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Document:	LA36/LA35 DECwriter II User's Manual
Order Number:	EK-LA3635-OP
Revision:	003
Pages:	144
Original Filename:

OCR Text

1st Edition, November 1975
2nd Edition, February 1976

2nd Edition (Rev), November 1977

The material in this manual is for informational

purposes and is subject to change without notice.
Digital Equipment Corporation assumes no responsibility for any errors which may appear in this

manual.
Printed in U.S.A.

For additional copies of this document, specify Order No.:

EK-LA3635-OP-003

The following are trademarks of Digital Equipment
Corporation, Maynard, Massachusetts:

FLIP CHIP

DECtape

UNIBUS

DECsystem-10

PDP

DECmagtape

DECUS

DIGITAL

TABLE OF CONTENTS
Page

SECTION 1

LA36 USER’'S INFORMATION

LA36 GENERAL INFORMATION

. . .

e e i

et e e e e e e e e e e e e e e e e e e e e e e e

Introduction . . ...... [ RTINS
S P05 PP
R

10} 4 Lo o T
LA36 DECwriter Model Variations . . . . . . . @ i i i i i e i
LA36 Jumper Configurations
LASE Specifications

. . . . . . . . .

. i i i i

. . . . & . i i i ittt e e e e e

i i i et e e e e

e e

LA36 OPERATOR'SGUIDE . ... ... .. ... ...... e
LA36 Operator Controls and Indicators
Usingthe

LA36

nen.. e

et e

LA36 INSTALLATION AND CHECKOUTGUIDE . . . .. .. .
Unpacking and Repacking

e e

1-3

e e

1-3

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

1-4

e e e e e

e e e e

. . . . . . . . .

e e

0 i it it it e e

e e

. . . . . . . .

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

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

1-5
B3

e e e e e e e 1-12
e

e e e

e e

e 1-12

e e

e 1-12

e e e 1-12

i ittt e i e e e e e
d e e 1-14
e

i eB L
L ... 114

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

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

. .. .. ... . ... .. ..., A N 1-14

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

SETUP AND OPERATING PROCEDURES FOR LA36OPTIONS
APL Option (LAXX-PK)

e e

e e e 1-11

e e e e e e

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

. . . . . . . v v i v i v i it it et

CONTROLS AND INDICATORS FOR LA36OPTIONS

Acoustical Coupler Option (LAXX-LM)

e e

e e e e

i it i it e e e e e e n

. . . . . . . . . . i i i

Checkout and Acceptance Procedures

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

1-1

. . . . . . . . . . . @ i e i i i i i i et e e T

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

General Installation Information

1-1

S
S P SO

e e e e e e e e e e et e e e

1-1

. . . . . . . i i

ittt et et e e 1-15

. ... ... ... ... ... ...... S S R

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

e e e e e e e e e

Forms Control, Vertical Tabulation, and Horizontal Tabulation Optton (LAXX- KY)
Automatic Line Feed Option (LAXX-LA) .. . .. .. ... .o

Automatic Answerback Option (LAXX-KX)

. . . .. .t

iii

.... e

e e e e B

aie e

e e

L 1-15

1-15

............ 1-17
e e e

e e, 1-18

e 1-19

TABLE OF CONTENTS (Continued)

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

. . . .0
. . . .

INSTALLATION AND CHECKOUT OF LA36 OPTION KITS
INtrodUCtioN

. . . .

e e

e e e e e e

e e e
e

. . . . . o

e e e e

e e e

Expander Option Mounting Kit (LAXX-LB) . . . . . . . . i i i

APL Option Kit (LAXX-PK) . . .

Forms Control Option Kit (LAXX-KV)

. . . .

e e

1-19

e e e e e e e e e s ... 124

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

s, 1-25

e 1-25
i 1-25

e 1-26

e e e

e, 1-32

Forms Control, Vertical Tabulation, and Horizontal Tabulation,

Option Kit (LAXX-KY) . . o

Selective Addressing Option Kit (LAXX-KW)

Automatic Answerback Option Kit

. . . . .

(LAXX-KX)

EIA Interface Option Kit (LAXX-LG)

. . . .

Paper Out Option Kit (LAXX-KZ)

. . .

e 1-34

... 136

e e e

e e 1-37
e e e

e e e e e e e e e

e 1-40

e e e

e e .. 1-42

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

e e e e e e e

e e

e 1-42

1-44

e 1-46
1-49

... ... ...........e 1-49
. ...
.. .. e

. . . . o

Acoustical Coupler Option Kit (LAXX-LM)

. . .

e
. 0 o

e e e e

e e

e e e e e e e e e
e

e e

e e 1-62

e 1-54

e e e e e e e s

e 1-54

LA35 USER’S INFORMATION

LA35 GENERAL INFORMATION
Introduction

(@ 1o 1 o T

e
i

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

SECTION 2

. . . ..

20 mA (DEC 10) Cable Option Kit (LAXX-LK)
DF11 Adaptor Kit (LAXX-KH)

e e e e e e e

i
o

. . . . . .

Compressed Font Option Kit (LAXX-KJ)
20 mA Cable Option Kit (LAXX-LH)

e e e e e e e e

. . . . . .

14-Key Numeric Pad Option Kit (LAXX-KE)

e e e e e e

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

. ... ... . . . . .. T

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

2-1

V-

2-1

LA35 Jumper Configurations

e e e e e e e

. . . . . . . i i i it

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

LA35 OPERATOR'SGUIDE . ... ... .. ..... O e e e e e e e
LA35 Operator Controls and Indicators . . . . . . . . i i i i i i i e e e et e e e
e e e e

2-4
2-4

Using the LASD

. . . . ot

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

e e

2-2
2-2

e e e e

e e e e e

2-3

i i

e ..

. . . . .

e e

LA3D Specifications

. . . . . . .

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

2-1

e e

LA35 DECwriter Model Variations

e e e

2-6

LA35 INSTALLATION AND CHECKOUT GUIDE . . . . . .
it e e e e e e e e e e e e
General Installation Information . . . . . . . L i i it e e e e e e e e e e e e e e e e e
Unpackingand Repacking . . . . . . . . . . . i 0 i i i
e
e
e e
e e e
Checkout and Acceptance Procedures . . . . . o i i i i i v i e e e e e e e e e e e e e e e e e e s
CONTROLS AND INDICATORS FOR LA35 0OPTIONS . . . . o i i
i
e e e e e e e e s e
e e e
Forms Control Option (LAXX-KV) . . o i i i i it
e
e et e e e s e e e s i
e e e s 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

2-7
2-7
2-7
2-7
2-9
2-9
2-9
2-9

Acoustical Coupler Option (LAXX-LM) . . . . . . ..
i it ii e e e
ee e S
S |
SETUP AND OPERATING PROCEDURES FOR LA35OPTIONS . . . .. . ittt
iii o .. .2-10
APL Option (LAXX-PK) . . . o
e e e e e e e
e e e e e e e e e e e e 2-10
Forms Control Option (LAXX-KV) . . L 0 i i it
e e e e e e s e e e e e e e e e e e 2-10
Forms Control, Vertical Tabulation, and Horizontal Tabulation Option (LAXX-KY) .. ... ... .. .. 2-10

TABLE OF CONTENTS (Continued)

Page

e e e e i e e 2-12
(LAXX-LA) . . . . . . o o i i i i
tic
Line Feed Option
Automa
e e 2-13
e e e
e e
Automatic Answerback Option (LAXX-KX) . . . . . o
e e e e 2-13
e
e
e
e
e
e
e
e
..
Selective Addressing Option (LAXX-KW) . .. ... ... .. .
e e 2-17
e
e
e
e
e
e
e
e
e
..
Acoustical Coupler Option (LAXX-LM) . .. ... ... .. ...
INSTALLATION AND CHECKOUT OF LA35 OPTION KITS . . . . i it it e e e e et e e e e e e e 2-18

Introduction . . . ... ... ... ... ..., e e e e e e e e et e 2-18
Expander Option Mounting Kit (LAXX-LB) . . . . . . . o oo i i
e 2-18
e e e e e e e e e e et e e e e 2-21
e e
APL Option Kit (LAXX-PK) . . . . it
Forms Control Option Kit (LAXX-KV) ... ... .....e e e e e e e e e e e e e e e e e e ee e e 2-21
Forms Control, Vertical Tabulation, and Horizontal Tabulation

e e 2-24
e e e e e s e e e
e
Option Kit (LAXX-KY) . . ..
e e e 2-27
e
e
e
e
e
e
i
Automatic Line Feed Option Kit (LAXX-LA) . . . . . o o
2-27
e
i
Selective Addressing Option Kit (LAXX-KW) . . . . . . o i i
2-30
e
e
Automatic Answerback Option Kit (LAXX-KX) . .. ... . . it
EIA Interface Option Kit (LAXX-LG) . . . . . o i i i
e e e e e e e
e e e e e 2-32
Compressed Font Option Kit (LAXX-KJ) . . . . . . 0 i i i i
e e
e e e e e e e 2-32
e e e e s e e e e e 2-36
20 mA Cable Option Kit (LAXX-LH) . . . . . . o
20 mA (DEC 10) Cable Option Kit (LAXX-LK) ...
.. .. .. e
e e e e e e e e
e
2-36
Scale, Pointer, and Window Option Kit (LAXX-LN) . . . . oottt i it e et e et e e e e e e 2-39
e e e 2-41
. . . .
Kit (LAXX-KH)
DF11 Adaptor
e e e e 2-41
e e
e
Acoustical Coupler Option Kit (LAXX-LM) . . . . . o o
SECTION 3

COMMON INFORMATION

LOADING PAPER AND CHANGING THE RIBBON . . . . . . o i ittt i e e e e et e et 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
Loading Paper . . . . . o i i
s
e
e
e
e
e
it
e
et
it
i
e
i
it
it
i
o
.
.
.
.
New FOrms . . .
Loading
Paper Positioning Procedure . . . . . . 0 0 i i i
e
e
e e e e e e
e
Impression AdjUustment . . . . . . o i s e e e e e e e e e e e e e e e e e e e e e e
e
Horizontal Positioning Adjustment . . . . . . . . . i i i
e e
e e e e e
e e

Fine Vertical Positioning . . ... .......... e

34
3-1
3-1
3-1
3-4
3-5

e e 35

241
Reloading Paper. . . . . O
Ribbon Installation. . . . . . . i i v i i s e e e et e e e e e e e e e e e e e
e e e e e 3-7
DECwriter Interface InfOrmation . . . . v v v v v e e e e e e e e
e
e 3-10
Interface DesCription . . & v v i i i i
e e e e e
Interface SPeCifiCations . . & . . . v i i i i i e e i
PROGRAMMER
'S GUIDE

. . . . .

LA36 Programmer’s Information

it i

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 s e e e

. . . . . . . @ . i i i i i i

e
e e e e e
e e e e e

e e e e e e

Packing Procedure . . . . . . . L

. . . .

e e

e e e e e e

e e

e e e e e

e e

e 3-10
e s 310

s e

e e 3-14

e e e e

e e

e e e e

e e

3-14
Transmitting Characters and Commands . . . . . . . . . . ot i i i i i i it et
e e e
e e
e 3-14
Special Command Keys . . . . . . i i i i i
e
e e e e e e e e e e e e e e e e
e e
e e 3-14
Receiving Charactersand Commands . . . . ... ... .. .......... PP 3-14
OPERATOR CARE, PACKING, AND REPACKING . . . . . .
i
e
e
e e e
e e e e e e 3-19
OpPerator Care . . . . it it s 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 3-19
Unpacking and Inspection . . . . . . . . i i i i i i ittt e e e e e e e e e e e
e
e e e e e 3-19
TROUBLESHOOTING GUIDE

e e

e e e e

e e

e e 3-21

e e e

e e e 3-22

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:
L

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-DJ

LA36-CE

LA35-CE

LA36-CF

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

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

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

SECTION 1

Preprinted forms can be positioned for the best print-to-

INTRODUCTION

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

lmwpcmtmnmg incidence through the use of the manual

termmal

The keyboard is a standard ASCll-coded keyboard,
consisting of alphanumeric characters and nonprinting
system control codes. The ASCIl code set consists of
upper and lower case characters and prints at a horizontal spacing of 10 characters per inch and a vertical

vemmr pamr advance adjustment.

as an input/output device that can be used as a system
command console or as a remote communications

The LA36 incorporates a low-speed impact printer for
hard copy output and a standard ASCIl keyboard for
transmitting data to the host system or to another data
communication terminal(s).

spacing of 6 lines per inch. The CAPS LOCK switch on

thekeybomd allows sewlactmn a'f a reduced number of

The printer is capable of handlmg multipart and multiform line printer paper from 3 to 14-7/8 in. (7. 62 to

ASCI| ahamcters

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 describedin the following table.
LA36 Options

.
Options

LAXX-LB

. L
Description

Control
Switch/Indicator

‘
Name

Expander Option

‘None

The Expander Option Mounting Kit includes

the logic, cables, and mounting hardware re-

quired to expand the LA36 to include options

LAXX-LA, LAXX-KV, LAXX-KW, LAXX-KX,
LAXX-KY, and LAXX-PK.

LAXX-PK

APL/ASCII Dual
Character Set
|

ALT CHAR SET,
CHAR SET LOCK,
and STD/ALT

This option provides an APL alternate character
set for use with the standard character set in
the LA36.

CHARACTER SET
Indicators

LAXX-LA
|

Auto LF After CR

AUTO LF

When the AUTO LF switch is activated, the

printer will automatically insert a line feed after

each carriage return code typed during trans-

mission. The LAXX-LA option can also be
configured to execute a line feed after each
received carriage return code. Any combination
of these options can be used.

LA36 Options (Cont)
Control

Options

Name

LAXX-KV

Switch/Indicator

Description

Top of Forms

FORMS LENGTH

Control

Switch and SET TOP

Controls mounted under the top cover provide

OF FORM Push-

button

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 the paper

length defined by the operator.

LAXX-KW

Selective

DEVICE SELECT

Addressing

and SELECT AVAIL
Lamps

LAXX-KX

Auto Answerback
and Auto LF

HERE IS, AUTO LF
'

The Selective

Addressing Option allows the
LA36 to communicate with other terminals on

a single data communications channel.

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

of the

Auto

option

(LAXX-LA).
LAXX-KY

Forms Control and

Keyboard Keys

The

Forms and Tabbing Option enables the

Vertical and Hori-

terminal

zontal Tabs

positions either locally or via the system soft-

to set horizontal

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

Interface

The LAXX-LG interface provides the user with
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

Kit

The DF11 Mounting Kit enables the user to
mount

one

the

DIGITAL

series

DF11

communication options in the LA36.

LAXX-KJ

Compressed Font

None

Option

The Compressed Font Option is a mechanical

option that provides the LA36 with the ability
to

print 132 columns on a form 8-1/2 in.

(21.59-cm) wide.

LAXX-KE

14-Key Numeric
Keypad

Keyboard Keys

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

matical number sequences.

LA36 Options (Cont)

LAXX-KZ

Paper Out

’PAP‘ER ouT

dition. Prevents keyboard and received data

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

- inferface'thm meets the requirements of CCITT
(v28) with BPO-required modem protection
|

circuitry.

Current Loop

None

Current Loop

None

- Cable

LAXX-LK

Provides a visual indication for a paper-out con-

from printing.

and Modem Protector

LAXX-LH

Lamp

None

TTL to CCITT
(V28) Converter

LAXX-LC

Description

~ Switch/Indicator

Name

Options

20 mA current loop with Mate-N-Lok.

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

Cable

LAXX-KG

LAXX-LN

EIA Interface

Scale, Pointer,
and Window
Kit

None
|

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

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

Operator convenience items that assist in positioning the print head on preprinted forms and

Column scale,
Line Indicator, and

in locating horizontal tabs.

Column Pointer

LA36 DECwriter MODEL VARIATIONS

The LA36 variations and associated model numbers are listed below.

LA36-CE
LA36-CF

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-CH
LA36-CJ

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

LA36-DE

LA36

60 Hz, 90-132 V

LA36-DJ

LA36

50 Hz, 180-264 V

LA36-DF
LA36-DH

LA36
LA36

LA36 JUMPER CONFIGURATIONS

LA36 Optional Current Loop Configuration

The LA36 is normally cnnfigumd for furll-duplex passive

operation. To modify this configuration for full-duplex

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

active, half-duplex active, or half-duplex passive, jumpers
on the logic board must be changed. For a detailed

description of these jumper modifications and the

associated cabling required, refer to the LA35 DECwriter 11 Maintenance Manual.

LA36 Parity

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

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

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 logic board must be changed. For a detailed
description of these jumper modifications, refer to the

acceptable (if line is on one margin only). Do not
line glue both margins as air will not be able to

LA36 DECwriter || Maintenance Manual.

escape and poor impressions will result.

LA% Speakm (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 Il Mainte-

Standard ANSI keyboard layout

nance Manual.

Multikey roll-over
Interface

LA36 SPECIFICATIONS

Integrated 20 mA current loop, wath standard or DEC10

cable or EIA/CCITT interface.

Printing

Switch

selectable:

10,

15,

characters/second

throughput

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

Spool

Line Length

assembly:

0.5

in.

(1.27

(36.58 m) Iong

132 characters maximum

Power

Spacing

cm)

wide X 40 yd

90—132 Vac or 180—264 Vac

10 characters/in. (horizontal)

50 or 60 Hz + 1 Hz

6 lines/in. (vertical)

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

Characters

96 upper/lower case ASCII
7 X 7 dot matrix (0.07 X 0.10in.) (1.77 X 2.54 mm)

Temperature

Operatnng

10° to 40° C (50° 1:0104 F), nnnmndemmg

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

Single-Part:
Card

stock

thlckness

Nonoperating

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

15 Ib paper minimum

of 0.010 in.

(0.25 mm)

maximum

Relative Humidity

Operating
10 to 90% with a maximum wet bulb temperature

Multipart:

2- to 6-part (see Notes)
Thickness of 0.020 in. (0.50 mm) maximum
Tractor-drive, pin-feed

Nonoperating

5 to 95%
NOTES

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

Dimensions

Muiltipart 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

NCR or 3mpaper, up to 6-part, must use ribbon

on mp copy. First surfam impact paper is not
recommended.

24.0 in. (60.69 cm) deep

Weight

;
102 Ib (46.36 kg)

LA36 OPERATOR'S GUIDE

7622-28

FDX/HDX Switch

NOTE

Dot

switch

indicates

The FDX/HDX switch controls the printing of trans-

function of switch when

mitted keyboard characters. When in the FDX position,

depressed.

characters typed on the keyboard are transmitted; only

received

characters

are

printed.

When

the

HDX

position, keyboard characters are both transmitted and

POWER ON/OFF Switch

printed; received characters are also printed. The opera-

The POWER ON/OFF switch connects and disconnects

tor should not attempt to transmit data when receiving

the line voltage to the LA36 DECwriter 1l. The POWER
switch should be in the ON position for normal unit

data in the HDX mode.

operation. When changing paper, ribbon, or adjusting the

BAUD RATE Switches

print head, the switch should be turned OFF.

The

BAUD

RATE switches select the rate at which

characters are transmitted and received over the communication line.

LINE/LOC Switch

Switch

The LINE/LOC switch is a 2-position operator control

Character Rate

switch. When in the LINE position, the LA36 is enabled

110

10 {(characters/second)

to transmit and receive data. When in the LOC position,

300

30 (characters/second)

the LA36 receive/transmit lines are disabled and only

110 and

15 {characters/second)

local operation can be performed.

1-5

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 code will be transmitted each time a carriage

CHAR SET switch allows the operator to select either

return code is transmitted.

the standard

ASCIl

character set (switch up)

or the

alternate character set {(switch down).

HERE IS Switch

The HERE IS switch is an optional operator control that
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 device can

change

issuing the character

codes

the automatic mode, the
the character

Switch

set

switch

will

cause

20-character

prepro-

{control-O) or

PAPER OUT Indicator

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

When illuminated, the PAPER

standard

visual indication that the LA36 is out of paper. Printing

ASCII

character set.

The Switch

Out code

selects the alternate character set. In the manual mode,

OUT indicator gives a

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

CHARACTER SET indicators give a
of the selected character set.

character

set

option

installed,

a visual indication that the LA36 has been selected as a
slave terminal and can transmit data back to the trans-

If no

mitting

STD

Selective Addressing option LAXX-KW is installed in the

the

indicator will always be illuminated when power is on.

unit.

This

indicator

is 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

unless

option

LAXX-LA

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

that the LA36 has the ability to initiate data transmission.

This

indicator is only operative when Selective

Addressing option LAXX-KW is installed in the LA36.

7622-28

CTRL Key

SHIFT Key

The CTRL key provides the LA36 operator with a
codes
control
ASCIl
transmitting
of
method
(0005 —0375). Holding the CTRL key down and pressing
any alphanumeric key or control key changes the
standard alphanumeric ASCIlI code for that key to a

This is a momentary switch which, when depressed,

control code (000g —0373).

option LAXX-KY is installed.

CAPS LOCK Key

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

allows selection of uppercase for all printable characters.
TAB Key

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

ESC (SEL) Key

The ESC (SEL) key generates code 033g. This provides
the LA36 operator with a convenient method of

generating an escape command code sequence. The
printer does not respond to the escape code unless
option LAXX-KY is installed.

D
E
F
E
N
I
L
e
h
t
g
n
i
aeLOCALmode ndpres
7622-28

REPEAT Key
The

REPEAT key does not generate an ASCIl code.
However, when the REPEAT key is held down and any

key

is depressed,

it causes

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

key is released).

AL 36inth

ed by
Rapid paper advance can be obtain

placing the

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

RETURN

The

Key

RETURN

to the left each time a BACKSPACE code is received,
key generates code 0155. The printer

until1 the print head reaches the left-hand margin.

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

operation is executed simultaneously with the carriage

not respond to the delete code.

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

the capability of adding a line feed command after the

The BREAK key is provided for users that utilize the

carriage return is included.

INE FEED Key

The

received.

mode

allows the

LA36 operator to interrupt incoming data

transmission.

The

BREAK

key

flow by forcing the communication line from a mark
mode into the space mode (until

LINE FEED key generates code 0125. The

| advance the paper one line each time the LF code

half-duplex

the BREAK key is

released). If the LAXX-LG EIA interface is installed, a
short space (230 ms) will be generated.

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

---~

PUSH IN HERE
AND TURN TO
s

ADJUST PAPER
VERTICALLY

PAPER

4 @%{fié%'fi“

2";4:.

ADVANCE

KNOB

one line.

’gfis |
.

L
i
e

simply turning the knob. Each detent turned represents

Tractor Adjust Knob

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

ADJUST
KNOB

7595-7

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

Each

keypad

ASCI|

generates

the

same

key in the numeric

character

the

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

key.

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.

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

Select AU U LF, if apphwm

Seim:‘t dammd bmd rate WAUD RATE amwtn%}.

Sm t;hae LIN&/LOC awitch to LINE

Load paper (d%mbmin Swtmn 3).
Set UNE/ LQC fiwmh msL IC.
Set POWER ONIOFF swmh to ON.

Select full-duplex
switch).

or half~dua§ex

(FDX/HDX
f

The LA36 is now on-line and ready to receive and
transmit data.

LA36 INSTALLATION AND CHECKOUT GUIDE
GENERAL INSTALLATION INFORMATION

CAUTION

This section contains the step-by-step procedures for
unpacking and unit checkout to ensure that the unit

Before connecting the LA36 to a power source,
ensure that the line voltage and frequency are

compatible with the power requirements of the

was not damaged during shipment and that the unit is

operating properly prior to connection to the com-

machine. Ensure that the POWER switch on the
T b
Ly

munication system.

console is OFF.

The LA36 DECwriter 1l should be installed in an area

Connect the LA36 line cord to the correct wall

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. A minimum 4-in.
clearance between units must be maintained at all times.

Set the baud rate to 300 and the LINE/LOC

Adequate service clearance must also be provided for

switch to 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

tone will sound. Type a line of characters. When

UNPACKING AND REPACKING

the print head passes the 64th character position,

Unpack the LA36 as described in Section 3. If it be-

the bell tone will sound.

comes necessary to ship the LA36 to another site, refer

to the repacking procedure described in Section 3.

Press the BACKSPACE key. The print head will

move one character position to the left.
CHECKOUT AND ACCEPTANCE PROCEDURES

After

132 characters have printed, press the
RETURN key and observe the return of the print

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

head to the ““home” position.

Section 3.
Set the
1.

Install

ribbon per ribbon installation procedure

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

3).

switches must

be depressed to obtain a baud rate of 150.

1-12

27.5"

(696 mm)

24"

21.

25.0"

“

| ( 551 mm)

(635mm)

ome wt

SERVICE

|omensions

| a{Blc|o|E|F

INCHES

335 275| 14

MILLIMETERS

|852 696|356|610|

|24 | *|o6

* [2440|

* CURRENT LOOP CABLE (BCOS5F) LENGTH
IS 15 FT ; EIA CABLE LENGTH IS 9 FT
(2744mm)

i
SERVICE
AREA

|
!

cp-2023

LA36 Site Considerations

The following options include additional controls not

before the Last Character Visibility shift, the red

present on basic LA36 DECwriters.

line after the shift.

This option requires the addition of a top-of-form control assembly, which is installed beneath the top cover
on the print head chassis. There are two controls on this

assembly: SET TOP OF FORM and FORM LENGTH

(Figure 1).
®

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.

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.

This option also utilizes the top-of-form control assem-

bly (Figure 1).

This

option

contains three indicators:

Column Scale,

Line Indicator, and Column Point er as shown in Figure 2.

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

siblecolumn locations. The column scale adheres

Figure 1

Forms Control Assembly

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

used

establish

two

printing

locations. The

GREEN

longer top surface indicates the baseline of the

POSITION OF

characters in a particular line. When setting up a

form or rolling back to a previously printed line,
this top surface is used to exactly align where the
next character will print. The smaller surface on

NEXT CHARACTER

TO BE PRINTED
CHARACTER
BASEL INE

WM/

COLUMN
POINTER

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

TM spaceR

indicator is also included in the APL/ASCII Dual

Character Set Option

(IF NEEDED)

(LAXX-PK).

yed

The column indicator is used in conjunction with

LINE INDICATOR

CP- 2099

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

Figure 2

Lin e Indicato r and Column Pointer

SETUP AND OPERATING PROCEDURES FOR LA36 OPTIONS
character set using the ALT CHAR SET switch. In the

LA36 options requiring setup or operating instructions
in addition to those instructions given for the basic
LA36 are presented in the following paragraphs.

up position, the ALT CHAR SET switch selects the
ASCII character set; in the down position, the alternate

NOTE
Throughout the operating and ahwkaut procedures, the

LA36 will prmt The STD lamp illuminates for the

Control Key (CTRL)and E.wam Key (ESC) are usedin

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 mthev the
alpha or numeric key.

APL character set is selected. |llumination of the CHARACTER SETlamps indicates which character set the

ASCII set and the ALT lamp for the APL character set.

Kavbeard 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 shawa tm tm: %mgnmams for both character

APL OPTION (LAXX-PK)

sets.

An LA36 DECwriter containing this option can print
either the standard ASCIl characters or the alternate

APL characters. The position of the front panel CHAR ”

'FORMS CONTROL OPTION (LAXX-KV)

Sm’up — (The DECwriter is assumed to be deenergized.)

SET LOCK switch establishes whether control over

Measure the form to determine its length in inches. Then

character

operator-determined

remove the top cover from the LA36 as in paper loading

(manually) or computer-determined (by programming).

procedures. On the Forms Control panel, set the FORM

In the up position, the CHAR SET LOCK switch permits

in inches, to the length of the form (Table 1). Proceed

set

switching

LENGTH rotary switch to the number that corresponds,
the transmitting device to change character sets by

with the normal loading of the forms. When completed,

sending either a CTRL O (Switch In) or CTRL N
(Switch Out) command. CTRL O (code 01 68) selects

use the Paper Advance knob to align the top line of the
form With the print head (Nmmalw the top lineis 2 or

the standard ASCII character set; CTRL N (code 0178)

3 lzms belmw the perfmmmn but it can be established at

selects the alternate APL set

any line on the form.) Close the top cover and energize

When the CHAR SET LOCK switchisin the down posi-

~ tion, the operator can manuafly select either available

- the DECwriter. The form length indicated by the FORM
LENGTH switch is automatically entered during the
power-up sequence.

with>

' \/ \/ \/ \/ \/ \/ \/ \
CACC \/ N \/ \/g \/ \/ \/ \

(N \/ ' \f—\/ VAL }{\

(V) A
Figure 3 Key Caps Locating APL Characters

CP-2100

Noo]nlv+]i<]vIHiR]Ff]]Bl~lms l hoA an |wA|laa|lz|la|-|ol>]3|x]|>|N|u|o7

:|-no||w=]a|e]ax]|]mo]|eln]TM|zo= 1‘0A81fnlelenlnsl,g,SOil~ti|MaecIn:oWas]L-go|

-lneQool]lwr~DN~lni|=wWlMowv]no<lilwlW]v=.=n=ilo]E]no=llWE]B~=lolN<]ollAW=~lolEoZllCBI~0loEIHollWL=~IloEVOo:< llF=loGCollRM=~USm%SLfrw. =) n|ff]%%|l2~&w&i|iS2l0lw|—NvG2~l1jf]n%1ozl2j‘R(M—fI35jS1lo1-E4l:5f~8eE56i|1l,346WEo2llf|0—71—Abl~2~'j8|1fAmn1l8ll9oLo<~e]fn0l|91ll~w=2eil3,t|sowi281|l&d—|li13w~RzliIi4om‘n8]0i3~|imzo~&i|1mlw.ZWlllvw-—)o o== o/=o"
,TLxIM]llelewa]lHnllewlulXl e]l|s2l3rCl]E.l~ae1lrle|sv=. -eQ=a|YlllouzaRl]llooealloe|ae]li]sas2||mn3M4;lW;~|lLxloln|alXaulsll~yM]ulE.8-8||lj~celluo]l||@|o%=&|8g]zllBy|le¢3 o<es -01v&t
-t
o&,/ &.
-

&s/s

-4

Figure 4

b=oeOl~

a. Standard (ASCII) Character Set

S||o%

b. Alternate (APL) Character Set

Bit Assignments for ASCIl and APL
Character Sets

1-16
p

—

The procedure for wmng up the Forms Control Option

when the DECwriter is anergsmdis the same except that
the SET TOP OF FORM pushbu‘twn has to be pressed
after the form

Iength is salected

and '0638' remotely. Advance the form to the next

vertical tab and store this location in the same manner.

by the
The number of tabs that can be set is limited
number of printable lines on the form used. For

example, an 11-in. deep form could have up to 66

Operation — The operator can generate a Form Feed

vertical tabs.

command by typing CTRL L. The program-generated
Form Feed (FF) command is 014g. Upon receipt of a

- Table 1

FORM LENGTH Switch Positioning

Form Feed command, the paper will advance to the next

top-of-form line.

Form Length

FORM CONTROL PROGRAMMING

(inches)

FORM

LENGTH

Printable Lines

Switch Setting | Per Form (Maximum)

NOTES

To avoid losing incoming characters during a form

control operation, fill characters must be added.
‘These nonprinting fill characters (such as NULL or

DELETE) effectively slow up the data mput rate

while the mmtm machamam 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

3.5

4
5.5

(round off to 'tha‘namhighm number).

Once a form feed has begun, it cannot be aborted.
If a second me Fead command is issued within
16 lines fmm the next tc»p of form, the paper will
not stop at that next top of form, but will execute
the second Form Feed command and skip one full
form length. If the second Form Feed command is

7
8

42
48

12
14

72
84

character buffer is empty before a carriage return,

15 fill characters can be subtracted from the above
number. All fill mmuia‘tmns are made at 300 baud.
For 150 baud, halve the values (round off to the
next higher number); for 110 baud, use one third

24
33

To clear allwrticaimm,wpe ESC 4 or issue codes 033g

then 064g remotely. All tabs are cancelled (cleared)
~during
a power-up sequence.
SRERY
VERT!CAL TA *%ij,;MTlON PROGRAMM!NG
NOTES

Ssmwar ‘to the form feedingsequence, the vertical

tabulation actionmqmms fill ahamctms to slow up
the input data while the mechanism is advancing
the form. Usethe same rule as before to determine

issued with 17 or more lines remaining to the

bottom of the present form, it will be ignored.

| | fflm number offill mharacmm

Likewise, more than two Form Feed memds

wn:hm one fmm mmwa!wm not be mwgmmd

FORMS C Méz "ROL, VERT!QAL TABULATION, AND

mand ismimd and there are
Ha Vertical Tab
~ no tab locations mt typing CTRL K will initiate a

HORIZONTAL TABULATI:“ OPTION (LAXX-KY)

form feed (FF) and advancethepaper to the next

Setup
— This option requires three setup procedures.

top-of-form location.

r 538

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

Once a vertical tab has begun, it cannot be
aborted. If a second Vamml 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

Vertical Tabulation Setup — First perform the Forms
Control setup and, after establishing the top-of-form

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 033g

1-17

ignored. Likewise,

more than two Vertical Tab

‘horizontal tab location. If a second Horizontal Tab

commands within one tab mtmvai will not be

cnmmand

wsuad

rmomnmd

remaining

the present adwmm it

with

spaces
will be

ignored. Likewise, more than two Hmtmntal Tab

Honzonta! Tabulatmn Setup Before setting horizontal

commands within one tab interval will not be

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

recognized.

remotely by code 015 ).w This ensures that the print

head starts at the left mar-im.f Issue space characters (by

AUTOMATIC LINE FEED OPTION (LAXX-LA)

keyboard space bar or by code f()403).umi! 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.
Table 2 shows the various conditions that produce the
specified number of line feeds when in line mode of
operation.

N@TE
Typmg ESC 1 moves the print head one character position.

“

Tabwz

Auto Line Feed Setup

Then space the print head to the next desired tab

Position of

location and store this locationin the same manner. The

AUTOLF

number m‘f horizontal tabs that can be set is limited by

Switch

the available number of print columns on the form. For

Inor Out:%

Striking the TAB key will initiate a horizontal tab move.

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

N/A

then 062g remotely. All horizontal tabs are

Down

HORIZONTAL TABULATION PROGRAMMING

1. To ensure against loss of data while the printer

required

is determined

- In

with LF

'ReceiveCR |
|

multiplying the number of spaces between tabs by
0.55 (round off to the next higher number) or by
~ 'using 12, whichever is greater. The 12 fill characters are needed to compensate for the maximum

N/A

Out.

w;thmut LF

Receme CR |
G

Receive CR

- carriage return time. In instances where the tab

the number of spaces are needed for fills. All fill

-0

;R@cawe CR |

- does not follow a carriage return, only 0.55 times

or Received

|Type |
'RETURN

acters are used to effectively slow up incoming

number

_Ac‘tmn |

Ramm Mode

N/A

mechanism
is executing horizontal tabs, fill charThe

Transmitted

RETURN |

NAA

NOTES

data.

Type

cancelled (cleared) during a power-up sequence.

Imua:tmg

TransmifMod“
de

example, a 17-in. wide form can have up to 132 tabs.

033g

tlumger 3f

Jummr‘w‘j

without LF

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

calculations are made at 300 baud. For 150 baud,

the DECwriter will automatically insert a Line Feed

number); for 110 baud,use onethird (round off

This is a convenience for existing programs that do not

~halve the value (round off to the next higher
to the next higher numbm}

if a Honmmal Tab mmmandis mmmmd and thma

command after each Carriage Return command received.
normally have a Line Feed after a Carriage Return
command. To disable this automatic insertion of the

Line

Feed command, cut jumper W1

lcmated on the

Automatic Line Feed Optmncircuit ‘m

AUTOMATIC MNE FEED PROGRAMMWNG
¥

horizontal

hmbwun it mmot be

e ahmtm M a sec rm Hmmmm%Tab command is
-

issued within 16 spaces from the next horizontal

tab stopping pmmmw t;ha head will not stop at
~that next position,
but will advance to the second

NOTES

;

lfjumper W1 is not cut and the received program

already transmits a line feed after each carriage
return, a second line fwd action mllbe performe

by the printer.

ity s,

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 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 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.

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.

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 ASCII

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.

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:
®

Master — Any terminal in the network can be the
master, but only one terminal is master at any one

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
are
characters
remaining
AIll
(0000000).
disregarded. A full 20-character message does not

in the network.

mitted by the master.

require a NUL at the end.

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

— A condition that allows all
Broadcast Slave
terminals in the network to receive data trans-

Group Select Slave — When addressed

by the

can be cut out to eliminate certain operations of the
auto line feed function. The possible jumper

master using the group address entered into the
Group Select switch on the option board, a
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

configurations are:

network.

contains two factory-installed jumpers (Figure 16) that

Action

Jumpers

Add LF to

Insert LF After

CR
|Received CR | Keyboard Typed

Yes

In
Out

Out
In

Out

Yes
No
No

Yes
No
Yes

Unigue 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.

a.=11 00001

CHARACTER
#

CP-2101

Figure 5

Location of 20 Answerback Message Characters

1-20

EXAMPLE

5=0110101

GROUP

ADDRESS SWITCH

UNIQUE
ADDRESS SWITCH
CP-2189

Figure6

Location of Address Setting Switches

1-21

MASTER

TERMINAL

BROADCAST
GROUP SLAVES

SLAVES

(ALL 6)

(1,2,863)
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 command has its keyboard

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

addressed

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 has an Auto Answerback

character combinations that make up their broadcast,

Option (LAXX-KX) installed and receives a CTRL

group

selected

slaves).

When

uniquely

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

E, the stored answerback message is sent back to

not

the master terminal. This allows verification that

acknowledge

address

is present

their
on

addresses,

even

though

the communications

the
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

CTRL

control the operation of the communi-

cations network.

slave.
1.

can

transmitting

also

capability

used
of

disable

uniquely

the

selected

Normally a uniquely selected slave

can

transmit back to the master but it can be disabled

CTRL SPACE (NUL) — Used after a terminal has
become master to reset all slave terminals to their

address

uniqgue address, CTRL E, then any character or

mode.

This

action

occurs

before

the

following commands from the

command except CTRL B.

master sends addresses down the line.

1-22

master:

NOTE

Group

Type group address.
Type CTRL B.
Send message — All terminals in group receive but

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

cannot transmit.

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

Type CTRL D at the end of a message.
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
devices without having to surrender the lines or
having to readdress previously selected stations. To
continue addressing additional terminals, the
normal selection rules apply, with the sequence
terminating with CTRL B to lock all devices into
either the selected or unselected modes.
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

message — Both

Send

master

and

slave

can

transmit and receive.

Type CTRL D at the end of a message.
Unique Select (1-way)
Type unique address.
Type CTRL E.

Type any character other than a valid address.
Type CTRL B.

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.

also used to select a terminal as the master
anytime the SELECT AVAIL light is illuminated.

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.
Type CTRL D.

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

After becoming master, this terminal can establish the

type of slaves in the network as follows:

Broadcast

Type CTRL G.

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.

Ensure that a CTRL D command follows the end
of

all

transmitted

messages.

This relinquishes

control of the network by the master and allows

other terminals to become master.

Type CTRL B.

Send message — All terminals receive but cannot
transmit.

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

through the brackets.

Figure 8 contains three basic cabling diagrams for the

LA36. These diagrams depict the cabling configurations

between

the M7728

Carefuny' replace the logic board on top of the

logic board and the Expander

grommets

Mounting Option (LAXX-LB) for the various option Kits
available.

Before

installing

any

and secure with the six screws and

associated washers previously removed.

option, it is recom-

mended that these diagrams be consulted to ensure

On the option distribution board assembly (Figure

proper cabling.

10), remove screw (4) and loosen screw (5) on
each hinge bracket.

EXPANDER OPTION MOUNTING KIT (LAXX-LB)
Squeeze each hinge bracket toward the middle
The

Expander

Option

Mounting

Kit

contains

until the hinge tabs (2) of the side brackets can be

the

inserted into the pivot holes as shown.

Quantity
1

ltem

“Insert the two screws (4) and tighten these screws

Part Number

and screws (5).

Option Distribution

10.

Board Assembly
1

Right-Hand Side Rail

See

Assembly

D-UA-LAXX-LB-0

Lock both % turn fasteners (6) to secure the

option distribution board assembly to the side

rails.
11.

Left-Hand Side Rail

Connect the int&rfam cables as shown in Figure 8,
depending upon the options being installed.

Assembly

Grommets

Interconnecting Cables | C-IA-BC08S-1B

9007017-00

Keyboard Cable

C-1A-700861 2-4A

+5 Volt Power Cable

C-1A-7010001-8

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
cover, and plastic housing from the unit.

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

Unhook all cables from the logic board.

similar cable (supplied with this option) to the +5

Remove the six screws and washers that secure the

other cable end to the Faston terminals (7 in

and GND terminals of the power board and the
Figure

logic board to the cabinet door and then remove

13.

Place the right and left side brackets (1 in Figure

the

option

distribution

board

To connect the front panel control cable, the bezel
must be removed.

10) over the screw studs as shown. The hinge tabs
of the side brackets (2) should be pointed inward

the power board.

also be removed from below the logic board.
4.

10)

assembly. Route the cable with existing cables to

. the logic board. The keyboard cable clamp should

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.

1-26

TO U1

" POWER BOARD

20mA SERIAL

INPUT (IF USED)

T0. J2

c1a

(NOT
USED)

KEYBOARD

INPUT
(IF USED)

luyal lu l las]( laa”ml

M7728 LOGIC

BOARD

" A. NO OPTIONS INSTALLED

TO J1
POWER BOARD

EIA

20mA SERIAL

INPUT (IF USED)

INPUT

(IF USED)

“']

”|J3|

lJt’

ldsl

TO J2

|J4|

KEYBOARD

MT7728

(NOT

]

USED)

ld5l |d3l

J2 FRONT

PANEL CONTROL

BOARD

!JZ' I\HI lJ4l

LOGIC BOARD

EXPANDER MOUNTING
OPTION

(LAXX-LB)

B. ANY OPTION
AND AUTO LINE FEED OR AUTO ANSWER BACK OP‘NONS

NOT

INSTALLED

TO J1

POWERIBOARD

20mA SERIAL
INPUT (IF USED)

EIA INPUT

(IF USED)

]
=
J

J2 FRONT
PANEL CONTROL
BOARD

TO J2

KEYBOARD 5]

mM7728
LOGIC BOARD
G

EXPANDER MOUNTING

OPTION

(LAXX-LB)

C. ANY OPTION AND
AUTO LINE FEED OR AUTO ANSWERBACK

Figure 8

OPT’!ONS

INSTALLED

Cabling Configurations for Various LA36
Options

1-26

ED STRIPE
4

, msvm‘rmé
WASHER

INSULATOR

é./ WASHER

{

)

cP-2403

Figure 9 Keyboard and Bezel Assembly — Cabling
and Hardware

1-27

TO FRONT

- PANEL CONTROL

~~DOOR (DECWRITER II)

REF

LOGIC

BOARD (MPC)
CONN J5

CP-2104

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

1-28

15.

Turn the bezel upside down on a piece of foam or

Test After Installation
— Load paper and energize the

bubble plastic and remove the four Kep nuts (9

DECwriter. In local mode, typing will produce printed

Figure

characters.

assembly

that
to

secure the front panel

the

bezel.

Leave

the

control

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

APL/ASCII Dual Char-

Connect one end of the front panel control cable
to J2 as shown in 10, Figure 9. Ensure that the red

Feed

the cable

across

the

cabinet

and

| D-CS-M7732-0-1

acter Set Board

stripe on the ribbon cable is as indicated.
17.

Part Number

down

through the access hole and to J4 (8), Figure 9 on
the option distribution board assembly. Ensure

Edge Connector

B-UA-H851-0-0

APL ROM

23086A6

APL ROM

23087A6

Phillips Pan Head

9006011-1

Screws (#34-40

that the red stripe on the cable is positioned as

X 0.38 in.)

shown in Figure 10.

NOTE

If either the APL Option (LAXX-PK), Paper Out
Option (LAXX-KZ), or the 14-Key Numeric Key-

Flat Washers (#4)

9006655

Lock Washers (#4)

9006688

Line Indicator

C-MD-7414953-0-0

APL Keyboard

D-AD-7011055-0-0

pad Option (LAXX-KE) is also being installed, the

18.

applicable installation procedure should be con-

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

sulted 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.

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

required

install washers at required points may cause circuit

19.

already

installed,

install

the

Expander

Refer to Figure 8 for the correct interface cabling

circuit boards as shown in Figure 9. Failure
to

damage.

not

Option Mounting Kit (LAXX-LB).

integrate the APL Option into the

existing options.

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 APL

washers, and spacers.

board

in location F on the expander

board (Figure 11).

CAUTION
The keyboard bezel should be positioned as far

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

forward

nector and board are keyed for proper fit.)

between

the

possible

keyboard

eliminate

interference

cable

and

assembly.

head
|

Ensure that the spacers are placed under the
keyboard bezel. Failure to do so may result in

Insert the two APL ROMs: No. 23087A6 in socket
(3) and No. 23086A6 in (4). Refer to Figure 11

damage to the print head because of interference

for Pin No. 1 locations.

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

20.

Replace the plastic housing and cover.

the DECwriter.

1-29

APL/ASCII
BOARD

Figure 11

Installation of the APL/ASCII Dual Character

Set Board

1-30

CAUTION

Remove the two front screws (b) 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
possible interference between the cable and print

removed hardware,

head assembly.

NOTE

Unless otherwise specified, all following references

NOTE

are made to Figure 9.

In some instances, it may be necessary to remove

Remove the four screws, lock washers, flat washers

the control panel board before the keyboard can

(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.
Leave the four hex standoffs (4) in place.
10.

11.

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).

Place the new keyboard on the weld studs and
secure it with the four Kep nuts. Provide adequate
cable clearances around standoffs.
CAUTION

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
insert washers at the required points may cause
circuit damage.
16.

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

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

CAUTION

the four hex standoffs in place.
12.

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.

13.

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
board. Failure to install washers at required points
may cause circuit damage.
14.

17.

Replace and secure the plastic housing and replace
the cover.

and J3. Ensure that the red stripe on each cable is

Test After Installation — Install paper and apply power.
In the local mode with both ALT CHAR SET and
CHAR SET LOCK switches down, the DECwriter will

positioned as shown in Figure 9.

print APL characters as typed.

Reconnect the Berg connector to J2 on the new
keyboard. If required, reconnect the cables at J1

FORMS CONTROL OPTION KIT (LAXX-KV)

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

end to the top-of-form control

The Forms Control Option Kit contains the following:

module

board.

Connect the two push-on leads to the terminals on

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

Quantity
1

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

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

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

washers as shown

Board
1

Top-of-Form Cable

D-1A-7011516-0-0

Phillips Pan Head

9006011-1

in (2). Then secure the two

#6-32 X 3/8-in. screws and #6 washers as shown in
(5). Screw in from the outside of the bracket.

Screws (#4-40

Feed the cable under the printer mechanism then

X 3/8in.)
4

Phillips Pan Head

down

9006022-1

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

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

shown.

required 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.

not

already

installed,

install

the

Test

Expander

After

Option Mounting Kit (LAXX-LB).

procedure:

Refer to Figure 8 for the correct interface cabling

Installation
— Perform

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

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

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

distance that is equal

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

setting.

CTRL L. The paper should feed and stop at a
Repeat

this

inches to the switch

procedure

for

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

pushbutton after changing the setting.

setting.

Press

the

SET

TOP

FORM

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

top-of-form

cable

has

two

distinct

Set the FORM LENGTH switch to 3 and press the

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

of push-on connectors. The cable end with the

should increment only one line.

1-32

OPTION MOUNTING
(LAXX-LB)

FORM CO
ASSEMBLY BOARD
CP-2106

Figure 12

Installation of Forms Control Option Kit
(LAXX-KV)

1-33

FORMS CONTROL, VERTICAL TABULATION,

AND HORIZONTAL TABULATION,

screws, #6 flat and lock washers and secure from

OPTION KIT (LAXX-KY)

the inside as in (4).

The Forms Control, Vertical Tabulation, and Horizontal
Tabulation

Option

Kit

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

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

contains

the

The

top-of-form

cable

has

two

distinct

ends,

differing by the length of the wire leads and the

Forms Control

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

Option Kit (LAXX-KV) and the following:

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

Quantity

Item

1
1

end to the HT-VT-TOF module board. Connect

Part Number

the

two

push-on 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

Board

Install the top-of-form control assembly using the

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 (2). Then secure with two

Screws (#4-40

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

X 3/8in.)

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

Phillips Pan Head

9006022-1

Screws (#6-32

X 3/8in.)

Feed the cable down through the access hole and,
using the existing cable clamps, conform the cable

Edge Connector

B-UA-H851-0-0

Lock Washers (#4)

9006688

Lock Washers (#86)

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.
A Phillips

screwdriver

is the only tool

required

for

Install the H851 edge connector (7) in location A
(edge connector and board are keyed for proper

installation. Use Figure 13 and the following procedure

fit) and the 8-pin connector (6) and two push-on

as installation guides.

connectors as shown.

1.
2.

NOTE

Unplug the ac power cord and remove the top

Only one H851 edge connector is needed. Do not

cover.
If

not

already

installed,

install

the

install two connectors.

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

into the existing options.

Unscrew

the

attaching

the

Perform

_
1.

hardware

—

the

following

procedure:

Forms Control Option

bell

Load paper, energize the DECwriter, and set the

FORM
4.

Installation

LENGTH

switch to

correspond to the

length of the form in inches. Press and release the

speaker. Save the two #6 flat washers and two

SET TOP OF FORM pushbutton.

#6-32 X 3/8-in. screws but discard the Kep nuts.
2.
5.

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

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

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

distance

1-34

that

is equal

inches

to the switch

EXPANDER OPTION

MOUNTING KIT

(LAXX-LB)

TOP OF FORM
VERTICAL & HORIZONTAL
TABS ASSEMBLY

BOARD

CP-2107

Figure 13 Installation of Forms Control, Vertical
- Tabulation, and Horizontal 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 head will move to column 132.

Set the FORM LENGTH switch to 3, and press the

The printed characters will be in two lines with the

SET TOP OF FORM pushbutton. Press the LINE

top line one character space to the right of the

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

second line.

should increment only one line.

23.
After ensuring
Control

correct operation

Type

of the Forms

RETURN,

type

TAB

twice,

then

press

BACKSPACE ten times.

function, set the TOF for 11-in. form

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

24,

Type TAB; type “G."”

Type an A"’

25,

Type TAB; type “H.”” The characters ‘G’" and
“H' will overprint on the previously printed “E*

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

and “F.”

Type a “'B.”
26.

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

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

then type a ““C."”

head

will

move

column

132.

The

test

completed.

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

AUTOMATIC LINE FEED OPTION KIT (LAXX-LA)

paper back until the print head aligns at the line
where “‘B’’ was printed.

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

to previously printed ‘‘C’’).
10.

11.

Auto Line Feed Board

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

Edge Connector

B-UA-H851-0-0

to previously printed ““D’’).

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.
12.

Type CTRL K;

Type LINE FEED, RETURN, and TAB. The print

RETURN, then press the space bar eight

times.

15.

Type ESC 1, then type “A."”

16.

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

screwdriver is the

only

tool

required for

as installation guides.

1.
Type

Phillips

installation. Use Figure 14 and the following procedure

head will move to the right margin (column 132).
14.

9006688
9006655

the print head will align on the line

containing D" and “F."”
13.

Lock Washers (#4)
Flat Washers (#4)

Unplug the ac power cord.

not

already

installed,

install

the

Expander

Option Mounting Kit (LAXX-LB).

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

into the existing options.
17.

18.
19.

Space eight times; type ESC 1; type “C.”"

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

Type RETURN; type LINE FEED.

0.38-in. screws and #4 washers), secure the Auto

Type TAB; type “D."”

expander board. As shown, one of the mounting

Line

Feed

board

in locations C and

holes should not be secured.

1-36

D on the

EXPANDER

OPTION %OUNT!NG
‘ AXX*

‘

NO SCREW
AUTO LINE FEED

BOARD

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

Energize both terminals; set both to the same baud

type

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

rate,

line

mode,

SELECTIVE ADDRESSING OPTION KIT (LAXX-KW)
The

Selective

Addressing

Option

Kit

contains

following:

and

full

duplex

operating

conditions.
NOTE
In the following procedure, the terminal with the

the

Selective Addressing Option is designated as ‘A"
and the terminal without the option designated

Quantity

Item

Selective Addressing

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

On terminal A, the front panel SELECT AVAIL

| D-CS-M7737-0-1

Phillips Pan Head

IJB'IW

Part Number

light is illuminated.

9006401-04

Nylon Screws

(#4-40 X 0.38 in.)

AVAIL

EIA Interface Cable

type

Unplug the ac power cord.

not

already

installed,

install

the

Expander

integrate

the

CTRL

terminal

The SELECT
lights

will

Both

terminals

type

CTRL

can

send

and

D. The

DEVICE

by A. The SELECT AVAIL light on terminal A
extinguishes. A cannot send or receive.

Selective

Addressing

Option into the existing options.

SELECT

Type any character on terminal B; it is not printed

Refer to Figure 8 for the correct interface cabling
required

CTRL

SELECT light extinguishes.

Option Mounting Kit (LAXX-LB).
3.

type

DEVICE

receive.

as installation guides.

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

required for

installation. Use Figure 15 and the following procedure

and

illuminated on terminal A.

| C-1A-7010489-0-0

A Phillips screwdriver is the only tool

terminal

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 G

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

Installation
— Perform

the

following

10.

procedure:

On terminal B, type any characters. The SELECT
AVAIL

1-38

light on terminal A extinguishes.

EIA OPTION

(LAXX-LG)

SELECTIVE

AGDRESS%NG

M7728

LOGIC BOARD

EXPANDER

OPTION MOUNTING
KIT (LAXX-LB)

CcP-2109

Figure 15

Installation of Selective Addressing
Option Kit (LAXX-KW)

11.

12.

On terminal B, type the group select code that was

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.

On terminal B, type CTRL B. Terminal A can

23.

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

24,

NOTE
through

18 set

up terminal

A as a

entered

into

terminal

extinguishes

type

CTRL

and

The

SELECT

light illuminates on terminal A.

The

Auto

Answerback

Option

Kit

contains

the

following:

the

DEVICE

SELECT

light

Quantity

item

Part Number

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

terminals can send and receive. |f the Answerback

Edge Connectors

Option is installed in terminal A, the answerback

B-UA-H851-0-0

Phillips Pan Head

9006011-1

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

Screw (#4-40 X
0.38 in.)

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

light

extinguishes

AVAIL

light illuminates.

Steps

19 through

and

the

SELECT

Lock Washers (#4)

9006688

Flat Washers (#4)

9006655

is the only tool required for
installation. Use Figure 16 and the following procedure

set up terminal

as installation guides.

A as a

uniquely selected slave (case 2).

Repeat steps 14 through 16.

Unplug the ac power cord.

not

already

installed,

install

the

Expander

Option Mounting Kit (LAXX-LB).

On terminal B, type CTRL E, then any character

(A’s DEVICE SELECT extinguishes), then CTRL

Refer to Figure 8 for the correct interface cabling

B. Terminal A can receive but not send.

required

integrate

the

Auto

Answerback

Option.

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

A Phillips screwdriver

NOTE

21.

Then

(LAXX-KX)

typed.

20.

receive.

SELECT

AUTOMATIC ANSWERBACK OPTION KIT

message will print on terminal B after CTRL E is

19.

A’s code again. The

the switches on the Selective

illuminates.

18.

and

light on terminal A extinguishes.

Addressing circuit board installed in terminal A.

17.

and

DEVICE

AVAIL

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

16.

On terminal B, type any characters. The SELECT
AVAIL

15.

CTRL

On terminal B type CTRL B. Both terminals can
send

uniquely selected slave (case 1).

14.

type

DEVICE SELECT light illuminates now.

AVAIL light illuminates.

terminal A extinguishes. Then

DEVICE SELECT light on A does not illuminate:

then

Steps

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

receive from B, but not send.

13.

light

light illuminates.

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

NOTE

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.

1-40

M7728
LOGIC
BOARD

EXPANDER
OPTION MOUNTING
KIT (LAXX-LB)

AUTOMATIC

ANSWERBACK
BOARD

CP-2110

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

connectors and board are keyed for proper fit.

to the signal source.

Enter the answerback message using the 7 slide

The EIA circuit board has two wire jumpers that allow
selection of the type of BREAK and DATA TERMINAL

switches on the 20 character switches. Use the

standard ASCIl 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

corresponds to b1 of the 7-bit character.

following four terminal conditions produce the output
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 (005g) 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

and type RETURN;
should occur.

EIA INTERFACE OPTION KIT (LAXX-LG)

ElA Output Signal

Item

Out

None

230 ms BREAK on Transmit

QOut

DATA TERMINAL READY
Disconnect

Part Number

NOTE
The EIA board is shipped with both jumpers installed.

EIA Interface Assembly | D-1A-7011828-0-0
Phillips Pan Head

Out

Data Line

The EIA Interface Option Kit contains the following:

Quantity

a carriage return and two line feeds

NOTE

9006037-1

The

Screws (#8-32 X

CARRIER

TERMINAL

0.38 in.)

DETECT

signal

can

cause a

DATA

READY disconnect regardless of jumper

Lock Washers (#8)

9006690-00

presence.

Flat Washers (#8)

9006660-00

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

Numeric Pad Cable

C-1A-7008612-0-0

Standoff Spacers

900928500

Kep Nuts

9006563-00

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
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

CP-2111

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),

Replace and secure the plastic housing. Replace

and spacers (2) that

the cover and install paper.

secure the keyboard bezel to the cabinet base.
Test After Installation — Apply power and place it in

Turn 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
panel,

replace

keyboard,

all
and

three

assemblies

numeric

pad)

(control
on

their

respective standoffs and secure with the Kep nuts.

Provide

adequate

cable

clearances

around

C-MD-7414951-0-0

1211583-02

Socket Head Cap

9006350-8

Screw (#10-32

all

standoffs.

X 1in.)
1
CAUTION

Ensure that all

Pulley Clamp

Timing Belt

Hex Socket Set

9007722-10

Screw (#%-20)

insulating washers are installed

Kep Nuts

9006565-00

between the Kep nuts and the etch side of the

C-MD-7415010-0-0

circuit boards. Failure to insert washers at required

Right-Hand Spacer

points may cause circuit damage.

| Channel Strip

9007036-00

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

torque-type Phillips screwdriver. Use Figures 18 and 19

and 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-2113

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).

Recheck the gap at the center. The gap should be

14,

Install the new 30-tooth timing pulley

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 previously removed pulley clamp.

assembly bracket is between 0.005 and 0.010 in.

17.

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

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

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

do not tighten the four mounting screws.
10.

inserted

Set the Carriage Adjustment lever to the minimum

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 end of the side bracket and

between the bracket and the carriage shaft. When

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

functions are unaffected.

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

PAPER OUT OPTION KIT (LAXX-KZ).

print head snug against the feeler (Figure 19).

The Paper Out Option Kit contains the following:

CAUTION
Ensure that the feeler gauge rides between the

Quantity

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
cause the carriage

Paper Out Cable

Micro Switch Assembly|

D-MD-7412424-0-0

Phillips Pan Head

9008033-1

9/16 in.)
-2

Kep Nuts (#4-40)

9006557

Flat Washers (#4)

9006655

Tie Wraps (5-% in. X

9007880

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

1/8in.)

CAUTION
Do not apply more than the recommended torque
when

tightening

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

the print head screws or the

recommended tools for installation. Use Figures 9 and

moulded inserts in the carriage assembly may be

damaged.
13.

C-1A-7011657-0-0

Screws (#4-40 X

shaft to bow,

resulting in more than 0.012 in. of clearance.

12.

Part Number

force on the print head when making the adjustment; it will

Item

20 plus the following procedure as installation guides.

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

BE TIGHTENED 10 £ 2

0.012

PRINT HEAD

PRINT BAR

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Lot
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IN./LBS. OF TORQUE

FEELER GAUGE

G
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Wt
e

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.."

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CAUTION
ENSURE THAT FEELER GAUGE IS INSERTED
BETWEEN THE PROTRUSIONS ON THE
PRINTHEAD. FAILURE TODO SOWILL RESULT

IN IMPROPER CLEARANCE AND SHORTEN
THE LIFE OF THE PRINTHEAD.

Figure 19

Print Head Adjustment

i
e
e

CP-2114

Figure 20

Installation of Paper Out Option Kit

(LAXX-KZ)

1-48

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

A Phillips screwdriver is the only tool

mount,

installation. Use Figure 21 and the following procedure

but do not tighten, the PAPER OUT

switch (2) on the paper guide.
3.

required for

as installation guides.

Connect the cable end (4) having the two smaller
1.

connectors to the PAPER OUT switch as follows:

Disconnect and remove any previously connected
data input line.

black to bottom, white to top.
4.

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

Form the paper out cable along the keyboard

connect it to J3 on the M7728 logic board.

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)

Secure the cover plate (3) using the two pan head

screws and associated washers (2). Position the

that

cable (1) as shown.

secure the keyboard bezel to the cabinet base,

Turn the bezel upside down on a piece of foam,
7.

Using the needle-nose pliers, attach the paper out

Connect the

cable white lead to the frontmost connector and
then the black lead to the other connector.
8.

input

end

the

cable

assembly to the signal source.

Test After Installation — Send data into the DECwriter;

Insert a piece of paper up through the paper guide.

the printout should verify a correct installation.

Plug the DECwriter into an ac source and then

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

energize the unit.

Manually
ensure

activate

proper

the

PAPER

connections.

OUT switch to

The

fmnt

The 20 mA Cable Option Kit contains the following:

panel

PAPER OUT switch should illuminate and extin-

Quantity

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

Item

Part Number

connections.

10,

Adjust the PAPER OUT switch so that the PAPER

Cable (2838

OUT light is extinguished when paper is correctly
installed.

Remove

the

paper;

the

N-Lok Connector)

light should

illuminate. Continue to readjust the PAPER OUT

switch until the proper indication is achieved in

both states.
11.

Cover Plate

C-MD-7413216-0-0

Phillips Pan Head

9006037-1

Screws (#8-32 X

0.38 in.)

Replace the housing and top cover.

Test After Installation — Check for the cmrrect: indication of the PAPER OUT display light when approxi-

Flat Washers (#8)

9006660

Lock Washers (#8)

9006634
required for

installation. Use Figure 22 and the following procedure
as installation guides.

20 MA CABLE OPTION KIT (LAXX-LH)

The 20 mA Cable Option Kit contains the following:

Item

A Phillips screwdriver is the only tool

mately 2 in. from the end of paper.

Quantity

D-Al-7009212-1-0

Connector to Mate-

Part Number

Cable

| BCO5F-15

Cover Plate

C-MD-7413216-0-0

Phillips Pan Head

9006037-1

Disconnect the remove any previously connected

data input line.
2.

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

thmugh

the

access

hole

the floor and

connect it to J3 on the M7728 logic board.
3.

Secure the cover plate (3) using the two pan head
screws

Screws (#8-32 X

and associated washers (2). Position the

cable (1) as shown.

0.38in.)

Flat Washers (#8)

Lock Washers (#8) | 9006634

9006660

Connect

the

input

end

assembly to the signal source.

the

cable

CP-2118

Figure 21

Installation of 20 mA Cable Option Kit
(LAXX-LH)

1-50

cpP-2118

Figure 22

Installation of 20 mA (DEC 10) Cable

Option Kit (LAXX-LK)

1-51

Test After Installation — Send data into the DECwriter;

The

the printout should verify a correct installation.

minimizes glare and reflections. The shield mounts

light shield (4)

is a flat-black surface that

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

SCALE, POINTER, AND WINDOW OPTION KIT

backing and position on the cover.

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

The column scale (5) adheres to the lip on the

following items:

Quantity

Item

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

After loading paper, energize and place the DEC-

Screw (#4-40 X

writer in the local mode.

3/8-in.)
1

Flat Washer (#4)

9008172

Lock Washer (#4)

9006632

A Phillips screwdriver is the

installation.

only tool

Type the letter “'N"’ five times.

required for

Use Figures 2 and 23 plus the following

procedure as installation guides.
1.

Affer the Last Character Visibility (LCV) shift,

10.

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*’

11.

typed should align over the right edge of the line

indicator as shown in insert B of Figure 23. If

Install the line indicator (1) on the print head
assembly

using

Remove the

the two

screws,

front

insert

Phillips

necessary, loosen the two screws that secure the

screws.

line indicator to the print head and correct the
alignment.
|

the line indicator

beneath the ribbon (do not interfere with the
ribbon’s path), then secure with the screws.

- After aligning the line indicator, close the cover,

12.

The column pointer (2) and its associated spacer

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,

open the cover and loosen the screw that secures
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

washer (3).

12 and
~

13 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

to be too high above the
remove

the

spacer

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.

1-52

COLUMN
'SCALE POSITIONING

INDICATOR

cpP-2117

thure 23 Installation of Scale, Pointer, and Wmdow
Option Kit (LAXX-LN)

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

After removing the Paper Advance knob from the

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

1/4-in.)
Phillips Pan Head

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
~

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

discard the sleeve (5), 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

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).
3.

The cable assembly (4) should be soldered to the

Test

wired assembly as in Figure 24.

Connect the cable connector to J4 on the logic
board.

insert the DF11 communications option into the

After

Installation — Perform

the

following

procedure:

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

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.

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

Before removing the telephone handset from the

the tractor drive shaft to minimize mechanical noise

muff assembly, place the DECwriter in the local

generation during a paper advance. A Phillips screwdriver

mode. This action prevents the disconnect noise

is the only tool required for installation.

from causing printing of random characters.

1-54

Schew

©-”

)

* »* * [ 3
.

“

B s

BB2 (BLUE)-12V

S
.

BA2 (RED) #5V
BD1 (VIOLET) RCVD

DATA TTL

h’"n

BN2 (GREEN) +12V
o

BT1 (BLACK) GND

BV2 (YELLOW) XMTR

DATA TTL

CP-2118

Figure 24

Installation of DF11 Adaptor Mounting Kit

1-66

Cp-2184

Figure 25

Installation of “O"" Ring on Tractor
Drive Shaft

CARRIER

INDICATOR

LOGIC BOARD

CP- 2190

Figure 26

Installation of Acoustical Coupler Option Kit
(LAXX-LM)

1-56

'SECTION 2

LA35 USER’'S INFORMATION

LA36 GENERAL INFORMATION

INTRONJCTIQN

The LA35 DECwriter is a medium-sized, low-cost printer for use as a lmal or remote printer only. Itis capable m

handling multipart and multiform line printer paper from 3to 14-7/8in. (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 DECwmm aan be axpmded to provide the user with a number of functional options for receiving
and handling data. These functional optionsare descrikped in the following table.

Option

‘Name

LAXX-LB

Expafldar, Option
Mount

fiamimim

Opt:m Moummg Kit mc;ludes the logic, cables

and moummg hardware required to expand the LA35 to am‘:flude
options

LAXX-LA,

LAXX-KV,

LAXX-KW,

LAXX-KX,

LAXX-KY, and LAXX-PK.

LAXX-PK
LAXX-LA

APL/ASC! I Dual

Thzs option pmwdas an APL alternate character set for use with

Character Set

the standard character set in the LA35.

Auto LF After CR

The LAXX-LA option causes the printer to execute a line feed
after each received carriage return code.

LAXX-KV
|

Top of Forms

Control

Controlk maunted 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

Selective Addressing

The Selective Addressing Option allows the LA35 to operate with

LAXX-KX

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

~cmmr termmais on a smgm data cmmmwimm*? channel.

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,

‘The Forms and Tabbi ng option enables the printer to set
horizontal and vertical tab positions via the system software. This

Horizontal Tabs

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

EIA/CCITT Interface

The LAXX-LG EIA/CCITT interface provides the user with an
- 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 DF1 1 communication optmns in the LA35

LAXX-KJ

Font Option is a mechanical

Compressed Font

The Compmss&d

Option

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

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

Modem Protector

BPO DATEL services interface that meets the requirements of
-

CCITT (V28), with BPO-required modem pmtectmn 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 DE010

LAXX-KG

EIA Interface

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

with a standard EIA connector.

LAXX-LN

LA35 DECwriter

Scale, Pointer, and

Operator convenience items that assist in positioning the print

Window Kit

head on preprinted forms and for locating horizontal tabs.

MODEL VARIATIONS

The LA35 variations and associated model numbers are
listed below.

ERUT

detailed description of these jumper modifications and
the

associated

cabling

required,

refer

DECwriter Maintenance Manual.

the LA35

LA35-CE

90-132 V, 60 Hz

LA35-CF

180-264 V, 60 Hz

LA35-CH

90-132V,50Hz

The LA35 is configured with no parity and no parity

LA35-CJ

180-264 V, 50 Hz

error printout. To modify this configuration for odd or

LA35-DE

90-132 V, 60 Hz

‘even parity with or without error printout, jumpers on

LA35-DJ

180—-264 V, 50 Hz

LA35 Parity

the

logic

board

must

changed.

For

detailed

description of these jumper modifications, refer
to the
o

LA35 DECwriter Maintenance Manual.

LA35 JUMPER CONFIGURATIONS

oh5

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

this

configuration

for

active

operation,

jumpers on the logic board must be changed. For a

by removing a jumper. For a description of this jumper
modification, refer to the LA35 DECwriter Maintenance

Manual.

LA35 SPECIFICATIONS
Printing

Switch

Interface

selectable:

10, 15, or 30 characters/second

throughput

Integrated or 20 mA current loop or EIA/CCITT.

132 ahawctm mammum *

Spmmm

10 ahmmcwm/m (hmamnmt) i

6 lines/in. (Wrtma!)

Chamwm |

96 upmr/mwm case ASCH

160 w m;ammum hdw) w

7 X 7 dot matrix (0.07 X 0. mm (1.77 X 2.54 mm)

Temperature

Paper

Operating

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

15 |Ib paper minimum

Card stock thickness of 0.010 in.

(0.25 mm)

maximum

Operating

2- to 6-part (see Notes)

10 to 90% with a maximum wet bulb temperature

Thickness of 0.020 in. (0.50 mm) maximum

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

Tractor-drive, pin-feed

Nonoperating

NOTES
Multipart forms may have only one card part. The

card must be tha last part,.

NCR or 3M paper, up to 6-part, must use ribbon

recommended.

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

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

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 lineis on one margin only). Do not
line glue both margins as air will not be able to
escape and poor impressions will result.

5 to 95%
Dimensions

on top copy. First surface impact papar is not

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

Multipart:

10° t0 40° C (50° to 104° F), noncondensing

Nampemts ng

27.5 in. (69.85 cm) wide

33.5 in. (85.09 cm) high
21.7 in. (55.12 cm) deep
Weight

97 Ib (44.09 kg)

T Indicator
i

tch

when

OUT indicator, when illuminated, gives a
visual indication that the LA35 is out of paper. Printing
stops when the out of paper condition is detected.

The LINE/LOC switch is a 2-position operator control
switch.

When in the LINE position, the LA35 is enabled

to receive data.

en in the LOCAL mode, the LA35

receive line is disabled and only local operation can be

performed.

ER switch connects and disconnects the line
voltage to the

LA35 DECwriter. The POWER switch

should be in the ON position for normal unit operation.
o

hen

RATE switches select the rate at which

changing

paper,

ribbon,

or adjusting the print

head, the switch should be turned OFF.

characters are received over the communication line.

haracter

10 (characters/second)

0 (characters/second)
110 and

300
.

‘

15 {characters/second

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

Carriage Adjustment Lever

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

CARRIAGE

per Advance Knob
The Pape r Advance k nob pushes in to disengage the | [ ne
.

feed gear train, all owing f ine ve rtical
5

paper posi t ion .
i

adjustment of

Coarse vert ica | adjus tment is achieved by
it

51 mply turning the knob. Each detent turned represents
0

ADJUST PAPER

VERTICALLY

zmw

AND TURN TO

| ;&0.»,

KNOB

7595-4

2.5

Tractor

Adjust Kno

The Tractor Adjust knob

ne horizontal adiust-

/%4’%‘! oI

ment of forms.

TRACTOR

_ADJUST
L0y

7595-7

Bell
The bell indicates that a bell code was received.

JISING THE LA35

Set the BAUD

Using the LA35 requires almost no operator intervention. These few steps are all that may be required to

RATE switches to the applicable

baud rate.

place the LA35 on-line.

»@‘

The LA35 is now on-line and fully operational.

Load paper.

Set the LINE/LOC switch to LINE.

LA35 INSTALLATION AND CHECKOUT GUIDE
GENERAL INSTALLATION INFORMATION

Install

This section contains the step-by-step procedures for

(Section 3).

ribbon per ribbon installation procedure

unpacking and unit checkout to ensure that the unit was
not

damaged

during

shipment and that the unit is

Install paper per paper loading procedure (Section

operating properly prior to connection to the com-

munication system.

3).

|
CAUTION

The LA35 DECwriter should be installed in an area that

Before connecting the LA35 to a power source,

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

ensure that the line voltage and frequency are

vapors. To ensure that the unit has proper ventilation

compatible with the power requirements of the

and cooling, the ventilation openings on the side of the

machine. Ensure that the POWER switch on the

cabinet should not be obstructed.

console is OFF.

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

Connect the LA35 line cord to the correct wall

page.)

receptacle; press the control panel POWER switch

on the ON position. The print head automatically
UNPACKING AND REPACKING

Unpack

the

LA35 as

positions itself to the left margin.

described in Section 3. If it

becomes necessary to ship the LA35 to another site,

Set the BAUD RATE switches to the applicable

refer to the repacking procedure described in Section 3.

baud rate.

CHECKOUT AND ACCEPTANCE PROCEDURES

Set the LINE/LOC switch to LINE.

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

Run the applicable software and observe printout

Section 3.

for the desired results.

2.7

27.5"

(696 mm)

—

]

(335"

(851 mm)

[

21.7"

({ 551imm)

25.0"

(635mm)

e
—
|

SERVICE

AREA

I
§
I

— e

.¥

[~ ——
;

DIMENSIONS

A|lB|C|D

~°~“—‘1‘

|E]|F

INCHES

275 14 |21.7 [v*| 96

MILLIMETERS

696|356| 551

|v¥* [2440

* CURRENT LOOP CABLE (BCO5F) LENGTH IS
15 FT, E1A CABLE LENGTH IS 9FT
(2744mm)

’
§
|
|

I
I

SERVICE
AREA

|
l

b e e e eJ
CP-2021

LA35 Site Considerations

CONTROLS AND INDICATORS FOR

The following options include additional controls not

The

column

indicator

used

conjunction

present on basic LA35 DECwriters.

with the column scale. There are red and green

FORMS CONTROL OPTION (LAXX-KV)

cate the next column to be printed. The green

indicator lines on the column indicator to indi-

This

option

control

requires

assembly,

the

which

addition

of a top-of-form

line is used before the Last Character Visibility
shift, the red line after the shift.

is installed beneath the top

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

trols

this

assembly:

SET TOP

FORM

and

FORM LENGTH (Figure 27).
L

SET

TOP

FORM

clears

the

previously

loads

the

current

There is a single indicator associated with this option.

pushbutton

that

loaded

form

length

and

setting

the

FORM

LENGTH switch.

FORM LENGTH

This

red

the

cover

indicator

and

mounted

lights when

the

right

telephone

side

handset is

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

is a 12-position rotary switch

that is used to preset a form length (in inches)
into the Forms Control.

FORMS CONTROL, VERTICAL TABULATION, AND

HORIZONTAL TABULATION OPTION (LAXX-KY)
This

option

also

utilizes

the

top-of-form

control

assembly (Figure 27).
SCALE, POINTER, ANDWINDOW OPTION

(LAXX-LN)
This option contains three indicators: Column Scale,
Line

Indicator,

and

Column

Pointer

shown

Figure 28.

The column scale is a 17.25-in. long strip that

marked off in

possible

column

Figure 27

132 divisions representing the
locations.

The

column

Forms Control Assembly

scale

adheres to the plastic print window.
B

The

fline

indicator

mounts

the

GREEN

POSITION OF

head

and is used to establish two printing locations.
The longer top surface indicates the baseline of

NEXT CHARACTER
TO BE PRINTED

CHARACTER

M”M

COLUMN
~ POINTER

BASELINE

the characters in a particular line. When setting
up

form

rolling

back

previously

printed line, this top surface is used to exactly

align where the

next character will

smaller surface on the right side
position

where

the

print. The

character

will

included

line indicator is also

in the APL/ASCII Dual Character Set

Option (LAXX-PK).

TM SPACER
(IF NEEDED)

print.

This position is valid only after the Last Character Visibility shift. The

indicates the

LINE INDICATOR
Figure 28

CP- 2099
Line Indicator and Column Pointer

LA35 options requiring setup or operating instructions

while the printer mechanism is positioning the

in addition to those instructions given for the basic

form. The best way to determine the required

LA35 are presented in the following paragraphs.

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

APL OPTION (LAXX-PK)

An LA36 DECwriter containing this option can print

characters. In character combinations when the

either the standard ASCII characters or the alternate

character buffer is empty prior to a carriage

APL characters. Character set switching is controlled by

return, 15 fill characters can be subtracted from

either a Switch In or Switch Out command. Switch In

the above number. All fill calculations are made at

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

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

off to the next higher number); for 110 baud, use
one third (round off to the next higher number).

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

Figure 29 shows the bit assxgnments for both character
2.

sets.

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

FORMSCONTROL OPTION (LAXX-KV)

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

:';";,(TheDECwriter is assumed to bedeenergized.)
Measure the forr ;f“tm‘ determine its lengthin inches. Then
remove thee tap cover from the LA36 as in the paper

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

the second Form Feed command and skip one full
form length. If the second Form Feed command is

!oadmg pmmdums On the F&wm Cantmlpanel, set the

issued with 17 or more lines remaining to the

FORM LENGTH mmrv swe‘tchto the number that

bottom of the present form, it will be ignored.

cmrr%pmda ininches, to the !mmhof the form (Table
3). Proceed wn[;’; the normal loading of the forms. When

within one form interval will not be recognized.

Like- wise, more than two Form Feed commands

comwewd usetha,,_;z,ar Advance knob to align the top

line of tm form with the prmt head. (Namaliv the top

Table 3

line is 2 or 3lines bemw thepea’f‘oration, but it can be

FORM LENGTH Switch Positioning

e:ambwhedat any line on the form.) Close the top cover

and amrgm the DECwmer Tmfmm length indicated

FORM

bythe F.flM LENGTH &wamhm wmmmmalw entered

Form Length

LENGTH

(inches)

durmg tha pmwawp sequence.

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

5.5
6

33
36

after the form length is selected.

5.5
6

Operation — The program-generated Form Feed (FF)
command is 014g. Upon receipt of a Form Feed

command,

the

paper

will

advance

the

8.5

top-of-form line.

FORM CONTROL PROGRAMMING

Printable Lines

Switch Setting | Per Form {(Maximum)

8.5

42
|

48
-

NOTES

To avoid losing incoming characters during a form
FORMS CONTROL, VERTICAL TABULATION, AND

control operation, fill characters must be added.
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

ait, bs

'’

b | b|
:

}

Rowil

NUL

| DLE | SP
!

STX | DC2
DC4

ENQ | NAK

EOT

BEL

ETB

CAN

EM
SUB
11

GS
RS

| ESC

| s

DEL

a. Standard (ASCII) Character Set

-4

il :

v M

wifififi,‘aNBMfim,;,-

-2l e lolalalolalulelo|z]=]2]x]lalz]lz]e

b. Alternate (APL) Character Set

Figure 29

Bit Assignments for ASCII and APL
Character Sets

2-11

Forms

Control

Setup
— Exactly

the same as

in the

Then space the

Forms Control Option (LAXX-KV).

The

number

zontal

tab. To store this line count, issue 033g and

codes 0338‘

063g.

tabs

that

can

set

printable

lines

the form

11-in.

the

same

manner.

is limited

The

number of

by the

number of

used.

are

cancelled

(cleared) during

sequence.

tab

move. To clear all

horizontal

tabs,

issue

then 0628‘ All horizontal tabs are can-

deep form could have up to 66 vertical tabs.

tabs

be set is

HORIZONTAL TABULATION PROGRAMMING

For example, an

NOTES

To ensure against loss of data while the printer

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

tabs that can

celled (cleared) during a power-up sequence.

Advance the form to the next vertical tab and store
in

horizontal

up to 132 tabs. Command 0118 will initiate a hori-

the form to the desired location of the first vertical

location

the form. For example, a 17-in. wide form can have

setup and, after establishing the top-of-form

position, issue Line Feed commands (0128) to move

this

next desired tab

_limited by the available number of print columns on

Vertical Tabulation Setup
— First perform the Forms
Control

print head to the

location and store this location in the same manner.

mechanism is executing horizontal tabs, fill char-

power-up

acters are used to effectively slow up incoming

data.

The

number required is determined by

multiplying the number of spaces between tabs by
VERTICAL TABULATION PROGRAMMING

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

NOTES

whichever is greater. The 12 fill characters are

needed to compensate for the maximum carriage

Similar to the form feeding sequence, the ver-

return time. In instances where the tab does not

tical tabulation action requires fill characters to

slow up the input data while the mechanism is
advancing

before

the

form.

Use

determine

the

same

number

rule

fill

carriage

return, only 0.55 times the

number of spares are needed for fills.

All fill

calculations are made at 300 baud. For 150 baud,

halve the value

characters.

(round off to the next higher

number); for 110 baud, use one third (round off
to the next higher number).

If a Vertical Tab command (0138) is issued and
there are
perform

no tab locations set, the
a

form

feed

(FF)

and

LA35 will

advance

the

paper to the next top-of-form location.

Once

a vertical

aborted.
issued

tab

has

begun,

lines

from

vertical

tab

tical

Tab command

lines

remaining

be ignored.

location.

If a

aborted.

not stop

second

present advance,

zontal

Ver-

setting

If a second

Horizontal Tab command is issued with 17 or
more spaces’ remaining in the present advance,
it will be ignored. Likewise, more than two
Horizontal Tab commands within one tab
interval will not be recognized.

be recognized.

Setup
— Before

tab stopping position, the head will not

the second horizontal tab location.

it will

Likewise, more than two Vertical

Tabulation

Horizontal Tab command

stop at that next position, but will advance to

Tab commands within one tab interval will not

Horizontal

If a second

is issued within 16 spaces from the next hori-

is issued with 17 or more

in the

is received and

Once a horizontal tab has begun, it cannot be

the next vertical

at that next position, but will advance to the
second

Tab command

will advance to column 132 and remain there

cannot

tab stopping position, the paper will

Horizontal

~ until a carriage return is received.

If a second Vertical Tab command is

within

there are no tab locations set, the print head

hori-

zontal tabs, issue a carriage return {code 01 58). This
ensures that the print head starts at the left margin.

AUTOMATIC LINE FEED OPTION (LAXX-LA)

Issue space characters (by code 0408) until the print

The

head

presence of jumper W1

location.

positioned

the

this

location,

store

desired

horizontal

issue

codes

tab

Auto

Line

Feed

action

controlled

the

on the auto line feed assem-

bly circuit board. Table 4 shows the various condi-

0338

tions that produce the specified number of line feeds.

2-12

When W1

is not cut out, the DECwriter will auto-

- matically

insert

Line

Feed command after each

Carriage

Return

command received. This

NOTES

Spaces are counted as characters.

a con-

venience 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

Messages

shorter

than

characters

can

terminated by making the last character

a NUL

(0000000). All remaining characters are disre-

Line Feed Option circuit board.

garded.

A full

20-character

message

does

not

require a NUL at the end.
The Automatic Answerback Option also contains the

Table 4

operational

Auto Line Feed Setup

Option

Jumper W1

Initiating

Inor Out

Action

Line

Answerback

Feed

circuit

Produced

auto

Receive CR without LF

Receive CR with LF

Receive CR without LF

cut out to eliminate certain operations of the
line

feed

function.

The

possible

jumper

configurations are:

Jumpers

Action
Add LF to

Received CR

N/A

Out

N/A

Yes

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
be performed by the printer.
With jumper W1

inserted,

spacing fill character

a nonprinting, non-

must be sent after each

one character is required after each carriage
return to ensure

loss of data dm’ing the

machamml actmn of the printer.

AUTOMATIC ANSWERBACK OPTION (LAXX-KX)
programmable character locations. This stored message

when

The Selective Addressing Option has two 7-bit DIP
mounted

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

The Auto Answerback Option provides for up to 20
is transmitted

SELECTIVE ADDRESSING OPTION KIT (LAXX-KW)
switches

carriage return. An idle (marking) line time of

ENQ (005g) command is

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 ASCII control codes may cause other unde-

received.

sired systems operation. When group selecting, there
is no limit to the number of terminals that may be

The message is stored in twenty 7-bit slide switches

in the group.

located on the Auto Answerback board as shown in

Figure 30. The 7-bit ASCIl code for the letter ““a” is
also shown. Slide switch No. 1 corresponds to bl
and

the

position

(high) logic state.
~

Automatic

Auto

board contains two factory-installed jumpers that can

'NOTES

the

The

Line Feeds

AUTOMATIC LINE FEED PROGRAMMING

Number of

| Receive CR with LF

Out

features

(LAXX-LA).

Any legitimate ASCIl

corresponds

asserted

|
character can be included in

The

inherent receive-only characteristic of an

establishes

the

terminal

LA35

slave when connected

into a multipoint communications network. There are

three possible slave states as follows:

Broadcast Slave — A condition that allows all

the answerback message, including commands, alpha,

terminals in the network to receive data trans-

or numeric characters.

mitted by the master.

< —

a.:1100001 -

o <1
4 O -L o
ob

ce -2101

Figure 30

Location of 20 Answerback Message
Characters

2-14

ADDRESS SWITCH

UNIQUE

ADDRESS SWITCH

‘

cr-2189

Figure 31

Location of Address Setting Switches

2-15

MASTER
TERMINAL

BROADCAST SLAVES

(ALL &)

GROUP SLAVES

(1,2,863)
|

UNIQUE SLAVE
(JUST
# 3)

SLAVE TERMINALS

CP-2188

Figure 32

Group

Typical Selective Addressing Communications
Network

Select Slave — When addressed by the

they do not acknowledge their addresses, even though

‘master using the group address entered into the

the address is present on the communications line.

Group

The master terminal establishes whether the slave ter-

Select switch

the

option

board, a

particular group of terminals can receive data sent

minals are in one mode or the other.

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

The following six commands are generated at the master

they are within the same communications network.

terminal and control the operation of the slave terminals
in the communications network.

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

address code. When addressed using this unique
code

a 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.

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

Figure 32 depicts a communications network of seven

terminals

terminals. It is assumed that terminal A is the master

address mode

and

the

other six

are slaves,

the

data

mode

the

unique

place. This allows a master to select additional

devices without having to surrender the lines or

address while 4,

having to readdress previously selected stations. To

and

with

from

and terminal selection can take

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

each

switch

6 have a different group

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

continue

addressing

additional

terminals,

the

all terminals print the transmission. When the master

normal selection rules apply, with the sequence

addresses the three having the same group address,

terminating with 002g to lock all devices into

only these three receive the transmitted

either the selected or unselected mode.

data. The

master can also use the unique address of one of the

six to establish communication while the other five
disregard

all

transmission

between

these

addition,

the

master

address

multiple

can

two.

006g (BELL) — Used to select all terminals to

receive simultaneously (broadcast mode). Until a

unique

code 002g has been received, the BELL code does

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

002g (STX) — Used to "lock” all terminals in their

In the address mode, terminals respond

selected or unselected mode and to prevent an

to character combinations that make up their broad-

unintentional selection during data transmission.

cast, unique, or group addresses.

No terminal begins to print until 002g is received.

data mode.

In the data mode,

2-16

0055

(ENQ)— Only

used

with

uniquely

Select (add-on)
To add other terminals to terminals already selected

selected slave terminals (has no effect on broadcast

and

uniquely

group
selected

Answerback

selected

slaves).

slave terminal

Option

(LAXX-KX)

When

has

without having to readdress all terminals, perform the

following:

an Auto

installed

and

receives a 0058, the stored answerback message

Issue 0038.

is sent back to the master terminal. This allows

Type new address or addresses.

verification

being

that

addressed.

the

correct slave terminal

The

answerback

message

Send message
— 004g at the end of a message.

transmitted after the EIA interface CLEAR TO
SEND signal goes high.

ACOUSTICAL COUPLER OPTION (LAXX-LM)

0045 (EOT) — Used to reset all terminals on

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

the line so that none are selected.

The master establishes the type of slave as follows:;

of the sending system and listen for the carrier sound
(loud'whistle). After receipt of carrier, place the handset

Broadcast

into the acoustical coupler muff assembly with the

Issue 0078‘

phone cord end of the handset inserted into the muff

Issue 0028‘

with the “dot” and/or word “CORD’ next to it. Within

Send message — All terminals receive 004g at

5 seconds, the carrier light illuminates. Normal system

the end of a message.

operation may now commence.

Group
Type group address.

NOTE

Issue 002g.

Send message —

all

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 prevents the disconnect noise from causing
printing of random characters.

Unique Select
Type unique address.
Issue 0%8*
Type any character.
Issue 002g.

Send

Addressed

message —

terminal

receives

0048 at the end of a message,

2-17

INSTALLATION AND CHECKOUT OF LA36 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 and secure with the six screws and

available.

associated washers previously removed.

Before

installing any option, it is recom-

mended that these diagrams be consulted to ensure

proper cabling.

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

EXPANDER OPTION MOUNTING KIT (LAXX-LB)

each hinge bracket.

The ,Exbander QOption Mawunting K\it‘ VcontainsV 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 |
1

Item

Part Number

“Option Distribution

| Board Assembly
1

D-CS-5411668-0-1
)

Right-Hand Side Rail

10.

D-MD-7414045-0-0

Assembly

Left-Hand Side Rail
Grommets

-2

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

D-MD-7414044-0-0

11.

Assembly

Insert the two screws (4) and tighten these screws
and screws (5).
|

9007017-00

Interconnecting Cables

| C-IA-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
end has the ribbed side of the cable facing up and

A nut driver, Phillips, and straight blade screwdrivers are
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
installation guides.

A connects to A at each cable end. Failure to

observe this polarity may cause a logic board

failure.

Unhook all cables from the logic board.

Remove the six screws and washers that secure the

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 +5
and GND terminals or the power board and the

logic board to the cabinet door and then remove

other cable end to the Faston terminals (7, Figure

the logic board.

Unplug the ac power cord.

34) on the option distribution board assembly.
Route the cable with existing cables to the power

Place the right and left side brackets (1, Figure

board.

34), over the screw studs as shown. The hinge tabs

of the side brackets (2) should be point inward

Test After Installation — Energize the DECwriter. In the

toward each other and toward the interior of the

on-line mode, data sent will produce printed characters.

cabinet.

2-18

~ NOT USED

TO J1 POWER BOARD

TO FRONT PANEL

20mA SERIAL INPUT

CONTROL BOARD
i

(IF USED)

EIA INPUT

Bl [
|

[

M7728 LOGIC BOARD

o
A. No options installed

TO J1 POWER BOARD —————

20mA SERIAL INPUT

(IF USED)

— EIA INPUT

(IF USED)

’

M7728 LOGIC BOARD

NOT

TO FRONT

USED

PANEL

‘JSI

BOARD

LJ_;_J ‘421 !41‘ ‘J4l
EXPANDER MOUNTING

OPTION

(LAXX-LB)

B. Any option and auto line feed or

auto answerback options nof installed

— EIA INPUT

TO Ji POWER BOARD

20mA SERIAL INPUT

(IF USED)

M7728 LOGIC BOARD

‘.33!

LJ_}J

TO FRONT

PANEL

CONTROL

BOARD

‘45!

NOT USED

‘J#‘
NOT USED
]

w[_a_jb_{jl_fl{_‘ifl
EXPANDER MOUNTING
(LAXX-LB)
0

C. Any option and auto line feed or,

auto answerback options installed

cP-2191

Figure 33 Cabling Configurations for Various LA35
Options

2-19

TO FRONT

_PANEL CONTROL
J2

DOOR (DECWRITER II)

REF

LOGIC

- BOARD (MPC)
CONN J5

CP-2104

Figure 34

Installation of Expander Mounting

(LAXX-LB)

2-20

Kit

APL OPTION KIT (LAXX-PK)

Test After Installation — Install paper and apply power.

The APL Option Kit contains the following:

characters when program selected.

Quantity

item

Part Number

FORMS CONTROL OPTION KIT (LAXX-KV)

APL/ASCII Dual Char-

D-CS-M7732-0-1

acter Set Board
1

the

B-UA-H851-0-0

APL ROM

23086A6

APL ROM

23087A6

Phillips Pan Head

9006011-1

Quantity
1

DECwriter

will

Item

APL

Part Number

Top-of-Form Control

X 0.38 in.)

D-AD-7011503-0-0

Assembly Board

Flat Washers (#4)

9006655

Lock Washers (#4)

9006688

Line Indicator

Top-of-Form Module

C-MD-7414953-0-0

Top-of-Form Cable

D-1A-7011516-0-0

Phillips Pan Head

9006011-1

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

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

~ required tools for installation.
Use Figure 35 and the
following procedure as installation guides.

NOTE

Unplug the DECwriter and remove paper.

installed,

install

D-CS-M7735-0-1

Board

;

already

the

Screws (#34—40

not

mode,

The Forms Control Option Kit contains the following:

Edge Connector

line

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

9006022-1

Edge Connector

B-UA-H851-0-0

Lock Washers (#4)

9006688

Lock Washers (#6)

9007801

Flat Washers (#4)

9006655

Flat Washers (#6)

9006653

the Expander

Option Mounting Kit (LAXX-LB).
A

Phillips screwdriver

is the only tool

required

for

Refer to Figure 33 for the correct interface cabling

installation. Use Figure 36 and the following procedure

required to integrate the APL Option into the

as installation guides.

existing options.

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

board in location F on the expander board (Figure

Unplug the ac power cord and open the top cover.

not

already

installed,

install

the Expander

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

for Pin No. 1 locations.

the

attaching

hardware

the

bell

speaker. Save the two #6 flat washers and two

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

Remove the cover from the DECwriter.

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

Remove the two front screws (5) and associated
washers from the

print head,

install

the

line

indicator

shown,

reassemble

the

(6)

and

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

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

removed hardware.

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

Replace the cover.

the inside as in (4).

screws, #6 flat and lock washers and secure from

2-21

Figure 35 Installation of the APL/ASCII Dual Character
Set Board
|

2-22

OPTION MOUNTING
(LAXX~ L8)

Cp-2106

Figure 36

Installation of Forms Control Option Kit

(LAXX-KV)

2-23

The

top-of-form

cable

has two distinct ends,

FORMS CONTROL, VERTICAL TABULATION,

differing by the length of the wire leads and type

AND HORIZONTAL TABULATION OPTION

of push-on connectors. The cable end with the

KIT (LAXX-KY)

longer leads and smaller connectors connects to

the top-of-form control assembly and the other

The Forms Control, Vertical Tabulation and Horizontal

end to the top-of-form control

Tabulation

module board.

Connect the two push-on leads to the terminals on

Option

Kit

contains

the

Forms Control

Option Kit (LAXX-KV) and the following:

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

8-pin connector as shown.

Quantity

Install the top-of-form control assembly using the

D-AD-7011503-0-0

washers as shown in (5). Screw in from the outside

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

of the bracket.

' Top
of Form Cable

Assembly

Phillips Pan Head

Feed the cable under the printer mechanism down

D-1A-7011516-0-0

1 9006011-1

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

through the access hole and, using the existing

Phillips Pan Head

cable clamps, conform the cable as shown.

Screws (#6-32 X 3/8 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

Edge Connector

BN
-

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

location “B”’) on the Expander Option Mounting

11.

Part Number

' Top-of-Form Control

previously removed #8-32 X 3/8-in. screw and #6

10.

item

| B-UA-H851-0-0

Lock Washers (No. 4)

9006688

Lock Washers (No. 6)

19007801

Flat Washers (No. 4)

9006655

Flat Washers (No. 6)

9006653

(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 for

shown.
12.

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
If

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

Refer to Figure 33 for the correct interface cabling

required to integrate the Forms Option into the

inches.

Press and

release the SET TOP OF

FORM pushbutton.

existing options.

Issue a Form Feed Command (014g). The paper
should feed and stop at a distance that is equal in

Unscrew

inches to the switch setting. Repeat this procedure

speaker. Save the two #6 flat washers and two

the

attaching

hardware

of the

bell

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

for two other switch settings, one longer, the other
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 pushbutton.
Feed command (012g)

Issue a Line

17 times, then

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

issue a

control assembly (1).

Form Feed command (014g). The paper should

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)

ends,

Set the FORM LENGTH switch to 3 and press the

differing by the length of the wire leads and the

The

top-of-form

cable

has

two

distinct

SET TOP OF FORM pushbutton. Issue Line Feed

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

(012g)

the longer leads and smaller connectors connects

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

to the top-of-form control assembly and the other

one line,

end to the HT-VT-TOF module board. Connect
the two

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 function, set the TOF for 11-in. form

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).

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 line feed 11 in,

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

Issue a “B" (102g).

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

Issue 012g 10 times, issue 0338 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
11.

connectors as shown.

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
—

procedure:

Perform

the

following

14.

Issue 015g, then issue 040g eight times.

15,

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

Load paper, energize
the DECwriter, and set the
FORM

LENGTH

16.

switch to correspond to the

length of the form in inches. Press and release the

SET TOP OF FORM pushbutton.
Issue

any character,

then

issue

17.

Form

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

a “B"” (102g).
Issue 040g eight times; issue 033g and 061g; issue
a

Feed

MCN

(1038)*

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 OF

18.

Issue 031g; issue 012g.

19.

Issue 011g; issue a “D” (104g).

20.

Issue 011g; issue an “E” (105g).

other

FORM

pushbutton after changing the setting.

2-26

21,

Issue 011g; issue a “F* (106g).

Install the two H851 edge connectors (2). Edge

connectors and board are keyed for proper fit.

22.

lIssue O11g; the head will move to column 132

23.

The printed characters will be in two lines with the

Test After Installation — Load paper and energize. With

top line one character space to the right of the

jumper W1 not cut out, a Carriage Return command

second line.

(015g) will generate a line feed. With W1 cut out, a
Carriage Return command will not produce a line feed.

Issue 031g; issue 011g twice, then issue 020g ten

24.

times.

SELECTIVE ADDRESSING OPTION KIT (LAXX-KW)

Issue 011g;issue a “G” (107g).

The

Selective

Addressing

Option

Kit

contains

the

following:

25.

Issue 011g; issue an “H" (108g). The characters

Gunmity

“G"” and ““H” will overprint on the previously
printed “E" and "F."”

26.

Item

Part Number

Selective Addressing Board |D-CS-M7737-0-1

Issue 033g and 062g; issue 031g; issue 011g. The

Edge Connector

B-UA-H851-0-0

print head will move to column 132. The test is

Phillips Pan Head Nylon

|9006401-04

Screws (#4-40 X 0.38 in.)

completed.

EIA Interface Cable

C-1A-7010489-0-0

AUTOMATIC LINE FEED OPTION KIT (LAXX-LA)
The Auto Line Feed Option Kit contains the following:
A Phillips screwdriver is the only tool required for

Quantity

item

Part Number

installation. Use Figure 39 and the following procedure

as installation guides.
1

Auto

Edge Connector

Line Feed Board | D-CS-M7738-0-1

B-UA-H851-0-0

Phillips Pan Head

9006011-1

Screws (#4-40 X 0,38 in.)

Lock Washers (#4)

9006688

Flat Washers (#4)

9006655

Unplug the ac power cord.

not

already

installed,

install

the

Expander

Option Mounting Kit (LAXX-LB).
3.

Refer to Figure 33 for the correct interface cabling
required

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

as installation guides.

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.

Unplug the ac power cord.

not

already

installed,

5.
install

the

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

Expander

Option Mounting Kit (LAXX-LB).
6.

If the Selective Addressing Option is to be used

Refer to Figure 33 for the correct interface cabling

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

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.

Selective Addressing board).
4.

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

0.38-in. screws and #4 washers), secure the Auto
Line Feed board

Test

After

Installation —

Perform

the

following

procedure:

in locations C and D on the

expander board. As shown, one of the mounting

holes should not be secured.

2-27

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

EXPANDER
OPTION MOUNTING
(LAXX-LB)

AUTO LINE FEED

NO sgfle:w |

BOARD

cpP-2108

Figure 38 Installation of Automatic Line Feed
Option Kit

(LAXX-LA)

2-28

EI1A OPTION

\
4

SELECTIVE

ADDRESSING
BOARD

"¥)\

(LAXX-LG)

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

12.

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

any other type 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"

15.

Typing on B causes A to print.

and the terminal without the option designated
“pg
v

AUTOMATIC ANSWERBACK OPTION KIT

(LAXX-KX)

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

The

Auto

Answerback

Option

Kit

contains

the

following:

Transmit from terminal 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

B-UA-H851-0-0

Phillips Pan Head

' 900601 1-1

Screw (#4-40 X 0.38 in.)

Transmit from B; terminal A does not receive.

Lock Washers (#4)

9006688

Flat Washers (#4)

9006655

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

A Phillips screwdriver is the only tool

On terminal B, type the group select code that was

as installation guides.

entered into the switches on the Selective Addressing circuit board installed in terminal A.

On terminal B, type CTRL B. Terminal A can

not

already

installed,

install

the

Expander

Refer to Figure 33 for the correct interface cabling

On terminal B, type CTRL D.

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) (four #4-40 X

selected slave.

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
was entered

Unplug the ac power cord.

Option Mounting Kit (LAXX-LB).

receive from B.

10.

required for

installation. Use Figure 40 and the following procedure

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.

On terminal B, type CTRL B. Terminal A can
receive.

Enter the answerback message using the 7 slide

switches on the 20 character switches. Use the
NOTE

Steps

12 through

standard ASCII code. The ON switch position is

15 set 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

AUTOMATIC

ANSWERBACK
BOARD

CP-210

Figure
40

Installation of Automatic Answerback

Option Kit (LAXX-Y)

2-31

Test After Installation — A received ENQ command

(0058) will generate the answerback message.

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

EIA INTERFACE OPTION KIT (LAXX-LG)

Switch to Local Mode
Power-up Sequence Not Completed

The EIA Interface Option Kit contains the following:

Terminal Power Switched Off

Quantity

Item

Part Number

The

status

these

jumpers produce the

following

outputs for any of the above conditions.

EIA Interface Assembly
Phillips Pan Head

| D-1A-7011828-0-0
9006037-1

Screws (#8-32 X 0.38 in.)
2

Lock Washers (#8)

9006690-00

Out

Flat Washers (#8)

9006660-00

Out

EIA Output Signal

Out

None

230 ms BREAK on Transmit
Data Line

A Phillips screwdriver is the only tool

required for

Out

DATA TERMINAL READY

installation. Use Figure 41 and the following procedure

- Disconnect

as installation guides.

NOTE
The EIA board is shipped with both jumpers installed.

Unplug the ac power cord.

Disconnect the 20 mA interface input cable from

The

J3 on the M7728 logic board.

TERMINAL READY disconnect regardless of jumper

NOTE

CARRIER

DETECT signal can cause a DATA

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)

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).

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

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

board.
7.

Connect the input end of the EIA cable assembly
to the signal source.

The

Compressed‘ Font Option

Quantity

selection of the type of BREAK and DATA TERMINAL

READY signals that are output by the EIA interface.

Item

Part Number

30-Tooth Timing Pulley | 1212446-00

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

Pulley Clamp

Timing Belt

Socket Head Cap Screw | 9006350-8

C-MD-7414951-0-0
1211583-02

(#10-32x 1in.)
1

|
The EIA circuit board has two wire jumpers that allow

Kit contains the

following:

Hex Socket Set Screw

9007722-10

(#1/4-20)

Kep Nuts

Right-Hand Spacer

9006565-00
C-MD-7415010-0-0

Channel Strip

9007036-00

The following tools are required for installation: socket

Using a socket head wrench, loosen the set screw

head wrenches, Phillips screwdriver, feeler gauges, and a

in the pulley clamp (5) until the existing timing

torque-type Phillips screwdriver. Use Figures 42 and 43

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

and the following procedure as installation guides.

Remove ac power from the

This pulley clamp can be discarded.

DECwriter and remove

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

the top plastic housing.

then remove and save this pulley.

Remove the ribbon from the print head area.

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

Aswmble the cap head screw and Kep nuts, then

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

insert through the left side bracket as shown in

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

©).

Figum 41

Installation of EIA Interface Option Kit

(LAXX-LG)

2-33

CP-2111

CP-2113

Figure 42

Installation of Compressed Font Option Kit

(LAXX-KJ)

2-34

6-32 SCREWS TO

BE TIGHTENED 10+ 2

0.012

IN./LBS. OF TORQUE

FEELER GAUGE

PRINT HEAD

PRINT BAR

o
p

.,
L

.a
o

.
o

E{fi%«

3 e

L
el

‘

.
-

o
e

.
e .
iy

“‘%.‘,

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 43

Print Head Adjustment

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

Install the new 30-tooth timing pulley on the

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

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.

do not tighten the four mounting screws.

10.

Set the Carriage Adjustment lever to the minimum
gap position {(detent closest to the print bar).

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

Install the new 15-tooth pulley on the motor shaft

and secure, using the new pulley clamp provided.
9.

Remove the four screws (7) that secure the print

It is possible to position the Carriage Adjustment

lever beyond the minimum gap position. If this is
done, the correct head gap adjustment cannot be

made.

CP-2118

Figure 44

Installation of 20 mA Cable O ption Kit

(LAXX-LH)

2-36

11.

Adjust the print head gap with the carriage in the

20 mA CABLE OPTION KIT (LAXX-LH)

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).

The 20 mA Cable Option Kit contains the following:

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

- Quantity

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,

Cable

BCO5F-15

Cover Plate

C-MD-7413216-0-0

Phillips Pan Head Screw | 9006037-1

#8-32 x 0.38 in.)
2

- Flat Washers (#8)
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

damaged.

14.

up through the access hole

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

16.

17.

the floor and

connect it to J3 on the M7728 logic board.

Secure the cover plate (3) using the two pan head

and print bar.

screws and associated washers (2). Position the

Recheck the gap at the center. The gap should be

cable (1) as shown.

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

Connect the

through 14 again.
15.

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.

Part Number

resulting in more than 0.012-in. of clearance.
12.

Item

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 housi‘ng

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
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
turn.

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

input end of the 20 mA cable

assembly to the signal source.

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

20 mA (DEC 10) CABLE OPTION KIT (LAXX-LK)
The 20 mA Cable Option Kit contains the following:
Quantity

Item

Part Number

Cable (2838 Connector to | D-A1-7009212-1-0

Cover Plate

Phillips Pan Head Screws | 9006037-1

Mate-N-Lok Connector)

C-MD-7413216-0-0

(#8-32 X 0.38 in.)
2

Flat Washers (#8)

9006660

Lock Washers (#8)

9006634

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

A Phillips screwdriver is the only tool

functions are unaffected.

as installation guides.

required for

installation. Use Figure 45 and the following procedure

cpP-2118

Figure 45

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

2-38

Disconnect and remove any previously connected

data input line.

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

Before installing the pointer, these two parts must
be separated at this web. Fold the spacer down
under the pointer to break apart.

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

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

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.

NOTE

If after installing the print window, the green and
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

assembly to the signal source.

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

pointer.

SCALE,

POINTER,

AND WINDOW OPTION KIT

(LAXX-LN)

The Scale, Pointer, and Window Option Kit contains the

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
backing and position on the cover.

following items:

Column Scale

C-1A-7414986-0-0

The column scale (5) adheres to the lip on the
print window (6) as shown in Figure 46. Insert A
of Figure 46 details the placement of the scale on

Line Indicator

C-MD-7414953-0-0

the window lip.

Column Pointer

C-MD-7415409-0-0

Print Window
1212009-00
Light Shield
C-MD-7415255-0-0
Phillips Pan Head Screw | 9006011-1

Quantity

1
1
1
1

item

Part Number

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

9008172

Lock Washer (#4)

9006632

The print window (6) snaps into place in the top
“cover opening.

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
- 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.

NOTE

After installing the column scale (5) and the

Unplug the ac power cord, remove the paper, and
remove the top cover.

column pointer (2), a horizontal adjustment may

Install

column pointer should align with a corresponding

be required. The green indicator line on the

the line indicator on the print head
assembly using the two front Phillips screws.
Remove

the

screws,

insert

the

line

line on the column scale before the last character

visibility (LCV) move takes place. If alignment is

indicator

performed after the last character visibility move,
the red line on the column pointer is used.

beneath the ribbon (do not interfere with the
ribbon's path), then secure with the screws.

2-39

COLUMN |
SCALE POSITIONING

|
1

LEFT-HAND
EDGE

__PROPER

o~ ALIGNMENT
NNNNN

NE
"

;

INDICATOR

CP-2117

Figure 46

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

2-40

—

DF11 ADAPTOR KIT (LAXX-KH)

Unplug the ac power cord and remove the existing
|

top cover.

The DF11 Adaptor Kit contains the following:

Item

Quantity

Part Number

Remove the Paper Advance knob (2, Figure 48) by
unscrewing the #6 screw (1, Figure 48) from the
center of the knob.

1
1
1
2

C-MD-7413104-0-0
Adaptor Bracket
B-1A-7010599-0-0
Assembly
Wired
Cable Assembly
|
C-1A-7010598-0-0
Phillips Pan Head Screws | 9006001-01
(#2-56 X 1/4 in.)

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.

Phillips Pan Head Screw | 9006023-01
(#6-32 x 7/16 in.)

NOTE

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

A Phillips screwdriver is the only tool required for

installation. Use Figure 47 and the following procedure
as installation guides.

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

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

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

Attach the wired assembly (2) to the bracket with

a #6-32 screw (3).

access hole as shown in Figure 49.

The cable assembly (4) should be soldered to the
wired assembly as in Figure 47.

on the logic board.

Connect the cable end into the EIA connector (J4)

Test

Connect the cable connector to J4 on the logic

After

board.

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

Installation—

Perform

the

following

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

small screws supplied (#2-56). The screws insert

muff assembly.

through the hollow rivets in the DEC-CHIP handle

and secure into the adaptor bracket at (5).
Test

After

Installation—

Refer

the

NOTE

checkout

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

procedures for the DF
11 module installed.

ACOUSTICAL COUPLER OPTION KIT (LAXX-LM)

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

The Acoustical Coupler Option Kit contains a new cover

(D-AD-7012144-0-0)

that replaces the existing LA35

cover and a rubber 0" ring (9009793-00) that fits over
the tractor drive shaft to minimize mechanical noise

NOTE

generation during a paper advance. A Phillips screwdriver

Prior to removing the telephone handset from the

is the only tool required for installation. Use Figures 48

muff assembly, place the DECwriter in the local

and 49

guides.

mode. This action prevents the disconnect noise

plus the following procedure as installation

from causing printing of random characters.

2-41

M.,-wwmmmm%

MMW«%» » »

6-32

_—~ SCREW

[

Q<1 ——— 842 (ReD) 45V
e

BB2 (BLUE)-12V

——BD1 (VIOLET) RCVD

BN2 (GREEN) +12V

BT1 (BLACK) GND

BV2 (YELLOW) XMTR

DATA TTL

|
CP-2118

Figuré 47 Installation of DF11 Adaptor Mbunting Kit
(LAXX-KH)

2-42

CcP-2184

Figure 48

Installation of O’ Ring on Tractor
Drive Shaft

CARRIER INDICATOR

cp-2190

Figure 49

Installation of Acoustical Coupler Option Kit

(LAXX-LM)

2-43

SECTION 3

COMMON INFORMATION

LOADING PAPER AND CHANGING THE RIBBO
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:

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

Paper Positioning

impression Adjustment

performed, reloading paper becomes quick and simple,
requiring a minimum of interruption.

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.

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

ove the Carriage

Adjustment lever to the highest

number (toward operator).

‘

L
e

CARRIAGE

ADJUSTMENT
LEVER

s
i

7666-16

Feed the paper through the load channel under the

terminal and align the mfl; paper margin holes over
the left tractor pins.

Close the left tractor cover.

Loosen the Tractor Adjustment knob on the right

tractor about 1/2 turn.
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 ag

tractor pins or bow in the middle.

Tighten the tractor adjustment, and proceed to the
impression adjustment.
Ha

PRESSION Al

o
i

ENT

OTE
The

rriage Adjustment lever is normally set

forward (to notch number 1) for single thickness
paper. The following procedure

icable only

to multipart forms.

Set the POWER switch to OFF.
v

corresponding to the number of parts in the form.

Set the Carriage Adjustment lever to the number

Turn the Paper Advance knob counterclockwise
while moving the Carriage Adjustment lever for-

ward one notch at a time until the paper smudges;

FEBE-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

rt copy is poor but the remaining
o

The horizontal positioning adjustment enables the paper
to be shifted left or right [1/2 in. (1.27 cm) max.].

ol
i

Shifting the paper provides a simple means of aligning
the type within the appropriate columns on the paper.
Set the POWER switch to OFF.
w
. 0

Move the tractors the desired amount

Lift the cover and loosen both Tractor Adjustment
knobs about 1/2 turn.

(1/2 in.

max.) to have characters type in the appropriate

columns.

T M

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

KNOB

ADVANCE

7595-4

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.

OTE
Ensure

that

the

leading edge

of the forms

—

RELOADI G PAPER

]

directly below and parallel to the feed siot.

Wfi

@%v,j

L
@“,&@
eo
i

. .

Feed the paper through the load channel under the
terminal and align the paper holes over the tractor
i

pins,

i
0
b

1
.

%ég%@?f}%
.
U
i

Close the tractor covers.

.
. ”’ .
.TL

G
o

3-6

RIBBON INSTALLATION

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

After 12 hours, or when the print density becomes too light, remove both ribbon spools from their drive spindles and
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

warranty.

Set the POWER switch to OFF and lift the cover.

Record the setting of the Carriage Adjust lever.
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.

machine

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

turns of ribbon on the empty spool.

\w‘wi%‘»

. L ‘/‘%fiv

CARRIAGE LEVER ADJUSTMENT

cp-2008

Place the full spool on the left spindle and turn

Take up the slack in the ribbon by turning the free

clockwise until it drops into position.

moving spool.

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

Return the Carriage Adjust lever to its original
setting.

through E.

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

NOTE

The rivet located on the ribbon must be on the

Guide the ribbon through slot J (directior

spool or between the spool and the Direction

changing guide) and around idler spool K.

Changing guide.

Ribbon can be threaded in the opposite direction
(from K to A).

Turn the spool clockwise until it drops into
position.

DECwriter INTERFACE INFORMATION

INTERFACE DESCRIPTION

’

;
|

There are three interface option kits available for the

START~LSB

I‘A‘w

[.t

MSB

{

NS N

'“}l""'""‘"""‘\

T T

BITS

TTM

STOP

}

bbby

TrrTr

PARITY

DATA

BIT ['

DECwriters:

LAXX-LH, 20 mA Cable Option Kit (Figure 50)

the LA35 utilizes only the receive circuitry.

The LA35 and LA36 have identical interfaces. However,

{00ms

NOTE

r110 BAUD

| B

FhQ.OQms

LAXX-LK, 20 mA Cable Option Kit DEC-10 (Fig-

ure 51)

{a..-.:
*

LAXX-KG or LG, EIA

Interface Option Kit (Fig-

66.6ms

:;:

ure 52)

INTERFACE SPECIFICATIONS
The interface specifications for the DECwriter serial 20
mA current loop are shown below:

X
START

BIT ]'LS

8
DATA

BITS

Transmitter (LA36 only)

Passive, isolated, goes to Mark state when power is

PARITY,

SB]

1,
STOP

BIT

>150 BAUD

TTTTTTT
ERER
ERERET
R

—o{

33.3 ms

:;%

l-—s.esm

turned off.

Open circuit voltage

Min.

Max.

5.0V

40V

{::
|

(of circuit being driven)
Voltage drop, Marking

05V

20V

Spacing current

0.4 mA

2.0 mA

Marking current

20 mA

80 mA

{

START

BIT

[’

LSB

DATA

MSB

BITS

I"k“\r '

[. {

pARITYq

Passive, isolated

Min.

{

}

“‘H"‘L‘\

T T

> 300 BAUD

STOP

BIT

’

T rTTTrTT

Receiver

{

}

cparm

Max.

Voltage drop, Marking

1.2V

2.7V

Spacing current

0.0 mA

3.0 mA

Marking current

15 mA

80 mA

Serial Interface Timing Diagram

Cable

Receiver/Transmitter (LA36 only)
Active, half-duplex

4-conductor LAXX-LH or LAXX-LK

(Cable extension up to 1500 ft is permitted)

3-10

Min.

Max.
4.7V

Voltage drop, Marking

1.7V

Spacing current

0.0 mA

3.0 mA

Marking current

15 mA

80 mA

PINNING

STRAIN

FROM

P1-2

P2-3

cP-2043

Figure 50

DECwriter 20 mA Current

Loop Cable Connection

3-11

283B CONNECTOR

( TELEPHONE

CONNECTOR)

CP-2042

Figure 51

DECwriter DEC10 20 mA

Current Loop Cable Connection

STANDARD EIA MODEM - TERMINAL INTERFACE CONNECTIONS
SENTTO

DATA TERMINAL

NAME

RTS

’

EIA CIRCUIT

DESIGNATION

FUNCTION
FRAME GROUND

RECEIVED DATA

TRANSMITTED DATA
REQUEST TO SEND (NOTE 1)

DATA CARRIER DETECT (NOTE 2)

SIGNAL GROUND

NONE

UNASSIGNED

NONE

RING INDICATOR (NOTE 2)

DCD

DTR

DATA TERMINAL READY (NOTE 1)

EQUIPMENT

{DECwriter)

DATA

COMMUNICATIONS

EQUIPMENT
X
X

X
X

NOTES:

1.
2
3.
4.

REQUEST TO SEND AND DATA TERMINAL READY ALWAYS ASSERTED ON LAXX-KG.
DATA CARRIER DETECT AND RING INDICATOR NOT USED ON LAXX-KG.
POSITIVE VOLTAGE EQUALS BINARY ZERO, SPACE, ON.
NEGATIVE VOLTAGE EQUALS BINARY ONE, MARK, OFF.

&%{WMMWM 8-1)
AAMTT22, MTT23,M7728)

USERS

EQUIPMENT
CP-2046

Figure 52

DECwriter EIA

Logic Board Connection

PROGRAMMER’'S GUIDE
LA36 PROGRAMMER'S INFORMATION
NOTE

All information in this section is applicable to the LA35,

]

HEAD

BUFFER

RECEIVER

INCOMING
TA

with the exception of keyboard operations. This is due
to the fact that the LA36 and LA35 receive operations

and baud rates are identical.

;

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

SRR

KEYBOARD

LA36

SPECIAL COMMAND KEYS

CP-1166

‘Normally, the DECwriter prints characters and processes
commands

CTRL Key

fast

they

are

received. The one

exception is the RETURN operation (moving the print

Holding down the CTRL key changes the ASCII code
transmitted when another key is typed in that it forces

head back to the left margin). RETURN can take longer
than

bits 6 and 7 to 0. For example, the ASCII code for the

the

inputs.

letter ““g” is 147 (1100111)
%

]

T T T e— NN N A

each key is transmitted the instant a key is depressed.

OUTGOING
DATA

TRANSMITTER

time interval

This

between two successive data

normal

condition

for

mechanical

devices, which are slower than electronic signals. The
normal programming practice is to compensate for this

bits 6 and 7

time lag by using filler characters (such as ASCII 000) to

take up slack time.

Holding down the CTRL key and typing the “‘G’’ key
transmits the ASCII code 007 (9?1 11)

In the LA35 and LA36, it is necessary that a single

nonprinting,

nonspacing character be sent after a
carriage return or that carriage return is followed by

bits
6 and 7 are forced to 0

33.33 ms of idle (marking) line time.

The CTRL key enables thé"LABG operator to transmit

all ASCII control codes (000—-037).

The nonprinting, Vnonspac:ing character requirement is
fulfilled by the line feed, (LF) code which normally will

BREAK Key

follow CR. The LF function will be executed simulta-

‘The BREAK keyvls cammmnw umd 1o manually

neously with CR.

interruptthe flaw of data comingto the LA36. The

‘function of the BREAK k&v is to cause the transmitted

data signal from ‘the LA36to go to;lfl spacecmmdwtmn;

~ Additional CR characters sent without an intervening
~

character that cwses printing or spacing will be dis-

while the BREAK key isdepressed. If the LAXX-LG

mgardad

EIA/CCITT interfaceis installed, then the EREAK mgnalyf ;

The fmllawmg table lists the 7-bit ASCII codes used by

is limited to apprommam!y 230 ms.

RECEIVING CHARACTE ns AN,T’?’L cm

the DECwriter and indicates the operations performed

f:ems

The DECwriter receives commmd&%as w&li as0haramem
to

printed

the

form

7-bit

ASCII

codes.

by the printer. Note that some ASCII codes, though

~ generated by the keyboard, are not recognized by the
printer.

3-14

ETX

004

EOT

005

ENQ

006

ACK

BEL

007
010

011

012

014
015

017

020

DLE

021

DCI

022

DC2
DC3

023
024

DCA

025

NAK

026

SYN

027

ETB

030

CAN

031

032

SUB

033

034
035

ESC

036

- 037

040

Printed

~Action/Description

None

miololw|>

003

|
|/

BELL

H
|
J

None

Sound Alarm Bell

Backspace one position
”

None
Advance Paper one line

<
-

STX

CHAR

None

mn
-

002

RECEIVE OPERATIONS
Character |

None

Move print head to left margin

~|l—INl<|x|=sl<|c|l4|v|x|lo]|v|lo|lz2]|=

~ SOH

CTRL*

SN EN RN LN RN ES RN RN ES RN RN AN RN RN BN AN RN AN AN AN AN ENES N AN ENEN AN RN N

001

< |«

SHIFT* |

NUL

000

Chamcwr

ASCII Code

KEYBOARD OPERATIONS
To Transmit, Type Key(s)

None

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.

3-15

KEYBOARD OPERATIONS

ASCII Code

Character

RECEIVE OPERATIONS

To Transmit, Type Keyl(s)

Character

SHIFT* | CTRL* | CHAR

Printed

|
Action/Description

041

Print character, move print head

042

one position to the right.

043

#
%

044

045

046

047

050

(

051

)

052

053

054

055

056

)

057

060

061
062

1
2

063

064

066

€

067

6
7

070

071

065

072

’

;

—~

073

;

074

075

076

077

100

101

103

104

RV,

Print character, move print head

one position to the right.

L
,

’
v

*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.

3-16

ASCliCode
105
106

i
¢

Character
E
F

KEYBOARD OPERATIONS

To Transmit, Type Key(s)

I_ ~ Printed
.
E

SHIFT* | CTRL* | CHAR
Vv
E
\/

RECEIVE OPERATIONS
Character

one position to the right.

107

110

111

112

113

114

115

116

117

120

121

-Q

122

123

124

125

126

\Y;

127

130

131

132

133

[

134

135

]

136

137

140

‘

141

142

143

144

145

]

146

147

150

Action/Description
Print character, move print head

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.

KEYBOARD OPERATIONS

152

163

1565

156
167

160

161

163

164

162

~|lalvlo|s|3

154

165

166
167

170
171

172

L4
<

173

174
175

176
177

DEL

CHAR

Character

Printed

Action/Description

one position to the right.

Print character, move print head

[

alo|o|s]|3

CTRL*

-y

SHIFT*

151

Character

L |=-|--|"|N|<|X|=s|<|c|-H|»|D|o|v9|o|2|2|r|x|~
|-

ASCII Code

RECEIVE OPERATIONS

To Transmit, Type Key(s)

Y
z

\
l

\
f
Pt

Frint character, move print head

one position to the right.

DELETE

None

*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.

3-18

None

OPERATOR CARE, PACKING, AND REPACKING

OPERATOR CARE
1.

not

oil

UNPACKING AND INSPECTION
the

DECwriter.

Moving

parts

The following procedure outlines the steps required for

are

prelubricated and sealed by DIGITAL.

unpacking and inspecting the DECwriter.

Keep the cover closed whenever power is applied.

Cut the nylon retaining straps from around the
shipping carton and discard them.

Use only a lint-free cloth when cleaning the cover

and the keyboard. Do not use solvents or harsh

Remove the full telescope cap and then remove

cleaning agents to clean the DECwriter. If ex-

the stitched tube.

cessively dirty, a mild detergent solution or
desktop cleaner may be used sparingly.

Remove all shock-absorbing material and packing

from around the DECwriter (Figure 53).
Do not use any DECwriter surface area to hold
pencils,

paper

clips,

staples,

etc.

If an

object

accidently falls into the machine, turn the POWER

Remove the poly bag from the printer.

switch to OFF, unplug the power cord from the
wall outlet, and carefully remove the object.
Remove the foam

Tear paper only along perforations. Support paper

key protector pad from the

keyboard.

on the DECwriter cover when tearing to avoid

distorting the tractor-feed holes in the paper still
Loosen and remove the hex head bolt securing the

in the machine.

wooden leg brace to the skid assembly. Remove
If unexpected trouble arises, refer to the Trouble-

microfoam

shooting Guide in this section.

DECwriter.

3-19

from

around

each

leg

the

STRAPPING

FULL
TELESCOPE
CAP

c——

——

STITCHED

TUBE

———o

POLYBAG
—nu

WOOD BRACE

HEX HEAD BOLTS

TERMINAL

MICROFOAM

WOOD SKID

POLYBAG

TEE NUTS

CP- 2187

Figure 53

DECwriter Packaging

3-20

—

TIE

TERS-T

Figure 54

Carefully inspect the DECwriter cabinet, key-

Cable Tie Location

12.

board, and carriage assembly for possible shipping

Connect the interface cable to the user’s equip-

ment. {See the DECwriter Interface Information.)

damage. Inspect and check the enclosed packing

list for lost or missing items. Report any damage
or missing items to the local DIGITAL Field
Service or Sales Office and to the local carrier.

OTE
Site plans are not supplied by Digital Equipment
Corporation. Interface logic connections must be
specified

Remove the printer from the wooden shipping

ifferent.

skid and place it in the desired location.
i

10.

and provided by the system supplier, or

the customer, because each installation may be

Lift the DECwriter top cover assembly; clip and
remove the nylon cable tie securing the print head
assembly (Figure 54). Remove the caution tag.

PAC
If it becomes necessary to ship your DECwriter to
another location, repack it per the following procedure.

Install

and

adjust

the

leveling

feet

on the

Remove the ribbon and paper.

DECwriter legs.
2.

Using a nylon cable tie, secure the print head
assembly to prevent movement while in transit.

If necessary, wipe all outer surfaces with a clean,
soft,‘ lint-free cloth.

Pack the DECwriter as shown in Figure 53.
i

TROUBLESHOOTING GUIDE
Symptom
DECwriter does not turn on

when POWER switch is set to |

Possible Cause and Corrective Action

| AC’pmwer cord is not plugged into wall outlet — plug
itin.

ON.

Current is not coming from wall outlet — check
outlet with a known working electrical device (such

as a lamp).
Check AC Line fuse (Figure 55).
If none of the above, contact your local Field Service

Office.

Check servo fuse — might be blown (Figure 55).

Print head does not print
characters.

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

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

Print head is exerting pressure on paper so that paper

forms

tears when it advances — check print head position

control. (Adjust Carriage Adjustment lever.)
Tension

incorrect.
Line bunching

Tension
excessive.

3-22

exerted on the paper by the tractors is

|
exerted on the paper by the tractors

FUSE RATING
115V.

3A SB

230V.

15A SB

Figure 55

Fuse Locations

3-23

SERVO FUSE

INSTALLATION

d Field Service

5 usually three

lOn On services
I Service

nal %MW es

Product Repair Centers (PRCs)- You may send or bring equipment toa PRC for repair or replacement 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 wit

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 |l modules on
a fixed price basis. Turmn-

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|l modules and m 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 mwwm support to our customers performing any level of

DECWRITER |l maintenance. Available through this group is
b
®

Spare parts, spares kits, tools, and test equipment
Recommended
¢

5 listings developed specifically for your need and equipment. This service is

at no charge,

Maintenance documentation

Emergency parts
service,
!

Training: Educational 5ervices offers hardware maintenance courses for your

DECWRITER 1l Available at 14

worldwide training centers and at the customer site,

LOCATIONS OF PRODUCT REPAIR CENTERS:
North America:
,

Europe:

Chicago
Maynard
Ottawa

Belgium
France
Holland

UK
Sweden
Switzerland

italy

West Germany

Princeton
Santa Ana
Sunnyvale

General International Area:
Australia

Japan

| wm %mm MASS.

w reet

EW assachusetts 01754
or Services Marketing
=

DECWRITER 11 Installation Card

Reader’s Comments
LA36/LA35 USER’S GUIDE
EK-LA3635-0P-003

Your comments and suggestions will help us in our continuous effort to improve the quality and usefulness of
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PERMITNO.33

MAYNARD, MASS.
BUSINESS REPLY MAIL

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Postage will be paid by:

7
g,

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Technical Documentation Department

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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
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Richmond ¢« WASHINGTON, Bellevue ¢« WISCONSIN, Milwaukee (Brookfield) « INTERNATIONAL —ARGENTINA,
Buenos Aires

¢ AUSTRALIA, Adelaide, Brisbane, Canberra, Melbourne, Perth and Sydney ¢ AUSTRIA, Vienna «
BELGIUM, Brussels « BOLIVIA, La Paz ¢« BRAZIL, Rio de Janeiro and Sao Paulo « CANADA, Calgary, Edmonton,
Halifax, London, Montreal, Ottawa, Toronto, Vancouver and Winnipeg ¢ CHILE, Santiago * DENMARK, Copenhagen
« FINLAND, Helsinki « FRANCE, Grenoble and Paris * GERMANY, Berlin, Cologne, Frankfurt, Hamburg, Hannover,
Munich and Stuttgart « HONG KONG e« INDIA, Bombay ¢ INDONESIA, Djakarta ¢ IRELAND, Dublin ¢ ITALY,
Milan and Turin ¢ JAPAN, Osaka and Tokyo ¢ MALAYSIA, Kuala Lumpur ¢ MEXICO, Mexico City « NETHERLANDS, Utrecht « NEW ZEALAND, Auckland ¢ NORWAY, Oslo ¢ PUERTO RICO, Santurce ¢ SINGAPORE ¢
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Printed in U.S.A.