEC 10) Cable Option Kit (LAXX-LK)

1-49
. . . . . . .

Scale, Pointer, and Window Option Kit (LAXX-LN)

1-49

. . . . .. . .

1-52

. . . . . 1-54

Acoustical Coupler Option Kit (LAXX-LM)

SECTION 2

1-40

. . . . .. .

20 mA Cable Option Kit (LAXX-LH)

DF11 Adaptor Kit (LAXX-KH)

1-37

. . . .. .. ..

. .. .. .. . .

Compressed Font Option Kit (LAXX-KJ)

1-36

. . .. . .. .. .. .. ..

. . . . . . . .

1-64

LA35 USER’S INFORMATION

LA35 GENERAL INFORMATION

. . . . . o

Introduction

2-1

. . . . L

2-1

OPtioNs . . .

2-1

LA35 DECwriter Model Variations
LA35 Jumper Configurations

LA35 Specifications

. . .. . .. . . .. .

2-2

. . . . . . . . . ..

2-2

. . . . . . ...

LA35 OPERATOR'S GUIDE . . . . . . .
LA35 Operator Controls and Indicators
Usingthe LASD

. . . . . . . . .

2-4
v o i i

2-4

. . . L .

2-6

LA35 INSTALLATION AND CHECKOUT GUIDE

e s,

2-7

. . .. .. . . . . .. .

2-7

General Installation Information
Unpacking and Repacking

2-3

. . . . . . .

. . . . . . . . . . .

Checkout and Acceptance Procedures

2-7

. . . . . . . . .

CONTROLS AND INDICATORS FOR LA35 OPTIONS

2-7

. . . . . . s

2-9

Forms Control Option (LAXX-KV) . . . e
e

2-9

Forms Control, Vertical Tabulation, and Horizontal Tabulation Option (LAXX-KY)

. ... ... ... ..

2-9

Scale, Pointer, and Window Option (LAXX-LN)

Acoustical Coupler Option (LAXX-LM)

. . . . .

. . . . . . .
e

SETUP AND OPERATING PROCEDURES FOR LA35 OPTIONS
APL Option (LAXX-PK)

e e e e e

. . . . o o

2-9
2-9

e e e e e e

e 2-10

. . e 2-10

Forms Control Option (LAXX-KV) . . . . . .

e e

Forms Control, Vertical Tabulation, and Horizontal Tabulation Option (LAXX-KY)

e 2-10

... .. ... .. .. 2-10

TABLE OF CONTENTS (Continued)
Page

2-12
Automatic Line Feed Option (LAXX-LA) . . .o
2-13
e
o
Automatic Answerback Option (LAXX-KX) .o o
2-13
e
o
Selective Addressing Option (LAXX-KW) . .. o
2-17
Acoustical Coupler Option (LAXX-LM) . . oo i
2-18
e
e
e
e
e
e
e
e
e
e
e
e
INSTALLATION AND CHECKOUT OF LA35 OPTION KITS . . s e e e e e
2-18
INTrOAUCTION .« o v v e e e e e e e e e e e e e e e e e e e e e e
e e e 2-18
Expander Option Mounting Kit (LAXX-LB) . . ..o v v
2-21
e
e
e
e e
APL Option Kit (LAXX-PK) . o oo i
2-21
Forms Control Option Kit (LAXX-KV) . .00 e
Forms Control, Vertical Tabulation, and Horizontal Tabulation

e 2-24
Option Kit (LAXX-KY) .o oo
e e 2-27
e
e
e
e
Automatic Line Feed Option Kit (LAXX-LA) . . . o oo v i v
e e e 2-27
e
e
e
o
Selective Addressing Option Kit (LAXX-KW) . .o oo o
e 2-30
e
e
e
e
o
Automatic Answerback Option Kit (LAXX-KX) .o oo v o
2-32
t
EIA Interface Option Kit (LAXX-LG) . . . oo v v
2-32
e
e
e
o
Compressed Font Option Kit (LAXX-KJ) .o o
2-36
20 mA Cable Option Kit (LAXX-LH) . . . .
e
e
e
e
e
20 mA (DEC 10) Cable Option Kit (LAXX-LK) . .. v 2-36
Scale, Pointer, and Window Option Kit (LAXX-LN) .o e e e e e e e e e 2-39
e 2-41
DF11 Adaptor Kit (LAXX-KH) . . .o
e e e e 2-41
e
o
Acoustical Coupler Option Kit (LAXX-LM) . . . . oo o
SECTION 3

COMMON INFORMATION

e 3-1
LOADING PAPER AND CHANGING THE RIBBON . . . . ..o 3-1
e e
Loading Paper . . o v v vt e e e
e e e e 3-1
e
i
Loading New FOIMS . o o o v v oo
Paper Positioning Procedure . . . . . oo oo
Impression AdJUSTMENT . . o . . o v v v vt
e
Horizontal Positioning Adjustment . . . . . . o v v v v v v e v
e
e
e
e
e
e
e
e
o
v
o
v
«
Fine Vertical POSItIONING .« v«
e e e
Reloading Paper. . . v v o v v o o e e
e e e e e e e e e e
e
e
e
e
e
e
o
o
v
Ribbon INstallation. . .« o

3-1
3-4
3-b
3-5
3-6
3-7

3-10
e
e e e
DECwriter Interface Information . . . o v v v o v i i e e
3-10
e
e
e
e
e
e
e
e
e
e
e
i
v
Interface DesCriPtion . . o . v v v o
e e 3-10
Interface SPeCifiCations . . . . . o o v v
e e 3-11
e e e
e e e e e e e e e e
e
e
e
e
i
PROGRAMMER'S GUIDE . . . . .
3-11
e
o
o
oo
.
.
.
.
.
.
LA36 Programmer’s INformation
3-11
i
v
v
o
..
.«
.
.
.
.
Transmitting Characters and Commands
3-11
e
e
e
e
e
e
e
e
e
e
e
e
e
i
i
v
v
v
o
.
Special Command KEBYS .

Receiving Characters and Commands . . . . . . . . o oo e 3-11
e 316
OPERATOR CARE, PACKING, AND REPACKING . . . . .o
3-16
e
e
e
e
e
e
et
e
e
e
v
v
v
OPEFALOr CArE . « v o
3-16
e
e
vt
o
v
v
v
.
.
.
.
Unpacking and INSPECtiON
e
e e 3-18
e
Packing Procedure . . . . . o o v vt e
e e et 3-19
e
e
TROUBLESHOOTING GUIDE . . . . o

PREFACE

The LA36/LA35 is a simple, dependable addition to your company’s processing system. It has been designed to
maintain optimum performance for many years while keeping maintenance at a minimum.

This user’s manual is a guide to the simple procedures required to operate your LA36/LA35. However, to ensure
crisp copies and maximum equipment life, the user must adhere to the following:
®

Perform the impression adjustment (when required) as described in this manual.

Replace the ribbon (when required) only with DIGITAL-recommended ribbons.
NOTE

This manual is applicable to the following model DECwriters:
LA36-CE

LA36-CF

LA36-CH
LA36-CJ
LA36-DE
LA36-DF
LA36-DH

LA36-DJ

LA35-CE

LA35-CF
LA35-CH
LA35-CJ
LA35-DE
LA35-DJ

All octal codes used throughout this manual refer to 7-bit ASCII.

SECTION 1

LA36 USER’'S INFORMATION

' LA36 GENERAL INFORMATION
Preprinted forms can be positioned for the best print-to-

INTRODUCTION

line-positioning incidence through the use of the manual

The LA36 DECwriter Il is a medium-sized, low-cost,
interactive data communications terminal. It is designed

vernier paper advance adjustment.

as an input/output device that can be used as a system

command console or as a remote communications

The keyboard is a standard ASCli-coded keyboard,
consisting of alphanumeric characters and nonprinting
system control codes. The ASCII code set consists of

terminal.

The LA36 incorporates a low-speed impact printer for
hard copy output and a standard ASCI| keyboard for
transmitting data to the host system or to another data

upper and lower case characters and prints at a hori-

zontal spacing of 10 characters per inch and a vertical
spacing of 6 lines per inch. The CAPS LOCK switch on
the keyboard allows selection of a reduced number of

communication terminal(s).

The printer is capable of handling multipart and multi-

ASCII characters.

form line printer paper from 3 to 14-7/8 in. (7.62 to
37.78 cm) wide.

OPTIONS

The basic LA36 DECwriter Il can be expanded to provide the user with a number of functional options for
receiving, transmitting, and handling data. These functional options are described in the following table.
LA36 Options

Options

Name

Control

Description

Switch/Indicator

LAXX-LB

Expander Option

None

The Expander Option Mounting Kit includes

LAXX-PK

APL/ASCII Dual

ALT CHAR SET,

This option provides an APL alternate character

and STD/ALT
CHARACTER SET

the LA36.

Character Set

the logic, cables, and mounting hardware required to expand the LA36 to include options
LAXX-LA, LAXX-KV, LAXX-KW, LAXX-KX,
LAXX-KY, and LAXX-PK.

CHAR SET LOCK,

set for use with the standard character set in

Indicators

LAXX-LA

Auto LF After CR

When the AUTO LF switch is activated, the
printer will automatically insert a line feed after
each carriage return code typed during transmission. The LAXX-LA option can also be
configured to execute a line feed after each
received carriage return code. Any combination

AUTO LF

of these options can be used.

1-1

LA36 Options (Cont)
Control
Options
LAXX-KV

Name

Switch/Indicator

Description

Top of Forms

FORMS LENGTH

Controls mounted under the top cover provide

Control

Switch and SET TOP

the operator with a method of selecting the

OF FORM Push-

length

button

desired setting is selected and the paper is lined

the

paper to

used.

After the

up for proper vertical alignment, the operator
presses the SET TOP OF FORM switch so that

the internal logic will be preset to the paper
length defined by the operator.

LAXX-KW

LAXX-KX

Selective

DEVICE SELECT

The

Addressing

and SELECT AVAIL

LA36 to communicate with other terminals on

Lamps

a single data communications channel.

Auto Answerback

HERE IS, AUTO LF

and Auto LF

Selective

Addressing Option

allows

the

The Automatic Answerback Option allows the
terminal to transmit a preprogrammed message

Options

of 20 characters

(maximum). The message is

initiated by pressing the HERE IS pushbutton,

or upon receipt of the ENQ control code from

another device. The LAXX-KX also incorpo-

rates

the

features

the

Auto

option

(LAXX-LA).
LAXX-KY

Forms Control and

Keyboard Keys

The

Forms

and

Tabbing

set

horizontal

Option enables the

Vertical and Hori-

terminal

zontal Tabs

positions either locally or via the system soft-

and

vertical

tab

ware. This option also incorporates features of
the

Top

Forms

option

(LAXX-KV)

and

operates in the same manner.

LAXX-LG

EIA/CCITT

None

The LAXX-LG interface provides the user with

Interface

an RS/232-C interface with modem control and

includes a 9-ft (3.54-m) cable terminated with a
standard EIA connector.

LAXX-KH

DF11 Mounting

None

The DF11

Kit

mount

Mounting Kit enables the user to

one

the

DIGITAL

series

DF11

communication options in the LA36.

LAXX-KJ

Compressed Font

None

The Compressed Font Option is a mechanical

Option

option that provides the LA36 with the ability
to

132

columns

form

8-1/2

in.

(21.59-cm) wide.
LAXX-KE

14-Key Numeric

Keyboard Keys

Keypad

The 14-key numeric keypad is located to the
right of the keyboard and provides the operator
with a convenient method of entering mathematical number sequences.

1-2

LA36 Options (Cont)
Control

Options

Name

LAXX-KZ

Paper Out

Description

Switch/Indicator

Provides a visual indication for a paper-out condition. Prevents keyboard and received data

PAPER OUT
Lamp

from printing.

LAXX-LC

LAXX-LH

TTL to CCITT

(V28) Converter
and Modem Protector

Current Loop

The TTL to CCITT (Vv28) Converter and

None

Modem Protector is a BPO DATEL services
interface that meets the requirements of CCITT
(V28) with BPO-required modem protection

circuitry.

None

20 mA current loop with Mate-N-Lok.

None

20 mA current loop with 4-pin plug for DEC10.

Cable

LAXX-LK

Current Loop
Cable

LAXX-KG

EIA Interface

None

The LAXX-LG interface includes a 9-ft (3.54-m)

LAXX-LN

Scale, Pointer,

Column scale,

Operator convenience items that assist in posi-

cable terminated with a standard EIA connector
(no modem control features).

and Window

Line Indicator, and

tioning the print head on preprinted forms and

Kit

Column Pointer

in locating horizontal tabs.

LA36 DECwriter MODEL VARIATIONS

The LA36 variations and associated model numbers are listed below.
LA36-CE

LA36-CF
LA36-CH
LA36-CJ

LA36-DE
LA36-DF
LA36-DH
LA36-DJ

LA36 with Numeric Pad and Paper Out
LA36 with Numeric Pad and Paper Out
LA36 with Numeric Pad and Paper Out
LA36 with Numeric Pad and Paper Out

60 Hz, 90-132 V
60 Hz, 180—-264 V
50 Hz, 90-132 V
50 Hz, 180—264 V

LA36
LA36
LA36
LA36

60 Hz, 90-132 V
60 Hz, 180—264 V
50 Hz, 90—-132 V
50 Hz, 180—-264 V

LA36 JUMPER CONFIGURATIONS

active, half-duplex active, or half-duplex passive, jumpers

LA36 Optional Current Loop Configuration
The LA36 is normally configured for full-duplex passive
operation. To modify this configuration for full-duplex

writer 11 Maintenance Manual.

on the logic board must be changed. For a detailed
description of these jumper modifications and the
associated cabling required, refer to the LA36 DEC-

1-3

LA36 Parity

Continuous-feed, fan-fold business forms with 3-

The LA36 is normally configured with no parity, 8th bit

or 4-prong margin crimps on both margins (multi-

marking on transmit, and no parity error printout. To

part) are recommended. Stapled forms are not

modify this configuration for 8th bit on transmit or odd

recommended and may damage tractors and other

or even parity with or without error printout, jumpers

areas of the machine. Dot or line glue margins are

on the

acceptable (if line is on one margin only). Do not

logic board must be changed. For a detailed

description of these jumper modifications, refer to the

line glue both margins as air will not be able to

LA36 DECwriter |1 Maintenance Manual.

escape and poor impressions will result.

LA36 Speaker (Bell) Volume
The LA36 can be configured for a lower speaker volume
by removing a jumper. For a description of this jumper

Keyboard

modification, refer to the LA36 DECwriter || Mainte-

Standard ANSI keyboard layout

nance Manual.

Multikey roll-over

Interface

LA36 SPECIFICATIONS

Integrated 20 mA current loop, with standard or DEC10

cable or EIA/CCITT interface.

Printing

Switch

selectable:

10,

15,

characters/second

Ribbon

throughput

DIGITAL-specified nylon fabric (Part No. 36-10558)

Spool

Line Length

assembly:

0.5

in.

(1.27

cm)

wide X

40 vyd

(36.58 m) long

132 characters maximum

Power

Spacing

90—132 Vac or 180—264 Vac

10 characters/in. (horizontal)

950 0or60 Hz+ 1 Hz

6 lines/in. (vertical)

300 W maximum (printing)
160 W maximum (idle)

Characters

96 upper/lower case ASCI|

Temperature

7 X 7 dot matrix (0.07 X 0.10in.) (1.77 X 2.54 mm)

Operating

10° to 40° C (50° to 104° F), noncondensing

Paper

Nonoperating

Variable width: 3 to 14-7/8 in. (7.62 to 37.78 cm)

-40° to 66° C (-40° to 151° F) nonoperating,

Single-Part:

noncondensing

15 Ib paper minimum

Card

stock

thickness

of 0.010

in.

(0.25

mm)

Relative Humidity

maximum

Operating
10 to 90% with a maximum wet bulb temperature

of 28° C (82° F) and a minimum dew point of 2°
C (36° F), noncondensing

Multipart:

2- to 6-part (see Notes)

Nonoperating

Thickness of 0.020 in. (0.50 mm) maximum

Tractor-drive, pin-feed

5 to 95%
Dimensions

NOTES
1.

Multipart forms may have only one card part. The

27.5 in. (69.85 cm) wide

card must be the last part.

33.5 in. (85.09 cm) high
24.0 in. (60.69 cm) deep

NCR or 3M paper, up to 6-part, must use ribbon
on top copy.

First surface impact paper is

not

Weight

recommended.

102 1b (46.36 kg)

1-4

LA36 OPERATOR’'S GUIDE

POWER

OFF

BACK
geace - SPEML

f—— MODE ~———ef— BAUD RATE ——f
‘?~¥50 ~;}

LIRE

DELETE‘

FEED
LIKE
LitCe

ALT
CHER

. SET

Fox

HDX®

110

300

LHAR
SET
LOCK

AUTE

HERE

RETURNK
{

REREAT

ALT.
STD.
CHARACTER 5ET

PAPER
DUT

DEVICE SELECT
SELECT AVAIL

7622-28

LA36 OPERATOR CONTROLS AND INDICATORS
NOTE

Dot on switch

indicates function of switch when

depressed.

POWER ON/OFF Switch

The POWER ON/OFF switch connects and disconnects

the line voltage to the LA36 DECwriter Il. The POWER
switch should be in the ON position for normal unit
operation. When changing paper, ribbon, or adjusting the
print head, the switch should be turned OFF.

FDX/HDX Switch

The FDX/HDX switch controls the printing of trans-

mitted keyboard characters. When in the FDX position,
characters typed on the keyboard are transmitted; only
received characters are printed. When in the HDX
position, keyboard characters are both transmitted and
printed; received characters are also printed. The operator should not attempt to transmit data when receiving
data in the HDX mode.
BAUD RATE Switches

The BAUD RATE switches select the rate at which
characters are transmitted and received over the communication line.

LINE/LOC Switch

The LINE/LOC switch is a 2-position operator control
switch. When in the LINE position, the LA36 is enabled
to transmit and receive data. When in the LOC position,
the LA36 receive/transmit lines are disabled and only
local operation can be performed.

Switch

110
300
110 and

300

Character Rate

10 (characters/second)
30 (characters/second)
15 (characters/second)

POWER

OFF

%!'

ON
BACK
SPACE

}--mms-~k—smmgme~4

LINE

FOX
Loxs

ET..

Lotk

CHAR
SET

BREAK

110

300

AUTO
LF

HERE

LIRE FEED

DELETE

RETURM

b
REPEAT

B0
ALT.
CHARACTER SET

PAPER
QUT

DEVICE SELECT
SELECT AVAIL

7622-28

ALT CHAR SET Switch

is installed and the AUTO LF switch is enabled, a LF

When an alternate character set is

installed, the ALT

control

CHAR SET switch allows the operator to select either
the standard

ASCII

character set (switch up)

code will

be transmitted each time a carriage

return code is transmitted.

or the

alternate character set (switch down).

HERE IS Switch
The HERE IS switch is an optional operator control that

CHAR SET LOCK Switch

is inoperative unless option LAXX-KX is installed in the

The CHAR SET LOCK switch allows the operator to

LA36. When the LAXX-KX is installed, depressing the

select manual (switch down) or automatic (switch up)

HERE

character set switching.

grammed message to be transmitted.

transmitting

change

device

can

issuing the character

codes

the

automatic mode, the
the

Switch

character

set

ASCII|

character set.

The Switch

switch

will

cause

20-character

prepro-

(control-O) or

PAPER OUT Indicator

Switch Out (control-N). The Switch In code selects the
standard

When illuminated, the PAPER OUT indicator gives a

Out code

visual indication that the LA36 is out of paper. Printing

selects the alternate character set. In the manual mode,

stops when the out of paper condition is detected.

the character set is selected by the ALT CHAR SET
control switch.

DEVICE SELECT Indicator
The DEVICE SELECT indicator, when illuminated, gives

STD/ALT CHARACTER SET Indicators
The
visual

STD/ALT
indication

alternate

a visual indication that the LA36 has been selected as
a

CHARACTER SET indicators

give a

of the selected character set.

If no

mitting

STD

Selective Addressing option LAXX-KW is installed in the

character

set

option

installed,

the

slave terminal and can transmit data back to the trans-

indicator will always be illuminated when power is on.

unit.

This

indicator

only

operative when

LA36.

SELECT AVALIL Indicator
AUTO LF Switch

The SELECT AVAIL indicator gives a visual indication

The AUTO

that the data communication channel is available and

that

LF switch is an optional operator control

inoperative

wunless

option

LAXX-LA

that the LA36 has the ability to initiate data transmis-

LAXX-KX is installed in the LA36. When either option

sion.

This

indicator

is only operative when Selective

Addressing option LAXX-KW is installed in the LA36.

1-6

POWER
OFF

MODE =

BALK

Ephce o PEA

BAUD RATE =]

F 150 —;

LINE

DfiLETEI

fits

300

AUTO
LF

HERE
i5

RETURK

REPEAT

STD.
ALT.
CHARACTER S5ET

PAPER
OUT

DEVICE SELECT

SELECT

AVAIL

7622-28

SHIFT Key

CTRL Key

The CTRL key
method ~ of

provides the

transmitting

This is a momentary switch which, when depressed,

LA36 operator with a
ASCIl

control

allows selection of uppercase for all printable characters.

codes

(0005 —037g). Holding the CTRL key down and pressing

any

alphanumeric

key

control

standard alphanumeric ASCIl

key

TAB Key

changes the

The printer does not respond to TAB (code 011g) unless

code for that key to a

control code (0005 —03753).

option LAXX-KY is installed.

ESC (SEL) Key

CAPS LOCK Key

The ESC (SEL) key generates code 033g. This provides

The 26 letter keys transmit only upper case when the
CAPS LOCK switch is down. None of the other keys are

the

LA36

generating

affected.

operator

with

command

escape

convenient

method

code sequence. The

printer does not respond to the escape code unless
option LAXX-KY is installed.

1-7

POWER

OFF

’

f—— MODE

ON
BACK
SPAGE

e BAUD RATE —]
:

LINE

LoCs

LINE
fresi

200

ALY
CHAR

BREAR

;—?50—}

AUTO

SET

CTRL

HERE
15

CARS

LOCK

- DELETE

RETURN

REPEAT

STD.
ALT.
CHARACTER 5ET

PAPER
OQUT

DEVICE SELECT
SELECT AVAIL

7622-28

REPEAT Key

The

NOTE

REPEAT key does not generate an ASCIl code.

Rapid paper advance can be obtained by placing the

However, when the REPEAT key is held down and any
key

depressed,

it causes

LA36 in the LOCAL mode and pressing the LINE FEED

the ASCIl code for that

and REPEAT keys.

character to be transmitted and printed at a repetition
rate of approximately

15 characters/second (until the

BACKSPACE Key

key is released).

The BACKSPACE key generates code 010g. The printer
control logic causes the print head to move one position

RETURN Key
The

RETURN

to the left each time a BACKSPACE code is received,

key generates code 015g. The

until the print head reaches the left-hand margin.

printer

control logic causes the print head to be repositioned to

the

left-hand

margin

each

time

the

carriage

return

character code is received. If a line feed (LF) character

DELETE Key

code

The DELETE key generates code 177g. The printer does

follows the

carriage

return

code, the

line feed

not respond to the delete code.

operation is executed simultaneously with the carriage

return. With options LAXX-LA or LAXX-KX installed,

the capability of adding a line feed command after the

BREAK Key

carriage return is included.

The BREAK key is provided for users that utilize the

LINE FEED Key

half-duplex

mode

allows the

LA36 operator to interrupt incoming data

of transmission.

The

BREAK

key

flow by forcing the communication line from a mark

The LINE FEED key generates code 012g. The printer

mode into the space mode

will advance the paper one line each time the LF code is

released). If the LAXX-LG EIA interface is installed, a

received.

short space (230 ms) will be generated.

1-8

(until the

BREAK key is

Carriage Adjustment Lever
The Carriage Adjustment lever controls the print head
gap for single-part or multipart forms.

CARRIAGE
ADJUSTMENT

HEVER

7666-16

Paper Advance Knob

The Paper Advance knob pushes in to disengage the line
feed

gear

train,

allowing fine

vertical

adjustment of

paper position. Coarse vertical adjustment is achieved by
simply turning the knob. Each detent turned represents
one line.
PUSH IN HERE
AND TURN TO

ADJUST PAPER
VERTICALLY

PAPER
ADVANCE

KNOB

7595-4

Tractor Adjust Knob
The Tractor Adjust knob allows fine horizontal adjustment of forms.

“TRACTOR

7595-7

Numeric Keypad

The numeric keypad enables numbers to be entered in
an adding machine fashion.

Each

keypad

ASCIIl

generates

the

same

key in the numeric

character

as the

corresponding key in the main keyboard. The ENTER
key corresponds to the RETURN key.

Bell

The bell indicates that a bell code was received, or that
the print head has reached column 64,

USING THE LA36

Select character set (ALT CHAR SET and CHAR
SET LOCK switches), if applicable.

Select AUTO LF, if applicable.

Select desired baud rate (BAUD RATE switches).

Set the LINE/LOC switch to LINE.

The

LA36 is now on-line and ready to receive and

These steps are all that may be required to place your
LA36 on-line:

Load paper (described in Section 3).

Set LINE/LOC switch to LOC.

Set POWER ON/OFF switch to ON.

Select
switch).

full-duplex

half-duplex

(FDX/HDX

transmit data.

LA36 INSTALLATION AND CHECKOUT GUIDE

GENERAL INSTALLATION INFORMATION
This section
unpacking

CAUTION

contains the step-by-step procedures for

Before connecting the LA36 to a power source,

and unit checkout to ensure that the unit

ensure

was not damaged during shipment and that the unit is

operating

properly

prior to

connection

the

that the

line

voltage and frequency are

compatible with the power requirements of the

com-

machine. Ensure that the POWER switch on the

munication system.

console is OFF.

The LA36 DECwriter Il should be installed in an area

Connect the

that is free of excessive dust, dirt, corrosive fumes, and

receptacle; press the control panel POWER switch

vapors. To ensure that the unit has proper ventilation

to the ON position. The print head automatically

and cooling, the ventilation openings on the side of the

positions itself to the left margin.

cabinet

should

not be

obstructed.

LA36 line cord to the correct wall

A minimum 4-in.

clearance between units must be maintained at all times.

Set the

Adequate service clearance must also be provided for

switch to LOC.

baud

rate to 300 and the

LINE/LOC

servicing the unit. (Refer to the figure on the following

page.)

Press the LINE FEED key, hold down the CTRL
key, and then press the BELL key. The stepping
motor will advance the paper one line and the bell

UNPACKING AND REPACKING
Unpack the

LA36 as described in Section 3. If it be-

comes necessary to ship the LA36 to another site, refer
to the repacking procedure described in Section 3.

tone will sound. Type a line of characters. When

the print head passes the 64th character position,

the bell tone will sound.

Press the BACKSPACE key. The print head will
move one character position to the left.

CHECKOUT AND ACCEPTANCE PROCEDURES

After

Perform the following procedure. If the desired results

RETURN key and observe the return of the print

are not achieved, refer to the troubleshooting guide in

head to the “home”’ position.

132

characters

have

printed,

press

the

Section 3.

Install ribbon per ribbon installation procedure

Set

the

BAUD

RATE switches

to the setting

prescribed for the operating system.

(Section 3).
NOTE
2.

Install paper per paper loading procedure (Section

Both the 110 and 300 BAUD RATE switches must

3).

be depressed to obtain a baud rate of 150.

24"
[

[ O

27.5" —&

}

\I‘

(696 mm)

P———

(33.5")

(852mm)

L_____zs.o'_______

21.7"
(551mm)

1.5"
(38mm)

(635mm)

T
/

AREA

[—E—>
[~ —

a)»—/\i)"\/_

»——;\-l

—
o

DIMENSIONS

A|lB|c|DI|E|F

INCHES

335(275|

(24|

*| 96

MILLIMETERS

|852|696|356|610|

* [2440

* CURRENT LOOP CABLE (BCO5F) LENGTH
IS 15 FT ; EIA CABLE LENGTH IS

9 FT

(2744mm)

AREA
CP-2023

LA36 Site Considerations

CONTROLS AND INDICATORS FOR LA36 OPTIONS

The following options include additional controls not

before the Last Character Visibility shift, the red

present on basic LA36 DECwriters.

line after the shift.

FORMS CONTROL OPTION (LAXX-KV)

ACOUSTICAL COUPLER OPTION (LAXX-LM)

This option requires the addition of a top-of-form con-

There is a single indicator associated with this option.

trol assembly, which is installed beneath the top cover

This red indicator is mounted on the right side of the

on the print head chassis. There are two controls on this

cover and lights when the telephone handset is properly

assembly: SET TOP OF FORM and FORM LENGTH

inserted in the muff assembly and a carrier is detected

(Figure 1).

by the coupler circuitry.

SET TOP OF FORM is a pushbutton that clears
the previously loaded form length and loads the

current setting of the FORM LENGTH switch.
®

FORM

LENGTH

isa

12-position

rotary switch

that is used to preset a form length (in inches) into
the Forms Control.
FORMS CONTROL, VERTICAL TABULATION, AND

SINGLE LINE

HORIZONTAL TABULATION OPTION (LAXX-KY)
This option also utilizes the top-of-form control assem-

bly (Figure 1).

option

contains three indicators:

FORM LENGTH

SCALE, POINTER, AND WINDOW OPTION (LAXX-LN)
This

(INCHES)

Column Scale,

Line Indicator, and Column Pointer as shown in Figure 2.
7622-4

The column scale is a 17.25-in. long strip that is
marked off in 132 divisions representing the pos-

Figure 1

sible column locations. The column scale adheres

Forms Control Assembly

to the plastic print window.
The /ine indicator mounts on the print head and is

used

establish

two

printing

locations.” The

longer top surface indicates the

baseline of the

POSITION OF

NEXT CHARACTER
TO BE PRINTED

characters in a particular line. When setting up a

form or rolling back to a previously printed line,

CHARACTER
BASELINE

this top surface is used to exactly align where the
next character will print. The smaller surface on
the right side indicates the position where the next

character

will

print. This position

- GREEN

RED

is valid only

after the Last Character Visibility shift. The line

COLUMN
/ POINTER

S
>

SPACER

indicator is also included in the APL/ASCII Dual

(IF NEEDED)

Character Set Option (LAXX-PK).
LINE INDICATOR

The column indicator is used in conjunction with

CP-2099

the column scale. There are red and green indicator lines on the column indicator to indicate the

Figure 2

next column to be printed. The green line is used

1-14

Line Indicator and Column Pointer

SETUP AND OPERATING PROCEDURES FOR LA36 OPTIONS
LA36 options requiring setup or operating instructions
in addition to those instructions given for the basic
LA36 are presented in the following paragraphs.
NOTE

Throughout the operating and checkout procedures, the

Control Key (CTRL) and Escape Key (ESC) are used in

conjunction with both alpha and numeric keys to enter
commands into the DECwriter. When a procedure
requires typing a command, the operator should depress
and hold the command key and then depress either the
alpha or numeric key.

character set using the ALT CHAR SET switch. In the
up position, the ALT CHAR SET switch selects the
ASCII character set: in the down position, the alternate
APL character set is selected. Illumination of the CHARACTER SET lamps indicates which character set the
LA36 will print. The STD lamp illuminates for the
ASCII set and the ALT lamp for the APL character set.

Keyboard location of the alternate APL characters IS
shown in Figure 3. The standard ASCII characters are
shown on top of the keys, and the APL symbols are on
the front of the key caps.

Figure 4 shows the bit assignments for both character

APL OPTION (LAXX-PK)

sets.

An LA36 DECwriter containing this option can print
either the standard ASCII characters or the alternate
APL characters. The position of the front panel CHAR
SET LOCK switch establishes whether control over

operator-determined
is
switching
set
character
(manually) or computer-determined (by programming).

In the up position, the CHAR SET LOCK switch permits
the transmitting device to change character sets by

sending either a CTRL O (Switch In) or CTRL N
(Switch Out) command. CTRL O (code 0168). selects
the standard ASCII character set; CTRL N (code 0178)
selects the alternate APL set.

When the CHAR SET LOCK switch is in the down posi-

A | Der-

tion, the operator can manually select either available

FORMS CONTROL OPTION (LAXX-KV)

Setup — (The DECwriter is assumed to be deenergized.)

Measure the form to determine its length in inches. Then
remove the top cover from the LA36 as in paper loading
procedures. On the Forms Control panel, set the FORM

LENGTH rotary switch to the number that corresponds,

in inches, to the length of the form (Table 1). Proceed
with the normal loading of the forms. When completed,
use the Paper Advance knob to align the top line of the
form with the print head. (Normally the top lineis 2 or
3 lines below the perforation, but it can be established at
any line on the form.) Close the top cover and energize
the DECwriter. The form length indicated by the FORM
LENGTH switch is automatically entered during the
power-up sequence.

>0~

QOA

I lose

wvion>

T
A \ CO
e
AT C
AN S A A S AR AR A AN B0
A
525
50 A SA AN SR SR S AR
BELL

;

)

CP-2100

Figure 3

Key Caps Locating APL Characters

i0 ’ Y @nlt|>w]-N]A>BX3]DwE3WNIRElLBTS||v—&s/

—0

X=X > | o

=|lol~]ool S

—> S

M=/

M
o
/
~~Coo]lc<|ll]l~|oo=v||l~0—l|~lo1|o=—l2|l=oo~|3l|o)ll4~o|5~ll|6oo|l7l~oo|8o~l|9ol—o~0||~ll1|o—l2~ol]3]|-42S5|V)- l11S0nlo||o0ll10—~1l~c|0a—l1|11o0on|]ll0ow|101l~1|(—0~01o|1o~0lo101lC~l|—~l=1ol|Nl|o|n1—|~T]|n— IV£&yoa£)l-o/
A.=D0Z~]leeos]laMg12R@|||]5-Ool1]A|s|an|l+|lLAlEm=|I]i=oC]Q|m|¢Awl9r]Cm|~l]ol|z|ae|Z<llCTsnaNMlMl|a|]AlZa|mzlA|]YllulallZuo=E=| ]T|z|all4]AAwd|l|l]MF>alllca=oBR|Unlo|m|S|%]~~@l|l|AoS||t<oo=SS| lo0o1o &<oDRN]cI~lASLal1|]AiC|lloAE]|laQeOClluZEo|m2lzuAoD|~|oolnB|ZWRlzE|mN|l]Tme|==dH||AO~l=o@L==<Ml||z{W2MUGMa]oe|eFn[SlmgR||=Cl]]>alAv|l=%ls=So=l&|MS|gml|=l|SvoA Yoo0Tooo M1-=o
gMl@oLPIlOla]0Tl,= a~lyl.eellajeulledli]al=zlx8=l>E|ll2d]le-=l|zISZl.Isl>lzL]|R2|~o~°o—,. ylyov —1 )B|wnl.— oea|X.l~=N]e=|cl)o|lEg. N- l =vy—)—{-o ki
o*

Figure 4

=)£

oy =

you{

Character Sets

1-16

]

a. Standard (ASCII) Character Set

yo—

..m =

fe—

=4 )2

b. Alternate (APL) Character Set

Bit Assignments for ASCII and APL
o

The procedure for setting up the Forms Control Option

when the DECwriter is energized is the same except that
the SET TOP OF FORM pushbutton has to be pressed
after the form length is selected.

— The operator can generate a Form Feed
Operation
command by typing CTRL L. The program-generated

and 0638 remotely. Advance the form to the next

vertical tab and store this location in the same manner.

The number of tabs that can be set is limited by the
number of printable lines on the form used. For
example, an 11-in. deep form could have up to 66
vertical tabs.
Table 1

Form Feed (FF) command is 0148. Upon receipt of a
Form Feed command, the paper will advance to the next

FORM LENGTH Switch Positioning

top-of-form line.

FORM

Form Length

FORM CONTROL PROGRAMMING

(inches)

LENGTH

Printable Lines

3
3.5
4
5.b
6

18
21
24
33
36

Switch Setting | Per Form (Maximum)

NOTES

To avoid losing incoming characters during a form
control operation, fill characters must be added.

3
3.5
4
5.5
6

These nonprinting fill characters (such as NULL or
DELETE) effectively slow up the data input rate
while the printer mechanism is positioning the
form. The best way to determine the required
number of these fill characters is to count the
number of lines from the last line printed to the
bottom of the form and insert this number of fill
characters. In character combinations when the

8
8.5
11
12
14

character buffer is empty before a carriage return,
15 fill characters can be subtracted from the above

number. All fill calculations are made at 300 baud.
For 150 baud, halve the values (round off to the
; 110 baud, use one third
next higher number)for
(round off to the next higher number).

Once a form feed has begun, it cannot be aborted.

the second Form Feed command and skip one full
form length. If the second Form Feed command is
issued with 17 or more lines remaining to the
bottom of the present form, it will be ignored.
Likewise, more than two Form Feed commands
within one form interval will not be recognized.
FORMS CONTROL, VERTICAL TABULATION, AND

during a power-up seguence.

VERTICAL TABULATION PROGRAMMING
NOTES

Similar to the form feeding sequence, the vertical

tabulation action requires fill characters to slow up
the input data while the mechanism is advancing
the form. Use the same rule as before to determine
the number of fill characters.

Setup — This option requires three setup procedures.

— First perform the Forms
Vertical Tabulation Setup
the top-of-form
establishing
after
and,
setup
Control
position, use the LINE FEED key to move the form to
the desired location of the first vertical tab. To store this
line count, type ESC 3 on the keyboard or issue 0338

8
8.5
11
12
14

then 0648 remotely. All tabs are cancelled (cleared)

HORIZONTAL TABULATION OPTION (LAXX-KY)

— Exactly the same as in the
Forms Control Setup
(LAXX-KV).
Option
Forms Control

48
51
66
72
84

To clear all vertical tabs, type ESC 4 or issue codes 0338

If a second Form Feed command is issued within
16 lines from the next top of form, the paper will

not stop at that next top of form, but will execute

If a Vertical Tab command is issued and there are
no tab locations set, typing CTRL K will initiate a
form feed (FF) and advance the paper to the next
top-of-form location.

Once a vertical tab has begun, it cannot be
aborted. If a second Vertical Tab command is
issued within 16 lines from the next vertical tab
stopping position, the paper will not stop at that
next position, but will advance to the second
vertical tab location. If a second Vertical Tab
command is issued with 17 or more lines
remaining in the present advance, it will be

ignored.

Likewise,

commands within

more than two Vertical Tab

horizontal tab location. If a second Horizontal Tab

one

command

issued

remaining

the

tab

interval

will

not be

recognized.

ignored.

Horizontal Tabulation Setup — Before setting horizontal
remotely

advance,

spaces
will

Likewise, more than two Horizontal Tab

commands

tabs, issue a carriage return (either from the keyboard or

with

present

within

one

tab

interval

will not be

recognized.

by code 0158). This ensures that the print

head starts at the left margin. Issue space characters (by

AUTOMATIC LINE FEED OPTION (LAXX-LA)

keyboard space bar or by code 0408) until the print

The Auto Line Feed action is controlled by the setting

head is positioned at the desired horizontal tab location.

of the front panel AUTO LF switch and the presence of

To store this location, type ESC 1 or issue codes 0338

jumper W1 on the auto line feed assembly circuit board.

then 0618.

Table 2 shows the various conditions that produce the
specified

number of line feeds when

line mode of

operation.

NOTE
Typing ESC 1 moves the print head one character position.

Table 2
Auto Line Feed Setup

Then

space

the

head

the

next desired

tab

location and store this location in the same manner. The

Position of

N.umber of

AUTOLF | Jumper W1 |
)
Switch

number of horizontal tabs that can be set is limited by

Initiating | _Line Feeds
)
Action

In or Qut

Transmitted
or Received

the available number of print columns on the form. For
example, a 17-in. wide form can have up to 132 tabs.

Transmit Mode

Striking the TAB key will initiate a horizontal tab move.

To clear all horizontal tabs, type ESC 2 or issue codes

0338

then

0628

remotely.

All

horizontal

tabs

N/A

Type

RETURN

are

cancelled (cleared) during a power-up sequence.

Down

N/A

Type

RETURN

HORIZONTAL TABULATION PROGRAMMING
Receive Mode

NOTES
1.

To ensure against loss of data while the printer

N/A

mechanism is executing horizontal tabs, fill char-

Receive CR

acters are used to effectively slow up incoming

data.

The

number

required

determined

with LF

Receive CR

without LF

multiplying the number of spaces between tabs by

N/A

0.55 (round off to the next higher number) or by

Out

Receive CR

using 12, whichever is greater. The 12 fill char-

with LF

acters are needed to compensate for the maximum

Receive CR

carriage return time.

without LF

instances where the tab

does not follow a carriage return, only 0.55 times
the number of spaces are needed for fills. All fill

When operated in the receive mode with W1 not cut out,

calculations are made at 300 baud. For 150 baud,

the

halve the

the next higher

command after each Carriage Return command received.

number); for 110 baud, use one third (round off

This is a convenience for existing programs that do not

value

(round

off to

normally

to the next higher number).

If a Horizontal Tab command is received and there
are

tab

locations

set,

the

head

will

advance to column 132 and remain there until a

Once a

have

will

Line

issued within 16 spaces from the next horizontal

Feed

after

insert a

Line

Feed

Carriage

Return
of the

Line

Feed command, cut jumper W1

located on the

Automatic Line Feed Option circuit board.

AUTOMATIC LINE FEED PROGRAMMING

horizontal tab has begun, it cannot be

aborted. If a second Horizontal Tab command is

automatically

command. To disable this automatic insertion

carriage return is received.

DECwriter

NOTES
1.

If jumper W1 is not cut and the received program

already transmits a line feed after each carriage

tab stopping position, the head will not stop at

return, a second line feed action will be performed

that next position, but will advance to the second

by the printer.

With jumper W1 inserted, a nonprinting, nonspacing fill character must be sent after each
carriage return. An idle (marking) line time of one

character is required after each carriage return to
ensure no loss of data during the mechanical
action of the printer.

SELECTIVE ADDRESSING OPTION (LAXX-KW)

The Selective Addressing Option has two 7-bit DIP
switches mounted on the logic board as shown in Figure
6. One switch establishes the unigue address code; the
other the group address. These codes are entered by
positioning the seven slide switches as shown in the
example of Figure 6.

AUTOMATIC ANSWERBACK OPTION (LAXX-KX)
The Auto Answerback Option provides for up to 20
programmable character locations. This stored message is

printed out when in local mode and either the front

panel HERE IS switch is pressed or an ENQ (0058)
command is received.

Under the 7-bit code, a practical limit of 123 devices
may be interrogated, since the selection command codes

(CTRL D, CTRL E, CTRL B, CTRL C, and CTRL F)
should not be used as addresses. However, it may be
advisable to set the limit to 96 devices, as the 32 ASClI

control codes may cause other undesired systems opera-

The message is stored in twenty 7-bit slide switches
located on the Auto Answerback board as shown in
Figure 5. The 7-bit ASCII code for the letter “a'"’ is also
shown. Slide switch No. 1 corresponds to bit 1 and the
ON position corresponds to an asserted (high) logic
state.

Any legitimate ASCII character can be included in the
answerback message, including commands, alpha, or
numeric characters.

tion. When group selecting, there is no limit to the
number of terminals that may be in the group.

When the Selective Address Option is installed in an

LA36 and the terminal is connected into a multipoint
communications network, there are four classes of
master/slave operation. There are three slave states and
one master state, as follows:

time. As master, the terminal can communicate

NOTES

with all the other terminals (designated as slaves)

Spaces are counted as characters.

Messages shorter than 20 characters can be terminated by making the last character a NUL
AIll

(0000000).

remaining

characters

are

in the network.

disregarded. A full 20-character message does not

The Automatic Answerback Option also contains the
operational features of the Automatic Line Feed Option
(LAXX-LA). The position of the front panel AUTO LF
switch determines the insertion of a line feed after a
carriage return. The Auto Answerback circuit board

can be cut out to eliminate certain operations of the
function.

feed

The

possible

jumper

Action

Jumpers

Add LF to

In
In
Out
Out

In
Out
In
Out

— When addressed by the
Group Select Slav
address entered into the
group
the
master using
the option board, a
on
switch
Group Select

network.

configurations are:

terminals in the network to receive data trans-

particular group of terminals can receive data sent
by the master. Terminals not having this particular
group address do not receive data even though
they are within the same communications

contains two factory-installed jumpers (Figure 16) that
line

— A condition that allows all
Broadcast Slave
mitted by the master.

require a NUL at the end.

quto

Master — Any terminal in the network can be the

master, but only one terminal is master at any one

Insert LF After

|Received CR | Keyboard Typed CR
Yes
Yes
No
No

Yes
No
Yes
No

Unique Select Slave — Each terminal can have a

unique address which is different from its group
address code. When addressed using this unique
code by a master, it is possible to establish 2-way

communication between these two terminals and
no other terminals in the network. Also, this
uniquely selected terminal can be inhibited from

transmitting by the master.

Figure 5

Location of 20 Answerback Message Characters

1-20

Figure 6

Location of Address Setting Switches

1-21

MASTER
TERMINAL

BROADCAST
GROUP SLAVES

SLAVES

(ALL 6)

(1,2,83)
UNIQUE SLAVE

(JUST # 3)

SLAVE TERMINALS

Figure 7

Cp-2188

Typical Selective Addressing Communications
Network

Figure 7 depicts a communications network of seven

CTRL G (BELL) — Used to select all terminals to

terminals. It is assumed that terminal A is the master and

receive simultaneously (broadcast mode). Until a

the other six are slaves, each with

a unique address;

CTRL B has been received, the BELL code does

terminals 1, 2, and 3 have the same group address while

not cause the bell on the printer to sound.

4, 5, and 6 have a different group address. When the

master (A) transmits in broadcast, all terminals print the

CTRL B (STX) — Used to “lock’ all terminals in

transmission. When the master addresses the three having

their selected or unselected mode and to prevent

the same group address, only these three receive the

transmitted data. The master can also use the unique

mission. No terminal begins to print until CTRL B

unintentional

selection

during

data

trans-

address of one of the six to establish communication

while the other five disregard all transmission between

before the CTRL B

these two. In addition, the master can address multiple

enabled for transmission, thus allowing a 2-way

unique addresses to form other groups (i.e., terminals 1,

communication.

received.

The

terminal

uniquely

command has

addressed

its keyboard

3, and 6 can be grouped to receive the same data if the
CTRL

master sequentially addresses these terminals).

(ENQ) —Only

used

with

uniquely

selected slave terminals (has no effect on broadcast

Slave terminals operate in either the address mode or

and

data mode, In the address mode, terminals respond to

selected slave terminal

character combinations that make up their broadcast,

Option (LAXX-KX) installed and receives a CTRL

group

selected

slaves).

When

uniquely

has an Auto Answerback

unique, or group addresses. In the data mode, they do

E, the stored answerback message is sent back to

not

the

the master terminal. This allows verification that

acknowledge

address

present

their

addresses,

even

though

the communications

The

the correct slave terminal is being addressed. The

master terminal establishes whether the slave terminals

answerback message is transmitted after the EIA

are in one mode or the other.

interface CLEAR TO SEND signal goes high.

line.

The following six commands are generated at the master
terminal

and

control the operation

CTRL

of the communi-

cations network.

slave.

transmitting

can

also

capability

Normally

wused
of

uniquely

disable

uniquely

selected

the

selected

slave

can

CTRL SPACE (NUL) — Used after a terminal has

transmit back to the master but it can be disabled

become master to reset all slave terminals to their

address

unique address,

mode,

This

action

occurs

before

the

following

commands

CTRL

command except CTRL B.

master sends addresses down the line.

1-22

from

the

master:

E, then any character or

NOTE

On a multipoint network using modems, only one
slave can be allowed to transmit. Therefore, when
uniquely selecting a slave terminal, a CTRL E
should follow each address, leaving only the last

Group

Type group address.
Type CTRL B.

Send message — All terminals in group receive but
cannot transmit.

Type CTRL D at the end of a message.

terminal selected able to transmit.

In the case of multiple selections where it is
desirable to have only the master transmitting, the
last terminal selected should be followed by a
nonvalid dummy address (i.e., unique address;
CTRL E:dummy address; CTRL B). This leaves all

Unique Select (2-way)
Type Unique Address.
Type CTRL E.
Type CTRL B.

slaves transmit-disabled.

CTRL C (ETX) — Upon receiving CTRL C, all
slave terminals switch from the data mode to the
address mode and terminal selection can take
place. This allows a master to select additional

Send

message — Both

slave

can

transmit and receive.

Unique Select (1-way)
Type unigue address.

normal selection rules apply, with the sequence
terminating with CTRL B to lock all devices into
either the selected or unselected modes.

Type CTRL B.

Type CTRL E.

addressing additional terminals, the

CTRL D (EOT) — Used to reset all terminals on
the line so that none are selected. When CTRL D is
typed at the end of the master’s transmission, the
control over the network is removed from the
master and any terminal can become master. It is
also used to select a terminal as the master
anytime the SELECT AVAIL light is illuminated.

and

Type CTRL D at the end of a message.

the lines or
devices without having to surrender
stations. To
selected
y
having to readdress previousl

continue

master

Type any character other than a valid address.
Send message — Slave can receive but not transmit.
Type CTRL D at the end of a message.

Select (add-on)

To add other terminals to terminals already selected
without having to readdress all terminals, perform the
following:

Type CTRL C.

Type new address or addresses.
Type CTRL B.
Send message.

Type CTRL D at the end of a message.

A terminal becomes master and places the slaves in

SELECTIVE ADDRESSING PROGRAMMING

address mode by performing the following sequence:

NOTES

Power-up.

Master and all slaves in full duplex mode.
Front panel SELECT AVAIL light on.

Anytime more than one terminal is uniquely
selected, a CTRL E command should follow each

unique address. The last address in the sequence
does not have to be followed by a CTRL E if this
terminal is to remain transmit-enabled. Refer to
the description of the CTRL E command.

Type CTRL D.

Wait for DEVICE SELECT light to illuminate.
Type CTRL SPACE.

After becoming master, this terminal can establish the

Ensure that a CTRL D command follows the end
of all transmitted messages. This relinquishes
control of the network by the master and allows

type of slaves in the network as follows:

Broadcast

other terminals to become master.

Type CTRL G.
Type CTRL B.

In applications where the EIA signal CLEAR to
SEND is always high, the command CTRL SPACE

Send message — All terminals receive but cannot
transmit.

is not required.

Type CTRL D at the end of a message.

1-23

ACOUSTICAL COUPLER OPTION (LAXX-LM)
Setup
— The following conditions must be met before
using the acoustical coupler: printer power on, on-line,
baud rate matched to sending system. Call the number

of the sending system and listen for the carrier sound

(loud whistle). After receipt of carrier, place the handset
into

the

acoustical

coupler

muff

assembly

with

the

phone cord end of the handset inserted into the muff
with the “‘dot” and/or word “CORD’’ next to it. Within
5 seconds, the carrier light illuminates. Normal system
operation may now commence,

NOTE

Before removing the telephone handset from the muff
assembly, place the DECwriter in the local mode. This

action

prevents

the

disconnect

noise

from

causing

printing of random characters.

1-24

INSTALLATION AND CHECKOUT OF LA36 OPTION KITS

INTRODUCTION

Place a grommet (3) over each stud that sticks up

Figure 8 contains three basic cabling diagrams for the
LA36. These diagrams depict the cabling configurations

through the brackets.

Carefully replace the logic board on top of the

logic board and the Expander
Mounting Option (LAXX-LB) for the various option Kits

between the
available.

M7728

installing

Before

any

grommets

option, it is recom-

mended that these diagrams be consulted

and

secure

with

the six

screws and

associated washers previously removed.

On the option distribution board assembly (Figure
10), remove screw (4) and loosen screw (5) on

to ensure

proper cabling,

each hinge bracket.

EXPANDER OPTION MOUNTING KIT (LAXX-LB)
Expander

The

Option

Mounting

contains

Kit

Squeeze each hinge bracket toward the middle
until the hinge tabs (2) of the side brackets can be

the

inserted into the pivot holes as shown.

following:

Insert the two screws (4) and tighten these screws
Quantity
1

ltem

Part Number

and screws (D).

Option Distribution

10.

Board Assembly

1
1

Right-Hand Side Rail

See

Assembly

D-UA-LAXX-LB-0

rails.
11.

Left-Hand Side Rail
Assembly

Grommets

9007017-00

Interconnecting Cables

C-IA-BC0O8S-1B

Keyboard Cable

C-1A-7008612-4A

+5 Volt Power Cable

C-1A-7010001-8

Lock both % turn fasteners (6) to secure the
option distribution board assembly to the side

Connect the interface cables as shown in Figure 8,
depending upon the options being installed.
CAUTION

The ribbon cables between the logic board and the
expander board must be installed so that one cable
end (either end) has the ribbed side of the cable

A nut driver, Phillips, and straight blade screwdrivers are

facing up and the other end has the smooth side

required to install the Expander Option Mounting Kit.

up. Ensure that A connects to A at each cable end.

Use Figures 8, 9, and 10 and the following procedure as

Failure to observe this polarity may cause a logic

installation guides.

board failure.

Unplug the ac power cord. Remove the paper, top
12.

cover, and plastic housing from the unit.

Unhook all cables from the logic board.

Remove the six screws and washers that secure the

and GND terminals of the power board and the
other cable end to the Faston terminals (7 in
Figure

logic board to the cabinet door and then remove

Recorinect the +5V supply cable (black and red
wires) to the logic board. Connect one end of a
similar cable (supplied with this option) to the +5b

10)

the

option

distribution

board

the logic board. The keyboard cable clamp should

assembly. Route the cable with existing cables to

also be removed from below the logic board.

the power board.
13.

Place the right and left side brackets (1 in Figure

must be removed.

10) over the screw studs as shown. The hinge tabs

of the side brackets (2) should be pointed inward

To connect the front panel control cable, the bezel

14.

Remove the four screws, lock washers, flat washers

toward each other and toward the interior of the

(1 in Figure 9), and spacers (2 in Figure 9) that

cabinet,

secure the keyboard bezel to the cabinet base.

1-25

TO J1
POWER BOARD

20mA SERIAL

TO.J2

INPUT (IF USED)

EIA

(NOT
USED)

KEYBOARD

INPUT
(IF USED)

oo Do L] 2] ]
M7728 LOGIC

A. NO

OPTIONS

BOARD

INSTALLED

TO J1
POWER BOARD

INPUT (IF useo)’—_]

EIA

20mA SERIAL

TO J2
KEYBOARD

INPUT

(IF USED)

wrres
| [T T3] [o2] o] od]

LOGIC BOARD

TO J2 FRONT
f;/g:\%lb CONTROL

EXPANDER MOUNTING

OPTION

(LAXX-LB)

B. ANY OPTION
AND AUTO LINE FEED OR AUTO ANSWER BACK OPTIONS
NOT

INSTALLED

POWER,BOARD

EIA INPUT

20 mA SERIAL

INPUT (IF USED)

(IF USED)

IJ3|
70

IJ1|

IJSI

|J4|

KEYBOARD
M7728

LOGIC BOARD
—

(NOT

|
IJSI

useo

|J3| IJZI

FRONT

PANEL CONTROL

BOARD

|J1I |J4|

EXPANDER

MOUNTING

OPTION

(LAXX-LB)

C. ANY OPTION AND
AUTO LINE FEED OR AUTO ANSWERBACK

OPTIONS

INSTALLED

CP-2i02

Figure 8

Cabling Configurations for Various LA36
Options

1-26

\Y,

2
T

CCIXTTTAN)

@
‘-0

INSULATOR&Y}
WASHER

INSULATOR
WASHER

EXTENDER
BOARD
RED

STRIPE

/%7

<-— 9
CP-2103

Figure 9

Keyboard and Bezel Assembly — Cabling

and Hardware

1-27

TO FRONT
PANEL CONTROL
2

DOOR (DECWRITER II)
REF

TO LOGIC

BOARD (MPC)
CONN

e
5

<&
I

cP-2104

Figure 10 Installation of Expander Mounting Kit
(LAXX-LB)

1-28

—

bubble plastic and remove the four Kep nuts (9

Test After Installation— Load paper and energize the
DECwriter. In local mode, typing will produce printed

Figure

characters.

Turn the bezel upside down on a piece of foam or
9)

assembly

that secure the front panel control
the bezel. Leave the four hex

standoffs in place.

APL OPTION KIT (LAXX-PK)
NOTE

In some instances it may be necessary to remove

the

control assembly can be removed.
16.

The APL Option Kit contains the following:

keyboard assembly before the front panel
Quantity

Item

Part Number

APL/ASCII Dual Char-

D-CS-M7732-0-1

Connect one end of the front panel control cable

to J2 as shown in 10, Figure 9, Ensure that the red

acter Set Board

stripe on the ribbon cable is as indicated.
17.

across the cabinet and down
through the access hole and to J4 (8), Figure 9 on
Feed the cable

the option distribution board assembly. Ensure
that the red stripe on the cable is positioned as

Edge Connector

B-UA-H851-0-0

APL ROM

23086A6

APL ROM

23087A6

Phillips Pan Head

9006011-1

Screws (#34-40
X 0.38 in.)

shown.in Figure 10.
NOTE

18.

1
1

Flat Washers (#4)

9006655

Lock Washers (#4)

9006688

Line Indicator

C-MD-7414953-0-0

APL Keyboard

D-AD-7011055-0-0

If either the APL Option (LAXX-PK), Paper Out
Option (LAXX-KZ), or the 14-Key Numeric Keypad Option (LAXX-KE) is also being installed, the
applicable installation procedure should be consulted before the keyboard bezel is secured back

required tools for installation. Use Figures 9 and 11 plus

onto the cabinet base.

the following procedure as installation guides.

A Phillips screwdriver and a

Replace the front panel control assembly on the

NOTE

standoffs and secure with four Kep nuts. Provide

Unplug the DECwriter and remove paper.

adequate cable clearances around all standoffs.
If

CAUTION

not

already

installed,

install

the

Expander

Option Mounting Kit (LAXX-LB).

Ensure that the insulating washers are inserted
between the Kep nuts and the etch side of the
to
circuit boards as shown in Figure 9. Failure
circuit
cause
may
points
required
at
washers
install

Refer to Figure 8 for the correct interface cabling

required

integrate

the APL Option

into the

existing options.

damage.

19.

11/32-in. nut driver are

Using the supplied hardware (1 in Figure.11) (four

Replace the keyboard bezel on the cabinet base

#4-40 X 0.38-in. screws and #4 washers), secure

and secure with the four screws, lock washers, flat

the

washers, and spacers.

APL

board

in location

F on the expander

board (Figure 11).

CAUTION

The keyboard bezel should be positioned as far
forward as possible to eliminate interference
between the keyboard cable and print head

Install the H851 edge connector (2). (Edge connector and board are keyed for proper fit.)

assembly.

spacers are placed under the

Insert the two APL ROMs: No. 23087A6 in socket

keyboard bezel. Failure to do so may result in

(3) and No. 23086A6 in (4). Refer to Figure 11

damage to the print head because of interference

for Pin No. 1 locations.

Ensure that the

with the keyboard connector.
Remove the cover and top plastic housing from
20.

the DECwriter.

Replace the plastic housing and cover,

1-29

Figure 11

Installation of the APL/ASCI| Dual Character

Set Board

1-30

- CAUTION

Remove the two front screws (5) and associated
washers from the print head, install the line
indicator (6) as shown, and reassemble the

The keyboard cable must be routed to the inside
of standoff (3) and between the bezel and the
component side of the keyboard. This prevents

removed hardware.

possible interference between the cable and print
‘
head assembly.

NOTE

Unless otherwise specified, all following references

NOTE
|
In some instances, it may be necessary to remove

are made to Figure 9.

the control panel board before the keyboard can

Remove the four screws, lock washers, flat washers
(1) and spacers (2) that secure the keyboard bezel
to the cabinet base.

be removed.
15.

Turn the keyboard bezel upside down on a piece
of foam or bubble plastic and remove the four Kep
nuts (3) that secure the keyboard to the bezel.

cable clearances around standoffs.
CAUTION

Leave the four hex standoffs (4) in place.

10.

If required, ensure that the insulating washers are
inserted between the Kep nuts and the etch side of
the circuit boards as shown in Figure 9. Failure to

Carefully lift the keyboard off the weld studs,
disconnect the Berg connector (5) from J2 on the
keyboard, and set the keyboard aside. If the
equipment also uses a numeric keypad, disconnect
the cable connector from J1 (6). On the control
panel board, disconnect the cable from J3 (7).

insert washers at the required points may cause

circuit damage.
16.

13.

CAUTION

The keyboard bezel should be positioned as far
forward toward the operator as possible to eliminate interference between the keyboard cable and

Cut jumper W1. See Figure 9 for location of W1
on the front panel control assembly.

print head assembly.

Replace the front panel control assembly on the

Ensure that the spacers are placed under the
keyboard bezel. Failure to do so may result in
damage to the print head because of interference

standoff and secure with the Kep nuts.
CAUTION

with the keyboard connector.

Ensure that the insulating washers are inserted
between Kep nuts and the etch side of the circuit

17.

board. Failure to install washers at required points

Replace and secure the plastic housing and replace
the cover.

may cause circuit damage.
14.

Replace the keyboard bezel on the cabinet base
and secure with the four screws, lock washers, flat
washers, and spacers.

Pemove the four Kep nuts (9) that secure the
front panel control assembly to the bezel. Leave

the four hex standoffs in place.
12.

Place the new keyboard on the weld studs and
secure it with the four Kep nuts. Provide adequate

Test After Installation — Install paper and apply power.

Reconnect the Berg connector to J2 on the new
keyboard. If required, reconnect the cables at J1
and J3. Ensure that the red stripe on each cable is

In the local mode with both ALT CHAR SET and
CHAR SET LOCK switches down, the DECwriter will
print APL characters as typed.

positioned as shown in Figure 9,

1-31

FORMS CONTROL OPTION KIT (LAXX-KV)

longer leads and smaller connectors connects to
the top-of-form

end

The Forms Control Option Kit contains the following:

the

control assembly and the other

top-of-form

control

module

board.

Connect the two push-on leads to the terminals on
the SET TOP OF FORM switch (3) and plug in the

Quantity

Item

Part Number

8-pin connector as shown.

Top-of-Form Control | D-AD-7011503-0-0

Install the top-of-form control assembly using the

Assembly Board
1

previously removed #8-32 X 3/8-in. screw and #8

Top-of-Form Module | D-CS-M7735-0-1

washers

Board
1

Top-of-Form Cable

D-1A-7011516-0-0

Phillips Pan Head

9006011-1

shown

(2). Then secure the two

(5). Screw in from the outside of the bracket.

Screws (#4-40

Feed the cable under the printer mechanism then

X 3/8in.)
4

#6-32 X 3/8-in. screws and #6 washers as shown in

Phillips Pan Head

down

9006022-1

Screws (# 6-32)
X 3/8in.)
1

Edge Connector

B-UA-H851-0-0

Lock Washers (#4)

9006688

Lock Washers (#6)

9007801

Flat Washers (#4)

9006655

Flat Washers (#6)

9006653

through

the

access

hole

and,

using the

existing cable clamps, conform the cable as shown.
10.

Position the top-of-form control module board (in

location ““B”') on the Expander Option Mounting

Kit. Secure with four #4-40 X 3/8-in. screws and

#4 washers as in (8).
11.

Install the

H851

edge connector (7)

(edge con-

nector and board are keyed for proper fit) and the

8-pin connector (6) and two push-on connectors as
A

Phillips

screwdriver

is the

only

tool

required

shown.

for

installation. Use Figure 12 and the following procedure
as installation guides.
1.

12.

Replace the top cover.

Unplug the ac power cord and open the top cover.
If

not

already

installed,

install

the

Test

Expander

After

Option Mounting Kit (LAXX-LB).

procedure:

Refer to Figure 8 for the correct interface cabling

Installati
— Perform
on

the

following

Energize the DECwriter, load paper, and set the

required to integrate the Forms Option into the

FORM

existing options.

length of the form in inches. Press and release the

LENGTH

switch

correspond to the

SET TOP OF FORM pushbutton.

Unscrew the attaching hardware of the bell
speaker. Save the two #6 flat washers and two

#6-32 X 3/8-in. screws but discard the Kep nuts.

Type any character on the keyboard, then type
CTRL L. The paper should feed and stop at a

Remove and save the bracket hardware (2) (#8-32

distance

that

X 3/8-in. screw, #8 lock washer, #8 flat washer).

setting.

Repeat

equal
this

inches to

procedure

for

the

switch

two

other

switch settings, one longer, the other shorter than

Attach the speaker to the inside of the top-of-form

this

control assembly (1).

pushbutton after changing the setting.

Use four #6-32 X 3/8-in.

setting.

Press

the

SET

TOP

FORM

screws, #6 flat and lock washers and secure from
the inside as in (4).

Set the FORM LENGTH switch to 3 and press the
The

top-of-form

cable

has two

distinct

ends,

SET TOP OF FORM pushbutton. Press the LINE

differing by the length of the wire leads and type

FEED key 17 times, then type CTRL L. The paper

should increment only one line.

push-on connectors. The cable end with the

1-32

OPTION MOUNTING
(LAXX-LB)

F ORM CONTROL
ASSEMBLY BOARD
CP-2106

Figure 12

Installation of Form s Control Option Kit
(LAXX-KV)

1-33

FORMS CONTROL, VERTICAL TABULATION,

Attach the speaker to the inside of the top-of-form

AND HORIZONTAL TABULATION,

control assembly

Option

Kit

Use four #6-32 X 3/8-in.

the inside as in (4).

The Forms Control, Vertical Tabulation, and Horizontal
Tabulation

(1).

screws, #6 flat and lock washers and secure from

OPTION KIT (LAXX-KY)

contains

the

Forms

The

top-of-form

cable

has

two

distinct

ends,

differing by the length of the wire leads and the

Control

Option Kit (LAXX-KV) and the following:

size of the push-on connectors. The cable end with

the longer leads and smaller connectors connects
to the top-of-form control assembly and the other

Quantity

Item

1
1

end to the

Part Number

the

two

HT-VT-TOF

push-on

module board. Connect

leads to the terminals on the

Top-of-Form Control | D-AD-7011503-0-0

bottom of the SET TOP OF FORM pushbutton

Assembly

(3) and plug in the 8-pin connector as shown.

HT-VT-TOF Module | D-CS-M7736-0-1

Install the top-of-form control assembly using the

Board

Top of Form Cable

D-1A-7011516-0-0

previously removed #8-32 X 3/8-in. screw and #8

Phillips Pan Head

9006011-1

washers as shown in

(5). Screw in from the outside of the bracket.

X 3/8in.)
4

(2). Then secure with two

#6-32 X 3/8-in. screws and #6 washers as shown in

Screws (#4-40
Phillips Pan Head

9006022-1

Screws (#6-32

Feed the cable down through the access hole and,

X 3/8in.)

using the existing cable clamps, conform the cable

Edge Connector

B-UA-H851-0-0

Lock Washers (#4)

9006688

Lock Washers (#6)

9007801

Flat Washers (#4)

9006655

Flat Washers (#6)

9006653

as shown.
10.

Position the HT-VT-TOF module board (in locations A and B) on the Expander Option Mounting

Kit. Secure with two #4-40 X 3/8-in. screws and

#4 washers as in (8).
11.

Phillips

screwdriver

Install the H851 edge connector (7) in location A

installation. Use Figure 13 and the following procedure

(edge connector and board are keyed for proper
fit) and the 8-pin connector (6) and two push-on

as installation guides.

connectors as shown.

the

only

tool

required

for

NOTE

Unplug the ac power cord and remove the top

Only one H851 edge connector is needed. Do not

cover.

not

install two connectors.
already

installed,

install

the

Expander

12.

Replace top cover.

Test

After

Option Mounting Kit (LAXX-LB).

Refer to Figure 8 for the correct interface cabling

required to integrate the

Installation

Forms Control Option

into the existing options.

the

attaching

hardware

the

Perform

the

following

Load paper, energize the DECwriter, and set the

FORM

Unscrew

—

procedure:

LENGTH

switch

correspond

the

length of the form in inches. Press and release the

bell

SET TOP OF FORM pushbutton.

speaker. Save the two #6 flat washers and two

#6-32 X 3/8-in. screws but discard the Kep nuts.
Type any character on the keyboard, then type

Remove and save the bracket hardware (2) (#8-32

CTRL

X 3/8-in. screw, #8 lock and flat washers).

distance

1-34

L. The paper should feed and stop at a
that

equal

inches

the

switch

\%
/
EXPANDER OPTION
MOUNTING KIT
(LAXX-LB)

TOP OF FORM
VERTICAL
& HORIZONTAL
TABS ASSEMBLY

BOARD

cpP-2107

Figure 13 Installation of Forms Control, Vertical
Tabulation, and Horizonta! Tabulation Option Kit
(LAXX-KY)

1-35

setting.

Repeat

this

procedure

for

two

other

20.

Type TAB; type “'E.”

21..

Type TAB; type “F.”

switch settings, one longer, the other shorter than
this

setting.

Press

the

SET

TOP

FORM

pushbutton after changing the setting.
22,

Type TAB; the

Set the FORM LENGTH switch to 3, and press the

SET TOP OF FORM pushbutton. Press the LINE

top

FEED key 17 times, then type CTRL L. The paper

23.

ensuring

Control

correct operation

function,

of the

line one character space to the right of the

second line.

should increment only one line.

After

head will move to column 132.

The printed characters will be in two lines with the

Type

Forms

RETURN,

type

TAB

twice,

set the TOF for 11-in. form

paper. (Set switch at 11; press pushbutton.)

24.

Type TAB; type "'G."”"

Type an “A.”’

25,

Type

Type CTRL K; the DECwriter will line feed 11 in.

TAB; type ““H.” The characters ““G"” and

and “F."

Type ESC 2, RETURN, and then TAB. The print

26.
Press the LINE FEED key 10 times, type ESC 3,

head

then type a “C.”

completed.

Type CTRL L. Type a “D.” Manually turn the

will

move

column

132.

The Auto Line Feed Option Kit contains the following:

Type CTRL K, then type an “E’" (will print next

Quantity

Item

Part Number
D-CS-M7738-0-1

Auto Line Feed Board

Type CTRL K, then type an ““F’’ (will print next

Edge Connector

to previously printed ““D"’).

B-UA-H851-0-0

Phillips Pan Head

9006011-1

Screws (#4-40

Type ESC 4, then manually turn the paper back to

X 0.38in.)

the line with "B’ on it.

Type CTRL K;

Lock Washers (#4)

9006688

Flat Washers (#4)

9006655

the print head will align on the line

containing D" and “F.7
13.

test

where “‘B"' was printed.

to previously printed ‘‘C"’).

12.

The

AUTOMATIC LINE FEED OPTION KIT (LAXX-LA)

paper back until the print head aligns at the line

11.

press

“H" will overprint on the previously printed “E"

Type a “B."”

10.

then

BACKSPACE ten times.

Phillips

screwdriver

is the

only

tool

required

for

installation. Use Figure 14 and the following procedure

Type LINE FEED, RETURN, and TAB. The print

as installation guides.

head will move to the right margin (column 132).
|

14.

Type

RETURN, then

press the space

times.

15.

Type ESC 1, then type “A.”

16.

Space eight times; type ESC 1; type “B."”’

Unplug the ac power cord.

bar eight
If

not

already

installed,

install

the

Expander

Option Mounting Kit (LAXX-LB).
3.

Refer to Figure 8 for the correct interface cabling
required to integrate the Auto Line Feed Option

into the existing options.
17.

18.
9.

Space eight times; type ESC 1; type ‘C.”"
Type

Using the supplied hardware (1) (three #4-40 X
0.38-in. screws and #4 washers), secure the Auto

RETURN; type LINE FEED.

Line

Feed

board

locations C and

D on the

expander board. As shown, one of the mounting

Type TAB; type “D."”

holes should not be secured.

1-36

EXPANDER

OPTION MOUNTING
(LAXX-LB)

LINE FEED
AUTOBOARD

NO SCREW

HERE

cpP-2108

Figure 14

Installation of Automatic Line Feed Option
(LAXX-LA)

1-37

Install the two H851 edge connectors (2). Edge

Properly interface the DECwriter with the Selec-

connectors and board are keyed for proper fit.

tive

Addressing

option

another

DECwriter

Test After Installation — Load paper and energize. In the

without this option. (EIA interface or any other

local mode, with the front panel AUTO LF switch in the

type of communications interface is acceptable.)

up position, type RETURN; a carriage return and one

line feed should occur. Press the AUTO LF switch and
type

Energize both terminals; set both to the same baud

RETURN; a carriage return and two line feeds

rate,

should occur.

line

mode,

SELECTIVE ADDRESSING OPTION KIT (LAXX-KW)

The

Selective

Addressing

Option

Kit

contains

the

Quantity

Item

Selective Addressing

Edge Connector Board | B-UA-H851-0-0

Selective Addressing Option is designated as ‘A"’

light is illuminated.

9006401-04

Nylon Screws

(#4-40 X 0.38 in.)

AVAIL

ElA Interface Cable
screwdriver

is the

| C-1A-7010489-0-0

only

tool

required

not

already

installed,

type

integrate

the

type

DEVICE

CTRL

SELECT

The SELECT
lights

will

CTRL

Both

terminals

can

send

type

CTRL

The

DEVICE

and

terminal

SELECT light extinguishes.
install

the

Expander

Type any character on terminal B; it is not printed
by A. The SELECT AVAIL light on terminal A

extinguishes. A cannot send or receive.

Refer to Figure 8 for the correct interface cabling
required

receive.

Option Mounting Kit (LAXX-LB).
3.

and

On terminal A, type CTRL SPACE (NULL), then

for

Unplug the ac power cord.
If

terminal

iIlluminated on terminal A.

as installation guides.

without the option designated

On terminal A, the front panel SELECT AVAIL

| D-CS-M7737-0-1

installation. Use Figure 15 and the following procedure

operating

Part Number

Phillips Pan Head

A Phillips

duplex

NOTE

and the terminal

full

In the following procedure, the terminal with the

following:

and

conditions.

Selective

Addressing

Option into the existing options.

NOTE
Steps 8 and 9 set up terminal A as a broadcast

Using

the supplied

hardware (3)

(two #4-40 X

selected slave.

0.38-in. screws), secure the Selective Addressing
board in location E on the expander board.

On terminal B, type CTRL SPACE, CTRL G, then
type CTRL B. Terminal A can receive from B, but

Install the H851 edge connector (2). Edge connec-

not send.

tor and board are keyed for proper fit.

On terminal B, type CTRL D. On terminal A, the

SELECT AVAIL light illuminates.

If the Selective Addressing Option is to be used
with the EIA

Interface Option (LAXX-LG), the

NOTE

interface cable (1) should be connected as shown

(lug

on the

Steps 10 through 13 set up terminal A as a group

EIA board to lug GND on the

selected slave.

Selective Addressing board).
Test

After

procedure:

Installat
— Perform
ion

the

following

10.

On terminal B, type any characters. The SELECT
AVAIL light on terminal A extinguishes.

1-38

EIA OPTION
(LAXX-LG)

SELECTIVE
ADDRESSING
BOARD

M7728
LOGIC BOARD

OPTION MOUNTING

KIT (LAXX~-LB)

CP-2109

Figure 15

Installation of Selective Addressing
Option Kit (LAXX-KW)

1-39

1.,

12.

On terminal B, type the group select code that was

22.

On terminal B, type any characters. The SELECT

entered into the switches on the Selective Address-

AVAIL

ing circuit board installed in terminal A.

type CTRL B.

terminal

B, type CTRL B. Terminal A can

23.

terminal

A extinguishes. Then

On terminal B, type A’s unique select code. The

receive from B, but not send.

DEVICE SELECT light on A does not illuminate;

then
13.

light

On terminal B, type CTRL D. On A the SELECT

type

CTRL

and

A’s

code

again.

The

DEVICE SELECT light illuminates now.

AVAIL light illuminates.

24,

NOTE
Steps

through

set

up terminal

On terminal B type CTRL B. Both terminals can
send

A as a

uniquely selected slave (case 1).

14.

and

DEVICE
AVAIL

receive.

Then

SELECT

extinguishes

type

CTRL

and

The

SELECT

light illuminates on terminal A.

On terminal B, type any characters. The SELECT
AVAIL light on terminal A extinguishes.

AUTOMATIC ANSWERBACK OPTION KIT
15b.

On terminal B, type A’s unique select code that
was

entered

into

(LAXX-KX)

the switches on the Selective

Addressing circuit board installed in terminal A.

The

Auto

Answerback

Option

Kit

contains

the

following:

16.

terminal

the

DEVICE

SELECT

light

illuminates.
17.

18.

Quantity

On terminal B, type CTRL E, then CTRL B. Both

1
2

Edge Connectors

B-UA-H851-0-0

Option is installed in terminal A, the answerback

Phillips Pan Head

9006011-1

Screw (#4-40
X

typed.

0.38 in.)
4

On terminal B, type CTRL D. On A, the DEVICE
light

extinguishes

and

the

through

set

9006688

Flat Washers (#4)

A Phillips screwdriver

9006655

is the

only

tool

required

for

installation. Use Figure 16 and the following procedure
up terminal

A as a

as installation guides.

uniquely selected slave (case 2).

Repeat steps 14 through 16.

(A’s DEVICE SELECT extinguishes), then CTRL

B. Terminal A can receive but not send.

NOTE

not

already

installed,

install

the

Expander

Refer to Figure 8 for the correct interface cabling
required

integrate

the

Auto

Answerback

Option.

On terminal B, type CTRL D. On terminal A, the

light illuminates.

Unplug the ac power cord.

Option Mounting Kit (LAXX-LB).

On terminal B, type CTRL E, then any character

SELECT AVAIL

Lock Washers (#4)

SELECT

light illuminates.

NOTE

Steps

21.

Auto Answerback Board | D-CS-M7733-0-1

message will print on terminal B after CTRL E is

SELECT

20.

Part Number

terminals can send and receive. If the Answerback

AVAIL

19.

Item

Using the supplied hardware (1)

(four #4-40 X

0.38-in. screws and associated washers), secure the

Steps 22 and 23 set up terminal A as a uniquely

Auto Answerback board in locations C and D on

selected slave (case 3) with add-on capability.

the expander board.

Figure 16

Installation of Automatic Answerback

Option Kit (LAXX-KY)

1-41

Install the two H851 edge connectors (2). Edge

Connect the input end of the EIA cable assembly

to the signal source.

connectors and board are keyed for proper fit.
6.

The EIA circuit board has two wire jumpers that allow

Enter the answerback message using the 7 slide

selection of the type of BREAK and DATA TERMINAL

switches on the 20 character switches. Use the
standard ASCI| code. The ON switch position is

READY signals that are output by the EIA interface.

the asserted state (high) and slide switch No. 1

Depending on the presence of these jumpers, any of the
following four terminal conditions produce the output

corresponds to b1 of the 7-bit character.

signals.

Test After Installation — Install paper and energize. In

Paper Out

the local mode, pressing the front panel HERE IS switch

Switch to Local Mode

institutes a printout of the answerback message. When

Power-up Sequence Not Completed

on-line, a received ENQ command (0055) will generate

Terminal Power Switched Off

the answerback message.

The

In the local mode, with the front panel AUTO LF switch

status

these

jumpers

produce

the

following

outputs for any of the above conditions.

in the up position, type RETURN; a carriage return and
one line feed should occur. Press the AUTO LF switch

EIA Output Signal

and type RETURN; a carriage return and two line feeds
should occur.

EIA INTERFACE OPTION KIT (LAXX-LG)

Item

Out

None

230 ms BREAK on Transmit

Out

Data Line

The EIA Interface Option Kit contains the following:

Quantity

Out

DATA TERMINAL READY
Disconnect

Part Number

EIA Interface Assembly | D-1A-7011828-0-0

Phillips Pan Head

NOTE

The EIA board is shipped with both jumpers installed.
NOTE

9006037-1

The

Screws (#8-32 X

CARRIER

TERMINAL

0.38 in.)

Lock Washers (#8)

9006690-00

| Flat Washers (#8)

9006660-00

DETECT

signal

can

cause

DATA

READY disconnect regardless of jumper

presence.

Test After Installation — Send EIA data into the DECwriter; the printout should verify a correct installation.

A Phillips

screwdriver

is the

only tool

required

for

installation. Use Figure 17 and the following procedure

14-KEY NUMERIC PAD OPTION KIT (LAXX-KE)

as installation guides.

The 14-Key Numeric Pad Kit contains:

Unplug the ac power cord.

Disconnect the 20 mA interface input cable from

Quantity

J3 on the M7728 logic board.
Remove the

two

screws that

hold the 20 mA

Item

Part Number

Bezel

E-1A-7411427-2-0

LKO3A Numeric

C-UA-LKO03-A-0

Keyboard Assembly

interface cover plate to the floor of the cabinet

and remove the complete harness assembly.

Insert the connector end (1) of the EIA interface

Numeric Pad Cable | C-1A-7008612-0-0

Standoff Spacers

900928500

Kep Nuts

9006563-00

cable up through the hole in the floor, then insert

A Phillips screwdriver and a 11/32-in. nut driver are the

the EIA circuit board assembly (2).

only tools required for installation. Use Figure 9 plus the

Using the #8-32 X 0.38-in. screws and washers (3)

following procedure as installation guides.

supplied, secure the EIA assembly.

Plug the connector {1) into J4 of the M7728 logic

Unplug the ac power cord, take the top cover off,
remove the paper, and remove the plastic housing.

board.

1-42

Figure 17

Installation of EIA Interface Option Kit
(LAXX-LG)

1-43

Refer to Figure 9.

Remove the four screws, lock

washers, flat washers

(1),

and

Replace and secure the plastic housing. Replace

spacers (2) that

the cover and install paper.

secure the keyboard bezel to the cabinet base.
Test After

Turn

Installation — Apply power and place it in

the keyboard upside down on a piece of

local mode. The keys on the numeric pad will produce

foam or bubble plastic and remove the four Kep

numeric characters just as if they were typed on the

nuts (3) that secure the keyboard to the bezel.

main keyboard.

Remove

the four Kep nuts (9) that secure the

control panel to the bezel.

COMPRESSED FONT OPTION KIT (LAXX-KJ)

Remove all eight standoffs from the old bezel and

The

attach them, and the four standoffs supplied with

following:

Compressed

Font

Option

Kit

contains

the

the kit, on the new bezel as shown in Figure 9.

Quantity

Item

Part Number

Connect one end of the numeric pad cable (6) to

J1 on the keyboard. Connect the other end to the

30-Tooth Timing

1212446-00

Pulley

connector on the numeric pad (3). Ensure the red

stripe is positioned as shown in Figure 9.

15-Tooth Timing

D-MD-7414908-0-0

Pulley

Carefully

replace

(control

their

respective standoffs and secure with the Kep nuts.

panel,

all

keyboard,

Provide

three

and

adequate

assemblies

numeric

cable

pad)

clearances

around

Pulley Clamp
-

C-MD-7414951-0-0

Timing Belt

1211583-02

Socket Head Cap

9006350-8

Screw (#10-32

all

standoffs.

X 1in.)
1

Hex Socket Set

CAUTION
insulating

washers

9007722-10

Screw (#%-20)

Ensure that

all

installed

Kep Nuts

9006565-00

between the

Kep nuts and the etch side of the

are

Right-Hand Spacer

C-MD-7415010-0-0

circuit boards. Failure to insert washers at required

' Channel Strip

9007036-00

points may cause circuit damage.

The following tools are required for installation: socket

The keyboard cable (5 in Figure 9) must be routed

head wrenches, Phillips screwdriver, feeler gauges, and a

to the inside of standoff (8) and between the bezel
and

torque-type Phillips screwdriver. Use Figures 18 and 19

the component side of the keyboard. This

and the following procedure as installation guides.

prevents possible interference between cable and

print head assembly.

Remove ac power from the DECwriter and remove
the top cover and plastic housing.

Replace the bezel on the cabinet base and secure
with the four screws, lock washers, flat washers,

Remove the ribbon from the print head area.

and spacers.

Press in against the spring as in 1, Figure 18, to
remove belt tension, then slide the timing belt (2)

CAUTION

off both existing pulleys (3) and (4).

The keyboard bezel should be positioned as far

forward (toward operator) as possible to eliminate
Using a socket head wrench, loosen the set screw

interference between the keyboard cable and print

in the pulley clamp (5) until the existing timing

head assembly.

pulley (3) can be removed from the motor shaft.

Ensure that the spacers are placed under the bezel.

This pulley clamp can be discarded.

Failure to do so may result in damage to the print
head because of interference with the keyboard

Loosen the set screw in the other pulley clamp (4),

connector.

then remove and save this pulley.

1-44

cP-213

Figure 18

Installation of Compressed Font Option Kit
(LAXX-KJ)

1-45

Assemble the cap head screw and Kep nuts, then

less than 0.010 in. of clearance between print head

insert through the left side bracket as shown in

and print bar,

(6).

14.

Install

the

new

30-tooth

timing

pulley

Recheck the gap at the center. The gap should be
no greater than 0.014 in, If it is, perform
steps 10

on the

through 14 again.

ribbon drive shaft (4). The side of the pulley with
the flange should be positioned toward the front

Press against the ribbon drive assembly spring and

15.

install the new timing belt on both pulleys.

of the machine. Position the pulley so that there is

9/32-in. clearance between the back of the pulley
and the mounting hardware for the shaft bearing.

16.

Adjust the cap head screw (6) so that the space
between the end of the screw and the ribbon drive

Secure the new 30-tooth pulley using the previ-

assembly bracket is between 0.005 and 0.010 in.

ously removed pulley clémp.

Rethread the ribbon, replace the plastic housing
and top cover, insert paper, and apply power,

17.

Install the new 15-tooth pulley on the motor shaft
and secure, using the new pulley clamp provided.

NOTE

Remove the four screws (7) that secure the print

U.S.-built LA36s with serial number 02-23374 (or

head and replace the existing timing belt with the

Ireland-built 04-10050) and earlier require spacers

new belt supplied. Reassemble the print head but

10.

do not tighten the four mounting screws.

as shown in (8) and (9). The right spacer (8) is

Set the Carriage Adjustment lever to the minimum

between the bracket and the carriage shaft. When

inserted

end

the

side bracket and

loosening the socket head cap screw at the right

gap position (detent closest to the print bar).

end of the carriage shaft, do not allow the shaft to

CAUTION

turn. The channel strip spacer (9) slips over the

It is possible to position the Carriage Adjustment

left side bracket as shown to prevent the timing

lever beyond the minimum gap position. If this is

belt from chaffing..

done, the correct head gap adjustment cannot be
made.

11.

over the

Test After Installation — The DECwriter will print 132
characters in a line that is 8 in. wide. All other normal

Adjust the print head gap with the carriage in the

functions are unaffected.

center of travel. Place a 0.012-in. flat feeler gauge

between the print head jewel and the front surface
of the print bar (parallel to the print bar). Push the

PAPER OUT OPTION KIT (LAXX-KZ)

print head snug against the feeler (Figure 19).

The Paper Out Option Kit contains the following:

CAUTION
that the feeler gauge rides between the

Ensure

Quantity

protrusions on the print head. A feeler gauge with

width

7/16

between the

in.

(or

less)

is needed to fit

protrusions. Do not exert excessive

force on the print head when making the adjustment;

will

cause

the

carriage

shaft to

the

head

screws

Phillips Pan Head

9008033-1

Kep Nuts (#4-40)

9006557

Flat Washers (#4)

9006655

Tie Wraps (5-% in. X

9007880

A Phillips screwdriver and a pair of needle-nose pliers are

the

recommended tools for installation. Use Figures 9 and

moulded inserts in the carriage assembly may be

20 plus the following procedure as installation guides.

damaged.
13.

D-MD-7412424-0-0

C-1A-7011657-0-0

1/8in.)

CAUTION

Do not apply more than the recommended torque
tightening

Paper Out Cable
Micro Switch Assembly|

Screws (#4-40 X

torque.

when

9/16 in.)

Tighten the #4 (6-32) screws to 10 = 2 in./lb of

Part Number

bow,

resulting in more than 0.012 in. of clearance.

12.

Item

Move the print head to the extreme right and left.

Using a feeler gauge, check each position for no

Unplug the

ac power cord.

Remove the paper.

Remove the top cover and plastic housing.

1-46

6-32 SCREWS TO

PRINT BAR

PRINT HEAD

0.012

FEELER GAUGE

BE TIGHTENED 10 + 2

IN./LBS. OF TORQUE

CAUTION

ENSURE THAT FEELER GAUGE IS INSERTED
BETWEEN THE PROTRUSIONS ON THE
PRINTHEAD. FAILURE TO DO SOWILL RESULT
IN IMPROPER CLEARANCE AND SHORTEN
THE LIFE OF THE PRINTHEAD.

,
7393-06

Figure 19

Print Head Adjustment

1-47

CP-2114

Figure 20

Installation of Paper Out Option Kit

(LAXX-KZ)

1-48

2.
3.

Using the two screws, washers, and nuts (3),

A Phillips screwdriver is the only tool required for
installation. Use Figure 21 and the following procedure

switch (2) on the paper guide.

as installation guides.

connectors to the PAPER OUT switch as follows:

mount, but do not tighten, the PAPER OUT

Connect the cable end (4) having the two smaller

Disconnect and remove any previously connected
data input line.

black to bottom, white to top.

4.
5.

Cut the first two cable ties (1) holding the
keyboard cable to the anchors.

Insert the connector end (4) of the 20 mA cable
up through the access hole in the floor and
connect it to J3 on the M7728 logic board.

Secure the cover plate (3) using the two pan head
screws and associated washers (2). Position the

Form the paper out cable along the keyboard

cable and secure both to the anchors using the
supplied cable ties.

Refer to Figure 9 and remove the four screws, lock
washers, flat washers (1) and spacers (2) that
secure the keyboard bezel to the cabinet base,
Turn the bezel upside down on a piece of foam,

Using the needle-nose pliers, attach the paper out
cable white lead to the frontmost connector and

then the black lead to the other connector.

cable (1) as shown.

Test After Installation — Send data into the DECwriter;

energize the unit.

20 MA (DEC 10) CABLE OPTION KIT (LAXX-LK)

guish as the switch is operated. If not, recheck all
connections.

The 20 mA Cable Option Kit contains the following:

Quantity

Adjust- the _PAPE.R O'UT switch so that the PAPER

F)UT light is extinguished when paper is correctly
!nstaliled. Remoye the papfer; the light should
|IILfm|nate. .Contlnue to rgad.just. the PAPER OUT
switch until the proper indication is achieved in

ltem
Cable (2838

D-Al-7009212-1-0

1
9

N-Lok Connector)
Cover Plate
Phillips Pan Head
X
Screws (#8-32

C-MD-7413216-0-0
9006037-1

Replace the housing and top cover.

the correct‘ indicaTest After Installation — Check forlight
when approxi-

Part Number

Connector to Mate-

0.38 in.)

both states.

11.

assembly to the signal source.

the printout should verify a correct installation.

Manually activate the PAPER OUT switch to
ensure proper connections. The front panel
PAPER OUT switch should illuminate and extin-

10.

_
Connect the input end of the 20 mA cable

Insert a piece of paper up through the paper guide.

Plug the DECwriter into an ac source and then

Flat Washers (#8)

Lock Washers (#8)

9006660

9006634

tion of the PAPER OUT display

' 'is the only tool
too requir; ed for
A Philli
illips screwdriver

20 MA CABLE OPTION KIT (LAXX-LH)

as installation guides.

: from the end of paper.
mately 2 in.

installation. Use Figure 22 and the following procedure

The 20 mA Cable Option Kit contains the following:

Item

Quantity
1

Cable

BCO5F-15

Phillips Pan Head

0006037-1

Cover Plate

Screws (#8-32X

Part Number
C-MD-7413216-0-0

ifskwv?/:szs(fis)s)

Insert the connector end (4) of the 20 mA cable

up through the access hole in the floor and

connect it to J3 on the M7728 logic board.
,
Secure the cover plate (3) using the two pan head
screws and associated washers (2). Position the
cable (1) as shown.

0.38in.)

;

Disconnect the remove any previously connected

data input line

3882222

1-49

Connect the input end of the 20 mA cable

assembly to the signal source.

CP-2115

Figure 21

Installation of 20 mA Cable Option Kit

(LAXX-LH)

\y/

/
cP-2115

Figure 22

Installation of 20 mA (DEC 10) Cable
Option Kit (LAXX-LK)

1-51

Test After Installation — Send data into the DECwriter;

The

light shield (4) is a flat-black surface that
minimizes glare and reflections. The shield mounts

the printout should verify a correct installation.

on the sloped surface of the top cover. Peel off the

backing and position on the cover.

SCALE, POINTER, AND WINDOW OPTION KIT

(LAXX-LN)
The Scale, Pointer, and Window Option Kit contains the

The column scale (5)

following items:

Quantity

Item

of Figure 23 details the placement of the scale on

Part Number

the window lip.

Column Scale

C-1A-7414986-0-0

Line Indicator

C-MD-7414953-0-0

Column Pointer

C-MD-7415409-0-0

The print window (6) snaps into place in the top

Print Window

1212009-00

cover opening.

Light Shield

C-MD-7415255-0-0

Phillips Pan Head

9006011-1

Screw (#4-40 X

After loading paper, energize and place the DEC-

3/8-in.)

writer in the local mode.

Flat Washer (#4)

9008172

Lock Washer (#4)

9006632

Phillips

screwdriver

installation.

‘Use

the

only

Figures 2 and

tool

Type the letter “’N’’ five times.

required

for

23 plus the following

10.

procedure as installation guides.
1.

adheres to the lip on the

print window (6) as shown in Figure 23. Insert A

After the

Last Character Visibility

(LCV)

shift,

press the BACKSPACE key once.

Unplug the ac power cord, remove the paper, and

then remove the top cover.

The -right-hand vertical ascender of the last ““N’’
typed should align over the right edge of the line

Install

the line indicator (1)

assembly

using

Remove

the

screws,

beneath

the

ribbon

the

two

insert
(do

not

indicator as shown in insert B of Figure 23. If

on the print head

front

Phillips

screws.

line

indicator

the

necessary, loosen the two screws that secure the

line indicator to the print head and correct the

alignment.

interfere with the

ribbon’s path), then secure with the screws.
12.

The column pointer (2) and its associated spacer

After aligning the line indicator, close the cover,
press RETURN, then type any printable character.

are manufactured as a single unit. The spacer is

attached to the side of the pointer by a thin web.

Before installing the pointer, these two parts must

After the LCV occurs, the red line on the column

be separated at this web. Fold the spacer down

pointer should align with the line on the column

under the pointer to break apart.

scale that corresponds to column No. 2. If not,

Install the column pointer and spacer on the line

the column pointer to the line indicator and adjust

indicator using the #4 screw, lock washer, and flat

the position of the column pointer. Repeat steps

open the cover and loosen the screw that secures

washer (3).

and

until

the

red

line is in the proper

position.

NOTE
If after installing the print window, the red and

NOTE

green positioning lines on the column pointer seem

Prior to the LCV, the green line on the column’

too

remove

the

high

above

spacer

the

from

lip

of the window,

beneath

the

pointer aligns with the column scale to indicate

column

the column in which the next character will print.

pointer.

1-62

'
COLUMN
SCALE

POSITIONING

LEFT-HAND
EDGE

_PROPER

L ALIGNMENT
|

NNNNN - Line

fi:ij/'m DICATOR
B

cpP-2117

Figure 23

Installation of Scale, Pointer, and Window
Option Kit (LAXX-LN)

1-63

DF11 ADAPTOR KIT (LAXX-KH)

Use Figures 25 and 26 plus the following procedure as
installation guides.

The DF11 Adaptor Kit contains the following:

Quantity

Item

Part Number

Adaptor Bracket

C-MD-7413104-0-Q

Wired Assembly

B-1A-7010599-0-0

Cable Assembly

C-1A-7010598-0-0

Phillips Pan Head

9006001-01

Remove the Paper Advance knob (2, in Figure 25)

by unscrewing the #6 screw (1, in Figure 25) from
the center of the knob.

Screws (#2-56 X

1/4-in.)
1

Unplug the ac power cord and remove the existing
top cover.

After removing the Paper Advance knob from the

tractor drive shaft (4, in Figure 25) remove and

Phillips Pan Head

discard the sleeve (B), then slide two “O" rings (3,

9006023-01

Screw (#6-32 X

in Figure 25) all the way onto the shaft.

7/16-in.)
A Phillips

screwdriver

is the

only

tool

4,
required

for

Replace the knob on the tractor shaft and secure
with the screw and washers.

installation. Use Figure 24 and the following procedure
as installation guides.

Insert the new cover onto the DECwriter. Press the
“acoustical

Secure the adaptor bracket (1) to the cabinet door

coupler cable down through the rear

access hole as shown in Figure 26.

as shown. Use two #6-32 screws.
6.
2.

Connect the cable end into the EIA connector (J4)
on the logic board.

Attach the wired assembly (2) to the bracket with

a #6-32 screw (3).

The cable assembly (4) should be soldered to the

Test

wired assembly as in Figure 24.

After

Installation — Perform

the

following

procedure:

Connect the cable connector to J4 on the logic

Set for power on, on-line, and correct baud rate.

board.

Insert the DF11 communications option into the

Using a telephone, call the sending system and,
after hearing the carrier, place the handset into the

connector in the wired assembly (2) and secure the

muff assembly.

other end to the adaptor bracket using the two

small screws supplied (#2-56). The screws insert
through the hollow rivets in the DEC-CHIP handle

and secure into the adaptor bracket at (5).

NOTE
The cord end of handset is placed in muff with

"dot” and/or word “CORD’’ next to it.

Test After Installation — Refer to the checkout procedures for the DF 11 module installed.
3.

The carrier light illuminates within 5 seconds and
then normal system operation can be performed.

ACOUSTICAL COUPLER OPTION KIT (LAXX-LM)
The Acoustical Coupler Option Kit contains a new cover

(D-AD-7012144-0-0)

that

replaces the

existing LA36

NOTE

cover and a rubber ““O” ring (9009793-00) that fits over

the

tractor

drive shaft to minimize mechanical

Before removing the telephone handset from the
muff assembly, place the DECwriter in the local

noise

generation during a paper advance. A Phillips screwdriver

mode.

is the only tool required for installation.

from causing printing of random characters.

1-54

This action prevents the disconnect noise

6-32

|~ SCREW

(

@‘/__J————— BA2 (RED) +5V
T

BB2 (BLUE) -12V

L
. e

BD1 (VIOLET) RCVD
DATA TTL

BN2 (GREEN) +12V
i

BT1

(BLACK) GND

T Bv2 (YELLOW) XMTR

oo 2118

DATA TTL

Figure 24

Installation of DF11 Adaptor Mounting Kit
(LAXX-KH)

1-6b

Figure 25

Installation of ““O’" Ring on Tractor
Drive Shaft

CARRIER

INDICATOR

TELEPHONE — |
HANDSET

Figure 26

Installation of Acoustical Coupler Option Kit

(LAXX-LM)

1-56

SECTION 2

LA35 USER’'S INFORMATION

LA35 GENERAL INFORMATION

INTRODUCTION

The LA35 DECwriter is a medium-sized, low-cost printer for use as a local or remote printer only. It is capable of
handling multipart and multiform line printer paper from 3 to 14-7/8 in. (7.62 to 37.78 cm) wide. It is especially
suited for preprinted forms due to its horizontal and vertical positioning capabilities.

OPTIONS

The basic LA35 DECwriter can be expanded to provide the user with a number of functional options for receiving

and handling data. These functional options are described in the following table.
LA35 Options
Option

Name

LAXX-LB

Expander Option
Mount

Description

The Expander Option Mounting Kit includes the logic, cables,
and mounting hardware required to expand the LA3b to include
LAXX-KX,
LAXX-KW,
LAXX-KV,
LAXX-LA,
options
LAXX-KY, and LAXX-PK.

LAXX-PK

APL/ASCII Dual

This option provides an APL alternate character set for use with

Character Set

the standard character set in the LA3b.

LAXX-LA

Auto LF After CR

The LAXX-LA option causes the printer to execute a line feed

LAXX-KV

Top of Forms

after each received carriage return code.

Control

Controls mounted under the top cover provide the operator with
a method of selecting the length of the paper to be used. After
the desired setting is selected and the paper is lined up for proper
vertical alignment, the operator presses the SET TOP OF FORM
switch so that the internal logic will be preset to this paper length
as defined by the operator.

LAXX-KW

LAXX-KX

Selective Addressing

The Selective Addressing Option allows the LA35 to operate with
other terminals on a single data communications channel.

Auto Answerback

The Automatic Answerback Option allows the terminal to trans-

and Auto LF Options

mit a preprogrammed message of 20 characters (maximum).

The message is initiated upon receipt of the ENQ control code
from another device. The LAXX-KX may be configured to
incorporate the features of the Automatic Line Feed option

(LAXX-LA).
LAXX-KY

Forms Control,
Vertical and

Horizontal Tabs

The Forms and Tabbing option enables the printer to set
horizontal and vertical tab positions via the system software. This
option also incorporates features of the Top of Forms option
(LAXX-KV) and operates in the same manner.

LA35 Options (Cont)
Option

Name

LAXX-LG

Description

The LAXX-LG EIA/CCITT interface provides the user with an

EIA/CCITT Interface

RS232-C

interface

with

modem

control

and

includes a 9-ft

(3.54-m) cable terminated with a standard EIA connector.

LAXX-KH

DF11 Mounting Kit

The DF11 Mounting Kit enables the user to mount one of the

DIGITAL series DF11 communication options in the LA35.

LAXX-KJ

Compressed Font

The

Option

provides the LA35 with the ability to print 132 columns on a

Compressed

Font

Option

mechanical

option

that

form 8-1/2 in. (21.59 cm) wide.
LAXX-LC

TTLTOCCITT

The TTL to CCITT (V28) Converter and Modem Protector is a

(V28) Converter and

BPO

Modem Protector

CCITT (V28), with BPO-required modem protection circuitry.

LAXX-LH

Current Loop Cable

20 mA current loop with Mate-N-Lok.

LAXX-LK

Current Loop Cable

20 mA current loop with 4-pin plug for DEC10.

LAXX-KG

EIA Interface

The LAXX-LG interface includes a 9-ft (3.54-m) cable terminated

DATEL services interface that meets the requirements of

with a standard EIA connector.

LAXX-LN

Scale, Pointer, and

Operator convenience items that assist in positioning the print

Window Kit

head on preprinted forms and for locating horizontal tabs.

LA35 DECwriter MODEL VARIATIONS

detailed description of these jumper modifications and

The LAS35 variations and associated model numbers are

the

listed below.

DECwriter Maintenance Manual.

associated

cabling

required,

refer

the

LA35

LA35-CE

90-132V, 60 Hz

LA35-CF

180-264 V, 60 Hz

LA35 Parity

LA35-CH

90-132V, 50 Hz

The

LA35-CJ

180-264 V, 50 Hz

error printout. To modify this configuration for odd or

LA35 is configured with no parity and no parity

LA35-DE

90-132 V, 60 Hz

even parity with or without error printout, jumpers on

LA35-DJ

180-264 V, 50 Hz

the

logic

board

must

changed.

For

detailed

description of these jumper modifications, refer to the
LA35 DECwriter Maintenance Manual.

LA35 JUMPER CONFIGURATIONS

LA35 Speaker (Bell) Volume
LA35 Optional Current Loop Configuration

The LA35 can be configured for a lower speaker volume

The LA35 is normally configured for passive operation.
To

modify

jumpers

this

configuration

for

active

by removing a jumper. For a description of this jumper

operation,

the logic board must be changed.

modification, refer to the LA35 DECwriter Maintenance

For a

Manual.

2-2

LA35 SPECIFICATIONS
Interface

Printing

Switch

selectable:

Integrated or 20 mA current loop or EIA/CCITT.

15, or 30 characters/second

10,

throughput
Ribbon

DIGITAL-specified nylon fabric (Part No. 36-10558)
Spool assembly: 0.5 in. (1.27 cm) wide X 40 vyd

Line Length

132 characters maximum

(36.58 m) long

Spacing

10 characters/in. (horizontal)

Power

6 lines/in. (vertical)

90—132 Vac or 180—264 Vac
= 1 Hz
or 60 Hz
50

Characters

300 W maximum (printing)

96 upper/lower case ASCII

160 W maximum (idle)

7 X 7 dot matrix (0.07 X 0.10 in.) (1.77 X 2.54 mm)

Temperature
Paper

Operating

Variable width: 3 to 14-7/8 in. (7.62 to 37.78 cm)

10° to 40° C (50° to 104° F), noncondensing

Single-Part:

Nonoperating

-40° to 66° C (-40° to 151° F) noncondensing

15 Ib paper minimum

Card stock thickness of 0.010 in. (0.25 mm)
maximum

Relative Humidity
Operating

Multipart:

10 to 90% with a maximum wet bulb temperature

2- to 6-part (see Notes)

of 28° C (82° F) and a minimum dew point of 2°

Thickness of 0.020 in. (0.50 mm) maximum

C (36° F), noncondensing

Tractor-drive, pin-feed

Nonoperating
NOTES

5 to 95%

Multipart forms may have only one card part. The

card must be the last part.

27.5in. (69.85 cm) wide

NCR or 3M paper, up to 6-part, must use ribbon
on top copy. First surface impact paper is not

recommended.

Dimensions

33.5 in. (85.09 cm) high
21.7 in. (65.12 cm) deep

’

Weight

Continuous-feed, fan-fold business forms with 3or 4-prong margin crimps on both margins (multi-

97 Ib (44.09 kg)

part) are recommended. Stapled forms are not

recommended and may damage tractors and other
areas of the machine. Dot or line glue margins are

acceptable (if line is on one margin only). Do not

line glue both margins as air will not be able to
escape and poor impressions will result.

2-3

LA35 OPERATOR’S GUIDE

BAUD

RATE

v 150-"%

PAPER
ouT

110

7666-22

LA35 OPERATOR CONTROLS AND INDICATORS
NOTE

Dot

switch

indicates

function

PAPER OUT Indicator
of

switch

The PAPER OUT indicator, when illuminated, gives a

when

depressed.

visual indication that the LA35 is out of paper. Printing
stops when the out of paper condition is detected.

LINE/LOC Switch
The LINE/LOC switch is a 2-position operator control
switch. When in the LINE position, the LA35 is enabled
to receive data. When in the LOCAL mode, the LA35

POWER ON/OFF Switch

receive line is disabled and only local operation can be

The POWER switch connects and disconnects the line

performed.

voltage to the

LA35 DECwriter. The POWER switch

should be in the ON position for normal unit operation.

BAUD RATE Switches

When

The

head, the switch should be turned OFF.

BAUD

RATE switches select the rate at which

changing paper,

ribbon, or adjusting the print

characters are received over the communication line.

Switch

Character Rate

110

10 (characters/second)

300

30 (characters/second)

110 and
300

15 (characters/second)

HEAD OF FORM Switch

This switch is operational only when the Top of Form
option is instalied. Its function is to advance the paper
to the head of the form.

2-4

Carriage Adjustment Lever

The Carriage Adjustment lever controls the print head
gap for single-part or multipart forms.

CARRIAGE

ADJUSTMENT
LEVER

7666-16

Paper Advance Knob

The Paper Advance knob pushes in to disengage the line
feed gear train, allowing fine vertical adjustment of
paper position. Coarse vertical adjustment is achieved by
simply turning the knob. Each detent turned represents
one line.

H
IN HERE
PUS
AND TURN TO
ADJUST PAPER
VERTICALLY

PAPER

ADVANCE

KNOB

7595-4

Tractor Adjust Knob
The Tractor Adjust knob allows fine horizontal adjustment of forms.

7595-7

Bell
The bell indicates that a bell code was received.

USING THE LA35
Using the

LA35 requires almost no operator interven-

Set the BAUD RATE switches to the applicable
baud rate.

tion. These few steps are all that may be required to

place the LA35 on-line.

Load paper.

The LA35 is now on-line and fully operational.

Set the LINE/LOC switch to LINE.

2-6

Set the POWER switch to ON.

LA35 INSTALLATION AND CHECKOUT GUIDE
GENERAL INSTALLATION INFORMATION
This section contains the step-by-step procedures for
unpacking and unit checkout to ensure that the unit was

Install ribbon per ribbon installation procedure

operating properly prior to connection to the com-

3).

(Section 3).

Install paper per paper loading procedure (Section

not damaged during shipment and that the unit is
munication system.

CAUTION

Before connecting the LA35 to a power source,

The LA35 DECwriter should be installed in an area that
is free of excessive dust, dirt, corrosive fumes, and
vapors. To ensure that the unit has proper ventilation
and cooling, the ventilation openings on the side of the
cabinet should not be obstructed. A minimum 4-in.
clearance between units must be maintained at all times.
Adequate service clearance must also be provided for
servicing the unit. (Refer to the figure on the following

ensure that the line voltage and frequency are
compatible with the power requirements of the
machine. Ensure that the POWER switch on the
console is OFF.

Connect the LA35 line cord to the correct wall
receptacle; press the control panel POWER switch
on the ON position. The print head automatically

page.)

positions itself to the left margin.

UNPACKING AND REPACKING

Unpack the LA35 as described in Section 3. If it
becomes necessary to ship the LA35 to another site,
refer to the repacking procedure described in Section 3.

Set the BAUD RATE switches to the applicable
baud rate.

Set the LINE/LOC switch to LINE.

CHECKOUT AND ACCEPTANCE PROCEDURES
Perform the following procedure. If the desired results
are not achieved, refer to the troubleshooting guide in

Run the applicable software and observe printout
for the desired results.

Section 3.

2-7

27.5"
(696 mm)

[

O-1

?J:

\fl‘l

[

—

]

( 33.5")

(851 mm)

21.7"

—

( 551mm)

’

25.0"

~
(635mm)
‘

F————————!

SERVICE

AREA

I
|

|
I

[ o Ty —

D—

—

—
T

DIMENSIONS

A|lB|CcC|D

|E|F

|217 [v¥| 96

INCHES

275|

MILLIMETERS

696|356(551

|V* |2440

* CURRENT LOOP CABLE (BCO5F) LENGTH IS
15

FT ; E1A

CABLE

LENGTH

9FT

(2744 mm)

’

}

SERVICE

AREA

d
CP-2021

LA35 Site Considerations

2-8

CONTROLS AND INDICATORS FOR LA35 OPTIONS
The following options include additional controls not
present on basic LA35 DECwriters.

FORMS CONTROL OPTION (LAXX-KV)
This option requires the addition of a top-of-form
control assembly, which is installed beneath the top

The column indicator is used in conjunction
with the column scale. There are red and green
indicator lines on the column indicator to indicate the next column to be printed. The green
line is used before the Last Character Visibility
shift, the red line after the shift.

cover on the print head chassis. There are two con-

trols

on this assembly:

SET TOP OF

FORM and

FORM LENGTH (Figure 27).

SET

clears

loads

OF FORM is a pushbutton that
the previously loaded form length and
the current setting of the FORM

TOP

ACOUSTICAL COUPLER OPTION (LAXX-LM)
There is a single indicator associated with this option.
This red indicator is mounted on the right side of
the cover and lights when the telephone handset is

properly inserted in the muff assembly and a carrier
is detected by the coupler circuitry.

LENGTH switch.

FORM LENGTH is a 12-position rotary switch
that is used to preset a form length (in inches)

SET TOP OF FORM

into the Forms Control.

FORMS CONTROL, VERTICAL TABULATION, AND
HORIZONTAL TABULATION OPTION (LAXX-KY)
This option also utilizes the top-of-form control

SINGLE LINE

assembly (Figure 27).

7
2

SCALE, POINTER, AND WINDOW OPTION

FORM LENGTH

(LAXX-LN)
This option contains three indicators: Column Scale,
Line Indicator, and Column Pointer as shown in

(INCHES)

Figure 28.

The column scale is a 17.25-in. long strip that
is marked off in 132 divisions representing the
possible column locations. The column scale
adheres to the plastic print window.

POSITION OF

NEXT CHARACTER
TO BE PRINTED

The line indicator mounts on the print head

and is used to establish two printing locations.

The longer top surface indicates the baseline of
the characters in a particular line. When setting
up a form or rolling back to a previously

Option (LAXX-PK).

COLUMN
/ POINTER

CHARACTER
BASELINE

printed line, this top surface is used to exactly
align where the next character will print. The
smaller surface on the right side indicates the
position where the next character will print.
This position is valid only after the Last Character Visibility shift. The line indicator is also
included in the APL/ASCII Dual Character Set

b
\

SPACER

(IF NEEDED)

LINE INDICATOR

Figure 28

CP-2099

Line Indicator and Column Pointer

SETUP AND OPERATING PROCEDURES FOR LA35 OPTIONS

LA35 options requiring setup or operating instructions

while the

printer

form.

best way to determine the required

addition

those

instructions given for the basic

LA35 are presented in the following paragraphs.

number

mechanism

is positioning the

of these fill characters is to count the

number of lines from the last line printed to the

APL OPTION (LAXX-PK)
An

The

bottom of the form and insert this number of fill

LA36 DECwriter containing this option can print

characters.

either the standard ASCII characters or the alternate

character

buffer

APL characters. Character set switching is controlled by

return, 15 fill characters can be subtracted from

either a Switch

character combinations when the
is

empty

prior

carriage

In or Switch Out command. Switch In

the above number. All fill calculations are made at

(code 016g) selects the standard ASCII character set;

300 baud. For 150 baud, halve the values (round

Switch Out (code 017g) selects the alternate APL set.

off to the next higher number); for 110 baud, use

one third (round off to the next higher number).
Figure 29 shows the bit assignments for both character
sets.

Once a form feed has begun, it cannot be aborted.
If a second Form Feed command is issued within

FORMS CONTROL OPTION (LAXX-KV)

16 lines from the next top of form, the paper will

Setup — (The DECwriter is assumed to be deenergized.)

not stop at that next top of form, but will execute

Measure the form to determine its length in inches. Then

the second Form Feed command and skip one full

remove the top cover from the LA36 as in the paper

form length. If the second Form Feed command is

loading procedures. On the Forms Control panel, set the

FORM

LENGTH

rotary switch to the

issued

number that

with

or more lines remaining to the

bottom of the present form, it will be ignored.

corresponds, in inches, to the length of the form (Table

Like- wise, more than two Form Feed commands

3). Proceed with the normal loading of the forms. When

within one form interval will not be recognized.

completed, use the Paper Advance knob to align the top
line of the form with the print head. (Normally the top

Table 3

line is 2 or 3 lines below the perforation, but it can be

FORM LENGTH Switch Positioning

established at any line on the form.) Close the top cover
and energize the DECwriter. The form length indicated

FORM

by the FORM LENGTH switch is automatically entered

Form Length

during the power-up sequence.

(inches)

LENGTH

Printable Lines

Switch Setting | Per Form (Maximum)

The procedure for setting up the Forms Control Option

when the DECwriter is energized is the same except that

3.5

the SET TOP OF FORM pushbutton has to be pressed

after the form length is selected.

5.5

Feed

8.5

Operation — The program-generated
command

command,

014g.

the

Upon

paper

receipt

will

Form
of

advance

Feed (FF)
Form

the

top-of-form line.

FORM CONTROL PROGRAMMING

NOTES
1.

To avoid losing incoming characters during a form

control operation, fill characters must be added.

FORMS CONTROL, VERTICAL TABULATION, AND

These nonprinting fill characters (such as NULL or

HORIZONTAL TABULATION OPTION (LAXX-KY)

DELETE) effectively slow up the data input rate

Setup — This option requires three setup procedures.

2-10

01029.‘“#$m’w3/()*+y“6/

]

g»

=4 =} 3

a. Standard (ASCII) Character Set

.
o
,

Bit Assignments for ASCIl and APL
Character Sets

2-11

—

M4 Eln|lE|l=|XlO]—~
OzlQlm|unl|l
Xl
=TolFlIF|O|lZ

b. Alternate (APL) Character Set

Figure 29

|
Ao

—

=92

S —>

T—

.m =

R O - P I O o B N P B R RY R B B I

)

(=)

Forms

Control

Setup
— Exactly

the

same

the

Forms Control Option (LAXX-KV).

Then

space the print head to the next desired tab
location and store this location in the same manner.
The number of horizontal tabs that can be set is
limited by the available number of print columns on

Vertical

Tabulation

Setup — First perform the

Control

setup

and,

after establishing the top-of-form

the form.

position, issue

Line

Feed commands

Forms

(0128) to move

For example, a

132 tabs.

the form to the desired location of the first vertical

zontal

tab

move.

tab. To store this

codes

0338,

then

line count,

issue 0338 and

0638.

Advance the form to the next vertical tab and store
this

location

tabs

that

can

set

printable

lines

the

form

11-in.

the

deep form

same

manner.

limited

used.

The

number

the

number of

For example,

tabs

are

(cleared) during

before

Use

determine

the

same

number

are

perform

Once

aborted.
issued
tab
at

no
a

tab

locations

form

feed

vertical
If a

stopping
that

tab

set,

(FF)

rule

fill

the

and

number

is greater.

The 12 fill characters are

carriage
of

return,

spares

are

only 0.55 times

needed

for

fills.

All

the
fill

calculations are made at 300 baud. For 150 baud,

halve the

value

(round

off to the next higher

to the next higher number).

LA35 will

advance

the

begun,

Vertical

lines

the

cannot

paper

position,

but

will advance to the

tab

Tab command

lines

remaining

location.

vertical

the

will

not stop

second

Likewise,

present

advance,

more than two

are

Tab

no tab

command

received

locations set, the

advance to column

132 and

and

print head

remain there

Once a

horizontal tab has begun, it cannot be

aborted.

If a

within

issued

zontal

Ver-

is issued with 17 or more

the

Horizontal

until a carriage return is received.

Tab command is

from

If a

there
will

position,

vertical

ignored.

has

second

tical
be

number); for 110 baud, use one third (round off

within

second

determined

return time. In instances where the tab does not

paper to the next top-of-form location.

needed to compensate for the maximum carriage

a Vertical Tab command (0138) is issued and

there

required

0.55 (round off to the next higher number) or 12,

characters.

to effectively slow up incoming

number

whichever

form feeding sequence, the ver-

form.

The

multiplying the number of spaces between tabs by

slow up the input data while the mechanism is

To ensure against loss of data while the printer
acters are used

tical tabulation action requires fill characters to
the

issue

tabs are can-

mechanism is executing horizontal tabs, fill char-

power-up

NOTES

advancing

horizontal

hori-

tabs,

NOTES

VERTICAL TABULATION PROGRAMMING

the

initiate a

horizontal

HORIZONTAL TABULATION PROGRAMMING

data.

Similar to

all

0628. All

could have up to' 66 vertical tabs.

cancelled

0118 will

clear

celled (cleared) during a power-up sequence.

sequence,

To clear all vertical tabs, issue codes 0338 and 0648.
All

17-in. wide form can have

Command

will

Tab commands within one tab interval will not

Tab command

tab stopping position, the head will

not

advance to

the second horizontal tab location.

If a second

be recognized.

Horizontal

16 spaces from the next hori-

stop at that next position, but will

Horizontal

Vertical

second

Tab

spaces

will

Horizontal

command

remaining

ignored.

Tab

issued with

the

Likewise,

commands

17 or

present advance,

than

two

within

one

tab

interval will not be recognized.

Horizontal

Tabulation

Setup
— Before

zontal tabs, issue a carriage return

setting

ensures that the print head starts at the
Issue space characters

head

location.

AUTOMATIC LINE FEED OPTION (LAXX-LA)

left margin.

The

(by code 0408) until the print

positioned

the

this

location,

store

hori-

(code 0158). This

desired

horizontal

issue

codes

Auto

Line

Feed

presence of jumper W1

tab

bly

0338

then 0618.

circuit

board.

Table

action

controlled

the

on the auto line feed assem4 shows the various condi-

tions that produce the specified number of line feeds.

2-12

When W1 is not cut out, the DECwriter will automatically insert a Line Feed command after each
Carriage Return command received. This is a convenience for existing programs that do not normally
have a Line Feed after a Carriage Return command.
To disable this automatic insertion of the Line Feed
command, cut jumper W1 located on the Automatic

NOTES

Spaces are counted as characters.

shorter than 20 characters can be
terminated by making the last character a NUL
(0000000). All remaining characters are disregarded. A full 20-character message does not

Line Feed Option circuit board.

Messages

require

Table 4

Auto Line Feed Setup
Number of

Initiating
Action

Jumper W1
In or Out
In
Out

Line Feeds
Produced

Receive CR with LF

Receive CR without LF

Receive CR with LF
Receive CR without LF

1
0

The Automatic Answerback Option also contains the
operational features of the Automatic Line Feed
Option (LAXX-LA). The Auto Answerback circuit
board contains two factory-installed jumpers that can
be cut out to eliminate certain operations of the
line feed function. The possible jumper
auto
configurations are:

Add LF to

NOTES

be performed by the printer.

With jumper W1 inserted, a nonprinting, nonspacing fill character must be sent after each
carriage return. An idle (marking) line time of
one character is required after each carriage
return to ensure no loss of data during the
mechanical action of the printer.

AUTOMATIC ANSWERBACK OPTION (LAXX-KX)

The Auto Answerback Option provides for up to 20
programmable character locations. This stored message
is transmitted when an ENQ (0058) command is
received.

The message is stored in twenty 7-bit slide switches
located on the Auto Answerback board as shown in
Figure 30. The 7-bit ASCII code for the letter ““a’’ is

also shown. Slide switch No. 1 corresponds to b1
and

the

position corresponds to an asserted

(high) logic state.

Any legitimate ASCII character can be included in
the answerback message, including commands, alpha,
or numeric characters.

Action

Jumpers

AUTOMATIC LINE FEED PROGRAMMING
If jumper W1 is not cut and the received program already transmits a line feed after each
carriage return, a second line feed action will

a NUL at the end.

In
Out

N/A
N/A

Received CR

Yes
No

SELECTIVE ADDRESSING OPTION KIT (LAXX-KW)

The Selective Addressing Option has two 7-bit DIP
switches mounted on the logic board as shown in
Figure 31. One switch establishes the unique address
code: the other the group address. These codes are
entered by positioning the seven slide switches as
shown in the example of Figure 31.

Under the 7-bit code, a practical limit of 123 devices
may be interrogated, since the selection command
codes (CTRL D, CTRL E, CTRL B, CTRL C, and
CTRL F) should not be used as addresses. However,
it may be advisable to set the limit to 96 devices, as
the 32 ASCIl control codes may cause other undesired systems operation. When group selecting, there
is no limit to the number of terminals that may be
in the group.

The inherent receive-only characteristic of an LA3b
establishes the terminal as a slave when connected
into a multipoint communications network. There are
three possible slave states as follows:

Broadcast Slave — A condition that allows all

terminals in the network to receive data transmitted by the master.

[lalal "L

Figure 30

Location of 20 Answerbac k Message
Characters

2-14

Figure 31

Location of Address Setting Switches

2-15

MASTER
TERMINAL

BROADCAST

SLAVES

(ALL 6)

GROUP SLAVES

(1,2,83)
UNIQUE SLAVE

(JUST # 3)

SLAVE TERMINALS

Figure 32

Cp-2188

Typical Selective Addressing Communications
Network

QGroup

Select

Slave

— When

addressed

by the

they do not acknowledge their addresses, even though

master using the group address entered into the

the

Group

The master terminal

Select

switch

the

option

board,

particular group of terminals can receive data sent

address

present

the

communications

line.

establishes whether the slave ter-

minals are in one mode or the other.

by the master. Terminals not having this particular
address do not receive data even though

The following six commands are generated at the master

they are within the same communications network.

group

terminal and control the operation of the slave terminals

in the communications network.

Unique Select Slave — Each terminal can have a
uniqgue address which is different from its group

address code. When addressed using this unique
code

master,

possible

000g (NUL) — Used to reset all slave terminals to
their address mode. This action occurs before the

to establish

master sends addresses down the line.

communications between these two terminals and
no other terminals in the network.

2.
Figure 32 depicts

a communications network of seven

terminals.

It is assumed that terminal A is the master

and

other

the

six

are

slaves,

address;

terminals

and

address

while

and

each

with

address

unique

place.

3 have the same group
have

different

003g (ETX’) — Upon receiving 003g, all slave
terminals

switch

mode

from

and

This allows

the

data

terminal

mode

selection

the

can

take

a master to select additional

devices without having to surrender the lines or

group

having to readdress previously selected stations. To

address. When the master (A) transmits in broadcast,

continue

all terminals print the transmission. When the master

normal selection rules apply, with the sequence

addresses

terminating

only

the

these

three

having the

receive

the

same

group

transmitted

address,

data.

The

addressing
with

additional

002g to

terminals,

lock all

devices

the
into

either the selected or unselected mode.

master can also use the unique address of one of the
six

establish

disregard

addition,

all

the

addresses to

communication

transmission

master

can

while

between

address

the

other five

these

two.

multiple

(BELL) — Used to select all terminals to

receive simultaneously (broadcast mode). Until a

unique

form other groups (i.e., terminals

006g

code 002g has been received, the BELL code does

1, 3,

not cause the bell on the printer to sound.

and 6 can be grouped to receive the same data if the
master sequentially addresses these terminals).

Slave terminals operate in either the address mode or
data

mode.

the

address

mode,

terminals

respond

002g (STX) — Used to “lock’” all terminals in their
selected

or unselected mode and to prevent an

to character combinations that make up their broad-

unintentional selection during data transmission.

cast,

No terminal begins to print until 002g is received.

unique,

group

addresses.

In the

data

mode,

0058

Select (add-on)

wused
with
uniquely
selected slave terminals (has no effect on broad-

cast

(ENQ)—

and

uniquely

Only

group
selected

Answerback

selected

To add other terminals to terminals already selected
without having to readdress all terminals, perform the

slaves). When a
has an Auto

following:

slave terminal

Option

(LAXX-KX)

installed

and
Issue 0038.

receives a 0058, the stored answerback message
is sent back to the master terminal. This allows
verification

that

addressed.

Type new address or addresses.

the

correct slave

terminal

Issue 0028.

The

answerback

message

Iis

Send message — 0048 at the end of a message.

being
transmitted after the EIA interface CLEAR TO

SEND signal goes high.

ACOUSTICAL COUPLER OPTION (LAXX-LM)

0048 (EOT) — Used to reset all terminals on

— The following conditions must be met before
Setup
acoustical coupler. printer power ON, on-line,
the
using
matched to sending system, Call the number
rate
baud
of the sending system and listen for the carrier sound
(loud whistle). After receipt of carrier, place the handset
into the acoustical coupler muff assembly with the
phone cord end of the handset inserted into the muff
with the “’dot’’ and/or word ““CORD’ next to it. Within
5 seconds, the carrier light illuminates. Normal system

the line so that none are selected.

The master establishes the type of slave as follows:
Broadcast
Issue 0078.

Issue 0028.

Send

— All terminals receive 0048 at
message

the end of a message.

operation may now commence.

Group

Type group address.

NOTE

Issue 0028.

Send

— all
message

Before removing the telephone handset from the muff

terminals in group receive

assembly, place the DECwriter in the local mode. This

0048 at the end of a message.

action

Unique Select
Type unique address.
Issue 0058.

Type any character.
Issue 0028.

Send

message—

prevents

the

disconnect

printing of random characters.

Addressed

terminal

receives

0048 at the end of a message.

2-17

noise from

causing

INSTALLATION AND CHECKOUT OF LA356 OPTION KITS

INTRODUCTION

Figure 33 contains three basic cabling diagrams for the

Place a grommet (3) over each stud that sticks up
through the brackets.

LA35. These diagrams depict the cabling configurations

between

the

M7728

logic

board and the

Expander

Carefully replace the logic board on top of the

Mounting Option (LAXX-LB) for the various option kits

grommets

available.

Before

associated washers previously removed.

mended

that these

installing

any

diagrams

option,

consulted

recom-

and

secure

with

Option

Mounting

Kit

screws

and

On the option distribution board assembly (Figure

34), remove screw (4)

EXPANDER OPTION MOUNTING KIT (LAXX-LB)
Expander

six

to ensure

proper cabling.

The

the

contains

and loosen screw (5) on

each hinge bracket.

the

following:

Squeeze each

hinge

bracket toward the middle

until the hinge tabs (2) of the side brackets can be
inserted into the pivot holes as shown.

Quantity

item

Option Distribution

Right-Hand Side Rail

Part Number

D-CS-5411668-0-1

Insert the two screws (4) and tighten these screws
and screws (b).

Board Assembly

D-MD-7414045-0-0

10.

Assembly
1

Left-Hand Side Rail

D-MD-7414044-0-0

Assembly

Lock both Y%turn fasteners (6) to secure the option
distribution board assembly to the side rails.

11.

Grommets

9007017-00

Interconnecting Cables

C-1A-BC08S-1B

+5 Volt Power Cable

C-1A-7010001-8

Connect the interface cables as shown in Figure
33, depending upon the options being installed.
_

CAUTION

The ribbon cables between the logic board and the
expander board must be installed so that one cable

A nut driver, Phillips, and straight blade screwdrivers are

end has the ribbed side of the cable facing up and

required to install the Expander Option Mounting Kit.

the other end has the smooth side up. Ensure that

Use Figures 33 and 34 and the following procedures as

A connects to A at each cable end. Failure to

installation guides,

observe

this

polarity

may cause a

logic board

failure.
1.

Unplug the ac power cord.

Unhook all cables from the logic board.

Remove the six screws and washers that secure the
logic board to the cabinet door and then remove
the logic board.

Place the right and left side brackets (1, Figure
34), over the screw studs as shown. The hinge tabs

of the side brackets (2) should be point inward
toward each other and toward the interior of the
cabinet.

12.

Reconnect the +5V supply cable (black and red
wires) to the logic board. Connect one end of a

similar cable (supplied with this option) to the +b

and GND terminals or the power board and the
other cable end to the Faston terminals (7, Figure
34)

on the option distribution board assembly.

Route the cable with existing cables to the power
board.

Test After Installation — Energize the DECwriter. In the
on-line mode, data sent will produce printed characters.

TO J1 POWER BOARD

NOT USED

20 mA SERIAL INPUT

TO FRONT PANEL

CONTROL BOARD

(IF USED)

I—EIAINPUT

(IF USED)

M7728 LOGIC BOARD

A. No options installed

TO J1 POWER BOARD

— EIA INPUT

(IF USED)

20 mA SERIAL INPUT

(IF USED)

M7728 LOGIC BOARD

TO FRONT

NOT

PANEL
CONTROL

BOARD

IJSI

IJ3I

l'le

USED
o

lu ’

|J4l

S—

SE—

EXPANDER

OPTION

MOUNTING

(LAXX-LB)

B. Any option and auto line feed or
auto answerback options nof installed

TO J1 POWER BOARD

—

20 mA SERIAL INPUT

EIA INPUT

(IF USED)

M7728 LOGIC BOARD

'._.

|J3l

|J1I IJS['

lasl

|
ld3l

IJ4’

TO FRONT

PANEL

CONTROL
BOARD

NOT USED

|
IJZI

NOT USED

|J1|

|
|J4I

EXPANDER

MOUNTING

OPTION (LAXX-LB)

C. Any option and auto line feed or
outo answerback options installed.

cP-2191

Figure 33

Cabling Configurations for Various LA35
Options

2-19

TO FRONT
PANEL CONTROL

DOOR (DECWRITER II)
REF

\
\

//////// )

TO LOGIC

BOARD (MPC)

CONN J5

Z\a
g
>

i‘

‘

///////'
A

/////

///

cP-2104

Figure 34

Installation of Expander Mounting Kit
(LAXX-LB)

2-20

APL OPTION KIT (LAXX-PK)

Test After Installation — Install paper and apply power.
In the line mode, the DECwriter will print APL

The APL Option Kit contains the following:

characters when program selected.

Part Number

Quantity

Item

APL/ASCII Dual Char-

1
1

B-UA-H851-0-0

Edge Connector
APL ROM
APL ROM

Phillips Pan Head

9006011-1

acter Set Board

FORMS CONTROL OPTION KIT (LAXX-KV)

D-CS-M7732-0-1
The Forms Control Option Kit contains the following:

23086A6

23087A6

Quantity

Screws (#34—40

X 0.38 in.)

Top-of-Form Control

Part Number
D-AD-7011503-0-0

Assembly Board

Flat Washers (#4)

9006655

Lock Washers (#4)
Line Indicator

9006688
C-MD-7414953-0-0

item

Top-of-Form Module

D-CS-M7735-0-1

Board
1

Top-of-Form Cable

D-1A-7011516-0-0

Phillips Pan Head

9006011-1

Screws (#4-40 X 3/8 in.)

A Phillips screwdriver and a 11/32-in. nut driver are
required tools for installation. Use Figure 3b and the

Phillips Pan Head

9006022-1

Screws (#6-32 X 3/8 in.)

following procedure as installation guides.

NOTE

‘Unplug the DECwriter and remove paper.

Edge Connector

B-UA-H851-0-0

Lock Washers (#4)

9006688

9007801

Lock Washers (#6)

Flat Washers (#4)

9006655

Flat Washers (#6)

9006653

If not already installed, install the Expander
O ption Mounting Kit (LAXX-LB).
A Phillips screwdriver is the only tool

required for

installation. Use Figure 36 and the following procedure

Refer to Figure 33 for the correct interface cabling
required to integrate the APL Option into the

as installation guides.

existing options.
1.

Using the supplied hardware (1) (four #4-40 X
0.38-in. screws and #4 washers), secure the APL

Unplug the ac power cord and open the top cover.

If not already installed, install the Expander

board in location F on the expander board (Figure

Option Mounting Kit (LAXX-LB).

35).

Refer to Figure 33 for the correct interface cabling

Install the H851 edge connector (2). (Edge con-

required to integrate the Forms Option into the

nector and board are keyed for proper fit.)

existing options.

Insert the two APL ROMs: No. 23087A6 in socket
(3) and No. 23086A6 in (4). Refer to Figure 35

Unscrew the attaching hardware of the bell
speaker. Save the two #6 flat washers and two
#6-32 X 3/8-in. screws but discard the Kep nuts.

for Pin No. 1 locations.

Remove the cover from the DECwriter.

Remove and save the bracket hardware (2) (#8-32

Remove the two front screws (b) and associated
washers from the print head, install the line
indicator (6) as shown, and reassemble the

Attach the speaker to the inside of the top-of-form

removed hardware.

control assembly (1). Use four #6-32 X 3/8 in.

Replace the cover.

the inside as in (4).

X 3/8-in. screw, #8 lock washer, #3 flat washer).

screws, #6 flat and lock washers and secure from

2-21

Figure 35

Installation of the APL/ASCII Dual Character

2-22

OPTION MOUNTING
(LAXX-LB)

F ORM CONTROL
ASSEMBLY BOARD
CP-2106

Figure 36

Installation of Forms Control Option Kit
(LAXX-KV)

2-23

The

top-of-form

cable

has

two

distinct

ends,

differing by the length of the wire leads and type
of push-on connectors. The cable end with the
longer leads and smaller connectors connects to
the top-of-form control assembly and the other
end

the top-of-form

control

module

board.

Connect the two push-on leads to the terminals on

the SET TOP OF FORM switch (3) and plug in the

8-pin connector as shown.

FORMS CONTROL, VERTICAL TABULATION,

AND HORIZONTAL TABULATION OPTION

KIT (LAXX-KY)
The Forms Control, Vertical Tabulation and Horizontal
Tabulation

Quantity

Install the top-of-form control assembly using the

contains

the

Forms

Control

Item

Part Number

Top-of-Form Control

D-AD-7011503-0-0

Assembly

of the bracket.

HT-VT-TOF Module Board

D-CS-M7736-0-1

Top of Form Cable

D-IA-7011516-0-0

Feed the cable under the printer mechanism down

Phillips Pan Head

9006011-1

Screws (#4-40 X 3/8 in.)

through

the access hole and, using the existing

Phillips Pan Head
NON
-

Position the top-of-form control module board (in
Kit. Secure with four #4-40 X 3/8-in. screws and

#4 washers as in (8).
Install the H851

edge connector (7)

9006022-1

Screws (#6-32 X 3/8 in.)

location ““B”) on the Expander Option Mounting

11.

Kit

previously removed #8-32 X 3/8-in. screw and #6
washers as shown in (5). Screw in from the outside

cable clamps, conform the cable as shown.

10.

Option

Option Kit (LAXX-KV) and the following:

Edge Connector

- | B-UA-H851-0-0

Lock Washers (No. 4)

9006688

Lock Washers (No. 6)

9007801

Flat Washers (No. 4)

Flat Washers (No. 6)

9006655

9006653

(edge con-

nector and board are keyed for proper fit) and the

8-pin connector (6) and two push-on connectors as

shown.

12.

Phillips screwdriver

is the

only tool

required

for

installation. Use Figure 37 and the following procedure
as installation guides.

Replace the top cover.

Unplug the ac power cord and remove the top
cover.

Test

After

Installation
—

Perform

the

following

procedure:

not

already

installed,

install

the

Expander

Option Mounting Kit (LAXX-LB).
Energize the DECwriter, load paper, and set the

FORM LENGTH switch to the length of the form
in

inches. Press and

Refer to Figure 33 for the correct interface cabling

release the SET TOP OF

required to integrate the Forms Option into the

FORM pushbutton.

Issue

existing options.

a Form Feed Command (014g). The paper

should feed and stop at a distance that is equal in

Unscrew the attaching hardware of the bell
speaker. Save the two #6 flat washers and two

inches to the switch setting. Repeat this procedure

for two other switch settings, one longer, the other

#6-32 X 3/8-in. screws but discard the Kep nuts.

shorter than this setting. Press the SET TOP OF

FORM pushbutton after changing the setting.

Remove and save the bracket hardware (2) (#8-32

X 3/8-in. screw, #8 lock and flat washers).

Set the FORM LENGTH switch to 3 and press the

SET TOP OF

FORM

Feed

command

Form

Feed command

pushbutton.

(012g)

17 times,

Issue a

then

Line

issue

Attach the speaker to the inside of the top-of-form

control

(014g). The paper should

assembly (1).

Use four #6-32

X 3/8-in.

screws, #6 flat and lock washers and secure from

increment only one line.

the inside as in (4).

2-24

EXPANDER OPTION
MOUNTING KIT
(LAXX-LB)

TOP OF FORM

VERTICAL 8 HORIZONTAL
TABS ASSEMBLY
BOARD

cP-2107

Figure 37 Installation of Forms Control, Vertical
Tabulation, and Horizontal Tabulation Option Kit
(LAXX-KY)

2-25

The

top-of-form

cable

has

two

distinct

ends,

Set the FORM LENGTH switch to 3 and press the

differing by the length of the wire leads and the

SET TOP OF FORM pushbutton. Issue Line Feed

size of the push-on connectors. The cable end with

(012g) 17 times, then issue a Form Feed Command (014g). The paper should increment only

the longer leads and smaller connectors connects
to the top-of-form control assembly and the other

end to the HT-VT-TOF
the

two

one line.

module board. Connect

push-on leads to the terminals on the

After ensuring

correct operation of the Forms

bottom of the SET TOP OF FORM switch (3) and

Control

plug in the 8-pin connector as shown.

paper. (Set switch at 11; press pushbutton.)

Install the top-of-form control assembly using the

Issue an “A” (101g).

function,

set the TOF for 11-in. form

previously removed #8-32 X 3/8-in. screw and #8
washers as shown

in (2). Then secure with two

Issue 013g; the DECwriter will

#6-32 X 3/8-in. screws and #6 washers as shown in

line feed 11

in.

Issue a “B” (1028).

(5). Screw in from the outside of the bracket.

Issue 012g 10 times, issue 033g and 063g then
Feed the cable down through the access hole and,

issue a ““C"” (103g).

using the existing cable clamps, conform the cable

as shown.

Issue 014g. Issue a “D" (104g). Manually turn the
paper back until the print head aligns at the line

10.

Position the HT-VT-TOF module board (in loca-

where "“B” was printed.

tions A and B) on the Expander Option Mounting

11.

Kit. Secure with two #4-40 X 3/8-in. screws and

Issue 013g, issue an “E" (105g) (will print next to

#4 washers as in (8).

previously printed ““C"').

Install the H851 edge connector (7) in location
A

10.

(edge connector and board are keyed for proper

Issue 013g, issue an ’F” (106g) (will print next to
previously printed “D").

fit) and the 8-pin connector (6) and two push-on
connectors as shown.

11.

Issue

033g and

064g, then

manually turn the

paper back to the line with *’B’’ on it.

NOTE

12.

Only one H851 edge connector is needed.

12.

Issue 013g; the print head will align on the line
containing “D" and “'F."”

Replace top cover.

13.

Issue 012g, 015g, and 011g. The print head will
move to the right margin (column 132).

Test

After

Installation—

Perform

the

following

14.

Issue 01 g, then issue 040g eight times.

15,

Issue 033g and 061g, then issue an A" (101g).

procedure:

Load paper, energize the DECwriter, and set the
FORM

LENGTH

switch

to correspond

16.

to the

Issue 040g eight times; issue 033g and 061g; issue

a’'B” (1028).

length of the form in inches. Press and release the

SET TOP OF FORM pushbutton.
17.

Issue

any

character,

then

issue

Form

Issue 040g eight times; issue 033g and 061g; issue

a “C” (103g).

Feed

command (014g). The paper should feed and stop
at a distance that is equal in inches to the switch
setting.

Repeat

this

procedure

for

two

switch settings, one longer, the other shorter than

this

setting.

Press

the

SET

TOP

18.

Issue 0318; issue 0128.

19.

Issue 011g;issue a “D" (104g).

20,

Issue 011g; issue an “E” (105g).

other

FORM

pushbutton after changing the setting.

2-26

lssue 011g; issue a “F” (106g).

22.

lssue 011g; the head will move to column 132

The printed characters will be in two lines with the
top line one character space 10 the right of the
second line.

23.

Install the two H851 edge connectors (2). Edge
connectors and board are keyed for proper fit.

21.

lIssue 031g; issue 011g twice, then issue 020g ten
times.

Test After Installation — Load paper and energize. With
jumper W1 not cut out, a Carriage Return command

(015g) will generate a line feed. With W1 cut out, a

Carriage Return command will not produce a line feed.

SELECTIVE ADDRESSING OPTION KIT (LAXX-KW)

24.

Issue 011g; issue a “G" (107g).

The Selective Addressing Option Kit contains the

25.

Issue 011g; issue an “H'"" (108g). The characters
G and “H"” will overprint on the previously

Quantity

printed “E" and “F.”

1
1

Issue 033g and 062g; issue 031g; issue O11g. The
print head will move to column 132. The test is

26.

’

following:

completed.

Part Number

Item

Selective Addressing Board |D-CS-M7737-0-1
B-UA-H851-0-0
Edge Connector
Phillips Pan Head Nylon

9006401-04

El1A Interface Cable

C-1A-7010489-0-0

Screws (#4-40 X 0.38in.)

AUTOMATIC LINE FEED OPTION KIT (LAXX-LA)
The Auto Line Feed Option Kit contains the following:

Part Number

Item

Quantity
1
2
3

Auto Line Feed Board | D-CS-M7738-0-1
B-UA-H851-0-0
Edge Connector
9006011-1
Phillips Pan Head

3
3

Flat Washers (#4)

Screws (#4-40 X 0.38 in.)
Lock Washers (#4)

A Phillips screwdriver is the only tool required for
installation. Use Figure 39 and the following procedure
as installation guides.

Unplug the ac power cord.

If not already installed, install the Expander
Option Mounting Kit (LAXX-LB).

9006688
9006655

Refer to Figure 33 for the correct interface cabling
required to integrate the Selective Addressing

Option into the existing options.

A Phillips screwdriver is the only tool required for
installation. Use Figure 38 and the following procedure

Using the supplied hardware (3) (two #4-40 X

0.38-in. screws), secure the Selective Addressing
board in location E on the expander board.

as installation guides.

Unplug the ac power cord.

If not already installed, install the Expander

Install the H851 edge connector (2) Edge connector and board are keyed for proper fit.

Option Mounting Kit (LAXX-LB).

If the Selective Addressing Option is to be used

with the EIA Interface Option (LAXX-LG), the

Refer to Figure 33 for the correct interface cabling
required to integrate the Auto Line Feed Option

interface cable (1) should be connected as shown
(lug G on the EIA board to lug GND on the

into the existing options.

Using the supplied hardware (1) (three #4-40 X

0.38-in. screws and #4 washers), secure the Auto
Line Feed board in locations C and D on the
expander board. As shown, one of the mounting

Selective Addressing board).

Test

After

Installation— Perform

the

following

procedure:

holes should not be secured.

2-27

Properly interface the DECwriter with the Selective Addressing Option to a processor or another

NTTIING
U
O
U
M
O
M
N
O
OPTI
)

X-

A
3

@, /,fi -N, |
®
2

)BOLAOGRlDC

AUTO LINE FEED
E

Figure 38

Installation of Automatic Line Feed
Option Kit (LAXX-LA)

<
-

——

EIA OPTION
(LAXX-LG)

SELECTIVE

ADDRESSAING

M7728
LOGIC BOARD

EXPANDER

OPTION MOUNTING
KIT (LAXX-LB)

CP-2109

Figure 39

Installation of Selective Addressing
Option Kit (LAXX-KW)

2-29

DECwriter without this option. (EIA interface or
any other type

12.

On terminal B, type CTRL B, then A’s unique

of communications interface is

address code.

acceptable.)
13.

On terminal B, type any characters; A does not

Energize both terminals; set both to line mode and

receive.

to the same baud rate.

On terminal B, type CTRL C, then A’s unique

14.
NOTE

code again. Now type CTRL B.

In the following procedure, the terminal with the
Selective Addressing Option is designated as A"’

Typing on B causes A to print.

15.

and the terminal without the option designated
AUTOMATIC ANSWERBACK OPTION KIT

(LAXX-KX)

Steps 3 through 6 set up terminal A as a broadcast
selected slave.

The

Transmit from terminal

Auto

Answerback

Option

Kit

contains

the

following:

B: terminal A does not

receive.

Quantity

On terminal B, type CTRL G, then type CTRL B.

Terminal A can receive from B.

On terminal B, type CTRL D.

Item

Part Number

Auto Answerback Board | D-CS-M7733-0-1

Edge Connectors

Phillips Pan Head

B-UA-H851-0-0

F 900601 1-1

Screw (#4-40 X 0.38 in.)

Transmit from B; terminal A does not receive.

Lock Washers (#4)

1 9006688

Flat Washers (#4)

9006655

NOTE
Steps 7 through 9 set up terminal A as a group

selected slave.

Phillips screwdriver

is the

only

tool

required

for

installation. Use Figure 40 and the following procedure
as installation guides.

On terminal B, type the group select code that was
entered into the switches on the Selective Address-

ing circuit board installed in terminal
A.
On

terminal

B, type CTRL B. Terminal A can

installed,

install

the

Expander

required to integrate the Auto Answerback Option

into the existing options.

NOTE
Steps 10 and 11 set up terminal A as a uniquely

Using the supplied hardware (1)

selected slave.

(four #4-40 X

0.38-in. screws and associated washers), secure the
Auto Answerback board in locations C and D on

On terminal B, type A’s unique select code that
entered

already

Refer to Figure 33 for the correct interface cabling

On terminal B, type CTRL D.

was

not

Option Mounting Kit (LAXX-LB).

receive from B.

10.

Unplug the ac power cord.

the expander board.

into the switches on the Selective

Addressing circuit board installed in terminal A.

Install the two

H851 edge connectors (2). Edge

connectors and board are keyed for proper fit.

11.

terminal B, type CTRL B. Terminal A can

receive.

Enter the answerback message using the 7 slide
switches
NOTE

Steps

through

set

on the 20 character switches.

Use the

standard ASCII code. The ON switch position is
up terminal

A as a

the asserted state (high) and slide switch No. 1

uniquely selected slave with add-on capability.

corresponds to b1 of the 7-bit character.

2-30

<0 y ’,l”:"’ :
25502

LOGIC

Z 2P
-

A
/

2 &

BOARD

EXPANDER

OPTION_MOUNTING
KIT (LAXX-LB)

2
"

TOMATIC

ANSWERBACK

BOARD

N
1111111

Figure 40

Installation of Automatic Answerback
Option Kit (LAXX-Y)

2-31

Depending on the presence of these jumpers, any of the

Test After Installation — A received ENQ command

following four terminal conditions produce the output

(0058) will generate the answerback message.

signals,

EIA INTERFACE OPTION KIT (LAXX-LG)

Paper Out

Switch to Local Mode
The EIA Interface Option Kit contains the following:

Power-up Sequence Not Completed
Terminal Power Switched Off

Quantity

Item

Part Number

EIA Interface Assembly

The

these

jumpers

produce the

following

| D-1A-7011828-0-0

Phillips Pan Head

9006037-1

Screws (#8-32 X 0.38 in.)

status

outputs for any of the above conditions.

EIA Output Signal

Lock Washers (#8)

9006690-00

Flat Washers (#8)

Out

None

9006660-00

Out

230 ms BREAK on Transmit

Out

Phillips screwdriver

Data Line

is the

only

tool

required

for

installation. Use Figure 41 and the following procedure

DATA TERMINAL READY

]

Disconnect

as installation guides.
NOTE

Unplug the ac power cord.

The EIA board is shipped with both jumpers installed.

Disconnect the 20 mA interface input cable from

The

J3 on the M7728 logic board.

TERMINAL

NOTE

CARRIER

DETECT

signal

can

cause

DATA

READY disconnect regardless of jumper

presence.

Remove the two screws that

hold the 20 mA

interface cover plate to the floor of the cabinet
and remove the complete harness assembly.

Test After Installation — Send EIA data into the DEC-

writer; the printout should verify a correct installation.

COMPRESSED FONT OPTION KIT (LAXX-KJ)
4,

Insert the connector end (1) of the EIA interface
cable up through the hole in the floor, then insert

the EIA circuit board assembly (2).

Plug the connector (1) into J4 of the M7728 logic

board.

Compressed

Quantity

Using the #8-32 X 0.38-in. screws and washers (3)
supplied, secure the EIA assembly.

The

Connect the input end of the EIA cable assembly

Font

Option

Kit

contains

the

following:

Item

Part Number

30-Tooth Timing Pulley | 1212446-00

15-Tooth Timing Pulley | D-MD-7414908-0-0

Pulley Clamp

C-MD-7414951-0-0

Timing Belt

1211583-02

Socket Head Cap Screw | 9006350-8

(#10-32 x 1in.)

to the signal source.

Hex Socket Set Screw

9007722-10

(#1/4-20)
The EIA circuit board has two wire jumpers that allow
selection of the type of BREAK and DATA TERMINAL

READY signals that are output by the EIA interface.

2-32

Kep Nuts

9006565-00

Right-Hand Spacer

C-MD-7415010-0-0

Channel Strip

9007036-00

The following tools are required for installation: socket
head wrenches, Phillips screwdriver, feeler gauges, and a

torque-type Phillips screwdriver. Use Figures 42 and 43
and the following procedure as installation guides.

Using a socket head wrench, loosen the set screw
in the pulley clamp (5) until the existing timing

pulley (3) can be removed from the motor shaft.
This pulley clamp can be discarded.

Remove ac power from the D ECwriter and remove

: housing.
:
the top plastic

(4)
clamp
pulley
L oosen the
he set set screw iin
n the
the other
oth
lley
c
then remove and save this pulley.

Remove the ribbon from the print head area.

Press in against the spring as in 1, Figure 42, to

remove belt tension, then slide the timing belt (2)

off both existing pulleys (3) and (4).

Figure 41

Assemble the cap head screw and Kep nuts, then

insert through the left side bracket as shown in

(6).

¢/sz111

Installation of EIA Interface Option Kit

(LAXX-LG)

2-33

CP-2113

Figure 42

Installation of Compressed Font Option Kit

(LAXX-KJ)

2-34

6-32 SCREWS TO

PRINT BAR

0.012

FEELER GAUGE

PRINT HEAD

BE TIGHTENED 10 + 2

IN./LBS. OF TORQUE

CAUTION

ENSURE THAT FEELER GAUGE IS INSERTED
BETWEEN THE PROTRUSIONS ON THE
PRINTHEAD. FAILURE TO DO SO WILL RESULT
IN IMPROPER CLEARANCE AND SHORTEN
THE LIFE OF THE PRINTHEAD.

7393-06

Figure 43

Print Head Adjustment

Install the new 30-tooth timing pulley on the
ribbon drive shaft (4). The side of the pulley with

head and replace the existing timing belt with the
new belt supplied. Reassemble the print head but

of the machine. Position the pulley so that there is

10. Set the Carriage Adjustment lever to the minimum

do not tighten the four mounting screws.

the flange should be positioned toward the front

9/32-in. clearance between the back of the pulley

gap position (detent closest to the print bar).

and the mounting hardware for the shaft bearing.

Secure the new 30-tooth pulley using the previously removed pulley clamp.

CAUTION

It is possible to position the Carriage Adjustment
lever beyond the minimum gap position. If this is

Install the new 15-tooth pulley on the motor shaft
and secure, using the new pulley clamp provided.

done, the correct head gap adjustment cannot be

made.

Remove the four screws (7) that secure the print'
2-35

CP-2115

Figure 44

Installation of 20 mA Cable Option Kit

(LAXX-LH)

2-36

Adjust the print head gap with the carriage in the

center of travel. Place a 0.012-in. flat feeler gauge
between the print head jewel and the front surface
of the print bar (parallel to the print bar). Push the

print head snug against the feeler (Figure 43).

20 mA CABLE OPTION KIT (LAXX-LH)
The 20 mA Cable Option Kit contains the following:

Ensure that the feeler gauge rides between the
protrusions on the print head. A feeler gauge with
a width of 7/16 in. (or less) is needed to fit
between the protrusions. Do not exert excessive
force on the print head when making the adjustment: it will cause the carriage shaft to bow,

12.

C-MD-7413216-0-0
Cover Plate
9006037-1
|
Screw
Head
Pan
Phillips
#8-32 x 0.38 in.)

1
2

- Flat Washers (#3)
Lock Washers (#8)

A Phillips screwdriver is the only tool required for
installation. Use Figure 44 and the following procedure

torque.

as installation guides.

CAUTION

Disconnect and remove any previously connected

data input line.

Insert the connector end (4) of the 20 mA cable
up through the access hole in the floor and
connect it to J3 on the M7728 logic board.

damaged.

Move the print head to the extreme right and left.
Using a feeler gauge, check each position for no
less than 0.010 in. of clearance between print head

Secure the cover plate (3) using the two pan head
screws and associated washers (2). Position the

and print bar.
14.

cable (1) as shown.

Recheck the gap at the center. The gap should be

no greater than 0.014 in, If it is, perform steps 10

Connect the input end of the 20 mA cable

through 14 again.
15.

16.

17.

9006660
9006634

Tighten the #4 (6-32) screws to 10 £2 in./Ib of

Do not apply more than the recommended torque
when tightening the print head screws or the
moulded inserts in the carriage assembly may be
13.

BCO5F-15

Cable

resulting in more than 0.012-in. of clearance.

Part Number

Item

Quantity

assembly to the signal source.

Press against the ribbon drive assembly spring and
install the new timing belt on both pulleys.

Adjust the cap head screw (6) so that the space
between the end of the screw and the ribbon drive
assembly bracket is between 0.005 and 0.010 in.
Rethread the ribbon, replace the plastic housing

Test After Installation — Send data into the DECwriter;
the printout should verify a correct installation.

20 mA (DEC 10) CABLE OPTION KIT (LAXX-LK)

and top cover, insert paper, and apply power.
NOTE

LA35s with serial number 5568 and earlier require
spacers as shown in (8) and (9). The right spacer
(8) is inserted over the end of the side bracket and

The 20 mA Cable Option Kit contains the following:
Quantity
1

between the bracket and the carriage shaft. When
loosening the socket head cap screw at the right
end of the carriage shaft, do not allow the shaft to

Item

Part Number

Cable (2838 Connector to

D-Al-7009212-1-0

Mate-N-Lok Connector)

turn.

Cover Plate

Phillips Pan Head Screws | 9006037-1

C-MD-7413216-0-0

(#8-32 X 0.38 in.)

The channel strip spacer (9) slips over the left side
bracket, as shown, to prevent the timing belt from

Flat Washers (#8)

9006660

Lock Washers (#8)

9006634

chaffing.

Test After Installation — The DECwriter will print 132
characters in a line that is 8 in. wide. ‘All other normal
functions are unaffected.

Phillips screwdriver

is the only

tool

required

for

installation. Use Figure 45 and the following procedure
as installation guides.

CP-2115

Figure 45

Installation of 20 mA (DEC 10) Cable

Option Kit (LAXX-LK)

2-38

The column pointer (2) and its associated spacer
are manufactured as a single unit. The spacer is
attached to the side of the pointer by a thin web.

Disconnect and remove any previously connected

data input line.

Before installing the pointer, these two parts must

Insert the connector end (4) of the 20 mA cable
up through the access hole in the floor and

be separated at this web. Fold the spacer down

connect it to J3 on the M7728 logic board.

under the pointer to break apart.

Secure the cover plate (3) using the two pan head
screws and associated washers (2). Position the

Install the column pointer and spacer on the line
indicator using the #4 screw, lock washer, and flat
washer (3).

cable (1) as shown.

Connect the input end of the 20 mA cable

NOTE

If after installing the print window, the green and

assembly to the signal source.

red positioning lines on the column pointer seem

to be too high above the lip of the window,
remove the spacer from beneath the column

Test After Installation — Send data into the DECwriter;
the printout should verify a correct installation.

SCALE,

POINTER,

pointer.

AND WINDOW OPTION KIT

The light shield (4) is a flat-black surface that
minimizes glare and reflections. The shield mounts
on the sloped surface of the top cover. Peel off the

(LAXX-LN)

The Scale, Pointer, and Window Option Kit contains the

backing and position on the cover.

following items:

Quantity
1

1
1

Part Number

The column scale (b) adheres to the lip on the

Column Scale

C-1A-7414986-0-0

of Figure 46 details the placement of the scale on

Column Pointer

C-MD-7415409-0-0

Light Shield

C-MD-7415255-0-0

Item
Line Indicator

1212009-00

Print Window

Phillips Pan Head Screw | 9006011-1

Lock Washer (#4)

(#4-40 X 3/8 in.)
Flat Washer (#4)

the window lip.

C-MD-7414953-0-0

print window (6) as shown in Figure 46. Insert A

9008172

The print window (6) snaps into place in the top

Insert B of Figure 46 shows the proper alignment
of the line indicator and printed characters after

five Ns have been printed and a backspace

9006632

occurred. The right-hand vertical ascender of the
last N printed should align over the right edge of
the line indicator. If necessary, loosen the two

mounting screws and correct the alignment.

A Phillips screwdriver is the only tool required for
installation. Use Figures 2 and 46 plus the following
procedure as installation guides.

cover opening.

NOTE

After installing the column scale (5) and the

Unplug the ac power cord, remove the paper, and

column pointer (2), a horizontal adjustment may

remove the top cover.

be required. The green indicator line on the

column pointer should align with a corresponding

Install the line indicator on the print head

line on the column scale before the last character
visibility (LCV) move takes place. If alignment is
performed after the last character visibility move,

assembly using the two front Phillips screws.
Remove the screws, insert the line indicator
beneath the ribbon (do not interfere with the
ribbon’s path), then secure with the screws.

the red line on the column pointer is used.

2-39

COLUMN
SCALE

POSITIONING

LEFT-HAND
EDGE

_PROPER

L~ ALIGNMENT

NNNNN

LINE
INDICATOR

cpP-2117

Figure 46

Installation of Scale, Pointer, and Window

Option Kit (LAXX-LN)

2-40

DF11 ADAPTOR KIT (LAXX-KH)

The DF 11 Adaptor Kit contains the following:

Item

Quantity

Adaptor Bracket
Wired Assembly
Cable Assembly

1
1
1

Part Number

NOTE

Ensure that the *“O’’ ring is positioned between the
knob and the sleeve (5, Figure 48).

as installation guides.

Secure the adaptor bracket (1) to the cabinet door
as shown. Use two #6-32 screws.

Attach the wired assembly (2) to the bracket with

The cable assembly (4) should be soldered to the

Connect the cable connector to J4 on the logic

Test

Insert the new cover onto the D ECwriter. Press the
acoustical coupler cable down through the rear

Connect the cable end into the EIA connector (J4)
on the logic board.

wired assembly as in Figure 47.

After

Installation —

Perform

the

following

procedure:

Insert the DF11 communications option into the
connector in the wired assembly (2) and secure the
other end to the adaptor bracket using the two
small screws supplied (#2-56). The screws insert
through the hollow rivets in the DEC-CHIP handle
and secure into the adaptor bracket at (5).

Test After Installation— Refer to the
procedures for the DF 11 module installed.

Replace the knob on the tractor shaft and secure

with the screw and washers.

access hole as shown in Figure 49.

a #6-32 screw (3).

board.

After removing the Paper Advance knob from the
tractor drive shaft (4, Figure 48) remove and
discard the sleeve (5), then slide two ““O” rings (3,
Figure 48) all the way onto the shaft.

A Phillips screwdriver is the only tool required for
installation. Use Figure 47 and the following procedure

Remove the Paper Advance knob (2, Figure 48) by

unscrewing the #6 screw (1, Figure 48) from the
center of the knob.

C-MD-7413104-0-0
B-1A-7010599-0-0
C-1A-7010598-0-0

Phillips Pan Head Screws | 9006001-01
(#2-56 X 1/4 in.)
Phillips Pan Head Screw | 9006023-01
(#6-32 x 7/16 in.)

Unplug the ac power cord and remove the existing
top cover.

Set for power on, on-line, and correct baud rate.

Using a telephone, call the sending system and,
after hearing the carrier, place the handset into the
muff assembly.

NOTE

checkout

The cord end of the handset is placed in the muff
with the ““dot’”” and/or word “CORD’ next to it.

ACOUSTICAL COUPLER OPTION KIT (LAXX-LM)

The Acoustical Coupler Option Kit contains a new cover

(D-AD-7012144-0-0) that replaces the existing LA35
cover and a rubber ““O" ring (9009793-00) that fits over
the tractor drive shaft to minimize mechanical noise
generation during a paper advance. A Phillips screwdriver

The carrier light illuminates within 5 seconds and
then normal system operation can be performed.
NOTE

Prior to removing the telephone handset from the
muff assembly, place the DECwriter in the local
mode. This action prevents the disconnect noise

is the only tool required for installation. Use Figures 48

and 49 plus the following procedure as installation

from causing printing of random characters.

guides.

2-41

BB2 (BLUE)-12V

BD1 (VIOLET) RCVD
DATA TTL

e .

BN2 (GREEN) +12V
"

BT1

(BLACK) GND

o Bv2 (YELLOW) XMTR
DATA TTL

cP-2118

Figure 47

Installation of DF11 Adaptor Mounting Kit
(LAXX-KH)

2-42

CCCCCCC

Figure 48

Installation of “’O”" Ring on Tractor
Drive Shaft

CARRIER INDICATOR

TELEPHONE

HANDSET

Figure 49

Installation of Acoustical Coupler Option Kit
(LAXX-LM)

2-43

SECTION 3

COMMON INFORMATION

LOADING PAPER AND CHANGING THE RIBBON
LOADING PAPER

The LA36/LA35 can accept multipart forms, with
widths from 3 to 14-7/8 in. When loading new forms, it
is necessary to perform two adjustments:

Paper Positioning

Impression Adjustment

In addition, there is a horizontal positioning and vertical
positioning adjustment. The horizontal positioning
adjustment allows the paper to be slightly shifted left or
right. This procedure is especially useful when typing on
preprinted forms with defined horizontal zones. The
vertical positioning adjustment enables the paper to be
adjusted vertically. Once these adjustments have been
performed, reloading paper becomes quick and simple,
requiring a minimum of interruption.

LOADING NEW FORMS
PAPER POSITIONING PROCEDURE

Set the POWER switch to OFF.

Lift the cover.

Place the tractor-feed paper on the floor between

the legs of the LA36/LA35. (The term tractor-feed
refers to the holes on either side of the paper.)
NOTE

Ensure that the leading edge of the forms is
directly below the parallel to the feed slot.

7666-14

Open the left tractor cover so that the tractor pins
are exposed.

Move the Carriage Adjustment lever to the highest

number (toward operator).

CARRIAGE

ADJUSTMENT
LEVER

7666-16

Feed the paper through the load channel under the
terminal and align the left paper margin holes over
the left tractor pins.
Close the left tractor cover.

7666-33

Loosen the Tractor Adjustment knob on the right
tractor about 1/2 turn.
k4

Open the right tractor cover and slide the tractor
to a position where the holes on the right paper
margin align directly over the tractor pins.
Close the tractor cover.

NOTE

Ensure that the paper does not pull against the
tractor pins or bow in the middle.

Tighten the tractor adjustment, and proceed to the
impression adjustment.
7666-35

3-3

IMPRESSION ADJUSTMENT

NOTE
The

Carriage Adjustment lever is normally set

forward (to notch number 1) for single thickness
paper. The following procedure is applicable only
to multipart forms.

Set the POWER switch to OFF.

Set the Carriage Adjustment lever to the number
corresponding to the number of parts in the form.

Turn the Paper Advance knob counterclockwise
while moving the Carriage Adjustment lever forward one notch at a time until the paper smudges;

7666-3

then move the lever back one notch at a time until
the paper no longer smudges.

Set

the

POWER

switch

and

resume

operation.

NOTE
If the impression is unsatisfactory due to a worn

ribbon, perform the ribbon installation procedure.
An indication of a worn ribbon is that the first
copy in a multipart copy is poor but the remaining
copies are good.

HORIZONTAL POSITIONING ADJUSTMENT

The horizontal positioning adjustment enables the paper

to be shifted left or right [1/2 in. (1.27 cm) max.].

Shifting the paper provides a simple means of aligning
the type within the appropriate columns on the paper.
1.

Set the POWER switch to OFF.

Lift the cover and loosen both Tractor Adjustment

o o0

knobs about 1/2 turn.

Move the tractors the desired amount (1/2 in.

max.) to have characters type in the appropriate

TRACTOR ADJUSTMENT KNOBS

columns.

}

7666-10

Tighten the Tractor Adjustment knobs.
NOTE

Ensure that the paper does not pull against the

tractor pins or bow in the middle.

FINE VERTICAL POSITIONING

For fine vertical positioning, press in and turn the Paper

Advance Knob.

PUSH IN HERE
AND TURN TO
ADJUST PAPER
VERTICALLY

PAPER
ADVANCE

KNOB

7595-4

RELOADING PAPER
1%

Set the POWER switch to OFF.

Lift the cover.
Place the tractor-feed paper on the floor between

the legs of the LA36/LA35.
Open both tractor covers so that the tractor pins
are exposed.

NOTE
Ensure

that

the

leading edge

of the forms

directly below and parallel to the feed slot.
Feed the paper through the load channel under the
terminal and align the paper holes over the tractor
pins.

Close the tractor covers.

7666-33

RIBBON INSTALLATION

The printer ribbon should last for 16 to 20 hours of actual printing at 30 characters/second (about 2 million characters).
and

After 12 hours, or when the print density becomes too light, remove both ribbon spools from their drive spindles
turn the whole assembly over so that the previous lower edge of the ribbon is now on top. After rethreading the ribbon,
another 8 hours (approx.) of printing time is possible before the ink is completely used. At that time, the ribbon must
be replaced by removing both spools and unthreading the ribbon. Replace with a new spool and ribbon assembly
(36-10558) and an empty spool. (One of the old spools may be used if desired.)
NOTE

Use only DIGITAL-recommended ribbons (Part No. 36-10558).
Use

of other ribbons can cause damage and void machine

warranty.

Set the POWER switch to OFF and lift the cover.

Record the setting of the Carriage Adjust leveér.

Move the Carriage Adjust lever to the highest
number.

Remove the ribbon spools and ribbon. Save one

spool to be used with the new ribbon.

7666-32

Connect the hook on the end of the ribbon to the empty
spool.

7666-17

Wind 10 turns of ribbon on the empty spool.

RIVET
7666-21

7622-22

CARRIAGE LEVER ADJUSTMENT

CP-2006

Take up the slack in the ribbon by turning the free

Place the full spool on the left spindle and turn
clockwise until it drops into position.

moving spool.

Return the Carriage Adjust lever to its original

Guide the ribbon around idler spool A through
guide B, and around the outside of idler spools C

setting.

through E.

Guide around the front of head F and idler spools
G through 1.

NOTE

The rivet located on the ribbon must be on the
spool or between the spool and the Direction

Guide the ribbon through slot J (directior
changing guide) and around idler spool K.

Changing guide.

Ribbon can be threaded in the opposite direction

Turn the spool clockwise until it drops into

(from K to A).

position.

3-9

DECwriter INTERFACE INFORMATION

INTERFACE DESCRIPTION

=
NOTE

100ms

The LA35 and LA36 have identical interfaces. However,

the LA3b utilizes only the receive circuitry.

START-LSB

There

are

three

the

DECwriters:

Kit;

LAXX-LK,

interface

option

LAXX-LH,
20

kits
mA

available
Cable

—>|

[

BITS

'Wl

110 BAUD

|
Y

[

STOP

]

[ | I | | I I ]

mA Cable Option Kit (DEC-10):

or 2 of this manual for installation instructions for

MSB

BITS

r—fir'

Option

PARITY

DATA

BIT l‘

for

LAXX-LG, EIA Interface Option Kit. Refer to Sections
1

|<— 9.09ms

these interfaces.
|l

|
>

66.6ms

INTERFACE SPECIFICATIONS

The interface specifications for the DECwriter serial 20

mA current loop are shown below:

‘

[
START - | sB

Transmitter (LA36 only)

Open circuit voltage

Max.

5.0V

40 V

->l

PARITYq
1
msB
STOP

BITS

f-Hl '

turned off.

Min.

8
DATA

BIT l_

Passive, isolated, goes to Mark state when power is

[

]

BIT

NCTTY

]

___j

150 BAUD

|<— 6.66ms

(of circuit being driven)
Voltage drop, Marking

o5V

20V

{f-

Spacing current

0.4 mA

2.0 mA

33.3 ms

Marking current

20 mA

80 mA

'|
|

!
l

START LSB

Receiver

BIT

Passive, isolated

Max.

Voltage drop, Marking

1.2V

2.7V

BITS

Spacing current

0.0 mA

3.0 mA

Marking current

15 mA

80 mA

“l

lr N I R
|

]

'\A
!

]

4-conductor LAXX-LH or LAXX-LK

(Cable extension up to 1500 ft is permitted)

Receiver/Transmitter (LA36 only)
Active, half-duplex
Min.

Max.

Voltage drop, Marking

1.7V

4.7 V

Spacing current

0.0 mA

3.0 mA

Marking current

15 mA

80 mA

-J

3.
cP-1177

Serial Interface Timing Diagram

Cable

r300 BAUD

BIT

]

DABTA MSngY S'I!O:D

e ]
Min.

PROGRAMMER'S GUIDE

LA36 PROGRAMMER’S INFORMATION

r CEm T OO D

{

NOTE

All information in this section is applicable to the LA35,
with the exception of keyboard operations. This is due

to the fact that the LA36 and LA35 receive operations

OEmmD

D 1

[

i'<

PRINT
HEAD

i
L

i
e e e e e e e e = o =J
D CEED

BUFFER

COEEm»

RECEIVER

INCOMING
DATA

GEED SEED CEED onmn CErmD TRTD 2CEED oD ’

TRANSMITTING CHARACTERS AND COMMANDS
The only way an operator can transmit data is by typing
keys on the keyboard. The 7-bit ASCIl equivalent of
each key is transmitted the instant a key is depressed.

TRANSMITTER

KEYBOARD

_ouTcoinG
DATA

L— o T D O O U Conmd OEuED OEmiD D J
LA36

CP-1166

Normally, the DECwriter prints characters and processes
commands as fast as they are received. The one
exception is the RETURN operation (moving the print
head back to the left margin). RETURN can take longer
than the time interval between two successive data
inputs. This is a normal condition for mechanical
devices, which are slower than electronic signals. The
normal programming practice is to compensate for this

SPECIAL COMMAND KEYS
CTRL Key

Holding down the CTRL key changes the ASCII code
transmitted when another key is typed in that it forces
bits 6 and 7 to 0. For example, the ASCII code for the
letter ‘“g”" is 147 (1100111)

\ N\
\

e 2 O

|
'

r coan

and baud rates are identical.

D CEmED o

time lag by using filler characters (such as ASCI11 000) to

bits 6 and 7

take up slack time.

Holding down the CTRL key and typing the “G" key
transmits the ASCII code 007 (00@1 11)
|

In the LA35 and LA3G6, it is necessary that a single
nonprinting, nonspacing character be sent after a
carriage return or that carriage return is followed by
33.33 ms of idle {marking) line time.

bits 6 and 7 are forced to O

The CTRL key enables the LA36 operator to transmit
all ASCII control codes (000—037).

The nonprinting, nonspacing character requirement is
fulfilled by the line feed, (LF) code which normally will
follow CR. The LF function will be executed simulta-

BREAK Key

neously with CR.

The BREAK key is commonly used to manually
interrupt the flow of data coming to the LA36. The
function of the BREAK key is to cause the transmitted
data signal from the LA36 to go to the space condition
while the BREAK key is depressed. If the LAXX-LG
EIA/CCITT interface is installed, then the BREAK signal

Additional CR characters sent without an intervening
character that causes printing or spacing will be disregarded.

The following table lists the 7-bit ASCII codes used by
the DECwriter and indicates the operations performed
by the printer. Note that some ASCII codes, though
generated by the keyboard, are not recognized by the

is limited to approximately 230 ms.

RECEIVING CHARACTERS AND COMMANDS
The DECwriter receives commands as well as characters
to be printed in the form of 7-bit ASCIl codes.

printer.

3-11

KEYBOARD OPERATIONS

To Transmit, Type Key(s)

ASCII Code

Character

000

NUL

001

SHIFT* | CTRL*

RECEIVE OPERATIONS
Character

CHAR

Printed

None

SOH

002

STX

003

ETX

004

EOT

005

ENQ

006

ACK

None

007

BEL

BELL

Sound Alarm Bell

010

011

012

013

None

014

None

015

016

017

020

DLE

021

DCI

022

DC2

023

DC3

024

DC4

025

NAK

026

SYN

027

ETB

030

CAN

Action/Description

None

Backspace one position

None
Advance Paper one line

Move print head to left margin

None

031

" EM

032

SUB

033

ESC

[

034

035

036

037

usS

—

None

040

space bar

Blank Space

|
None
Print character, move print head
one position to the right.

*A check in this column indicates the key (SHIFT or CTRL) that must be held down while the character key is typed.

If both keys are checked, then both keys must be held down.

3-12

RECEIVE OPERATIONS

KEYBOARD OPERATIONS

To Transmit, Type Key(s)

042

043
044
045

046
047
050

051

052
053

Printed

Action/Description
Print character, move print head

[X)

o|lo|N|lo|loa|sr|lw|lNw]=lo]|~

041

Character

CHAR

Oololvw|lo|la|lr|lw|N]|=]lO0
]|~

Character

R L L L B R L L LS L Y S

ASCII Code

SHIFT* | CTRL*

one position to the right.

054
055

061
062

063
064

065

066
067
070

071

072

073
074

060

057

Olo|vw|lo|lo|srjw|[NN]l=|o|~

056

103
104

102

O|0O|®@TM|>»|®

101

)

100

O|O|®|>|®

077

076

O|jO0O|@|>|®

075

v
Print character, move print head
one position to the right.

* A check in this column indicates the key (SHIFT or CTRL) that must be held down while the character key is typed.
If both keys are checked, then both keys must be held down.

3-13

KEYBOARD OPERATIONS

To Transmit, Type Key(s)

123
124

125

126
127

130
131

132
133
134
135

136

] &= =«

Print character, move print head
||
m

122

one position to the right.

= |—IN|<|x|=s|<|c|A|v|x|o|v|c|z|z2||x]|=

121

Action/Description

120

Printed

||
TMm

116
117

Character

o_./,-—.N_<><§<C—-|mmO-UOZ§|—-K"-

115

CHAR

114

& &

113

112

=" |—[N|<|X|s|<|c|H|w|x|lo|lv9|o|z|2||R]|«

111

] & &

110

| CTRL*

S & & &

107

106

105

SHIFT*

Character

<|<

ASCII Code

RECEIVE OPERATIONS

150

147

o
| o
o N I o]

= 1 D

|
192

146

|«Q

145

—h

144

=5 | QO

143

I|OMmM MO0l

142

141

Q|
o

140

137

V
Print character, move print head
one position to the right.

*A check in this column indicates the key (SHIFT or CTRL) that must be held down while the character key is typed.
If both keys are checked, then both keys must be held down.

3-14

KEYBOARD OPERATIONS
To Transmit, Type Key(s)

RECEIVE OPERATIONS
Character

CHAR
I

Printed
i

K
L

k
l

162

163

164

165

166

167

170

171

172

ASCII Code
151

Character
i

153
154

k
l

155

156

157

160

161

152

173
174

175
176
177

SHIFT* | CTRL*

{
:

)

v
v
\/

DEL

{
:

.
|

DELETE

None

]

Action/Description
Print character, move print head

one position to the right.

Print character, move print head

one position to the right.

* A check in this column indicates the key (SHIFT or CTRL) that must be held down while the character key is typed.
If both keys are checked, then both keys must be held down.

3-15

None

OPERATOR CARE, PACKING, AND REPACKING

OPERATOR CARE
1.

not

oil

UNPACKING AND INSPECTION
the

DECwriter.

Moving

parts

are

prelubricated and sealed by DIGITAL.

unpacking and inspecting the DECwriter.

Keep the cover closed whenever power is applied.
Use only a lint-free cloth when cleaning the cover
and the keyboard. Do not use solvents or harsh

cleaning agents to clean

the

cessively

detergent

dirty,

mild

DECwriter.

If ex-

solution

clips,

staples,

etc.

If an

Cut the nylon retaining straps from around the
shipping carton and discard them.

Remove the full telescope cap and then remove
the stitched tube.

Remove all shock-absorbing material and packing

Do not use any DECwriter surface area to hold
paper

desktop cleaner may be used sparingly.

pencils,

The following procedure outlines the steps required for

from around the DECwriter (Figure 50).

object

accidently falls into the machine, turn the POWER
switch to OFF, unplug the power cord from the

Remove the poly bag from the printer.

wall outlet, and carefully remove the object.
Tear paper only along perforations. Support paper
on

the

Remove the foam

key protector pad from the

keyboard.

DECwriter cover when tearing to avoid

distorting the tractor-feed holes in the paper still
in the machine.

Loosen and remove the hex head bolt securing the

If unexpected trouble arises, refer to the Troubleshooting Guide in this section.

wooden leg brace to the skid assembly. Remove

microfoam

DECwriter.

3-16

from

around

each

leg

the

STRAPPING

TELESCOPE
CAP

STITCHED
—_—p
TUBE

POLYBAG

WOOD BRACE

——

N /

" ————

TERMINAL

HEX HEAD

BOLTS
/ MICROFOAM

wOOD SKID

POLYBAG

TEE NUTS

cpP-2187

Figure 50

DECwriter Packaging

3-17

CABLE
TIE
7555-10

Figure 51

Carefully

inspect

the

DECwriter

cabinet,

Cable Tie Location

key-

12.

board, and carriage assembly for possible shipping

damage.

Connect the interface cable to the user’s equip-

ment. (See the DECwriter Interface Information.)

Inspect and check the enclosed packing

list for lost or missing items. Report any damage
or

missing

items

the

local

DIGITAL

NOTE
Site plans are not supplied by Digital Equipment

Field

Service or Sales Office and to the local carrier.

Corporation. Interface logic connections must be
specified and provided by the system supplier, or

Remove the

printer from the wooden shipping

the customer, because each installation may be

skid and place it in the desired location.

different.

Lift the DECwriter top cover assembly; clip and

10.

PACKING PROCEDURE

remove the nylon cable tie securing the print head

If it becomes

assembly (Figure 51). Remove the caution tag.

another location, repack it per the following procedure.

Install

and

adjust

the

leveling

feet

necessary

to ship your

DECwriter to

Remove the ribbon and paper.

the

DECwriter legs.

Using a

nylon

cable tie, secure the print head

assembly to prevent movement while in transit.
11.

If necessary, wipe all outer surfaces with a clean,
soft, lint-free cloth.

Pack the DECwriter as shown in Figure 50.

3-18

TROUBLESHOOTING GUIDE
Symptom

DECwriter does not turn on

when POWER switch is set to
ON.

Possible Cause and Corrective Action

AC power cord is not plugged into wall outlet — plug
itin.

Current is not coming from wall outlet — check
outlet with a known working electrical device (such
as a lamp).

Check AC Line fuse (Figure 52).

If none of the above, contact your local Field Service
Office.

Print head does not print
characters.

Check servo fuse — might be blown (Figure 52).
Print head may be set too far from paper — adjust the

carriage adjustment lever.

Check option interconnect cabling (Figure 8).
Light print

Print head may be set too far from paper — adjust the
carriage adjustment lever per impression adjustment
procedure.

Ribbon ink has run out — replace ribbon.

Reverse ribbon after 8—12 hours of continuous
printing. Ribbon should be reversed only once, then
changed.

Paper does not advance

Improper loading of paper — check tractor covers to
ensure that they are closed.

Holes in paper are torn — turn DECwriter OFF and
reload paper properly.
Paper snagged or caught by box.
Paper tearing on multipart
forms

Print head is exerting pressure on paper so that paper

tears when it advances — check print head position
control. (Adjust Carriage Adjustment lever.)

Tension exerted on the paper by the tractors is
incorrect.

Line bunching

Tension exerted on the paper by the tractors is
excessive.

F2 FUSE RATING
FUSE
24 5B

FUSE RATING

VOLTAGE

FUSE

AC LINE FUSE

FUSE RATING
115V.

3A SB

230V.

15A SB

SERVO FUSE

7622-21

Figure 52

Fuse Locations

3-20

SECTION 4
DECWRITER lli

INSTALLATION, WARRANTY,
AND SERVICE INFORMATION
LA35

DECWRITER li

INSTALLATION

WARRANTY

INSTALLATION/WARRANTY:

If purchased directly from DIGITAL: Reference the sales agreement for installation and warranty terms pur-

chased with this DECWRITER II.

If purchased, leased, or rented from a vendor other than DIGITAL: Contact your vendor for information
regarding installation and warranty terms purchased with this DECWRITER II.
DIGITAL SERVICES:

A wide range of maintenance and customer services are available from DIGITAL for your DECWRITER I,
Through use of these services, you can design a plan which meets your service needs, from complete DIGITAL
maintenance to complete self-maintenance. Vendors supplying DECWRITER IlI's may use these services as
factory back-up support.

On-Site Service: Repairs performed at the equipment site by a DIGITAL engineer.

Service Agreement — A set monthly charge which covers all your maintenance needs. Includes:
priority response; all repairs performed during the contracted hours of coverage available from 8
hours, 5 days per week, to 24 hours, 7 days per week; materials, labor, and travel; and applicable
engineering change orders.

Select-A-Day Service — Provides maintenance service at predetermined days of the month at a
reduced rate. Under this agreement, a DIGITAL Service Engineer will report to your site on the
agreed upon days and perform all necessary maintenance. The number of maintenance days is
determined by the number of DECWRITER IlI's under the agreement and is subject to minimums.

Per Call — Service by a DIGITAL Service Engineer on a time, travel, and materials basis.

Off-Site Service: Designed for customers who can afford the loss of their equipment while it is being repaired
at a DIGITAL Product Repair Center of Servcie Center.

Return to Service Center — Maintenance service on a “walk-in" basis at designated Field Service
offices. This service is available on a contractual or per call basis, turnaround is usually three
working days.

Please register my DECWRITER II so that I may receive possible future technical information regarding this product and
its associated options.

Name
Address

Serial No.
No. of DECWRITER II’s
at this site

Please send more information on services available through
DIGITAL:

O DIGITAL Service
O Educational Services

CO0Customer Spares

Product Repair Centers (PRCs) — You may-send or bring equipment to a PRC
for repair or replace-

ment under one of the following plans:

Major Repair Work — On a time and material basis.

Fixed Quote Repair — Return equipment to PRC. After inspection, we will contact you
with a
fixed price for repair. If you choose not to have it repaired, a handling fee will
be charged.

PRC Contract — Repairs at the PRC on a contractual basis.

Module Repair — Available through the PRCs in Maynard, Canada, Holland,

Japan, and Australia.

Loose Piece Module Repair — Repair of DECWRITER Il modules on a fixed price basis.
Turn-

around is usually 22 working days.
-

Module

Mailer

Program — A subscription approach to module repair.

For a minimum of

$2,000. the customer may return his DECWRITER Il modules and be guaranteed a turn-

around of 7 working days. This program enables you to significantly reduce
your spares
inventory.

Spare Parts:

DIGITAL's Customer Spares group offers support to our customers performing any
level of
DECWRITER Il maintenance. Available through this group is:
°
o

Spare parts, spares kits, tools, and test equipment.
Recommended spares listings developed specifically for your need and
equipment. This service is

at no charge.
o

Maintenance documentation.

Emergency parts service.

Training: Educational Services offers hardware maintenance courses for your
DECWRITER Il. Available
worldwide training centers and at the customer site.

at 14

LOCATIONS OF PRODUCT REPAIR CENTERS:
North America:

Europe:

Chicago

Princeton

Belgium

Maynard

Santa Ana

France

Ottawa

Sweden

Sunnyvale

Holland

Switzerland

Italy

West Germany

General International Area:
Australia

Japan

————————mrnnflnm—m——

_mmm

INSTALLATION
REGISTRATION
CARD

FIRST CLASS
PERMIT NO. 33
MAYNARD, MASS.

Digital Equipment Corporation
146 Main Street

Maynard, Massachusetts 01754
Attn: Customer Services Marketing
DECWRITER II Installation Card

PK3-2

S-24

Reader’'s Comments
LA36/LA35 USER’S GUIDE
EK-LA3635-OP-002

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dlilgliltiall
DIGITAL EQUIPMENT CORPORATION, Corporate Headquarters: Maynard, Massachusetts 01754, Telephone:
(617)
897-5111—-SALES AND SERVICE OFFICES: UNITED STATES —ALABAMA, Huntsville ¢ ARIZONA, Phoenix
and
Tucson « CALIFORNIA, El Segundo, Los Angeles, Oakland, Ridgecrest, San Diego, San Francisco (Mountain View),
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