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XX-911F7-C8

February 1976

134 pages

Original

13MB

Document:	EK-LA3635-OP-002 LA36 LA35 DECwriter II Users Manual 197602
Order Number:	XX-911F7-C8
Revision:
Pages:	134
Original Filename:	http://bitsavers.org/pdf/dec/terminal/la36/EK-LA3635-OP-002_LA36_LA35_DECwriter_II_Users_Manual_197602.pdf

OCR Text

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

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-LA3635-0P-002

The following are trademarks of Digital Equipment
Corporation, Maynard, Massachusetts:
FLIP CHIP
UNIBUS
PDP
DECUS
DEC

DECtape
DECsystem-10
DECmagtape
DIGITAL

DECWRITER II

TABLE OF CONTENTS
Page
SECTION 1

LA36 USER'S INFORMATION

LA36 GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . _ . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
LA36 DECwriter Model Variations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
LA36 Jumper Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
LA36 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
LA36 OPERATOR'S GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
LA36 Operator Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Using the LA36 . . . . . . . . . . . . . _ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
LA36 INSTALLATION AND CHECKOUT GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
General Installation Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Unpacking and Repacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Checkout and Acceptance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
CONTROLS AND INDICATORS FOR LA36 OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . _ . . . . . . . 1-14
Forms Control Option (LAXX-KV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Forms Control, Vertical Tabulation, and Horizontal Tabulation Option (LAXX-KY) . . . . . . . . . . . . 1-14
Scale, Pointer, and Window Option (LAXX-LN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Acoustical Coupler Option ( LAXX-LM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
SETUP AND OPERATING PROCEDURES FOR LA36 OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
APL Option (LAXX-PK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Forms Control Option ( LAXX-KV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Forms Control, Vertical Tabulation, and Horizontal Tabulation Option (LAXX-KY) . . . . . . . . . . . . 1-17
Automatic Line Feed Option ( LAXX-LA) . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
Automatic Answerback Option ( LAXX-KX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

iii

TABLE OF CONTENTS (Continued)

Page
Selective Addressing Option ( LAXX-KW) . . . . _ . . . . . . . . . . . . . . . . . . .
. . 1-19
Acoustical Coupler Option ( LAXX-LM) . . . . . _ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
INSTALLATION AND CHECKOUT OF LA36 OPTION KITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . 1-25
Expander Option Mounting Kit (LAXX-LB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
APL Option Kit (LAXX-PK) . . . . . . . . . . . . _ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
Forms Control Option Kit ( LAXX-KV) . . . . . _ . . . . . . . . . . . . . . . .
. . . . . . . . .
. 1-32
Forms Control, Vertical Tabulation, and Horizontal Tabulation,
Option Kit ( LAXX-KY) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 1-34
Automatic Line Feed Option Kit ( LAXX-LA) . . . . .
. ...... .
. . . . . . . . . . . . . 1-36
Selective Addressing Option Kit ( LAXX-KW) . . . . . . . . . . . . . . .
. . . . . . . 1-37
Automatic Answerback Option Kit (LAXX-KX) _ . . . . . . . . . . . .
. . . . . . . 1-40
EIA Interface Option Kit (LAXX-LG) . . . . . . . . . . . . . . . . . . .
. . . . . . . 1-42
14-Key Numeric Pad Option Kit (LAXX-KE) . . . . .
. ...... .
. . . . . . . 1-42
Compressed Font Option Kit ( LAXX-KJ) . . . . . . .
. ..... .
. . . . . . . . . . . . . 1-44
Paper Out Option Kit ( LAXX-KZ) . . . . . . . .
. .... .
. . . . . . . . . . . . . 1-46
20 mA Cable Option Kit ( LAXX-LH) . . . . . . . .
. .... .
. 1-49
20 mA (DEC 10) Cable Option Kit (LAXX-LK)
. 1-49
Scale, Pointer, and Window Option Kit (LAXX-LN)
. 1-52
DF11 Adaptor Kit (LAXX-KH) . . . . . . . .
. 1-54
Acoustical Coupler Option Kit (LAXX-LM) .
. 1-54

SECTION 2

LA35 USER'S INFORMATION

LA35 GENERAL INFORMATION . . . . .
2-1
Introduction . . . . . . . . . . . . . . .
2-1
Options . . . . . . . . . . . . . . . . . .
2-1
2-2
LA35 DECwriter Model Variations ..
2-2
LA35 Jumper Configurations
LA35 Specifications . . . . . . . . . . . .
. . . . . . .
. . . . . . .
. . . . . . . .
2-3
LA35 OPERATOR'S GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
LA35 Operator Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2-6
Using the LA35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. ....... .
2-7
LA35 INSTALLATION AND CHECKOUT GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-7
General Installation Information .. .
2-7
Unpacking and Repacking . . . . . . . . . . . . .
2-7
Checkout and Acceptance Procedures . . . . . .
2-9
CONTROLS AND INDICATORS FOR LA35 OPTIONS
Forms Control Option ( LAXX-KV) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . .
2-9
Forms Control, Vertical Tabulation, and Horizontal Tabulation Option ( LAXX-KY) .
. . . . . . . .
2-9
Scale, Pointer, and Window Option (LAXX-LN) . . . . . . . . . . . . . . . . . . . .
. . · . · · · ·
2-9
Acoustical Coupler Option ( LAXX-LM) . . . . . . . . . . . . . . . . . . . .
. . . . . . . .
2-9
SETUP AND OPERATING PROCEDURES FOR LA35 OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . · · 2-10
APL Option ( LAXX-PK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Forms Control Option (LAXX-KV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 2-10
Forms Control, Vertical Tabulation, and Horizontal Tabulation Option ( LAXX-KY) . . . . . . . . . · · · 2-10

TABLE OF CONTENTS (Continued)

Page
Automatic Line Feed Option ( LAXX-LA) . . . . .
. . 2-12
Automatic Answerback Option (LAXX-KX)
. 2-13
Selective Addressing Option (LAXX-KW) . . . . .
. 2-13
Acoustical Coupler Option ( LAXX-LM) . . . . . . . . . . . . . . .
. 2-17
INSTALLATION AND CHECKOUT OF LA35 OPTION KITS . . . . .
. 2-18
Introduction . . . . . . . . . . . . . . . . . . . . . .
. 2-18
Expander Option Mounting Kit ( LAXX-LB) ... .
. 2-18
APL Option Kit (LAXX-PK) . . . . . . . . . . . . .
. 2-21
Forms Control Option Kit ( LAXX-KV) . . . . . .
. . . . . . . . . . . . 2-21
Forms Control, Vertical Tabulation, and Horizontal Tabulation
Option Kit ( LAXX-KY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
Automatic Line Feed Option Kit ( LAXX-LA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27
Selective Addressing Option Kit (LAXX-KW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27
Automatic Answerback Option Kit (LAXX-KX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30
EIA Interface Option Kit (LAXX-LG) . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . 2-32
Compressed Font Option Kit ( LAXX-KJ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32
20 mA Cable Option Kit ( LAXX-LH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36
20 mA (DEC 10) Cable Option Kit (LAXX-LK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36
Scale, Pointer, and Window Option Kit ( LAXX-LN) . . . . . . . .
. . . . . . . . . . . . 2-39
DF11 Adaptor Kit (LAXX-KH)
......... _ ....... .
. . . . . . 2-41
Acoustical Coupler Option Kit (LAXX-LM) . . . . . . . . . . . . .
. . . . . . . . . . . . 2-41
SECTION 3

COMMON INFORMATION

LOADING PAPER AND CHANGING THE RIBBON
3-1
Loading Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1
Loading New Forms . . . . . . . . . . . . . . . . . . . . . . . .
3-1
Paper Positioning Procedure . . . . . . . . . . . . . . . .
3-1
Impression Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4
Horizontal Positioning Adjustment . . . . . . . . . . . . . . . . . . . . . . . . .
3-5
Fine Vertical Positioning . . . . . . . . . . . . . . . . . . . .
3-5
Reloading Paper . . . . . . . . . . . . . . . . . _ . . . . . . . .
3-6
3-7
Ribbon Installation . . . . . . . . . . . . . . . . . . . .
DECwriter Interface Information . . . . . . . . . . . . . . . . . .
. . . . . . 3-10
Interface Description . . . . . . . . . . . . . . . . . . . . .
. ... 3-10
Interface Specifications . . . . . . . . . . . . . . . . . . . . .
. . . . . . 3-10
PROGRAMMER'S GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . .
. 3-11
LA36 Programmer's Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Transmitting Characters and Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Soecial Command Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Receiving Characters and Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
OPERATOR CARE, PACKING, AND REPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Operator Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Packing Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19

PREFACE
The LA36/LA35 is a simple, dependable addition to your company's processing system. It has been designed to
maintain optimum performance for many years while keeping maintenance at a minimum.
This user's manual is a guide to the simple procedures required to operate your LA36/LA35. However, to ensure
crisp copies and maximum equipment life, the user must adhere to the following:
•

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

•

Replace the ribbon (when required) only with DIGITAL-recommended ribbons.
NOTE
This manual is applicable to the foHowing model DECwriters:
LA36-CE
LA36-CF
LA36-CH
LA36-CJ
LA36·DE
LA36-DF
LA36-DH

LA36-DJ
LA35-CE
LA35-CF
LA35·CH
LA35-CJ
LA35-DE
LA35·DJ

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

SECTION 1
LA36 USER'S INFORMATION

LA36 GENERAL INFORMATION
INTRODUCTION
The LA36 DECwriter 11 is a medium-sized, low-cost,
interactive data communications terminal. It is designed
as an input/output device that can be used as a system
command console or as a remote communications
terminal.

Preprinted forms can be positioned for the best print-toline-positioning incidence through the use of the manual
vernier paper advance adjustment.

The keyboard is a standard ASCII-coded keyboard,
consisting of alphanumeric characters and nonprinting
system control codes. The ASCII code set consists of
upper and lower case characters and prints at a horizontal spacing of 10 characters per inch and a vertical
spacing of 6 lines per inch. The CAPS LOCK switch on
the keyboard allows selection of a reduced number of
ASCII characters.

The LA36 incorporates a low-speed impact printer for
hard copy output and a standard ASCII keyboard for
transmitting data to the host system or to another data
communication terminal(s).
The printer is capable of handling multipart and multiform line printer paper from 3 to 14-7/8 in. (7.62 to
37.78 cm) wide.

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

Name

Control
Switch/Indicator

Description

LAXX-LB

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
CHARACTER SET
Indicators

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

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 transmission. 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.

1-1

LA36 Options (Cont)
Control
Switch/Indicator

Description

Options

Name

LAXX-KV

Top of Forms
Control

FORMS LENGTH
Switch and SET TOP
OF FORM Pushbutton

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

LAXX-KW

Selective
Addressing

DEVICE SELECT
and SELECT AVAIL
Lamps

The Selective Addressing Option allows the
LA36 to communicate with other terminals on
a single data communications channel.

LAXX-KX

Auto Answerback
and Auto LF
Options

HERE IS, AUTO LF

The Automatic Answerback Option allows the
terminal to transmit a preprogrammed message
of 20 characters (maximum). The message is
initiated by pressing the HERE IS pushbutton,
or upon receipt of the ENO control code from
another device. The LAXX-KX also incorporates the features of the Auto LF option
(LAXX-LA).

LAXX-KY

Forms Control and
Vertical and Horizontal Tabs

Keyboard Keys

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

LAXX-LG

El A/CC ITT
Interface

None

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
Kit

None

The DF11 Mounting Kit enables the user to
mount one of the DIGITAL series DF11
communication options in the LA36.

LAXX-KJ

Compressed Font
Option

None

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 mathematical number sequences.

1-2

LA36 Options (Cont)
Control
Switch/Indicator

Options

Name

Description

LAXX-KZ

Paper Out

PAPER OUT
Lamp

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

LAXX-LC

TTL to CCITT
(V28) Converter
and Modem Protector

None

The TTL to CCITT (V28) Converter and
Modem Protector is a BPO DATEL services
interface that meets the requirements of CCITT
(V28) with BPO-required modem protection
circuitry.

LAXX-LH

Current Loop
Cable

None

20 mA current loop with Mate-N-Lok.

LAXX-LK

Current Loop
Cable

None

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

LA XX-KG

EIA Interface

None

The LAXX-LG interface includes a 9-ft (3.54-m)
cable terminated with a standard EIA connector
(no modem control features).

LAXX-LN

Scale, Pointer,
and Window
Kit

Column scale,
Line Indicator, and
Column Pointer

Operator convenience items that assist in positioning the print head on preprinted forms and
in locating horizontal tabs.

LA36 DECwriter MODEL VARIATIONS
The LA36 variations and associated model numbers are listed below.
LA36-CE
LA36-CF
LA36-CH
LA36-CJ

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

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

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

LA36
LA36
LA36
LA36

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

LA36 JUMPER CONFIGURATIONS

active, half-duplex active, or half-duplex passive, jumpers
on the logic board must be changed. For a detailed·
description of these jumper modifications and the
associated cabling required, refer to the LA36 DEC-

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

writer II Maintenance Manual.

1-3

LA36 Parity
The LA36 is normally configured with no parity, 8th bit
marking on transmit, and no parity error printout. To
modify this configuration for 8th bit on transmit or odd
or even parity with or without error printout, jumpers
on the logic board must be changed. For a detailed
description of these jumper modifications, refer to the
LA36 DECwriter II Maintenance Manual.

LA36 Speaker (Bell) Volume
The LA36 can be configured for a lower speaker volume
by removing a jumper. For a description of this jumper
modification, refer to the LA36 DECwriter II Maintenance Manual.

Keyboard
Standard ANSI keyboard layout
Multikey roll-over
Interface
Integrated 20 mA current loop, with standard or DEC10
cable or EIA/CCITT interface.

LA36 SPECIFICATIONS
Printing
Switch selectable:
throughput

10, 15, or 30 characters/second

Ribbon
DIGITAL-specified nylon fabric (Part No. 36-10558)
Spool assembly: 0.5 in. (1.27 cm) wide X 40 yd
(36.58 m) long

Line Length
132 characters maximum

Power
90-132 Vac or 180-264 Vac
50 or 60 Hz ± 1 Hz
300 W maximum (printing)
160 W maximum (idle)

Spacing
10 characters/in. (horizontal)
6 lines/in. (vertical)
Characters
96 upper/lower case ASCII
7 X 7 dot matrix (0.07 X 0.10 in.) ( 1.77 X 2.54 mm)

Temperature
Operating
10° to 40° C (50° to 104° Fl. noncondensing
Nonoperati ng
-40° to 66° C (-40° to 151° Fl non operating,
noncondensi ng

Paper
Variable width: 3 to 14-7/8 in. (7.62 to 37.78 cm)
Single-Part:
15 lb paper minimum
Card stock thickness of 0.010 in. (0.25 mm)
maximum

Relative Humidity
Operating
10 to 90% with a maximum wet bulb temperature
of 28° C (82° Fl and a minimum dew point of 2°
C (36° F), noncondensing
Nonoperating
5 to 95%

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

1.
2.

Continuous-feed, fan-fold business forms with 3or 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 line is on one margin only). Do not
line glue both margins as air will not be able to
escape and poor impressions will result.

Dimensions
27.5 in. (69.85 cm) wide
33.5 in. ( 85.09 cm) high
24.0 in. (60.69 cm) deep

NOTES
Multipart forms may have only one card part. The
card must be the last part.
NCR or 3M paper, up to 6-part, must use ribbon
on top copy. First surface impact paper is not
recommended.

Weight
102 lb (46.36 kg)

1-4

LA36 OPERATOR'S GUIDE

POWER

orr

J--- MOO£ - + - - S AUD RAH --f
llPf{

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OUT SELECT AVAIL

7622 -28

LA36 OPERATOR CONTROLS AND INDICATORS

Dot on switch
depressed.

NOTE
indicates function of switch when

FDX/HDX Switch
The FDX/HDX switch controls the printing of transmitted keyboa rd characters. When in the FOX position ,
characters typed on the keyboard are transmitted; only
received characters are printed. When in the HDX
position, keyboard characters are both transmitted and
printed; received characters are also printed. The operator should not attempt to transmit data when receiving
data in the HDX mode .

POWER ON/OFF Switch
The POWER ON /OFF switch connects and disconnects
t he line voltage to the LA36 DECwriter II. The POWER
switch should be in the ON position for normal unit
operation . When changing paper, ribbon, or adjusting the
print head, the switch should be turned OFF .

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

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

1-5

Switch

Character Rate

110
300
110 and
300

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

POWER
OH

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OUT SElECT AVAIL

7622 -28

ALT CHAR SET Switch
When an alternate character set is installed, the ALT
CHAR SET switch allows the operator to select either
the standard ASCII character set (switch up) or the
alternate character set (switch down).

is insta ll ed and the AUTO LF switch is enabled, a LF
con t rol code will be transmitted each time a carriage
return code is transmitted.
HER E IS Switch
Th e HE RE IS switch is an optiona l operator control t hat
is inoperati ve unless option LAXX -KX is installed in th e
LA36 . When the LAXX -KX is install ed, depressing th e
HERE IS switch will cause a 20-cha racter preprogrammed message to be transmitted .

CHAR SET LOCK Switch
Th e CHAR SET LOCK switch allows the operator to
select manual (switch down) or automatic (switch up)
character set switching. In th e automatic mod e, the
transmitting device can change the character set by
issuing the character codes Switch In (control -0) or
Switch Out (control-N). Th e Switch In code' selects the
standard ASC 11 character set. The Switch Out code
selects the alternate character set. In the manual mod e,
the character set is selected by the ALT CHAR SET
control switch.

PAPER OUT Indicator
Wh en illuminated, the PAPER OUT indicator gives a
vi sual indication that the LA36 is out of paper. Printing
stops wh en the out of paper condition is detected.
DEVICE SELECT Indicator
The DEVICE SELECT indicator, when illuminated , gives
a visual indication that th e LA36 has been se lected as a
slave te rminal and can transmit data back to the tra nsmitting unit. This indicator is only operative when
Selective Addressing option LAXX -KW is installed in the
LA36.

STD/ALT CHARACTER SET Indicators
The STD/ALT CHARACTER SET indicators give a
visual indication of the selected character set. If no
alternate character set option is installed, the STD
indicator will always be illuminated when power is on.

SELECT AVAIL Indicator
The SELECT AVAIL indicator gives a visual indica tion
that th e data com munication channel is availabl e and
that the LA36 has the a bility to in itiate data transmission. This indicator is only operative when Selective
Addressing option LAXX-KW is installed in the LA36.

AUTO LF Switch
The AUTO LF switch is an optional operator control
that is inoperative unless option LAXX-LA or
LAXX-KX is installed in the LA36. When either option

1-6

POWER

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7622 -28

SHIFT Key
This is a momentary switch which, when depressed ,
allows selection of uppercase for all printable characters.

CTRL Key
The CTR L key provides the LA36 operator with a
method
of
transmittin g ASC 11 contro l codes
(000 8 - 037 8 ). Holding th e CTR L key down and pressing
any a lph an umeri c key or control key ch a nge s th e
sta ndard alp han um eric ASCII code for that key to a
control code (000 8 - 0 37 8 ).

TAB Key

The printe r does not respond to TAB (code 011 8 ) unl ess
option LAXX -KY is installed.

ESC (SEU Key
The ESC (S E L) key generates code 033 8 . This provides
the LA36 operat or with a con venient method of
ge nerat ing an escape command code sequence. The
prin ter does not respo nd to the escape code un less
option LAXX-KY is installed.

CAPS LOCK Key
The 26 letter keys transmit only upper case wh en th e
CAPS LOCK sw itch is down. None of the other keys are
affected .

1-7

POWER
OFF

;

f-- MOOE -+-BAUD R'1E -f

fSfll

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LIN£
LOC•

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CHARACTER SET OUT
SELECT AVAIL

7622 -28

REPEAT Key
The REPEAT key does not ge nerate an ASCII cod e.
However, wh e n t he REPEAT key is held down and any
key is depressed, it causes the ASCII code for that
character to be trans m itted and printed at a re petition
rate of approximately 15 characters/second (until the
key is released).

NOTE
Rapid paper advance can be obtained by placing the
LA36 in t he LOCAL mod e and pressing the LINE FEED
and REPEAT keys.
BACKSPACE Key
The BACKS PACE key generates code 010 8 . The pri nter
contro l logi c causes the print head to move one pos ition
to the left each time a BACKSPACE code is received ,
until the print head reaches the left-hand margin .

RETURN Key
The RETURN key generates code 015 8 . The printer
control logic causes the print head to be repositioned to
th e left-hand marg in each time the carriage return
character cod e is received . If a lin e feed ( LF ) character
code fo llows th e ca rriage return code, the line fe ed
operation is executed simultaneously with the carr iage
return . With options LAXX -LA or LAXX-KX installed,
th e capabil ity of adding a line feed command aft er the
carriage return is inc lu ded .

DELETE Key
The DELETE key generates code 177 8 . The printer does
not respond to the de lete code .
BREAK Key
The BREAK key is provided for users that utilize th e
half-duplex mode of transmission. Th e BREA K key
a llows t he LA36 operato r to interrupt incoming d ata
flow by forci ng the communication li ne from a mark
mod e into th e space mod e (until th e BREAK key is
released). If th e LAXX - LG EIA interface is insta lled, a
short space (230 ms) will be generated .

LINE FEED Key
T he LINE FEED key generates code 012 8 . The printer
will advance the paper one line each time the LF code is
received.

1-8

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

CARRIAGE
ADJUSTMENT
LEVER

7666-16

Paper Advance Knob

The Paper Advance knob pushes in to disengage the lin e
feed gear train, allowing fine vertical adjustment of
paper position. Coarse vertical adjustment is achieved by
simply turning the knob. Each detent turned represents
one line.
PUSH IN HERE
AND TURN T O
ADJUST PAPER - - - - . I
VERTICALLY

PAPER
ADVANCE
KNOB

7595-4

1-9

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

TRACTOR
ADJUST

KNOB

7595-7

Numeric Keypad
The numeric keypad enables numbers to l:ie e nte red in
an adding machine fashion . Each key in th e numer ic
keypad generates the same ASC 11 characte r as th e
corresponding key in the main keyboard . The ENTER
key corresponds to the RETURN key .

7622·9

Bell
The be ll in d icat es t hat a be ll code was recei ved, o r t hat
t he prin t head has reac hed co lumn 6 4.

1-10

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

Load paper (described in Section 3).

Set LINE/LOC switch to LOC.

Set POWER ON/OFF switch to ON.

Select full-duplex
switch).

half-duplex

(FDX/HDX

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

Select AUTO LF, if applicable.

Select desired baud rate (BAUD RATE switches).

Set the LINE/LOC switch to LINE.

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

1-11

LA36 INSTALLATION AND CHECKOUT GUIDE
CAUTION
Before connecting the LA36 to a power source,
ensure that the line voltage and frequency are
compatible with the power requirements of the
machine. Ensure that the POWER switch on the
console is OFF.

GENERAL INSTALLATION INFORMATION
This section contains the step-by-step procedures for
unpacking and unit checkout to ensure that the unit
was not damaged during shipment and that the unit is
operating properly prior to connection to the communication system.
The LA36 DECwriter 11 should be installed in an area
that is free of excessive dust, dirt, corrosive fumes, and
vapors. To ensure that the unit has proper ventilation
and cooling, the ventilation openings on the side of the
cabinet should not be obstructed. A minimum 4-in.
clearance between units must be maintained at all times.
Adequate service clearance must also be provided for
servicing the unit. {Refer to the figure on the following
page.)

UNPACKING AND REPACKING
Unpack the LA36 as described in Section 3. If it becomes necessary to ship the LA36 to another site, refer
to the repacking procedure described in Section 3.

CHECKOUT AND ACCEPTANCE PROCEDURES
Perform the following procedure. If the desired results
are not achieved, refer to the troubleshooting guide in
Section 3.
1.

Install ribbon per ribbon installation procedure
{Section 3).

Install paper per paper loading procedure {Section

Connect the LA36 line cord to the correct wall
receptacle; press the control panel POWER switch
to the ON position. The print head automatically
positions itself to the left margin.

Set the baud rate to 300 and the LINE/LOC
switch to LOC.

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
the print head passes the 64th character position,
the bell tone will sound.

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

After 132 characters have printed, press the
RETURN key and observe the return of the print
head to the "home" position.

Set the BAUD RATE switches to the setting
prescribed for the operating system.
NOTE
Both the 110 and 300 BAUD RATE switches must
be depressed to obtain a baud rate of 150.

3).

1-12

rf 24"==1
( 33.5")
(852mm)

21.7"
( 551mm)

1.5"
(38mm)

L25.0"__J
(635mm)

r-----------1
:
I

SERVICE
AREA

I
I
I

I
I

DIMENSIONS

INCHES

33.5 27.5

MILLIMETERS

852 696 356 610

* 2440

I
*CURRENT LOOP CABLE (BC05F) LENGTH
IS 15 FT ; El A CABLE LENGTH IS 9 FT
(2744mm)

I
SERVICE
I
I
AREA
I
L __________ J
CP·2023

LA36 Site Considerations

1-13

CONTROLS AND INDICATORS FOR LA36 OPTIONS

The following options include additional contro ls not
present on basic LA36 DECwriters.

before the Last Character Vi sibi l ity sh ift , the red
Ii ne after the shift.

FORMS CONTROL OPTION (LAXX-KV)
Thi s option requires the addition of a top -of-form con trol assembly ~ which is installed beneath th e top cover
on the print head chassi s. The re are two controls on this
assembly : SET TOP OF FORM and FORM LENGTH
(Figure 1).

ACOUSTICAL COUPLER OPTION (LAXX-LM)
Th ere is a single in dicator associated with this option.
Thi s red indicator is mounted on the right side of th e
cover and li ghts when the t elephone hand se t is properly
inse rted in the muff asse mbly and a carrier is detected
by the coupler circu itry .

•

SET TOP OF FORM is a pushbutton that clears
the previously loaded form length and load s the
current setting of the FORM LENGTH sw itch .

•

FORM LENGTH is a 12-position rotary switch
that is used to preset a form lengt h (in inch es) into
th e Forms Control.

FORMS CONTROL, VERTICAL TABULATION, AND
HORIZONTAL TABULATION OPTION (LAXX-KY)
Thi s option also utili zes the top-of-form contro l assembly (Figure 1) _
SCALE, POINTER, AND WINDOW OPTION (LAXX-LN)
Thi s option contain s three indicators: Column Scale,
Line Indi cator, and Colum n Pointer as shown in Figure 2.
7622-4

•

The column scale is a 17 .25-in . long strip that is
marked off in 132 divi sion s represe nting th e possible column location s. Th e column scale adh eres
to th e plastic print window .
•

•

Figure 1 Forms Control A ssemb ly

Th e line indicator mounts on th e print head and is
used to establ ish tw o printing locations. The
longer top surface indicates t he baseline of the
characters in a particular line. Wh en setting up a
form or rolling back t o a pre viously printed lin e,
thi s top surface is used to exactly al ig n where th e
next character wi ll print. Th e smaller surface on
th e right side ind icat es the position where the next
character will print. T his position is valid only
after th e Last Character V is ibil ity shift. Th e lin e
indicator is also included in the APL/ASCII Du al
Charact er Set Option (LAXX-PK) .

GREEN
PO SITION OF
NEXT CHARACTER
TO BE PRINTED
CHARACTE R
BASELINE

LINE INDICATOR

Th e column indicator is used in con juncti on w ith
the column sca le. Th ere are red and green indica tor lines on th e co lum n indicator to indicat e th e
next column to be printed. Th e green lin e is used

Figure 2

1-14

CP- 2099

Line Indicator and Coiumn Pointer

SETUP AND OPERATING PROCEDURES FOR LA38 OPTIONS

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

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

NOTE
Throughout the operating and checkout .procedures, the
Control Key (CTRL) and Escape Key (ESC) are used in
conjunction with both alpha and numeric keys to enter
commands into the DECwriter. When a procedure
requires typing a command, the operator should depress
and hold the command key and then depress either the
alpha or numeric key.

Keyboard location of the alternate APL characters is
shown in Figure 3. The standard ASCII characters are
shown on top of the keys, and the APL symbols are on
the front of the key caps.
Figure 4 shows the bit assignments for both character
sets.

APL OPTION (LAXX-PK)
An LA36 DECwriter containing this option can print
either the standard ASCII characters or the alternate
APL characters. The position of the front panel CHAR
SET LOCK switch establishes whether control over
character
set
switching
is operator-determined
(manually) or computer-determined (by programming).

FORMS CONTROL OPTION (LAXX-KV)
Setup - (The DECwriter is assumed to be deenergized.)
Measure the form to determine its length in inches. Then
remove the top cover from the LA36 as in paper loading
procedures. On the Forms Control panel, set the FORM
LENGTH rotary switch to the number that corresponds,
in inches, to the length of the form (Table 1). Proceed
with the normal loading of the forms. When completed,
use the Paper Advance knob to align the top line of the
form with the print head. (Normally the top line is 2 or
3 lines below the perforation, but it can be established at
any line on the form.) Close the top cover and energize
the DECwriter. The form length indicated by the FORM
LENGTH switch is automatically entered during the
power-up sequence.

In the up position, the CHAR SET LOCK switch permits
the transmitting device to change character sets by
sending either a CTRL 0 (Switch In) or CTRL N
(Switch Out) command. CTR L 0 (code 0168 ) selects
the standard ASCII character set; CTR L N (code 017 al
selects the alternate APL set.
When the CHAR SET LOCK switch is in the down position, the operator can manually select either available

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CP-2100

Figure 3

Key Caps Locating APL Characters

1-15

~
~s
6

t
~

0
0
0

0
0

DLE
DC!
DC2
DC3
DC4
NAK
SYN
ETB
CAN
EM
SUB
ESC
FS
GS
RS

-··
....··

'i~

2
3
4
5

12
13
14
15

FF
CR

0
I

0
0

NUL
SOH
STX
ETX
EOT
ENQ
ACK
BEL
BS
HT
LF

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0

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v

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8

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DEL

a. Standard (ASCII) Character Set

0
0
b,

.).

~
0

3
4
5

12
13
14

NUL
SOH
STX
ETX
EOT
ENQ
ACK
BEL
BS
HT
LF
VT
FF
CR

0
I

0
b4

0
0

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DC2
DC3
DC4
NAK
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FS
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b. Alternate (APL) Character Set

Figure 4 Bit Assignments for ASCII and APL
Character Sets

1-16

The procedure for setting up the Forms Control Option
when the DECwriter is energized is the same except that
the SET TOP OF FORM pushbutton has to be pressed
after the form length is selected.

and 063 8 remotely. Advance the form to the next
vertical tab and store this location in the same manner.
The number of tabs that can be set is limited by the
number of printable lines on the form used. For
example, an 11-in. deep form could have up to 66
vertical tabs.

Operation - The operator can generate a Form Feed
command by typing CTR L L. The program-generated
Form Feed (FF) command is 014 8 . Upon receipt of a
Form Feed command, the paper will advance to the next
top-of-form line.

Table 1
FORM LENGTH Switch Positioning

Form Length
(inches)

FORM CONTROL PROGRAMMING
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 input rate
while the printer mechanism is positioning the
form. The best way to determine the required
number of these fill characters is to count the
number of lines from the last line printed to the
bottom of the form and insert this number of fill
characters. In character combinations when the
character buffer is empty before a carriage return,
15 fill characters can be subtracted from the above
number. All fill calculations are made at 300 baud.
For 150 baud, halve the values (round off to the
next higher number); for 110 baud, use one third
(round off to the next higher number).

3
3.5
4
5.5
6
7
8
8.5
11
12
14

FORM
LENGTH
Switch Setting

Printable Lines
Per Form (Maximum)

3
3.5
4
5.5
6
7
8
8.5
11
12
14

18
21
24
33
36
42
48
51
66
72
84

To clear all vertical tabs, type ESC 4 or issue codes 0338
then 064 8 remotely. All tabs are cancelled (cleared)
during a power-up sequence.

Once a form feed has begun, it cannot be aborted.
If a second Form Feed command is issued within
16 lines from the next top of form, the paper will
not stop at that next top of form, but will execute
the second Form Feed command and skip one full
form length. If the second Form Feed command is
issued with 17 or more lines remaining to the
bottom of the present form, it will be ignored.
Likewise, more than two Form Feed commands
within one form interval will not be recognized.

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

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

FORMS CONTROL, VERTICAL TABULATION, AND
HORIZONTAL TABULATION OPTION (LAXX-KY)
Setup - This option requires three setup procedures.
Forms Control Setup - Exactly the same as in the
Forms Control Option (LAXX-KV).
Vertical Tabulation Setup - First perf.orm 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 033 8

1-17

VERTICAL TABULATION PROGRAMMING
NOTES
Similar to the form feeding sequence, the vertical
tabulation action requires fill characters to slow up
the input data while the mechanism is advancing
the form. Use the same rule as before to determine
the number of fill characters.

horizontal tab location. 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.

ignored. Likewise, more than two Vertical Tab
commands within one tab interval will not be
recognized.
Horizontal Tabulation Setup - Before setting horizontal
tabs, issue a carriage return (either from the keyboard or
remotely by code 015 8 ). This ensures that the print
head starts at the left margin. Issue space characters (by
keyboard space bar or by code 040 8 ) until the print
head is positioned at the desired horizontal tab location.
To store this location, type ESC 1 or issue codes 033 8
then 061 8 .

AUTOMATIC LINE FEED OPTION (LAXX-LA)
The Auto Line Feed action is controlled by the setting
of the front panel AUTO LF switch and the presence of
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.
Table 2
Auto Line Feed Setup

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

Position of
AUTO LF
Switch

Then space the print head to the next desired tab
location and store this location in the same manner. The
number of horizontal tabs that can be set is limited by
the available number of print columns on the form. For
example, a 17-i n. wide form can have up to 132 tabs.
Striking the TAB key will initiate a horizontal tab move.
To clear all horizontal tabs, type ESC 2 or issue codes
033 8 then 0628 remotely. All horizontal tabs are
cancelled (cleared) during a power-up sequence.

If a Horizontal Tab command is received and there
are no tab locations set, the print head will
advance to column 132 and remain there until a
carriage return is received.

Initiating
Action

Number of
Line Feeds
Transmitted
or Received

Transmit Mode

HORIZONTAL TABULATION PROGRAMMING
NOTES
1.
To ensure against loss of data while the printer
mechanism is executing horizontal tabs, fill characters are used to effectively slow up incoming
data. The number required is determined by
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
carriage return time. In instances where the tab
does not follow a carriage return, only 0.55 times
the number of spaces are needed for fills. All fill
calculations are made at 300 baud. For 150 baud,
halve the value (round off to the next higher
number); for 110 baud, use one third (round off
to the next higher number).

JumperW1
In or Out

N/A

Type
RETURN

Down

N/A

Type
RETURN

Receive Mode
N/A

Receive CR
with LF
Receive CR
without LF

N/A

Out

Receive CR
with LF
Receive CR
without LF

When operated in thE' receive mode with W 1 not cut out,
the DECwriter will automatically insert a Line Feed
command after each Carriage Return command received.
This is a convenience for existing programs that do not
normally have a Line Feed after a Carriage Return
command. To disable this automatic insertion of the
Line Feed command, cut jumper W1 located on the
Automatic Line Feed Option circuit board.

1-18

AUTOMATIC LINE FEED PROGRAMMING
NOTES
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, 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 ANSWER BACK 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 ENO (005 8)
command is received.

Under the 7-bit code, a practical limit of 123 devices
may be interrogated, since the selection command codes
(CTRL D, CTRL E, CTRL B, CTRL C, and CTRL Fl
should not be used as addresses. However, it may be
advisable to set the Iimit 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.

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.

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:

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

1.
2.

•

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
with all the other terminals (designated as slaves)
in the network.

•

Broadcast Slave - A condition that allows all
terminals in the network to receive data transmitted by the master.

•

Group Select Slave - When addressed by the
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
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 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.

NOTES
Spaces are counted as characters.
Messages shorter than 20 characters can be terminated by making the last character a NU L
(0000000).
All
remaining
characters
are
disregarded. A full 20-character message does not
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
contains two factory-installed jumpers (Figure 16) that
can be cut out to eliminate certain operations of the
auto line feed function. The possible jumper
configurations are:
Jumpers
W1

In
In
Out
Out

In
Out
In
Out

Action
Add LF to
Received CR
Yes
Yes
No
No

Insert LF After
Keyboard Typed CR
Yes
No
Yes
No

1-19

a.=1100001

CP-2101

Figure 5

Location of 20 Answerback Message Characters

1-20

EXAMPLE

5=0110101
ON7654321

f~~~~~~~

GROUP
ADDRESS SWITCH

CP-2189

Figure 6 Location of Address Setting Switches

1-21

MASTER TERMINAL

I BROADCAST SLAVES
f (ALL 6)

GROUP SLAVES
(1,2,63)

I UNIQUE SLAVE
f (JUST# 3)
2

SLAVE TERMINALS

CP- 2188

Figure 7 Typical Selective Addressing Communications
Network

Figure 7 depicts a communications network of seven
terminals. It is assumed that terminal A is the master and
the other six are slaves, each with a unique address;
terminals 1, 2, and 3 have the same group address while
4, 5, and 6 have a different group address. When the
master (A) transmits in broadcast, all terminals print the
transmission. When the master addresses the three having
the same group address, only these three receive the
transmitted 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 two. In addition, the master can address multiple
unique addresses to form other groups (i.e., terminals 1,
3, and 6 can be grouped to receive the same data if the
master sequentially addresses these terminals).
Slave terminals operate in either the address mode or
data mode. In the address mode, terminats respond to
character combinations that make up their broadcast,
unique, or group addresses. In the data mode, they do
not acknowledge their addresses, even though the
address is present on the communications line. The
master terminal establishes whether the slave terminals
are in one mode or the other.
The following six commands are generated at the master
terminal and control the operation of the communications network.

CTRL G (BELL) - Used to select all terminals to
receive simultaneously (broadcast mode). Until a
CTRL B has been received, the BELL code does
not cause the bell on the printer to sound.

CTRL B (STX) - Used to "lock" all terminals in
their selected or unselected mode and to prevent
an unintentional selection during data transmission. No terminal begins to print until CTRL B
is received. The terminal uniquely addressed
before the CTR L B command has its keyboard
enabled for transmission, thus allowing a 2-way
communication.

CTRL E (ENO) - Only used with uniquely
selected slave terminals (has no effect on broadcast
and group selected slaves). When a uniquely
selected slave terminal has an Auto Answerback
Option (LAXX-KX) installed and receives a CTRL
E, the stored answerback message is sent back to
the master terminal. This allows verification that
the correct slave terminal is being addressed. The
answerback message is transmitted after the EIA
interface CLEAR TO SEND signal goes high.

CTRL E can also be used to disable the
transmitting capability of a uniquely selected
slave. Normally a uniquely selected slave can
transmit back to the master but it can be disabled
by the following commands from the master:
unique address, CTR L E, then any character or
command except CTR L B.

CTRL SPACE (NUL) - Used after a terminal has
become master to reset all slave terminals to their
address mode. This action occurs before the
master sends addresses down the line.

1-22

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

Group
Type group address.
Type CTRL B.
Send message - All terminals in group receive but
cannot transmit.
Type CTR L D at the end of a message.

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 8). This leaves all
slaves transmit-disabled.

Unique Select (2-way)

Type Unique Address.
Type CTRL E.
Type CTRL B.
Send message - Both master and slave
transmit and receive.
Type CTR L D at the end of a message.

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 CTR L B to lock all devices into
either the selected or unselected modes.

can

Unique Select (1-way)

Type unique address.
Type CTR LE.
Type any character other than a valid address.
Type CTR LB.
Send message - Slave can receive but not transmit.
Type CTR L 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:

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

Type CTRL C.
Type new address or addresses.
Type CTRL B.
Send message.
Type CTR L D at the end of a message.

A terminal becomes master and places the slaves in
address mode by performing the following sequence:
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 CTR L SPACE.

After becoming master, this terminal can establish the
type of slaves in the network as follows:
Broadcast
Type CTRL G.
Type CTRL B.
Send message - All terminals receive but cannot
transmit.
Type CTRL D at the end of a message.

1-23

SELECTIVE ADDRESSING PROGRAMMING
NOTES
Anytime more than one terminal is uniquely
selected, a CTR L 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 CTR L 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.

In applications where the EIA signal CLEAR to
SEND is always high, the command CTRL SPACE
is not required.

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
Figure 8 contains three basic cabling diagrams for the
LA36. These diagrams depict the cabling configurations
between the M7728 logic board and the Expander
Mounting Option (LAXX-LB) for the various option kits
available. Before installing any option, it is recommended that these diagrams be consulted to ensure
proper cabling.

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

Carefully replace the logic board on top of the
grommets and secure with the six screws and
associated washers previously removed.

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

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.

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

10.

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

11.

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

EXPANDER OPTION MOUNTING KIT (LAXX-LB)
The Expander Option
following:
Quantity

4
2

Mounting

Item
Option Distribution
Board Assembly
Right-Hand Side Rail
Assembly
Left-Hand Side Rail
Assembly
Grommets
Interconnecting Cables
Keyboard Cable
+5 Volt Power Cable

Kit contains the

Part Number

See
D·UA· LAXX-LB-0

9007017-00
C-IA-BC08S-1B
C-IA-7008612-4A
C-IA-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
facing up and the other end has the smooth side
up. Ensure that A connects to A at each cable end.
Failure to observe this polarity may cause a logic
board failure.

A nut driver, Phillips, and straight blade screwdrivers are
required to install the Expander Option Mounting Kit.
Use Figures 8, 9, and 10 and the following procedure as
installation guides.
1.

Unplug the ac power cord. Remove the paper, top
cover, and plastic housing from the unit.

Unhook all cables from the logic board.

Remove the six screws and washers that secure the
logic board to the cabinet door and then remove
the logic board. The keyboard cable clamp should
also be removed from below the logic board.

Place the right and left side brackets ( 1 in Figure
10) over the screw studs as shown. The hinge tabs
of the side brackets (2) should be pointed inward
toward each other and toward the interior of the
cabinet.

12.

Reconnect the +5V supply cable (black and red
wires) to the logic board. Connect one end of a
similar cable (supplied with this option) to the +5
and GND terminals of the power board and the
other cable end to the Faston terminals (7 in
Figure 10) on the option distribution board
assembly. Route the cable with existing cables to
the power board.

13.

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

14.

Remove the four screws, lock washers, flat washers
(1 in Figure 9), and spacers (2 in Figure 9) that
secure the keyboard bezel to the cabinet base.

1-25

TO J1
POWER BOARD
20mA SERIAL
INPUT (IF USED)

M7728 LOGIC BOARD

A. NO OPTIONS INSTALLED

TO J1
POWER BOARD
20mASERIAL
INPUT (IF USED)---....,

EIA INPUT
(IF USED)

TO J2 FRONT
_ _ __.__ PANEL CONTROL
BOARD
M7728
LOGIC BOARD
EXPANDER MOUNTING
OPTION (LAXX-LB)

B. ANY OPTION
AND AUTO LI NE FEED OR AUTO ANSWER BACK OPTIONS
NOT INSTALLED

TO J1
POWER BOARD
20mA SERIAL
INPUT (IF USED!

EIA INPUT
(IF USED!

TO J2 FRONT
----+--PANEL CONTROL
BOARD
M7728
LOGIC BOARD
EXPANDER MOUNTING
OPTION
(LAXX-LB)

C. ANY OPTION AND
AUTO LINE FEED OR AUTO ANSWERBACK OPTIONS INSTALLED
CP-2102

Figure 8 Cabling Configurations for Various LA36
Options

1-26

)
INSULATOR
.. WASHER

RED
STRIPE
CP-2103

Figure 9

board an d Bezel Assem bl Y _Cabling
and Hardware

1-27

DOOR (DECWRITER 'JI)
REF

CP-2104

Figure 10 Installation of Expander Mounting Kit

(LAXX-LB)

1~2a

15.

Turn the bezel upside down on a piece of foam or
bubble plastic and remove the four Kep nuts (9
Figure 9) that secure the front panel control
assembly to the bezel. Leave the four hex
standoffs in place.

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

APL OPTION KIT (LAXX-PK)
NOTE
In some instances it may be necessary to remove
the keyboard assembly before the front panel
control assembly can be removed.
16.

17.

Quantity

Connect one end of the front panel control cable
to J2 as shown in 10, Figure 9. Ensure thatthe red
stripe on the ribbon cable is as indicated.
Feed the cable across the cabinet and down
through the access hole and to J4 (8), Figure 9 on
the option distribution board assembly. Ensure
that the red stripe on the cable is positioned as
shown in Figure 10.
NOTE
If either the APL Option (LAXX-PK), Paper Out
Option (LAXX-KZ), or the 14-Key Numeric Keypad Option (LAXX-KE) is also being installed, the
applicable installation procedure should be consulted before the keyboard bezel is secured back
onto the cabinet base.

18.

The APL Option Kit contains the following:

4
4

Replace the front panel control assembly on the
standoffs and secure with four Kep nuts. Provide
adequate cable clearances around all standoffs.

20.

APL/ASCII Dual Character Set Board
Edge Connector
APL ROM
APL ROM
Phillips Pan Head
Screws (#34-40
X 0.38 in.)
Flat Washers (#4)
Lock Washers (#4)
Line Indicator
APL Keyboard

D-CS-M 7732-0-1
B-UA-H851-0-0
23086A6
23087A6
9006011-1

9006655
9006688
C-MD-7414953-0-0
D-AD-7011055-0-0

NOTE
Unplug the DECwriter and remove paper.
1.

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

Refer to Figure 8 for the correct interface cabling
required to integrate the APL Option into the
existing options.

Using the supplied hardware ( 1 in Figure.11) (four
#4-40 X 0.38-in. screws and #4 washers), secure
the APL board in location F on the expander
board (Figure 11).

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

Insert the two APL ROMs: No. 23087A6 in socket
(3) and No. 23086A6 in (4). Refer to Figure 11
for Pin No. 1 locations.

Remove the cover and top plastic housing from
the DECwriter.

Replace the keyboard bezel on the cabinet base
and secure with the four screws, lock washers, flat
washers, and spacers.
CAUTION
The keyboard bezel should be positioned as far
forward as possible to eliminate interference
between the keyboard cable and print head
assembly.
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
with the keyboard connector.

Part Number

A Phillips screwdriver and a 11/32-in. nut driver are
required tools for installation. Use Figures 9 and 11 plus
the following procedure as installation guides.

CAUTION
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
install washers at required points may cause_circuit
damage.

19.

Item

Replace the plastic housing and cover.

1-29

c p -2105

Figure 11

Installation of the APL/ASCII Dual Character
Set Board

1-30

CAUTION
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 th.e cable and print
head assembly.

Remove the two front screws (5) and associated
washers from the print head, install the line
indicator (6) as shown, and reassemble the
removed hardware.
NOTE
Unless otherwise specified, all following references
are made to Figure 9.

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

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.

NOTE
In some instances, it may be necessary to remove
the control panel board before the keyboard can
be removed.
15.

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

10.

11.

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.

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).

16.

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

12.

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

13.

Replace the front panel control assembly on the
standoff and secure with the Kep nuts.

CAUTION
The keyboard bezel should be positioned as far
forward toward the operator as possible to eliminate interference between the keyboard cable a·nd
print head assembly.
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
with the keyboard connector.

CAUTION
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.

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

17.

Reconnect the Berg connector to J2 on the new
keyboard. If required, reconnect the cables at Jl
and J3. Ensure that the red stripe on each cable is
positioned as shown in Figure 9.

Replace and secure the plastic housing and replace
the cover.

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
print APL characters as typed.

1-31

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 module board.
Connect the two push-on leads to the terminals on
the SET TOP OF FORM switch (3) and plug in the
8-pin connector as shown.

The Forms Control Option Kit contains the following:

Quantity

4
6
4
4

Item

Part Number

Top-of-Form Control
Assembly Board
Top-of-Form Module
Board
Top-of-Form Cable
Phillips Pan Head
Screws (#4-40
X 3/8 in.)
Phillips Pan Head
Screws (#6-32)
X 3/8 in.)
Edge Connector
Lock Washers (#4)
Lock Washers (#6)
Flat Washers (#4)
Flat Washers (#6)

D-AD-7011503-0-0

Install the top-of-form control assembly using the
previously removed #8-32 X 3/8-in. screw and. #8
washers as shown 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.

Feed the cable under the printer mechanism then
down 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 connector and board are keyed for proper fit) and the
8-pin connector (6) and two push-on connectors as
shown.

12.

Replace the top cover.

D-CS-M 7735-0-1
D-IA-7011516-0-0
9006011-1

9006022-1

B-UA-H851-0-0
9006688
9007801
9006655
9006653

A Phillips screwdriver is the only tool required for
installation. Use Figure 12 and the following procedure
as installation guides.
1.

Unplug the ac power cord and open the top cover.

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

Test
After
procedure:

Refer to Figure 8 for the correct interface cabling
required to integrate the Forms Option into the
existing options.

Energize the DECwriter, load paper, and set the
FORM LENGTH switch to correspond to the
length of the form in inches. Press and release the
SET TOP OF FORM pushbutton.

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

Type any character on the keyboard, then type
CTR L L. The paper should feed and stop at a
distance that is equal in inches to the switch
setting. Repeat this procedure for two other
switch settings, one longer, the other shorter than
this setting. Press the SET TOP OF FORM
pushbutton after changing the setting.

Set the FORM LENGTH switch to 3 and press the
SET TOP OF FORM pushbutton. Press the LINE
FEED key 17 times, then type CTRL L. The paper
should increment only one line.

Remove and save the bracket hardware (2) (#8-32
X 3/8-in. screw, #8 lock washer, #8 flat washer).

Attach the speaker to the inside of the top-of-form
control assembly (1). Use four #6-32 X 3/8-in.
screws, #6 flat and lock washers and secure from
the inside as in (4).

The top-of-form cable has two distinct ends,
differing by the length of the wire leads and type
of push-on connectors. The cable end with the

1-32

Installation - Perform

the

following

OPTION MOUNTING
(LAXX-LB)

FORM CONTROL
ASSEMBLY BOARD
CP-2106

Figure 12

Installation of Forms Control Option Kit
(LAXX-KV)

1-33

FORMS CONTROL, VERTICAL TABULATION,
AND HORIZONTAL TABULATION,
OPTION KIT (LAXX-KY)

Attach the speaker to the inside of the top-of-form
control assembly (1). Use four #6-32 X 3/8-in.
screws, #6 flat and lock washers and secure from
the inside as in (4).

The Forms Control, Vertical Tabulation, and Horizontal
Tabulation Option Kit contains the Forms Control
Option Kit (LAXX-KV} and the following:

The top-of-form cable has two distinct ends,
differing by the length of the wire leads and the
size of the push-on connectors. The cable end with
the longer leads anp smaller connectors connects
to the top-of-form control assembly and the other
end to the HT-VT-TOF module board. Connect
the two push-on leads to the terminals on the
bottom of the SET TOP OF FORM pushbutton
(3) and plug in the 8-pin connector as shown.

Install the top-of-form control assembly using the
previously removed #8-32 X 3/8-in. screw and #8
washers as shown in (2). Then secure with two
#6-32 X 3/8-in. screws and #6 washers as shown in
(5). Screw in from the outside of the bracket.

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

Install the H851 edge connector (7) in location A
(edge connector and board are keyed for proper
fit) and the 8-pin connector (6) and two push-on
connectors as shown.

Quantity

1
2

1
2
6
2
4

Item

Part Number

Top-of-Form Control
Assembly
HT-VT-TOF Module
Board
Top of Form Cable
Phillips Pan Head
Screws (#4-40
X 3/8 in.)
Phillips Pan Head
Screws (#6-32
X 3/8 in.)
Edge Connector
Lock Washers (#4)
Lock Washers (#6)
Flat Washers (#4)
Flat Washers (#6)

D-AD-7011503-0-0
D-CS-M7736-0-1
D-IA-7011516-0-0
9006011-1

9006022-1

8-UA-H851-0-0
9006688
9007801
9006655
9006653

A Phillips screwdriver is the only tool required for
installation. Use Figure 13 and the following procedure
as installation guides.
1.

Unplug the ac power cord and remove the top
cover.

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

Refer to Figure 8 for the correct interface cabling
required to integrate the Forms Control Option
into the existing options.

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

Remove and save the bracket hardware (2) {#8-32
X 3/8-in. screw, #8 lock and flat washers).

NOTE
Only one H851 edge connector is needed. Do not
install two connectors.
12.

Replace top cover.

Test After
procedure:

1-34

Installation

Perform

the

following

Load paper, energize the DECwriter, and set the
FORM LENGTH switch to correspond to the
length of the form in inches. Press and release the
SET TOP OF FORM pushbutton.

Type any character on the keyboard, then type
CTR L L. The paper should feed and stop at a
distance that is equal in inches to the switch

EX PANDER OPTION
MOUNTING KIT
(LAXX-LB)

M7728

LOGIC
BOARD

TOP OF FORM
V ERTi CAL 8 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
switch settings, one longer, the other shorter than
this setting. Press the SET TOP OF FORM
pushbutton after changing the setting.
3.

Set the FORM LENGTH switch to 3, and press the
SET TOP OF FORM pushbutton. Press the LINE
FEED key 17 times, then type CTRL L. The paper
should increment only one line.

After ensuring correct operation of the Forms
Control function, set the TOF for 11-in. form
paper. (Set switch at 11; press pushbutton.)

Typean"A."

Type CTR L K; the DECwriter will line feed 11 in.
Type a "B."

Press the LINE FEED key 10 times, type ESC 3,
then type a "C."

Type CTRL L. Type a "D." Manually turn the
paper back until the print head aligns at the line
where "B" was printed.

Type CTR L K, then type an "E" (will print next
to previously printed "C").

10.

Type CTR L K, then type an "F" (will print next
to previously printed "D").

11.

Type ESC 4, then manually turn the paper back to
the line with "B" on it.

12.

Type CTR L K; the print head will align on the line
containing "D" and "F ."

13.

Type LINE FEED, RETURN, and TAB. The print
head will move to the right margin (column 132).

14.

Type RETURN, then press the space bar eight
times.

15.

Type ESC 1, then type "A."

16.

Space eight times; type ESC 1; type "B."

17.

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

18.

Type RETURN; type LINE FEED.

19.

Type TAB; type "D."

20.

Type TAB; type "E."

21 .. Type TAB; type "F."
22.

Type TAB; the head will move to column 132.
The printed characters will be in two Iines with the
top line one character space to the right of the
second line.

23.

Type RETURN, type TAB twice, then press
BACKSPACE ten times.

24.

Type TAB; type "G."

25.

Type TAB; type "H." The characters "G" and
"H" will overprint on the previously printed "E"
and "F."

26.

Type ESC 2, RETURN, and then TAB. The print
head will move to column 132. The test is
completed.

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

Item

Part Number

1
2
3

Auto Line Feed Board
Edge Connector
Phillips Pan Head
Screws (#4-40
X 0.38 in.)
Lock Washers (#4)
Flat Washers (#4)

D-CS-M 7738-0-1
B-UA-H851-0-0
9006011-1

3
3

9006688
9006655

A Phillips screwdriver is the only tool required for
installation. Use Figure 14 and the following procedure
as installation guides.

1-36

Unplug the ac power cord.

If 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.

Using the supplied hardware (1) (three #4-40 X
0.38-in. screws and #4 washers). secure the Auto
Line Feed board in locations C and D on the
expander board. As shown, one of the mounting
holes should not be secured.

EXPANDER
OPTION MOUN Tl NG
(LA XX-LB)

AUTO LINE FEED
BOARD

CP-2 IOB

Figure 14 Installation of Automatic Line Feed Option
(LAXX-LA)

1-37

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

Test After Installation - Load paper and energize. In the
local mode, with the front panel AUTO LF switch in the
up position, type RETURN; a carriage return and one
line feed should occur. Press the AUTO LF switch and
type RETURN; a carriage return and two line feeds
should occur.

Properly interface the DECwriter with the Selective Addressing option to another DECwriter
without this option. (EIA interface or any other
type of communications interface is acceptable.)

Energize both terminals; set both to the same baud
rate, line mode, and full duplex operating
conditions.

SELECTIVE ADDRESSING OPTION KIT (LAXX-KW)
The Selective Addressing Option
following:
Quantity

NOTE
In the following procedure, the terminal with the
Selective Addressing Option is designated as "A"
and the terminal wfthout the option designated
''B.''

Kit contains the

Item

Part Number

Selective Addressing
D-CS-M 7737-0-1
Edge Connector Board B-UA-H851-0-0
9006401-04
Phillips Pan Head
Nylon Screws
(#4-40 X 0.38 in.)

EIA Interface Cable

Unplug the ac power cord.

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

Refer to Figure 8 for the correct interface cabling
required to integrate the Selective Addressing
Option into the existing options.

On terminal A, the front panel SELECT AVAi L
light is illuminated.

On terminal A, type CTRL D. The SELECT
AVAIL and DEVICE SELECT lights will be
illuminated on terminal A.

On terminal A, type CTRL SPACE (NULL), then
type CTR L B. Both terminals can send and
receive.

On terminal A, type CTRL D. The DEVICE
SELECT light extinguishes.

Type any character on terminal B; it is not printed
by A. The SELECT AV Al L light on terminal A
exti.rlguishes. A cannot send or receive.

C-1A-7010489-0-0

A Phillips screwdriver is the only tool required for
installation. Use Figure 15 and the following procedure
as installation guides.

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

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

On terminal B, type CTRL SPACE, CTRL G, then
type CTRL B. Terminal A can receive from B, but
not send.

On terminal B, type CTR L 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
interface cable ( 1) should be connected as shown
(lug G on the EIA board to lug GND on the
Selective Addressing board).

Test After
procedure:

Installation - Perform

the

NOTE
Steps 10 through 13 set up terminal A as a group
selected slave.

following

10.

1-38

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

EIA OPTION
(LAXX-LG)

EXPANDER
OPTION MOUNTING
KIT (LAXX-LB)

CP-2109

Figure 15

Installation of Selective Addressing
Option Kit ( LAXX-KW)

1-39

11.

On terminal B, type the group select code that was
entered into the switches on the Selective Addressing circuit board installed in terminal A.

22.

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

12.

On terminal B, type CTRL B. Terminal A can
receive from B, but not send.

23.

13.

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

On terminal B, type A's unique select code. The
DEVICE SELECT light on A does not illuminate;
then type CTR L C and A's code again. The
DEVICE SELECT light illuminates now.

24.

On terminal B type CTRL B. Both terminals can
send and receive. Then type CTRL D. The
DEVICE SELECT extinguishes and SELECT
AVAIL light illuminates on terminal A.

NOTE
Steps 14 through 18 set up terminal A as a
uniquely selected slave (case 1 ).

14.

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

15.

On terminal B, type A's unique select code that
was entered into the switches on the Selective
Addressing circuit board installed in terminal A.

16.

17.

18.

On terminal
illuminates.

AUTOMATIC ANSWERBACK OPTION KIT
(LAXX-KX)
The Auto
following:

Answerback

Option

Kit

contains the

A, the DEVICE SELECT light
Quantity

On terminal B, type CTRL E, then CTRL B. Both
terminals can send and receive. If the Answerback
Option is installed in terminal A, the answerback
message will print on terminal B after CTR L E is
typed.

2
4

4
4

On terminal B, type CTRL D. On A, the DEVICE
SELECT light extinguishes and the SELECT
AVAi L light illuminates.

Item

Part Number

Auto Answerback Board
Edge Connectors
Phillips Pan Head
Screw (#4-40 X
0.38 in.)
Lock Washers (#4)
Flat Washers (#4)

D-CS-M 7733-0-1
B-UA-H851-0-0
9006011-1

9006688
9006655

A Phillips screwdriver is the only tool required for
installation. Use Figure 16 and the following procedure
as installation guides.

NOTE
Steps 19 through 21 set up terminal A as a
uniquely selected slave (case 2).

Unplug the ac power cord.

19.

Repeat steps 14 through 16.

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

20.

On terminal B, type CTRL E, then any character
(A's DEVICE SELECT extinguishes), then CTRL
B. Terminal A can receive but not send.

Refer to Figure 8 for the correct interface cabling
required to integrate the Auto Answerback
Option.

Using the supplied hardware (1) (four #4-40 X
0.38-in. screws and associated washers), secure the
Auto Answerback board in locations C and D on
the expander board.

21.

On terminal B, type CTRL D. On terminal A, the
SELECT AVAIL light illuminates.
NOTE
Steps 22 and 23 set up terminal A as a uniquely
selected slave (case 3) with add-on capability.

1-40

M7728
LOGIC

BOARD

CP-2110

Figure 16 Installation of Automatic Answerback
Option Kit ( LAXX-KY)

1-41

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

Enter the answerback message using the 7 slide
switches on the 20 character switches. Use the
standard ASCII code. The ON switch position is
the asserted state (high) and slide switch No. 1
corresponds to b1 of the 7-bit character.

The EIA circuit board has two wire jumpers that allow
selection of the type of BREAK and DATA TERMINAL
READY signals that are output by the E IA interface.
Depending on the presence of these jumpers, any of the
following four terminal conditions produce the output
signals.

Test After Installation - Install paper and energize. In
the local mode, pressing the front panel HERE IS switch
institutes a printout of the answerback message. When
on-line, a received ENQ command (005 8 ) will generate
the answerback message.

Paper Out
Switch to Local Mode
Power-up Sequence Not Completed
Terminal Power Switched Off
The status of these jumpers produce the following
outputs for any of the above conditions.

In the local mode, with the front panel AUTO LF switch
in the up position, type RETURN; a carriage return and
one line feed should occur. Press the AUTO LF switch
and type RETURN; a carriage return and two line feeds
should occur.
EIA INTERFACE OPTION KIT (LAXX-LG)
The EIA Interface Option Kit contains the following:
Quantity

Item

Part Number

1
2

EIA Interface Assembly
Phillips Pan Head
Screws (#8-32 X
0.38 in.)
Lock Washers (#8)
Flat Washers (#8)

D-IA-7011828-0-0
9006037-1

2
2

Disconnect the 20 mA interface input cable from
J3 on the M7728 logic board.

EIA Output Signal

Out
Out

Out
In

Out

None
230 ms BREAK on Transmit
Data Line
DATA TERMINAL READY
Disconnect

NOTE
The CARRIER DETECT signal can cause a DATA
TERMINAL READY disconnect regardless of jumper
presence.
Test After Installation - Send EIA data into the DECwriter; the printout should verify a correct installation.

A Phillips screwdriver is the only tool required for
installation. Use Figure 17 and the following procedure
as installation guides.
Unplug the ac power cord.

NOTE
The EIA board is shipped with both jumpers installed.

9006690-00
9006660-00

14-KEY NUMERIC PAD OPTION KIT (LAXX-KE)
The 14-Key Numeric Pad Kit contains:
Quantity

Item

Part Number
E-IA-7411427-2-0
C-UA-LK03-A-0

4
4

Bezel
LK03A Numeric
Keyboard Assembly
Numeric Pad Cable
Standoff Spacers
Kep Nuts

Remove the two screws that hold the 20 mA
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
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.

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

C-IA-7008612-0-0
900928500
9006563-00

A Phillips screwdriver and a 11/32-in. nut driver are the
only tools required for installation. Use Figure 9 plus the
following procedure as installation guides.

1-42

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

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), and spacers (2) that
secure the keyboard bezel to the cabinet base.

Turn the keyboard upside down on a piece of
foam or bubble plastic and remove the four Kep
nuts (3) that secure the keyboard to the bezel.
Remove the four Kep nuts (9) that secure the
control panel to the bezel.

Remove all eight standoffs from the old bezel and
attach them, and the four standoffs supplied with
the kit, on the new bezel as shown in Figure 9.

Connect one end of the numeric pad cable (6) to
J 1 on the keyboard. Connect the other end to the
connector on the numeric pad (3). Ensure the red
stripe is positioned as shown in Figure 9.

Test After Installation - Apply power and place it in
local mode. The keys on the numeric pad will produce
numeric characters just as if they were typed on the
main keyboard.
COMPRESSED FONT OPTION KIT (LAXX-KJ)
The Compressed
following:

Font

Quantity

Item

Carefully replace all three assemblies (control
panel, keyboard, and numeric pad) on their
respective standoffs and secure with the Kep nuts.
Provide adequate cable clearances around all
standoffs.
CAUTION
Ensure that all insulating washers are installed
between the Kep nuts and the etch side of the
circuit boards. Failure to insert washers at required
points may cause circuit damage.

Option

30-Tooth Timing
Pulley
15-Tooth Timing
Pulley
Pulley Clamp
Timing Belt
Socket Head Cap
Screw (#10-32
X 1 in.)
Hex Socket Set
Screw (#14-20)
Kep Nuts
Right-Hand Spacer
Channel Strip

Kit

contains

the

Part Number
1212446-00
D-MD-7414908-0-0
C-MD-7414951-0-0
1211583-02
9006350-8

9007722-10
9006565-00
C-MD-7415010-0-0
9007036-00

The following tools are required for installation: socket
head wrenches, Phillips screwdriver, feeler gauges, and a
torque-type Phillips screwdriver. Use Figures 18 and 19
and the following procedure as installation guides.

The keyboard cable (5 in Figure 9) must be routed
to the inside of standoff (8) and between the bezel
and the component side of the keyboard. This
prevents possible interference between cable and
print head assembly.

Replace and secure the plastic housing. Replace
the cover and install paper.

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

CAUTION
The keyboard bezel should be positioned as far
forward (toward operator) as possible to eliminate
interference between the keyboard cable and print
head assembly.
Ensure that the spacers are placed under the bezel.
Failure to do so may result in damage to the print
head because of interference with the keyboard
connector.

1-44

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

Remove the ribbon from the print head area.

Press in against the spring as in 1, Figure 18, to
remove belt tension, then slide the timing belt (2)
off both existing pulleys (3) and (4).

Using a socket head wrench, loosen the set screw
in the pulley clamp (5) until the existing timing
pulley (3) can be removed from the motor shaft.
This pulley clamp can be discarded.

Loosen the set screw in the other pulley clamp (4),
then remove and save this pulley.

CP-2113

Figure 18 Installation of Compressed Font Option Kit
(LAXX-KJ)

1-45

less than 0.010 in. of clearance between print head
and print bar.

Assemble the cap head screw and Kep nuts, then
insert through the left side bracket as shown in
(6).

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 ha:·dware for the shaft bearing.
Secure the new 30-tooth pulley using the previously removed pulley clamp.

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

Remove the four screws (7) that secure the print
head and replace the existing timing belt with the
new belt supplied. Reassemble the print head but
do not tighten the four mounting screws.

10.

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

14.

Recheck the gap at the center. The gap should be
no greater than 0.014 in, If it is, perform steps 10
through 14 again.

15.

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

16.

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.

17.

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

NOTE
U.S.-built LA36s with serial number 02-23374 (or
Ireland-built 04-10050) 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 ..

CAUTION
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.
11.

Test After Installation - The DECwriter will 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
print head snug against the feeler (Figure 19).

PAPER OUT OPTION KIT (LAXX-KZ)
The Paper Out Option Kit contains the following:

CAUTION
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,
resulting in more than 0.01'2 in. of clearance.
12.

13.

Quantity

2
2

Tighten the #4 (6-32)' screws to 10 ± 2 in.fib of
torque.
CAUTION
Do not apply more than the recommended torque
when tightening the print head screws or the
moulded inserts in the carriage assembly may be
damaged.

Item

Part Number

Paper Out Cable
Micro Switch Assembly
Phillips Pan Head
Screws (#4-40 X
9/16 in.)
Kep Nuts (#4-40)
Flat Washers (#4)
Tie Wraps (5-% in. X
1/8 in.)

C-IA-7011657-0-0
D-M D-7412424-0-0
9008033-1

9006557
9006655
9007880

A Phillips screwdriver and a pair of needle-nose pliers are
recommended tools for installation. Use Figures 9 and
20 plus the following procedure as installation guides.
1.

Move the print head to the extreme right and left.
Using a feeler gauge, check each position for no

1-46

Unplug the ac power cord. Remove the paper.
Remove the top cover and plastic housing.

PRINT BAR

PRINT HEAD

0.012
FEELER GAUGE

6-32 SCREWS TO
BE TIGHTENED 10 ± 2
IN./LBS. OF TORQUE

CAUTION
ENSURE THAT FEELER GAUGE IS INSERTED
BETWEEN THE PROTRUSIONS ON THE
PRINTHEAD. FAILURE TO DO SO WI LL RESULT
INIMPROPERCLEARANCEANDSHORTEN
THE LIFE OF THE PRINTHEAD.
7393-06

Figu re 19

Print Head Adjustment

1-47

CP-2114

Figure 20 Installation of Paper Out Option Kit

(LAXX-KZ)

1-48

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

Using the two screws, washers, and nuts (3),
mount, but do not tighten, the PAPER OUT
switch (2) on the paper guide.
Connect the cable end (4) having the two smaller
connectors to the PAPER OUT switch as follows:
black to bottom, white to top.
Cut the first two cable ties (1) holding the
keyboard cable to the anchors.

4.
5.

Form the paper out cable along the keyboard
cable and secure both to the anchors using the
supplied cable ties.
Refer to Figure 9 and remove the four screws, lock
washers, flat washers ( 1) and spacers (2) that
secure the keyboard bezel to the cabinet base,
Turn the bezel upside down on a piece of foam.

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

Insert a piece of paper up through the paper guide.
Plug the DECwriter into an ac source and then
energize the unit.

Disconnect and remove any previously connected
data input line.

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

Secure the cover plate (3) using the two pan head
screws and associated washers ( 2). Position the
cable ( 1) as shown.

Connect the input end of the 20 mA cable
assembly to the signal source.

Test After Installation - Send data into the D ECwriter;
the printout should verify a correct installation.
20 MA (DEC 10) CABLE OPTION KIT (LAXX-LK)

Manually activate the PAPER OUT switch to
ensure proper connections. The front panel
PAPER OUT switch should illuminate and extinguish as the switch is operated. If not, recheck all
connections.

10.

The 20 mA Cable Option Kit contains the following:
Quantity

Adjust the PAPER OUT switch so that the PAPER
OUT light is extinguished when paper is correctly
installed. Remove the paper; the light should
illuminate. Continue to readjust the PAPER OUT
switch until the proper indication is achieved in
both states.

11.

1
2

Replace the housing and top cover.

Test After Installation - Check for the correct indication of the PAPER OUT display light when approximately 2 in. from the end of paper.

The 20 mA Cable Option Kit contains the following:

2
2

Part Number

Cable (2838
Connector to MateN-Lok Connector)
Cover Plate
Phillips Pan Head
Screws (#8-32 X
0.38 in.)
Flat Washers (#8)
Lock Washers (#8)

D-Al-7009212-1-0

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

9006660
9006634

A Phillips screwdriver is the only tool required for
installation. Use Figure 22 and the following procedure
as installation guides.

20 MA CABLE OPTION KIT (LAXX-LH)

Quantity

Item

Disconnect the remove any previously connected
data input line.

Item

Part Number

Cable
Cover Plate
Phillips Pan Head
Screws (#8-32 X
0.38 in.)
Flat Washers (#8)
Lock Washers (#8)

BC05F-15
C-MD-7413216-0-0
9006037-1

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

Secure the cover plate (3) using the two pan head
screws and associated washers (2). Position the
cable ( 1) as shown.

Connect the input end of the 20 mA cable
assembly to the signal source.

9006660
9006634

1-49

CP-2115

Figure 21

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

1-50

CP-2115

Figure 22

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

1-51

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.

The column scale (5) adheres to the lip on the
print window (6) as shown in Figure 23. Insert A
of Figure 23 details the placement of the scale on
the window lip.

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

After loading paper, energize and place the DECwriter in the local mode.

Type the letter "N" five times.

10.

After the Last Character Visibility (LCV) shift,
press the BACKSPACE key once.

11.

The .right-hand vertical ascender of the last "N"
typed should align over the right edge of the line
indicator as shown in insert B of Figure 23. If
necessary, loosen the two screws that secure the
line indicator to the print head and correct the
alignment.

12.

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

13.

After the LCV occurs, the red line on the column
pointer should align with the line on the column
scale that corresponds to column No. 2. If not,
open the cover and loosen the screw that secures
the column pointer to the line indicator and adjust
the position of the column pointer. Repeat steps
12 and 13 until the red line is in the proper
position.

Test After Installation - Send data into the DECwriter;
the printout should verify a correct installation.
SCALE, POINTER, AND WINDOW OPTION KIT
(LAXX-LN)
The Scale, Pointer, and Window Option Kit contains the
following items:
Quantity

Item

Part Number

Column Scale
Line Indicator
Column Pointer
Print Window
Light Shield
Phillips Pan Head
Screw (#4-40 X
3/8-in.)
Flat Washer (#4)
Lock Washer (#4)

C-IA-7414986-0-0
C-MD-7414953-0-0
C-M D-7415409-0-0
1212009-00
C-MD-7415255-0-0
9006011-1

9008172
9006632

A Phillips screwdriver is the only tool required for
installation. Use Figures 2 and 23 plus the following
procedure as installation guides.
1.

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

Install the line indicator (1) on the print head
assembly using the two front Phillips screws.
Remove the screws, insert the line indicator
beneath the ribbon (do not interfere with the
ribbon's path), then secure with the screws.

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

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

NOTE
If after installing the print window, the red and
green positioning lines on the column pointer seem
to be too high above the lip of the window,
remove the spacer from beneath the column
pointer.

NOTE
Prior to the LCV, the green line on the column
pointer aligns with the column scale to indicate
the column in which the next character will print.

1-52

COLUMN
SCALE POSITION I NG

LEFT-HAND
EDGE

PROPER
VALIGNMENT

NNNN~

LINE

~INDICATOR

C P-2117

Figure 23

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

1-53

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

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

Remove the Paper Advance knob (2, in Figure 25)
by unscrewing the #6 screw (1, in Figure 25) from
the center of the knob.

2
After removing the Paper Advance knob from the
tractor drive shaft (4, in Figure 25) remove and
discard the sleeve (5), then slide two "O" rings (3,
in Figure 25) all the way onto the shaft.

A Phillips screwdriver is the only tool required for
installation. Use Figure 24 and the following procedure
as installation guides.

Replace the knob on the tractor shaft and secure
with the screw and washers.
5.

Insert the new cover onto the DECwriter. Press the
· acoustical coupler cable down through the rear
access hole as shown in Figure 26.

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

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

Attach the wired assembly (2) to the bracket with
a #6-32 screw (3).

The cable assembly (4) should be soldered to the
wired assembly as in Figure 24.

Test After
procedure:

Connect the cable connector to J4 on the logic
board.

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

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

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

Installation - Perform

the

following

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.
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 LA36
cover and a rubber "O" ring (9009793-00) that fits over
the tractor drive shaft to minimize mechanical noise
generation during a paper advance. A Phillips screwdriver
is the only tool required for installation.

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.

1-54

ll 11

ii ii

il lj
.+----882 (BLUE)-12V
'--'"------ BD1 (VIOLE.Tl RCVD
DATA TTL

.+----BN2 (GREEN) +12V
. - - ' - - - ! - - - - BT1

(BLACK) GND

4 - - - - BV2 (YELLOW) XMTR
DATA TTL

CP- 21t8

Figure 24

Installation of DF11 Adaptor Mounting Kit
(LAXX-KH)

1-55

Figure 25 Installation of "O" Ring on Tractor
Drive Shaft

CARRIER INDICATOR

TELEPHONE
HANDSET

LOGIC BOARD

CP-2190

Figure 26 Installation of Acoustical Coupler Option Kit
(LAXX-LM)

1-56

SECTION 2
LA35 USER'S INFORMATION

LA35 GENERAL INFORMATION

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

OPTIONS
The basic LA35 DECwriter can be expanded to provide the user with a number of functional options for receiving
and handling data. These functional options are described in the following table.
LA35 Options
Option

Name

Description

LAXX-LB

Expander Option
Mount

The Expander Option Mounting Kit includes the logic, cables,
and mounting hardware required to expand the LA35 to include
options
LAXX-LA,
LAXX-KV,
LAXX-KW,
LAXX-KX,
LAXX-KY, and LAXX-PK.

LAXX-PK

APL/ASCII Dual
Character Set

This option provides an APL alternate character set for use with
the standard character set in the LA35.

LAXX-LA

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

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

LAXX-KW

Selective Addressing

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

LAXX-KX

Auto Answerback
and Auto LF Options

The Automatic Answerback Option allows the terminal to transmit a preprogrammed message of 20 characters (maximum).
The message is initiated upon receipt of the ENO control code
from another device. The LAXX-KX may be configured to
incorporate the features of the Automatic Line Feed option
(LAXX-LA).

LAXX-KY

Forms Control,
Vertical and
Horizontal Tabs

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

2-1

LA35 Options (Cont)
Option

Name

Description

LAXX-LG

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 DF11 communication options in the LA35.

LAXX-KJ

Compressed Font
Option

The Compressed Font Option is a mechanical option that
provides the LA35 with the ability to print 132 columns on a
form 8-1/2 in. (21.59 cm) wide.

LAXX-LC

TTL TO CCITT
(V28) Converter and
Modem Protector

The TTL to CCITT (V28) Converter and Modem Protector is a
BPO DATEL services interface that meets the requirements of
CCITT (V28), with BPO-required modem protection circuitry.

LAXX-LH

Current Loop Cable

20 mA current loop with Mate-N-Lok.

LAXX-LK

Current Loop Cable

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

LA XX-KG

EIA Interface

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

LAXX-LN

Scale, Pointer, and
Window Kit

Operator convenience items that assist in positioning the print
head on preprinted forms and for locating horizontal tabs.

LA35 DECwriter MODEL VARIATIONS
The LA35 variations and associated model numbers are
listed below.
LA35-CE
LA35-CF
LA35-CH
LA35-CJ
LA35-DE
LA35JDJ

detailed description of these jumper modifications and
the associated cabling required, refer to the LA35
DECwriter Maintenance Manual.

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

LA35 Parity
The LA35 is configured with no parity and no parity
error printout. To modify this configuration for odd or
even parity with or without error printout, jumpers on
the logic board must be changed. For a detailed
description of these jumper modifications, refer to the
LA35 DECwriter Maintenance Manual.

LA35 JUMPER CONFIGURATIONS
LA35 Speaker (Bell) Volume
The LA35 can be configured for a lower speaker volume
by removing a jumper. For a description of this jumper
modification, refer to the LA35 DECwriter Maintenance
Manual.

LA35 Optional Current Loop Configuration
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

2-2

LA35 SPECIFICATIONS
Printing
Switch selectable: 10, 15, or 30 characters/second
throughput

Interface
Integrated or 20 mA current loop or EIA/CCITT.
Ribbon
DIGITAL-specified nylon fabric (Part No. 36-10558)
Spool assembly: 0.5 in. (1.27 cm) wide X 40 yd
(36.58 m) long

Line Length
132 characters maximum
Spacing
10 characters/in. (horizontal)
6 lines/in. (vertical)

Power
90-132 Vac or 180-264 Vac
50 or 60 Hz ± 1 Hz
300 W maximum (printing)
160 W maximum (idle)

Characters
96 upper/lower case ASCII
7 X 7 dot matrix (0.07 X 0.10 in.) (1. 77 X 2.54 mm)

Temperature
Operating
10° to 40° C (50° to 104° F), noncondensing
Nonoperating
-40° to 66° C (-40° to 151° Fl noncondensing

Paper
Variable width: 3 to 14-7/8 in. (7.62 to 37.78 cm)
Single-Part:
15 lb paper minimum
Card stock thickness of 0.010 in. (0.25 mm)
maximum

Relative Humidity
Operating
10 to 90% with a maximum wet bulb temperature
of 28° C (82° Fl and a minimum dew point of 2°
C (36° Fl, noncondensing
Nonoperating
5to 95%

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

NOTES
Multipart forms may have only one card part. The
card must be the last part.

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

Continuous-feed, fan-fold business forms with 3or 4-prong margin crimps on both margins (multipart) are recommended. Stapled forms are not
recommended and may damage tractors and other
areas of the machine. Dot or line glue margins are
acceptable (if line is on one margin only). Do not
line glue both margins as air will not be able to
escape and poor impressions will result.

Dimensions
27.5 in. (69.85 cm) wide
33.5 in. (85.09 cm) high
21.7 in. (55.12 cm) deep
Weight
97 lb (44.09 kg)

2-3

LA35 OPERATOR'S GUIDE

7666-22

LA35 OPERATOR CONTROLS AND INDICATORS
NOTE
Dot on switch indicates function of switch when
depressed.

PAPER OUT Indicator
The PAPER OUT indicator, when illuminated, gives a
visual indication that the LA35 is out of paper. Printin g
stops when the out of paper condition is detected.

LINE/LOC Switch
The LINE/LOC switch is a 2 -position operator control
switch. When in the LINE position, the LA35 is enabled
to receive data. When in the LOCAL mode, the LA35
receive line is disabled and on ly local operation can be
performed .

POWER ON/OFF Switch
The POW 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 .
When changing paper, ribbon , or adjusting the print
head, the switch should be turned OFF .

BAUD RATE Switches
Th e BAUD RATE switches select the rate at which
characters are received over the communication line.
Switch

Character Rate

110
300
110 and
300

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

HEAD OF FORM Switch
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.

15 (characters/second)

2-4

Carriage Adjustment Lever
Th e Carriage Adjustm ent lever controls the print head
gap for si ngle-part or multi part forms .

CAR RIAGE
ADJUSTMENT
LE VE R

7666-16

Paper Advance Knob
Th e Pape r Advance knob pus hes in to dise ngage th e li ne
feed gear train, allowing fine vertical adjustment of
paper position. Coarse vertica l adjustmen t is achieved by
simply turning the knob. Each detent turned represents
one line.
PUSH IN HERE
AND TU R N TO
ADJUST PAPER
VERTICA L LY

PAPER
ADVANCE
KNOB

7595.4

2-5

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

7595-7

Bell
The bell indicates that a bell code was received .

USING THE LA35
Using the LA35 requires almost no operator intervrn tion. These few steps are all that may be required to
place the LA35 on-line.

Set the BAUD RATE switches to the applicable
baud rate.

Set the POWER switch to ON.

Load paper.

The LA35 is now on -line and fully operational .

Set the LINE/LOC switch to LINE.

2-6

LA35 INSTALLATION AND CHECKOUT GUIDE
GENERAL INSTALLATION INFORMATION
This section contains the step-by-step procedures for
unpacking and unit checkout to ensure that the unit was
not damaged during shipment and that the unit is
operating properly prior to connection to the communication system.

Install ribbon per ribbon installation procedure
(Section 3).
Install paper per paper loading procedure (Section
3).

CAUTION
Before connecting the LA35 to a power source,
ensure that the line voltage and frequency are
compatible with the power requirements of the
machine. Ensure that the POWER switch on the
console is OFF.

The LA35 DECwriter should be installed in an area that
is free of excessive dust, dirt, corrosive fumes, and
vapors. To ensure that the unit has proper ventilation
and cooling, the ventilation openings on the side of the
cabinet should not be obstructed. A minimum 4-in.
clearance between units must be maintained at all times.
Adequate service clearance must also be provided for
servicing the unit. (Refer to the figure on the following
page.)
UNPACKING AND REPACKING
Unpack the LA35 as described in Section 3. If it
becomes necessary to ship the LA35 to another site,
refer to the repacking procedure described in Section 3.
CHECKOUT AND ACCEPTANCE PROCEDURES
Perform the following procedure. If the desired results
are not achieved, refer to the troubleshooting guide in
Section 3.

2-7

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

Set the BAUD RATE switches to the applicable
baud rate.

Set the LINE/LOC switch to LINE.

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

!III

[

( 33. 5")
(851 m m)

!---------,

21.7"
( 551mm)

L_25.o"__J
(635mm)
--~~-B~~~---'
~----------,

:
I
I

SERVICE
AREA

I
I

INCHES

27.5

21.7 v* 96

MILLIMETERS

696 356 551 v* 2440

I
I

DIMENSIONS

*CURRENT LOOP CABLE (BC05F) LENGTH IS
15 FT; EtA CABLE LENGTH IS 9FT
(2744mm>

I
I

SERVICE
AREA
I
L __________ J
CP-2021

LA35 Site Considerations

2-8

CONTROLS AND INDICATORS FOR LA36 OPTIONS

•

The following options include additional co ntrols not
present on basic LA35 DECwriters .
FORMS CONTROL OPTION (LAXX-KV)
This option requires the addition of a top-of-form
control assemb ly, which is installed beneath the top
cover on the print head chassis. There are two controls on this assembly: SET TOP OF F_QRM and
FORM LENGTH (Figure 27) .

•

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 is a 12-position rotary switch
that is used to preset a form length (in inches)
into the Forms Control.

Th e column indicator is used in conj unction
with the co lumn scale. Th ere are red and green
indicator lines on the column ind icator to indi cate th e next column to be printed . Th e green
line is used before th e Last Ch a racter Vi sibility
shi ft, th e red line after the shift .

ACOUST ICAL COUPLER OPTION (LAXX-LM)
There is a single indicator associated with this option.
Thi s red indicator is mounted on the right side of
the cover and lights when the te lephone handset is
prope rly inserted in the muff assembly and a carrier
is detected by the coupler ci rcuitry.

FORMS CONTROL , VERTICAL TABULATION, AND
HORIZONTAL TABULATION OPTION (LAXX-KY)
This option also utilizes the top-of-fo rm , co ntro l
asse mbly (Figure 27).
SCALE, POINTER, AND WINDOW OPTION
(LAXX-LN)
This option contains three indicators: Column Scale,
Line Indicator, and Column Pointer as shown in
Figure 28.
7622·4

•

The column scale is a 17.25-in. long strip that
is marked off in 132 divi sions repre senting the
possible column locations. The column scale
adheres to the p lastic print window.

•

The line indicator mounts on the print head
and is used to establi sh -two printing locations.
The longer top surface indicates the baseline of
the characters in a particular line. When setting
up a form or rolling back to a previously
printed line, this top surface is used to exactly
·align where the next character will print. Th e
sma ll er surface on the right side indi cates the
position where the next character wil l print.
Thi s position is valid only after the Last Character Visibility shift. Th e line indicator is also
included in the APL/ ASCII Du a l Ch aracter Set
Option ( LAXX-PK) .

Figure 27

Forms Control A ssembly

CHARACTER
BASELINE

LINE INDICATOR

Figure 28

2-9

CP- 209 9

Lin e Indicator and Column Pointer

SETUP AND OPERATING PROCEDURES FOR LA36 OPTIONS
LA35 options requiring setup or operating instructions
in addition to those instructions given for the basic
LA35 are presented in the following paragraphs.

while the printer mechanism is positioning the
form. The best way to determine the required
number of these fill characters is to count the
number of lines from the last line printed to the
bottom of the form and insert this number of fill
characters. In character combinations when the
character buffer is empty prior to a carriage
return, 15 fill characters can be subtracted from
the above number. All fill calculations are made at
300 baud. For 150 baud, halve the values (round
off to the next higher number); for 110 baud, use
one third (round off to the next higher number).

APL OPTION (LAXX-PK)
An LA36 DECwriter containing this option can print
either the standard ASCII characters or the alternate
APL characters. Character set switching is controlled by
either a Switch In or Switch Out command. Switch In
(code 0168) selects the standard ASCII character set;
Switch Out (code 0178) selects the alternate APL set.
Figure 29 shows the bit assignments for both character
sets.

FORMS CONTROL OPTION (LAXX-KV)
Setup - (The DECwriter is assumed to be deenergized.)
Measure the form to determine its length in inches. Then
remove the top cover from the LA36 as in the paper
loading procedures. On the Forms Control panel, set the
FORM LENGTH rotary switch to the number that
corresponds, in inches, to the length of the form (Table
3). Proceed with the normal loading of the forms. When
completed, use the Paper Advance knob to align the top
line of the form with the print head. (Normally the top
line is 2 or 3 lines below the perforation, but it can be
established at any line on the form.) Close the top cover
and energize the DECwriter. The form length indicated
by the FORM LENGTH switch is automatically entered
during the power-up sequence.

Table 3
FORM LENGTH Switch Positioning

The procedure for setting up the Forms Control Option
when the DECwriter is energized is the same except that
the SET TOP 0 F FORM pushbutton has to be pressed
after the form length is selected.
Operation - The program-generated Form Feed (FF)
command is 0148. Upon receipt of a Form Feed
command, the paper will advance to the next
top-of-form line.
FORM CONTROL PROGRAMMING
NOTES

Once a form feed has begun, it cannot be aborted.
If a second Form Feed command is issued within
16 lines from the next top of form, the paper will
not stop at that next top of form, but will execute
the second Form Feed command and skip one full
form length. If the second Form Feed command is
issued with 17 or more lines remaining to the
bottom of the present form, it will be ignored.
Like- wise, more than two Form Feed commands
within one form interval will not be recognized.

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 input rate

Form Length
(inches)

FORM
LENGTH
Switch Setting

3
3.5
4
5.5
6
7
8
8.5
11
12
14

Printable Lines
Per Form (Maximum)
18
21
24
33
36
42
48
51
66
72

FORMS CONTROL, VERTICAL TABULATION, AND
HORIZONTAL TABULATION OPTION (LAXX-KY)
Setup - This option requires three setup procedures.

2-10

0
0

•

"\(b,

0
0

1
0

1
1
0

1
1
1

OLE
DC!
DC2

NUL
SOH
STX
ETX
EOT
·ENQ
ACK
BEL
BS

• • • •~
•

1
1

4
5

so
SI

FF
CR

14
15

4
5

s
t

E
F

(

7
8

w
}-:

)

z
c

··-

]

}

'!'

-·

DEL

1
1
0

1
1
1

DC3

DC4
NAK
SYN
ETB
CAN
EM
SUB
ESC
FS
GS
RS

1
1

1
0

"'$
,

*
+

;

a. Standard (ASC 11) Character Set

~
~bs

0
0
0

• • • •~
• NUL OLE

DC!

SOH
STX
ETX
EOT
ENQ
ACK
BEL
BS
HT
LF

FF
CR

4
5

14
15

1
0

1
1

1
0
0

1
0

F·

0
0

DC2

)

J..

F.<

DC3

€

.j,

)

DC4
NAK
SYN
ETB
CAN
EM
SUB
ESC
FS
GS
RS

3
4
5

c:.;

::>

'ii

(

[

;

I-

-I

. .

}

DEL

x
\

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
Forms Control Option (LAXX-KV).

Then space the print head to the next desired tab
location and store this location in the same manner.
The number of horizontal tabs that can be set is
limited by the available number of print columns on
the form. For example, a 17-in. wide form can have
up to 132 tabs. Command 011 8 will initiate a horizontal tab move. To clear all horizontal tabs, issue
codes 0338 , then 062 8 . All horizontal tabs are cancelled (cleared) during a power-up sequence.

Vertical Tabulation Setup - First perform the Forms
Control setup and, after establishing the top-of-form
position, issue Line Feed commands (012 8 ) to move
the form to the desired location of the first vertical
tab. To store this line count, issue 033 8 and 0638 .
Advance the form to the next vertical tab and store
this location in the same manner. The number of
tabs that can be set is limited by the number of
printable lines on the form used. For example, an
11-in. deep form could have up to· 66 vertical tabs.

HORIZONTAL TABULATION PROGRAMMING
NOTES

To clear all vertical tabs, issue codes 0338 and 0648 .
All tabs are cancelled (cleared) duting a power-up
sequence.

To ensure against loss of data while the printer
mechanism is executing horizontal tabs, fill characters are used to effectively slow up incoming
data. The number required is determined by
multiplying the number of spaces between tabs by
0.55 (round off to the next higher number) or 12,
whichever is greater. The 12 fill characters are
needed to compensate for the maximum carriage
return time. In instances where the tab does not
follow a 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 (round off to the next higher
number); for 110 baud, use one third (round off
to the next higher number).

If a Horizontal Tab command is received and
there are no tab locations set, the print head
will advance to column 132 and remain there
until a carriage return is received.

Once a horizontal tab has begun, it cannot be
aborted. If a second Horizontal Tab command
is issued within 16 spaces from the next horizontal tab stopping position, the head will not
stop at that next position, but will advance to
the second horizontal tab location. 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.

VERTICAL TABULATION PROGRAMMING
NOTES

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

If a Vertical Tab command (0138 ) is issued and
there are no tab locations set, the LA35 will
perform a form feed (ff) and advance the
paper to the next top-of-form location.

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

Horizontal Tabulation Setup - Before setting horizontal tabs, issue a carriage return (code 0158 ). This
ensures that the print head starts at the left margin.
Issue space characters (by code 040 8 ) until the print
head is positioned at the desired horizontal tab
location. To store this location, issue codes 033 8
then 061 8 .

AUTOMATIC LINE FEED OPTION (LAXX-LA)
The Auto Line Feed action is controlled by the
presence of jumper W1 on the auto line feed assembly circuit board. Table 4 shows the various conditions that produce the specified number of line feeds.

2-12

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

Initiating
Action

Receive CR with LF
Receive CR without LF

Out

Receive CR with LF
Receive CR without LF

Messages shorter than 20 characters can be
terminated by making the last character a NU L
(0000000). All remaining characters are disregarded. A full 20-character message does not
require a NU L at the end.

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

Table 4
Auto Line Feed Setup

Jumper W1
In or Out

NOTES
Spaces are counted as characters.

Number of
Line Feeds
Produced

2
Jumpers
0

AUTOMATIC LINE FEED PROGRAMMING
NOTES
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.

Action
Add LF to
Received CR

In
Out

N/A
N/A

Yes
No

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

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.

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
CTR L 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.

AUTOMATIC ANSWERBACK OPTION (LAXX-KX)
The Auto Answerback Option provides for up to 20
programmable character locations. This stored message
is transmitted when an ENO (005 8 ) command is
received.
The message is stored in twenty 7-bit slide switches
located on the Auto Answerback board as shown in
Figure 30. The 7-bit ASCII code for the letter "a" is
also shown. Slide switch No. 1 corresponds to b1
and the ON position corresponds to an asserted
(high) logic state.

The inherent receive-only characteristic of an LA35
establishes the terminal as a slave when connected
into a multipoint communications network. There are
three possible slave states as follows:

•

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

2-13

Broadcast Slave - A condition that allows all
terminals in the network to receive data transmitted by the master.

a.•1100001

CP-2101

Figure 30 Location of 20 Answerback Message
Characters

2-14

EXAMPLE

5=0110101
ON 7

6 5 4 3 2 1

f~~~~~~~

GROUP
ADDRESS SWITCH

UNIQUE
ADDRESS SWITCH
CP-2189

Figure 31

Location of Address Setting Switches

2-15

MASTER TERMINAL

I
•

GROUP SLAVES

BROADCAST SLAVES
(ALL 6)

(1,2,6 3)

I UNIQUE SLAVE
•

(JUST# 3)

SLAVE TERMINALS

CP- 2188

Figure 32 Typical Selective Addressing Communications
Network

•

they do not acknowledge their addresses, even though
the address is present on the communications line.
The master terminal establishes whether the slave terminals are in one mode or the other.
The fol1owing six commands are generated at the master
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 by a master, it is possible to establish
communications between these two terminals and
no other terminals in the network.

Figure 32 depicts a communications network of seven
terminals. It is assumed that terminal A is the master
and the other six are slaves, each with a unique
address; terminals 1, 2, and 3 have the same group
address while 4, 5, and 6 have a different group
address. When the master (A) transmits in broadcast,
all terminals print ~he transmission. When the master
addresses the three having the same group address,
only these three receive the transmitted 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 two. In
addition, the master can address multiple unique
addresses to form other groups (i.e., terminals 1, 3,
and 6 can be grouped to receive the same data if the
master sequentially addresses these terminals).
Slave terminals operate in either the address mode or
data mode. In the address mode, terminals respond
to character combinations that make up their broadcast, unique, or group addresses. In the data mode,

2-16

OOOs (NUL) - Used to reset all slave terminals to
their address mode. This action occurs before the
master sends addresses down the line.

0038 (ETX) - Upon receiving 0038, 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 002 8 to lock all devices into
either the selected or unselected mode.

006s (BELL) - Used to select all terminals to
receive simultaneously (broadcast mode). Until a
code 002s has been received, the BELL code does
not cause the bell on the printer to sound.

0028 (STX) - Used to "lock" all terminals in their
selected or unselected mode and to prevent an
unintentional selection during data transmission.
No terminal begins to print until 0028 is received.

Select (add-on)
To add other terminals to terminals already selected
without having to readdress all terminals, perform the
following:

005 8 (ENO) Only used with uniquely
selected slave terminals (has no effect on broadcast and group selected slaves). When a
uniquely selected slave terminal has an Auto
Answerback Option ( LAXX-KX) installed and
receives a 0058 , the stored answerback message
is sent back to the master terminal. This allows
verification that the correct slave terminal is
being addressed. The answerback message is
transmitted after the EIA interface CLEAR TO
SEND signal goes high.

Issue 003 8 .
Type new address or addresses.
Issue 002 8 .
Send message - 004 8 at the end of a message.
ACOUSTICAL COUPLER OPTION (LAXX-LM)

004 8 (EQT) - Used to reset all terminals on
the line so that none are selected.

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.

The master establishes the type of slave as follows:

Broadcast
Issue 007 8 .
Issue 0028 .
Send message - All terminals receive 0048 at
the end of a message.
Group
Type group address.
Issue 0028 .
Send message - all terminals in group receive
004 8 at the end of a message.

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.

Unique Select
Type unique address.
Issue 005 8 .
Type any character.
Issue 0028 .
Send message - Addressed terminal
004 8 at the end of a message.

receives

2-17

INSTALLATION AND CHECKOUT OF LA36 OPTION KITS
INTRODUCTION
Figure 33 contains three basic cabling diagrams for the
LA35. These diagrams depict the cabling configurations
between the M7728 logic board and the Expander
Mounting Option (LAXX-LB) for the various option kits
available. Before installing any option, it is recommended that these diagrams be consulted to ensure
proper cabling.

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

Carefully replace the logic board on top of the
grommets and secure with the six screws and
associated washers previously removed.

On the option distribution board assembly (Figure
34), remove screw (4) and loosen screw (5) on
each hinge t>racket.

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.

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

10.

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

11.

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

EXPANDER OPTION MOUNTING KIT (LAXX-LB)
The Expander Option Mounting
following:

Quantity

4
2

Item
Option Distribution
Board Assembly
Right-Hand Side Rail
Assembly
Left-Hand Side Rail
Assembly
Grommets
Interconnecting Cables
+5 Volt Power Cable

Kit contains the

Part Number
D-CS-5411668-0-1
D-MD- 7414045-0-0
D-MD-7414044-0-0
9007017-00
C-IA-BC08S-1 B
C-IA-7010001-8

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
the other end has the smooth side up. Ensure that
A connects to A at each cable end. Failure to
observe this polarity may cause a logic board
failure.

A nut driver, Phillips, and straight blade screwdrivers are
required to install the Expander Option Mounting Kit.
Use Figures 33 and 34 and the following procedures as
installation guides.
1.

Unplug the ac power cord.

Unhook all cables from the logic board.

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

Place the right and left side brackets ( 1, Figure
34), over the screw studs as shown. The hinge tabs
of the side brackets (2) should be point inward
toward each other and toward the interior of the
cabinet.

12.

Reconnect the +5V supply cable (black and red
wires) to the logic board. Connect one end of a
similar cable (supplied with this option) to the +5
and GND terminals or the power board and the
other cable end to the Faston terminals (7, Figure
34) on the option distribution board assembly.
Route the cable with existing cables to the power
board:

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

2-18

~-------

TO J1 POWER BOARD
20mA SERIAL INPUT
(IF USED)

NOT USED

~---- TO FRONT PANEL

CONTROL BOARD
EIA INPUT
(IF USED)

M7728 LOGIC BOARD

A. No options installed

TO JI POWER BOARD - - - - - .
20mA SERIAL INPUT
(IF USED)

EIA INPUT
(IF USED)

M7728 LOGIC BOARD

TO FRONT
PANEL
CONTROL
BOARD

EXPANDER MOUNTING
OPTION (LAXX-LB)

B. Any option and auta line feed or
auto answerback options not installed

TO JI POWER BOARD

EIA INPUT
(IF USED l

20 mA SERIAL INPUT
(IF USED)
M7728 LOGIC BOARD

TO FRONT
PANEL
CONTROL
BOARD

EXPANDER MOUNTING
OPTION (LAXX· LB)

C. Any option and auto line feed or
auto answerback options Installed.

CP-2191

Figure 33 Cabling Configurations for Various LA35
Options

2-19

DOOR (DECWRITER II:)
REF

CP-2104

Figure 34 Installation of Expander Mounting Kit

(LAXX-LB)

2-20

APL OPTION KIT (LAXX-PK)

Test After Installation - Install paper and apply power.
In the line mode, the DECwriter will print APL
characters when program selected.

The APL Option Kit contains the following:
Quantity

1
1
4

4
4

Item

Part Number

APL/ASCII Dual Character Set Board
Edge Connector
APL ROM
APL ROM
Phillips Pan Head
Screws (#34-40
X 0.38 in.)
Flat Washers (#4)
Lock Washers (#4)
Line Indicator

D-CS-M7732-0-1

FORMS CONTROL OPTION KIT (LAXX-KV)

The Forms Control Option Kit contains the following:
B-UA-H851-0-0
23086A6
23087A6
9006011-1

Quantity

9006655
9006688
C-MD-7414953-0-0

1
4

A Phillips screwdriver and a 11/32-in. nut driver are
required tools for installation. Use Figure 35 and the
following procedure as installation guides.

4
1
4
6
4
4

NOTE
Unplug the DECwriter and remove paper.

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

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

Using the supplied hardware (1) (four #4-40 X
0.38-in. screws and #4 washers), secure the APL
board in location Fon the expander board (Figure
35).

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

Insert the two APL ROMs: No. 23087 A6 in socket
(3) and No. 23086A6 in (4). Refer to Figure 35
for Pin No. 1 locations.

Remove the cover from the DECwriter.

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

Part Number

Top-of-Form Control
Assembly Board
Top-of-Form Module
Board
Top-of-Form Cable
Phillips Pan Head
Screws (#4-40 X 3/8 in.)
Phillips Pan Head
Screws (#6-32 X 3/8 in.)
Edge Connector
Lock Washers (#4)
Lock Washers (#6)
FlatWashers (#4)
Flat Washers (#6)

D-AD-7011503-0-0
D-CS-M 7735-0-1
D-IA-7011516-0-0
9006011-1
9006022-1
B:UA-H85·1-0-0
9006688
9007801
9006655
9006653

A Phillips screwdriver is the only tool required for
installation. Use Figure 36 and the following procedure
as installation guides.
1.

Unplug the ac power cord and open the top cover.

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

Refer to Figure 33 for the correct interface cabling
required to integrate the Forms Option into the
existing options.

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

Item

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

X 3/8-in. screw, #8 lock washer, #8 flat washer).
6.

Replace the cover.

2-21

Attach the speaker to the inside of the top-of-form
control assembly (1). Use four #6-32 X 3/8 in.
screws, #6 flat and lock washers and secure from
the inside as in (4).

c p -2105

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

2-22

FORM CONTROL
ASSEMBLY BOARD
CP-2106

Figure 36

Installation of Forms Control Option Kit
(LAXX-KV)

2-23

The top-of-form cable has two distinct ends,
differing by the length of the wire leads and type
of push-on connectors. The cable end with the
longer leads and smaller connectors connects to
the top-of-form control assembly and the other
end to the top-of-form control module board.
Connect the two push-on leads to the terminals on
the SET TOP OF FORM switch (3) and plug in the
8-pin connector as shown.

Install the top-of-form control assembly using the
previously removed #8-32 X 3/8-in. screw and #6
washers as shown in (5). Screw in from the outside
of the bracket.

Feed the cable under the printer mechanism down
through the access hole and, using the existing
cable clamps, conform the cable as shown.

FORMS CONTROL, VERTICAL TABULATION,
AND HORIZONTAL TABULATION OPTION
KIT (LAXX-KY)
The Forms Control, Vertical Tabulation and Horizontal
Tabulation Option Kit contains the Forms Control
Option Kit ( LAXX-KV) and the following:
Quantity

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 connector and board are keyed for proper fit) and the
8-pin connector (6) and two push-on connectors as
shown.

12.

1
2
6
2
4

Part Number

D-AD-7011503-0-0
Top-of-Form Control
Assembly
HT-VT-TOF Module Board D-CS-M7736-0-1
D-IA-7011516-0-0
Top of Form Cable
9006011-1
Phillips Pan Head
Screws (#4-40 X 3/8 in.)
9006022-1
Phillips Pan Head
Screws (#6-32 X 3/8 in.)
B-UA-H851-0-0
Edge Connector
Lock Washers (No. 4)
9006688
Lock Washers (No. 6)
9007801
Flat Washers (No. 4)
9006655
Flat Washers (No. 6)
9006653

A Phillips screwdriver is the only tool required for
installation. Use Figure 37 and the following procedure
as installation guides.

Replace the top cover.

Test After
procedure:

Item

Installation -

Perform

the

Un plug the ac power cord and remove the top
cover.

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

Refer to Figure 33 for the correct interface cabling
required to integrate the Forms Option into the
existing options.

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

Remove and save the bracket hardware (2) (#8-32
X 3/8-in. screw, #8 lock and flat washers).

Attach the speaker to the inside of the top-of-form
control assembly ( 1). Use four #6-32 X 3/8-in.
screws, #6 flat and lock washers and secure from
the inside as in (4).

following

Energize the DECwriter, load paper, and set the
FORM LENGTH switch to the length of the form
in inches. Press and release the SET TOP OF
FORM pushbutton.
Issue a Form Feed Command (0148). The paper
should feed and stop at a distance that is equal in
inches to the switch setting. Repeat this procedure
for two other switch settings, one longer, the other
shorter than this setting. Press the SET TOP OF
FORM pushbutton after changing the setting.
Set the FORM LENGTH switch to 3 and press the
SET TOP OF FORM pushbutton. Issue a Line
Feed command (0128) 17 times, then issue ll
Form Feed command (0148). The paper should
increment only one line.

2-24

EX PANDER OPTION
MOUNTING KIT
(LAXX-LBl

M772B
LOGIC
BOARD

TOP OF FORM
V ERTi CAL S. HORIZONTAL
TABS ASSEMBLY
BOARD
CP-2107

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

2-25

10.

11.

12.

The top-of-form cable has two distinct ends,
differing by the length of the wire teads and the
size o.f the push-on connectors. The cable end with
the longer leads and smaller connectors connects
to the top-of-form control assembly and the other
end to the HT-VT-TOF module board. Connect
the two push-on leads to the terminals on the
bottom of the SET TOP OF FORM switch (3) and
plug in the 8-pin connector as shown.

Set the FORM LENGTH switch to 3 and press the
SET TOP OF FORM pushbutton. Issue Line Feed
(0128) 17 times, then issue a Form Feed Command (0148). The paper should increment only
one line.

After ensuring correct operation of the Forms
Control function, set the TOF for 11-in. form
paper. (Set switch at 11; press pushbutton.)

Issue an "A" (1018).

Issue 0138; the DECwriter will line feed 11 in.
Issue a "B" (1028).

Issue 0128 10 times, issue 0338 and 0638 then
issue a "C" ( 103a).

Issue 0148. Issue a "D" (1048). Manually turn the
paper back until the print head aligns at the line
where "B" was printed.

Issue 0138, issue an "E" ( 1058) (wi II print next to
previously printed "C").

Install the H851 edge connector (7) in location A
(edge connector and board are keyed for proper
fit) and the 8-pin connector (6) and two push-on
connectors as shown.

10.

Issue 0138, issue an "F" (1068) (will print next to
previously printed "D").

11.

Issue 0338 and 0648, then manually turn the
paper back to the line with "B" on it.

NOTE
Only one H851 edge connector is needed.

12.

Issue 0138; the print head will align on the line
containing "D" and "F ."

Replace top cover.

13.

Issue 0128, 0158, and 0118. The print head will
move to the right margin (column 132).

14.

Issue 0158, then issue 0408 eight times.

15.

Issue 0338 and 0618, then issue an "A" (101s).

16.

Issue 0408 eight times; issue 0338 and 0618; issue
a "B" ( 1028 1.

17.

Issue 0408 eight times; issue 0338 and 0618; issue
a "C" ( 1038).

18.

Issue 031 8; issue 012 8.

19.

Issue 011s; issue a "D" ( 104al.

20.

Issue 0118; issue an "E" (105s).

Feed the cable down through the access hole and,
using the existing cable clamps, conform the cable
as shown.
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).

Test After
procedure:

Installation -

Perform

the

following

Load paper, energize the D ECwriter, and set the
FORM LENGTH 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 a Form Feed
command (0148). The paper should feed and stop
at a distance that is equal in inches to the switch
setting. Repeat this procedure for two other
switch settings, one longer, the other shorter than
this setting. Press the SET TOP OF FORM
pushbutton after changing the setting.

2-26

Issue 0118; issue a "F" ( 1068).

22.

Issue 0118; the head will move to column 132.
The printed characters will be in two lines with the
top line one character space to the right of the
second I ine.

23.

Test After Installation - Load paper and energize. With
jumper W1 not cut out, a Carriage Return command
(0158) will generate a line feed. With W1 cut out, a
Carriage Return command will not produce a line feed.

Issue 0318; issue 0118 twice, then issue 0208 ten
times.

SELECTIVE ADDRESSING OPTION KIT (LAXX-KW)
The Selective Addressing Option Kit contains the
following:

24.

lssue0118;issuea"G"(1078).

25.

Issue 0118; issue an "H" (1088). The characters
"G" and "H" will overprint on the previously
printed "E" and "F ."

26.

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

21.

Quantity

Issue 0338 and 0628; issue 0318; issue 0118. The
print head will move to column 132. The test is
completed.

Item

Part Number

Selective Addressing Board D-CS-M 7737-0-1
Edge Connector
B-UA-H851-0-0
Phillips Pan Head Nylon
9006401-04
Screws (#4-40 X 0.38 in.)
EIA Interface Cable
C-IA-7010489-0-0

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

2
3
3
3

Item

Part Number

Auto Line Feed Board
Edge Connector
Phillips Pan Head
Screws (#4-40 X 0.38 in.)
Lock Washers (#4)
Flat Washers (#4)

D-CS-M7738-0-1
B-UA-H 851-0-0
9006011-1

A Phillips screwdriver is the only tool required for
installation. Use Figure 39 and the following procedure
as installation guides.
1.

Unplug the ac power cord.

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

Refer to Figure 33 for the correct interface cabling
required to integrate the Selective Addressing
Option into the existing options.

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.

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

If the Selective Addressing Option is to be used
with the EIA Interface Option (LAXX-LG), the
interface cable (1) should be connected as shown
(lug G on the EIA board to lug GND on the
Selective Addressing board).

9006688
9006655

A Phillips screwdriver is the only tool required for
installation. Use Figure 38 and the following procedure
as installation guides.
1.

Unplug the ac power cord.

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

Refer to Figure 33 for the correct interface cabling
required to integrate the Auto Line Feed Option
into the existing options.

Using the supplied hardware ( 1) (three #4-40 X
0.38-in. screws and #4 washers), secure the Auto
Line Feed board in locations C and D on the
expander board. As shown, one of the mounting
holes should not be secured.

Test After
procedure:
1.

2-27

Installation -

Perform

the

following

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

EXPANDER
OPTION MOUNTING
(LA XX-LB)

AUTO LINE FEED
BOARD

CP-2108

Figure 38 Installation of Automatic Line Feed
Option Kit ( LAXX-LA)

2-28

EIA OPTION
(LAXX-LG)

(

M7728
LOGIC BOARD
EXPANDER
OPT ION MOUNTING
KIT (LAXX-LB)

Figure 39

Installation of Selective Addressing
Option Kit ( LAXX-KW)

2-29

OECwriter without this option. (EIA interface or
any other type of communications interface is
acceptable.)
2.

On terminal B, type any characters; A does not
receive.

14.

On terminal B, type CTR L C, then A's unique
code again. Now type CTR L B.

15.

Typing on B causes A to print.

The Auto
following:

Transmit from terminal B; terminal A does not
receive.

Quantity

On terminal B, type CTR L G, then type CTR L B.
Terminal A can receive from B.

On terminal B, type CTR L D.

Transmit from B; terminal A does not receive.

2
4
4
4

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

13.

AUTOMATIC ANSWERBACK OPTION KIT
(LAXX-KX)

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

On terminal B, type CTRL B, then A's unique
address code.

Energize both terminals; set both to line mode and
to the same baud rate.
NOTE
In the following procedure, the terminal with the
Selective Addressing Option is designated as "A"
and the terminal without the option designated

12.

Answerback

Option

Item

Kit

contains the

Part Number

Auto Answerback Board 0-CS-M 7733-0-1
B-UA-H851-0-0
Edge Connectors
Phillips Pan Head
9006011-1
Screw (#4-40 X 0.38 in.)
Lock Washers (#4)
9006688
Flat Washers (#4)
9006655

A Phillips screwdriver is the only tool required for
installation. Use Figure 40 and the following procedure
as installation guides.

On terminal B, type the group select code that was
entered into the switches on the Selective Addressing circuit board installed in terminal A.

Unplug the ac power cord.

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

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

On terminal B, type CTR L D.

Refer to Figure 33 for the correct interface cabling
required to integrate the Auto Answerback Option
into the existing options.

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

On terminal B, type A's unique select code that
was entered into the switches on the Selective
Addressing circuit board installed in terminal A.

Using the supplied hardware (1) (four #4-40 X
0.38-in. screws and associated washers), secure the
Auto Answerback board in locations C and D on
the expander board.

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

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

10.

11.

NOTE
Steps 12 through 15 set up terminal A as a
uniquely selected slave with add-on capability.

2-30

M7728
LOGIC
BOARD

CP-2110

Figure 40

Installation of Automatic Answerback
Option Kit ( LAXX-Y)

2-31

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

Test After Installation - A received ENO command
(005 8 ) will generate the answerback message.

Paper Out
Switch to Local Mode
Power-up Sequence Not Completed
Terminal Power Switched Off

EIA INTERFACE OPTION KIT (LAXX-LG)
The EIA Interface Option Kit contains the following:
Quantity

2
2
2

Item

Part Number

EIA Interface Assembly
Phillips Pan Head
Screws (#8-32 X 0.38 in.)
Lock Washers (#8)
Flat Washers (#8)

D-IA-7011828-0-0
9006037-1

EIA Output Signal

9006690-00
9006660-00

Out
Out

Out
In

Out

None
230 ms BREAK on Transmit
Data Line
DATA TERMINAL READY
Disconnect

The status of these jumpers produce the following
outputs for any of the above conditions.

A Phillips screwdriver is the only tool required for
installation. Use Figure 41 and the following procedure
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
J3 on the M7728 logic board.

NOTE
The CARRIER DETECT signal can cause a DATA
TERMINAL READY disconnect regardless of jumper
presence.

Remove the two screws that hold the 20 mA
interface cover plate to the floor of the cabinet
and remove the complete harness assembly.

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

Insert the connector end ( 1) of the E IA 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.

COMPRESSED FONT OPTION KIT (LAXX-KJ)

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

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

The Compressed
following:

Font

Quantity

Item

2
The EIA circuit board has two wire jumpers that allow
selection of the type of BREAK and DATA TERMINAL
READY signals that are output by the EIA interface.

2-32

Option

30-Tooth Timing Pulley
15-Tooth Timing Pulley
Pulley Clamp
Timing Belt
Socket Head Cap Screw
(#10-32 x 1 in.)
Hex Socket Set Screw
(#1/4-20)
Kep Nuts
Right-Hand Spacer
Channel Strip

Kit

contains

the

Part Number
1212446-00
D-MD-7414908-0-0
C-MD-7414951-0-0
1211583-02
9006350-8
9007722-10
9006565-00
C-MD-7415010-0-0
900703~-00

The following tools are required for installation: socket
head wrenches, Phillips screwdriver, feeler gauges, and a
torque-type Phillips screwdriver. Use Figures 42 and 43
and the following procedure as installation guides.
1.

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

Remove the ribbon from the print head area.

Press in against the spring as in 1, Figure 42, to
remove belt tension, then slide th'e timing belt (2)
off both existing pulleys (3) and (4).

Using a socket head wrench, loosen the set screw
in the pulley clamp (5) until the existing timing
pulley (3) can be removed from the motor shaft.
This pulley clamp can be discarded.

Loosen the set screw in the other pulley clamp (4)
then remove and save this pulley.

Assemble the cap head screw and Kep nuts, then
insert through the left side bracket as shown in
(6).

Figure 41

Installation of E IA Interface Option Kit
(LAXX-LG)

2-33

CP-2113

Figure 42 Installation of Compressed Font Option Kit
(LAXX-KJ)

2-34

PRINT BAR

PRINT HEAD

0.012
FEELER GAUGE

6-32 SCREWS TO
BE TIGHTENED 10 ± 2
IN./LBS. OF TORQUE

CAUTION
ENSURE THAT FEELER GAUGE IS INSERTED
BETWEEN THE PROTRUSIONS ON THE
PRINTHEAD. FAILURE TO DO SO WILL RESULT
IN IMPROPER CLEARANCE AND SHORTEN
THE LIFE OF THE PRINTHEAD.
7393- 06

Figure 43 Print Head Adjustment

head and replace the existing timing belt with the
new be lt suppl ied. Reassemble the print head but
do not tighten the four mounting screws.

Install the new 30-tooth t1m1ng pulley on the
ribbon drive shaft (4) . The side of the pulley with
the flange should be positioned toward the front
of the m achi ne. 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.
Secure the new 30-tooth pulley using the previously removed pul ley clamp.

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

Remove the four screws (7) that secure the print

10.

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

CAUTION
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.

2-35

CP-2115

Figure 44 Installation of 20 mA Cable Option Kit
(LAXX-LH)

2-36

11.

20 mA CABLE OPTION KIT (LAXX-LH)
The 20 mA Cable Option Kit contains the following:
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,
resulting in more than 0.012-in. of clearance.
12.

14.

Cable
Cover Plate
Phillips Pan Head Screw
#8-32 x 0.38 in.)
Flat Washers (#8)
Lock Washers (#8)

1
2
2
2

Part Number
BC05F-15
C-MD-7 413216-0-0
9006037-1
9006660
9006634

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

Tighten the #4 (6-32) screws to 10 ±2 in./lb of
torque.
CAUTION
Do not apply more than the recommended torque
when tightening the print head screws or the
moulded inserts in the carriage assembly may be
damaged.

13.

Item

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
and print bar.
Recheck the gap at the center. The gap should be
no greater than 0.014 in. If it is, perform steps 10
through 14 again.

Disconnect and remove any previously connected
data input line.

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

Secure the cover plate (3) using the two pan head
screws and associated washers (2). Position the
cable (1) as shown.

Connect the input end of the 20 mA cable
assembly to the signal source.

15.

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

16.

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.

17.

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

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

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 20 mA Cable Option Kit contains the following:

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

Quantity

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

2
2

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

Item
Cable (2838 Connector to
Mate-N-Lok Connector)
Cover Plate
Phillips Pan Head Screws
(#8-32 X 0.38 in.)
Flat Washers (#8)
Lock Washers (#8)

Part Number
D-Al-7009212-1-0
C-MD-7413216-0-0
9006037-1
9006660
9006634

A Phillips screwdriver is the only tool required for
installation. Use Figure 45 and the following procedure
as installation guides.

2-37

CP-2115

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
up through the access hole in the floor and
connect it to J3 on the M7728 logic board.

Secure the cover plate (3) using the two pan head
screws and associated washers (2). Position the
cable ( 1) as shown.

Connect the input end of the 20 mA cable
assembly to the signal source.

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

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

Test After Installation - Send data into the DECwriter;
the printout should verify a correct installation.
SCALE, POINTER,
(LAXX-LN)

AND WINDOW OPTION KIT
5.

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.

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
the window lip.

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.

The Scale, Pointer, and Window Option Kit contains the
following items:
Quantity

Item
Column Scale
Line Indicator
Column Pointer
Print Window
Light Shield
Phillips Pan Head Screw
(#4-40 X 3/8 in.)
Flat Washer (#4)
Lock Washer (#4)

Part Number
C-IA-7414986-0-0
C-MD-7 414953-0-0
C-MD-7415409-0-0
1212009-00
C-MD-7415255-0-0
9006011-1
9008172
9006632

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

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

Install the Iine indicator on the print head
assembly using the two front Phillips screws.
Remove the screws, insert the line indicator
beneath the ribbon (do not interfere with the
ribbon's path), then secure with the screws.

NOTE
After installing the column scale (5) and the
column pointer (2), a horizontal adjustment may
be required. The green indicator line on the
column pointer should align with a corresponding
line on the column scale before the last character
visibility (LCV) move takes place. If alignment is
performed after the last character visibility move,
the red line on the column pointer is used.

2-39

COLUMN
SCALE POSITIONING

LEFT-HAND
EDGE

PROPER
VALIGNMENT

NNNNJll

LINE

~INDICATOR

C P-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.

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

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.

The DF11 Adaptor Kit contains the following:
Quantity

1
1
2

Item
Adaptor Bracket
Wired Assembly
Cable Assembly
Phillips Pan Head Screws
(#2-56 X 1/4 in.)
Phillips Pan Head Screw
(#6-32 x 7/16 in.)

Part Number
C-MD-7413104-0-0
B-IA-7010599-0-0
C-1 A-7010598-0-0
9006001-01
9006023-01

NOTE
Ensure that the "O" 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.

Insert the new cover onto the D ECwriter. Press the
acoustical coupler cable down through the rear
access hole as shown in Figure 49.

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

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

Connect the cable connector to J4 on the logic
board.

Test After
procedure:

Insert the DF 11 communications option into the
connector in the wired assembly (2) and secure the
other end to the adaptor bracket using the two
small screws supplied (#2-56). The screws insert
through the hollow rivets in the DEC-CHIP handle
and secure into the adaptor bracket at (5).

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

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

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

Attach the wired assembly (2) to the bracket with
a #6-32 screw (3).

Installation -

Perform

the

following

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

Test After Installation - Refer to the checkout
procedures for the DF 11 module installed.
ACOUSTICAL COUPLER OPTION KIT (LAXX-LM)

3.
The Acoustical Coupler Option Kit contains a new cover
(D-AD-7012144-0-0) that replaces the existing LA35
cover and a rubbe.r "O" ring (9009793-00) that fits over
the tractor drive shaft to minimize mechanical noise
generation during a paper advance. A Phillips screwdriver
is the only tool required tor installation. Use Figures 48
and 49 plus the following procedure as installation
guides.

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

NOTE
Prior to removing the telephone handset from the
muff assembly, place the DECwriter in the local
mode. This action prevents the disconnect no!se
from causing printing of rand9m characters.

2-41

ll 11
i j ii
j jij
o-1----882 (8LUE)-12V
t......::+----BD1 (VIOLE.Tl RCVD
DATA TTL

H-----BN2 (GREEN)+12V
r-=--+-----BT1 (BLACK) GND
- - - - BV2 (YELLOW) XMTR
DATA TTL

Figure 47

CP-21t8

Installation of DF11 Adaptor Mounting Kit
{LAXX-KH)

2-42

CP-2184

Figure 48 Installation of "O" Ring on Tractor
Drive Shaft

CARRIER INDICATOR

TELEPHONE
HANDSET

LOGIC BOARD

CP-2190

Figure 49 Installation of Acoustical Coupler Option Kit

(LAXX-LM)

2-43

SECTION 3
COMMON INFORMATION

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

1.
2.

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 . Th e
vertical positioning adjustment enables the paper to be
adjusted vertically. Once these adjustments have been
performed, reloading paper becomes quick and simple,
requiring a minimum of interruption.

Paper Positioning
Impression Adjustment

LOADING NEW FORMS
PAPER POSITIONING PROCEDURE
1.

Set the POWER switch to OFF.

Lift the cover.

Place the tractor-feed paper on the floor between
the legs of the LA36/LA35. (The term tractor-feed
refers to the holes on either side of the paper.)
NOTE
Ensure that the leading edge of the forms is
directly below the parallel to the feed slot.

7666-14

3-1

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

7666-32

Move the Carriage Adjustment lever to the highest
number (toward operator).

CARRIAGE
ADJUSTMENT
LEVER

3-2

7666·16

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

Close the left tractor cover.

7666-JJ

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 against the
tractor pins or bow in the middle.

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

3-3

IMPRESSION ADJUSTMENT
NOTE
The Carriage Adjustment lever is normally set
forward (to notch number 1) for single thickness
paper. The following procedure is applicable only
to multi part forms.
1.

Set the POWER switch to OFF.

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

Turn the Paper Advance knob counterclockwise
while moving the Carriage Adjustment lever forward one notch at a time until the paper smudges;
then move the lever back one notch at a time until
the paper no longer smudges.

Set the POWER switch to ON and
operation.

76663

resume

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

7666-6

3-4

HORIZONTAL POSITIONING ADJUSTMENT
The horizontal positioning adjustment enables the paper
to be shifted left or right [ 1 /2 in . ( 1.27 cm) max.].
Shifting the paper provides a simple means of aligning
the type within the appropriate columns on the paper.
1.

Set the POWER switch to OFF.

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

Move the tractors the desired amount (1/2 in .
max.) to have characters type in the appropriate
columns.

THACTOR ADJUSTMENT KNOBS

7666· 10

Tighten the Tractor Adjustment knobs.
NOTE
Ensure that the paper does not pull against the
tractor pins or bow in the middle.

FINE VERTICAL POSITIONING
For fine vertical positioning , press in and tu (n the Paper
Advance Knob.

PUSH IN HERE
ANO TURN TD
ADJUST PAPER - - - - - . . ,
VERTICALLY

PAPER
ADVANCE
KNOB

7595-4

3-5

RELOADING PAPER
1.
Set the POWER switch to OFF.

Litt the cover.

Place the tractor-feed paper on the floor between
the legs of the LA36/LA35.

Open both tractor covers so that the tractor pins
are exposed .
NOTE
Ensure that the leading edge of the forms is
directly below and parallel to the feed slot.

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

Close the tractor covers.

7666-JJ

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).
After 12 hours, or when the print density becomes too light, remove both ribbon spools from th eir d rive spindl es 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 th e 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 th e old spools may be used if des ired.)
NOTE
Use only DIGITAL-recommended ribbons (Part No. 36-10558).
Use of other ribbons can cause damage and void machine
warranty.

Set th e 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.

7666-32

3-7

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

Wind 10 turns of ribbon on the empty spool.

AI VET
7666 21

762222

3-8

,,,.

_____

~CARRIAGE LEVER ADJUSTMENT

CP-2006

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

Take up the slack in the ribbon by turning the free
moving spool.

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

Return the Carriage Adjust lever to its original
setting.

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

Guide the ribbon through slot J (directior
changing guide) and around idler spool K.

NOTE
The rivet located on the ribbon must be on the
spool or"between the spool and the Direction
Changing guide.

Turn the spool clockwise until it drops into
position.

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

3-9

DECwriter INTERFACE INFORMATION

INTERFACE DESCRIPTION
NOTE
The LA35 and LA36 have identical interfaces. However,
the LA35 utilizes only the receive circuitry.
I 1
START
BIT

There are thfee interface option kits available for
the DECwriters: LAXX·LH, 20 mA Cable Option
Kit; LAXX-LK, 20 mA Cable Option Kit (DEC-10);
LAXX-LG, EIA Interface Option Kit. Refer to Sections
1 or 2 of this manual for installation instructions for
these interfaces.

8
PARITY
DATA MSB
BITS

LSB

,-J--..r±-_ _ _..___

2
STOP
BITS

----,I [TTTTTTT
I
I

110 BAUD

___,,.___,,,~.,........_.....

..L! _J!

I- 9.09ms

-j

-----66.6ms----+1•I

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

I
I
I
I

I 1
START
BIT

Transmitter (LA36 only)
Passive, isolated, goes to Mark state when power is
turned off.
Max.

Open circuit voltage
(of circuit being driven)

5.0V

40V

Voltage drop, Marking
Spacing current
Marking current

0.5V
0.4mA
20mA

2.0V
2.0mA
BOmA

1 1
STOP
BIT

150 BAUD

,-J--.r+----..__---:1,.......,n,-J--.,

----,I [- TTTTTT:·. .1-_JT"l
. _ __
I

Min.

8
PARITY
DATA MSB
BITS

LSB

I- 6.66ms

-j

- - - - 3 3 . 3 ms

----•I
I

I 1
STARTf LSB
BIT ~

Receiver
Passive, isolated

,..,.._,,

Min.
Voltage drop, Marking
Spacing current
Marking current

1.2
0.0mA
15mA

2.7 v

-j

3.0mA
BOmA

PARITY

1 I

MSB~ ~STOP
.
,,,,,,,--11-

I r

Max.

8
DATA
BITS

1
I

I
I

1
I

I- 3.33ms
cP-1177

Serial Interface Timing Diagram

Cable
4-conductor LAXX-LH or LAXX-LK
(Cable extension up to 1500 ft is permitted)
Receiver/Transmitter (LA36 only)
Active, half-duplex

Voltage drop, Marking
Spacing current
Marking current

Min.

Max.

1.7 v

4.7 v

O.OmA
15mA

3.0mA
BOmA

300 BAUD

_ BIT

3-10

PROGRAMMER'S GUIDE
LA36 PROGRAMMER'S INFORMATION

·------------,

NOTE
All information in this section is applicable to the LA35,
with the exception of keyboard operations. This is due
to the fact that the LA36 and LA35 receive operations
and baud rates are identical.

I1,
I

PRINT
HEAD

IB'
RECEIVER

INCOMING
DATA

L------------J

,-------------,
I
I

KEYBOARD

TRANSMITTING CHARACTERS AND COMMANDS
The only way an operator can transmit data is by typing
keys on the keyboard. The 7-bit ASCII equivalent of
each key is transmitted the instant a key is depressed.

OUTGOING
DATA

TRANSMITTER

L-----------.J
LA36
CP-1166

SPECIAL COMMAND KEYS

Normally, the DECwriter prints characters and processes
commands as fast as they are received. The one
exception is the RETURN operation (moving the print
head back to the left margin). RETURN can take longer
than the time interval between two successive data
inputs. This is a normal condition for mechanical
devices, which are slower than electronic signals. The
normal programming practice is to compensate for this
time lag by using filler characters (such as ASCII 000) to
take up slack time.

CTRL Key
Holding down the CTRL key changes the ASCII code
transmitted when another key is typed in that it forces
bits 6 and 7 to 0. For example, the ASCII code for the
letter "g" is 147 (1100111)

\"'-.

I bits 6 and 7
I

BUFFER

Holding down the CTRL key and typing the "G" key
transmits the ASCII code 007 (0000111)

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
33.33 ms of idle (marking) line time.

bits 6 and 7 are forced to 0
The CTRL key enables the LA36 operator to transmit
all ASCII control codes (000-037).

The nonprinting, nonspacing character requirement is
fulfilled by the line feed, (LF) code which normally will
follow CR. The LF function will be executed simultaneously with CR.

BREAK Key
The BREAK key is commonly used to manually
interrupt the flow of data coming to the LA36. The
function of the BREAK key is to cause the transmitted
data signal from the LA36 to go to the space condition
while the BREAK key is depressed. If the LAXX-LG
EIA/CCITT interface is installed, then the BREAK signal
is limited to approximately 230 ms.

Additional CR characters sent without an intervening
character that causes printing or spacing will be disregarded.
The following table lists the 7-bit ASCII codes used by
the DECwriter and indicates the operations performed
by the printer. Note that some ASCII codes, though
generated by the keyboard, are not recognized by the
printer.

RECEIVING CHARACTERS AND COMMANDS
The DECwriter receives commands as well as characters
to be printed in the form of 7-bit ASCII codes.

3-11

KEYBOARD OPERATIONS
To Transmit, Type Key(s)
ASCII Code

Character

000

NUL

001

SOH

002

STX

003

ETX

004

EQT

005

ENO

006

ACK

007

BEL

010

011

012

013

014

015

016

017

020

OLE

021

DC1

022

DC2

023

DC3

024

DC4

025

NAK

026

SYN

027

ETB

030

CAN

031

032

SUB

033

ESC

034

035

036

037

040

SHIFT*

CTRL*

v
v

v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v

RECEIVE OPERATIONS

CHAR

Character
Printed

None

Action/Description
None

c
E

None

BELL

Soun'd Alarm Bell

Backspace one position

None

Advance Paper one line

None

Move print head to left margin

None

a
R

s
T

u
v
w
x
y

z
[

-,..,,,

•

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 CTRLI that must be held down while the character key is typed.
If both keys are checked, then both keys must be held down.

3-12

RECEIVE OPERATIONS

KEYBOARD OPE RATIONS
To Transmit, Type Key(s)
ASCII Code

Character

041

042

043
044

045

046
047

050
051

(
)

052

053

SHIFT*

CTRL*

..;
..;
..;
..;
..;
..;

CHAR

Character
Printed

(

)

..;
..;
..;
..;

..;

I
0
1

5
6

054

055

Action/Description
Print character, move print head
one position to the right .

·~

056
057
060
061
062
063
064
065
066
067
070
071
072
073
074
075

I
0
1
2
3
4

..;

.
=

076

077

100

101

102

103

104

..;
..;
..;
..;
..;
..;
..;

"---

*A check in this column indicates the key (SHIFT or CTRLI that must be held down while the character key is typed.
If both keys are checked, then both keys must be held down.

3-13

•

Print character, move print head
one position to the right.

KEYBOARD OPERATIONS
To Transmit, Type Key(s)
ASCII Code

Character

SHIFT*

105

106

107

110

111

112

113

114

115
116
117
120

121
122

v'
v'
v'
v'
v'
v'
v'
v'
v'
v'
v'
v'
v'
v'
v'
v'
v'
v'
v'
v'
v'
v'

0
p

123

124
125

126
127
130
131

u
v
w
x
y

CTRL*

RECEIVE OPERATIONS

CHAR

Character
Printed

;_,

u
v

w
x

132

133

[

134

135

]

136
137

"
-

140

141

142

143

144

145

146
147

150

v'
v'

Action/Description
Print character, move print head
one position to the right.
4~

,,
Print character, move print he
one position to the right.

*A check in this column indicates the key (SH I FT or CTR L) that must be held down while the character key is typed.
If both keys are checked, then both keys must be held down.

3-14

KEYBOARD OPERATIONS
To Transmit, Type Key(s)

RECEIVE OPERATIONS

CHAR

Character
Printed

153

154

155

156

157

160

161

162

163
164

165

ASCII Code

Character

151
152

SHIFT*

CTRL*

166
167

170

u
v
w
x

171

172
173

{

174

I
I

175

176

177

DEL

v
v
v

Action/Description
Print character, move print head
one position to the right.

·~

u
v
w

DELETE

None

1r
l'rmt character, move prmt head
one position to the right.
None

*A check in this column indicates the key (SH I FT or CTRL I 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

OPERATOR CARE, PACKING, AND REPACKING
OPERATOR CARE

UNPACKING AND INSPECTION

Do not oil the DECwriter. Moving parts are
prelubricated and sealed by DIGITAL.

The following procedure outlines the steps required for
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
cleaning agents to clean the DECwriter. If excessively dirty, a mild detergent solution or
desktop cleaner may be used sparingly.

Remove the full telescope cap and then remove
the stitched tube.

Remove all shock-absorbing material and packing
from around the DECwriter (Figure 50).

Remove the poly bag from the printer.

Remove the foam key protector pad from the
keyboard.

Loosen and remove the hex head bolt securing the
wooden leg brace to the skid assembly. Remove
microfoam from around each leg of the
DECwriter.

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
switch to OFF, unplug the power cord from the
wall outlet, and carefully remove the object.
Tear paper only along perforations. Support paper
on the DECwriter cover when tearing to avoid
distorting the tractor-feed holes in the paper still
in the machine.
If unexpected trouble arises, refer to the Troubleshooting Guide in this section.

3-16

FULL
TELESCOPE
CAP

STITCHED
TUBE
----.1

POLYBAG

-----1

WOOD BRACE

HEX HEAD BOLTS
MICROFOAM

WOOD SKID

POLYBAG

TEE NUTS

CP-2187

Figure 50

D ECwriter Packaging

3-17

CABLE
TIE
7555-10

Figure 51

Cable Tie Location

Carefully inspect the DECw riter cabinet, key board, and carriage asse mbly for possi bl e sh ipping
damage. Inspect and check the enc losed packing
list for lost or missing items. Report any damage
or missing items to th e local DIG ITAL Field
Service or Sal es Office and to t he local carrier.

12.

Con nect the interface cable to the user's equipment. (See the DECwriter Interface Information .)

Rem ove th e printer from the wooden sh ipping
skid and place it in the desired location .

NOTE
Site plans are not supplied by Digital Equipment
Corporation. Interface logic connections must be
specified and provided by the system supplier, or
the customer, because each installation may be
different.

Lift t he DECwriter top cover assembly; clip an d
remove the nylon cabl e tie securing the print head
assembly (Figure 51 ). Remove the caution tag.

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

10.

Install an d adjust
DECwriter legs.

Remove the ribbon and paper.

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

Pack the DECwriter as shown in Figure 50.

11 .

t he

leveling

feet

on the

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

3-18

TROUBLESHOOTING GUIDE
Possible Cause and Corrective Action

Symptom
DECwriter does not turn on
when POWER switch is set to
ON.

Print head does not print
characters.

•

AC power cord is not plugged into wall outlet - plug
it in.

•

Current is not coming from wall outlet - check
outlet with a known working electrical device (such
as a lamp).

•

Check AC Line fuse (Figure 52).

•

If none of the above, contact your local Field Service
Office.

•
•
•

Light print

Paper does not advance

Paper tearing on multi part
forms

Line bunching

Check servo fuse - might be blown (Figure 52).
Print head may be set too far from paper - adjust the
carriage adjustment lever.
Check option interconnect cabling (Figure 8).

•

Print head may be set too far from paper - adjust the
carriage adjustment lever per impression adjustment
procedure.

•

Ribbon ink has run out - replace ribbon.

•

Reverse ribbon after 8-12 hours of continuous
printing. Ribbon should be reversed only once, then
changed.

•

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.

•

Print head is exerting pressure on paper so that paper
tears when it advances - check print head position
control. (Adjust Carriage Adjustment lever.)

•

Tension exerted on the paper by the tractors is
incorrect.

•

Tension exerted on the paper by the tractors is
excessive.

3-19

AC LINE FUSE

FUSE RATING
115 V. 3A SB
230 V . 1.5 A SB

SERVO FUSE

7622·2 1

Figure 52

Fuse Locations

3-20

Reader's Comments
LA36/LA35 USER'S GUIDE
EK-LA3635-0P-002

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

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