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EK-LA120-UG

June 1979

129 pages

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Document:	LA120 Users Guide
Order Number:	EK-LA120-UG
Revision:	000
Pages:	129
Original Filename:	http://bitsavers.org/pdf/dec/terminal/la120/EK-LA120-UG-003_LA120_Users_Guide_Jun79.pdf

OCR Text

USER GUIDE

EK-LA120-UG-003

1 st Edition, September 1978
2nd Edition, January 1979
3rd Edition, June 1979

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.
This document was set on DIGITAL's DECset8000 computerized typesetting system.

The following are trademarks of Digital Equipment Corporation, Maynard, Massachusetts:
DECSYSTEM-20 OMNIBUS
DIGITAL
DIBOL
OS/8
DEC
RSTS
VAX
PDP
RSX
UNIBUS
VMS
lAS
DECsystem-10 MASSBUS

CONTENTS

INTROD UCTION

CHAPTER 1

OPERATOR INFORMATION·

PART 1 GENERAL USER INFORMATION ................................................... 1
Operator's Console ......................................................................................... 1
Lights ................................................................................................................3
Numeric Display ..............................................................................................3
Local Control Keys .......................................................................................... 3
SET-UP Keys ...................................................................................................4
Control Character Keys .................................................................................. 5
Control Keys ....................................................................................................6
Other Keys ....................................................................................................... 6
Optional Numeric Keypad .............................................................................7
Power On/Off Switch ..................................................................................... 7
Cover I nterlock Switch ................................................................................... 7
Paper Adjust Knob ..........................................................................................8
Carriage Adjustment Lever ........................................................................... 8
Tractor Adjust Knobs ..................................................................................... 8
Alarm Indicators ............................................................................................. 9
Testing and Troubleshooting the LA 120 ................................................. 10
Operator's Troubleshooting Table ............................................................. 11
Sample LA 120 Operators' Card ................................................................ 13
PART 2 DESCRIPTION OF LA 120 FEATURES ........................................ 15
FORM SET-UP FEATURES ................................................................................. 15
Recommended Sequence for Setting Up a New Form .......................... 15
SET-UP Mode ............................................................................................... 18
Selecting Lines Per Inch .............................................................................. 19

iii

Setting Form Length .................................................................................... 20
Top of Form (TO F) ........................................................................................ 21
Top and Bottom Margins and Vertical Tabs ............................................ 22
Displaying Line Number of a Vertical Tab or Margin ............................. 22
Setting Top Vertical Margin .......................................................................23
Setting Bottom Vertical Margin ................................................................. 23
Clearing Vertical Margins ............................................................................24
Setting Single or Multiple Vertical Tabs ................................................... 24
Clearing a Single Vertical Tab ....................................................................25
Clearing all Vertical Tabs ............................................................................. 25
Characters Per Inch (Horizontal Pitch) ...................................................... 25
Horizontal Margins and Tabs ..................................................................... 27
Displaying Column Number of a Horizontal Tab or Margin .................. 27
Setting Left and Right Margins .................................................................. 28
Clearing Left and Right Margins ................................................................ 28
Setting Horizontal Tabs ...............................................................................29
Clearing a Single Horizontal Tab ............................................................... 29
Clearing all Horizontal Tabs ........................................................................ 29
OPERATOR COMFORT FEATURES .................................................................. 30
Auto Repeat ..................................................................................................30
Last Character View ..................................................................................... 31
Bell Volume ...................................................................................................31
Key Click ........................................................................................................32
COMMUNICATION FEATURES ......................................................................... 32
Line/Local. ..................................................................................................... 33
Baud Rate (Speed) .......................................................................................34
Answerback ..................................................................................................36
Transmitting or Printing the Answerback Message ............................... 36
Entering/Deleting Answerback Message ................................................. 37
Auto Answerback ......................................................................................... 37
Buffer Control ...............................................................................................38
Keyboard and Printer Character Set ......................................................... 39
Printer Character Set ................................................................................... 39
Auto Disconnect ...........................................................................................40
Local Echo .....................................................................................................41
Auto New Line at Right Margin ................................................................. 41
Auto Line Feed ............................................................................................. 42
Modem ...........................................................................................................42
Half Duplex (HDX) Initial Calling State .................................................... .43
Secondary Channel ...................................................................................... 43
Parity and Data Bits .....................................................................................44
Printer New Line Character ....................................................................... .45
XON/XO FF ....................................................................................................45
Alternate Keypad Mode ..............................................................................46
Alternate Character Set ..............................................................................47
Selecting Alternate Character Set. ............................................................ 47
Manually Selecting APL. ............................................................................. 47
Manually Deselecting APL ......................................................................... 48
Break Action .................................................................................................48

STORE, RECALL, AND STATUS FEATURES .................................................. 49
Factory Stored Settings .............................................................................. 50
Store/Reca II .................................................................................................. 51
Status ............................................................................................................. 52
Self-Test Feature .......................................................................................... 53
PART 3 RIBBONS, FORMS, AND IMPRESSIONS ................................. 54
I nstalling Ribbon .......................................................................................... 54
Print I mpression Adjustment ..................................................................... 54
Loading Paper/Forms .................................................................................. 55
Reloading Paper/Forms .............................................................................. 56
CHAPTER 2

INSTALLATION, INTERFACE, AND
SPECIFICATIONS

INSTALLATION AND CONFIGURATION ......................................................... 59
Unpacking and Inspection .......................................................................... 60
Packing Procedures ..................................................................................... 61
Voltage Selector Switch .......................................................................... 61
Checkout Procedure .................................................................................... 62
Answerback Jumper ....................................................................................62
INTERFACE INFORMATION .............................................................................. 63
EIA Interface ................................................................................................. 63
EIA Cables .....................................................................................................63
1M PEDANCE OF TERMINATOR ........................................................................ 65
Rise and Fall Times ...................................................................................... 65
Open Circuit Voltages .................................................................................. 65
LA 120 SPECIFICATIONS ...................................................................................66
CHAPTER 3

PROGRAMMER INFORMATION

GENERAL ............................................................................................................... 71
ESCAPE SEQUENCE ............................................................................................ 72
Printer Character Sets ............................................... '" ............................... 73
Opti onal Cha racter Sets .............................................................................. 74
Active Column and Active Line .................................................................. 74
Linefeed Newline Mode .............................. '" ............................................. 75
Horizontal Pitch ............................................................................................ 75
Horizontal Margins ....................................................................................... 76
H orizonta I Tabs ............................................................................................. 76
Vertical Pitch ................................................................................................. 77
Form Length ........................................................................ '" ....................... 78
Vertical Margins ...........................................................................................78
Vertical Tabs .................................................................................................78
PRODUCT IDENTIFiCATION ..............................................................................79
Alternate Keypad Mode .............................................................................. 79
Control Characters ...................... '" .............................................................. 80
APL Character Set ....................................................................................... 83
Sample Form SET-UP Using Escape Sequences .................................... 84
Synchronization ............................................................................................ 84

FILL TIME FORMULAS .......................................................................................85
Horizontal Movement .................................................................................. 85
Vertical Movement .......................................................................................86
Keyboard Operation ..................................................................................... 86
Auto Repeat ..................................................................................................86
Printable Character Keys ............................................................................ 86
Control Character Keys ............................................................................... 87
Optional Auxiliary Keypad .......................................................................... 89
CHAPTER 4

COMMUNICATIONS

FU LL DUPLEX (FOX) ............................................................................................93
Full Duplex Connection Requirements ..................................................... 93
Full Duplex Break .........................................................................................93
Full Duplex Disconnect Conditions ........................................................... 93
Restraint Mode vs Speed Control Mode .................................................. 94
HALF DUPLEX (HDX) .......................................................................................... 94
Initial Direction Determination .................................................................. 94
Reverse Channel. .......................................................................................... 95
Modem Delay ...............................................................................................95
Request to Send Delay................................................................................95
Turnaround Characters ................................................................................ 95
Half Duplex Break ........................................................................................95
Loss of Data Set Ready ...............................................................................96
Half Duplex Disconnect ..............................................................................96
MODEM SET-UP FEATURE DESCRIPTION .................................................... 96
GeneraL ..........................................................................................................96
Half Duplex....................................................................................................97
EFFECTS OF PAPER OUT ...................................................................................98
CHAPTER 5

OPTIONS

20 mA LA 12X-AL............................................................................................... 101
Installation .................................................................................................. 10 1
Test After Installation ................................................................................ 103
LA 12X-DL EXPANDED BUFFER .................................................................... 103
CHAPTER 6

SUPPLIES AND ACCESSORIES

GENERAL ............................................................................................................107
WARRANTY ........................................................................................... Back Cover

~NT~ODUCT~ON

Your LA 120 DECwriter is designed to work very much like a typewriter.
If you can type, this guide will help you learn how to use your LA 120.
The LA 120 is also easy to integrate with most systems. It is compatible
with both EIA and ANSI standards.
Besides the many standard features built into your basic LA 120
DECwriter III, there are a number of options and accessories that may be
added to your terminal to make it useful in an even wider range of
applications.

vii

Operator ~n~ormation

CHAPT[E~ ~

OP[E~ATO~ ~NFO~MAT~ON

The LA 120 DECwriter III terminal is basically a typewriter with a wide
range of features that communicates with a computer.

Part 1 of the operator's chapter is for the general user or user already
familiar with the features of a terminal.
• Description of the operator's console
• Description of alarm and bell signals
• Operator Testing and Troubleshooting.
• Summary of LA 120 DECwriter III features (Operator Reference
Card)
Part 2 is for the new LA 120 D ECwriter III user. It explains each feature
and provides a step-by-step procedure for using the feature.
The features have been grouped to help the user understand when
feature is used:

• Setting up a form
• Operator comfort
• Communication
• Store, Recall. and Status
• Self Test.

Part 3 describes how to load forms, change ribbons, and adjust the print
impression.

2 OPERATOR INFORMATION

PART 1

GENERAL USER INFORMATION

OPERATOR'S CONSOLE
The LA 120 operator's console contains an office typewriter-style keyboard. The keyboard contains a four digit numeric display and eight
indicators. There is provision for an optional. field installable numeric
keypad.

To better understand the LA 120 keyboard think of the LA 120 as two
things. First, it is an input device to a computer; that is, pressing a key sends
information (a code) to a
computer. Second, it is a
/1 PRiNTER 11"\ CODE TO BE
printer; information is sent
PRINTED
I
ILOCAL
from the computer to the
,COpy
COMPUTER
i
printing portion of the
CODE
(GENERATED
LA 120. However, you can
WHEN A KEY
IS PRESSED)
set up your system to send
information from the keyboard to the printer and
computer at the same time.

OPERATOR INFORMATION

Lights
ON LINE LOCAL

SET

T~~EARCL~~::LL

ALT CHAR
SET

0
TOF

CTS

[~:T MAR ~~T

MAR
CLEAR

DSR

SETUP PAPER OUT

STORE
STATUS RECALL

0
BAUD

ON LINE
The LA 120 is on-line. Data is transmitted and received only while on
line.
LOCAL
The LA 120 is in local mode. In local. the LA 120 operates as a typewriter
and does not transmit or receive data.
ALT CHAR SET
An optional alternate character set such as APL is in use.
CTS
Transmission of data is enabled (clear to send).
DSR
The modem is in data mode (data set ready).
SET UP
Flashes to indicate that the LA 120 is in SET-UP mode.
PAPER OUT
Flashes to indicate that the printer is not ready due to any of the
following conditions.
• Paper out
• Cover open
• Print head jam
Numeric Display
The numeric display indicates the next column number during normal
operation. In SET-U P mode the numeric display may also indicate line number, baud rate, form length, etc.
Local Control Keys

I~"I

LINE/LOCAL

Switches the LA 120 from line to local and vice versa as indicated by the
LINE and LOCAL lights.

I~'

I HERE IS

Transmits the answerback message. This key is not active in SET-UP
mode.

It~

I LOCAL FORM FEED

Performs a form feed without transmitting a code to the host computer.

4 OPERATOR INFORMATION

I~I

LOCAL LINE FEED

Advances the paper one line at a time without transmitting a code to the
host computer.

SET-UP Keys
SET-UP
Used to examine or change the LA 120 features. For a detailed
description refer to the SET-UP mode in Part 2 of this chapter. In SET-UP
mode the numeric display indicates line number. baud rate. or form length.
etc. Most keys on the keyboard perform a SET-UP command function.
SET-UP command functions for the top row of keys are briefly discussed
below'

[]J

SET TAB

Sets a horizontal tab stop at the current column. When used with SH I FT
sets a vertical tab stop at the current line.

[IJ

CLEAR TAB

Clears the horizontal tab stop at the current column. When used with
SH I FT clears the vertical tab stop at the current line.

IfJ~1

CLEAR ALL

Clears all horizontal and vertical tab stops.
[]]

TOF

Shifted or unshifted designates the current paper position as top of form.
If top of form is not the same as the top margin. the paper will move to the
top margin (first printable line).

[IJ

TOP/LEFT MAR

Sets left margin at the current column. When used with S HI FT sets top
margin at the current line.

OPERATOR INFORMATION 5

[I]

BOT/RT MAR

Sets right margin at the current column. When used with SH I FT sets
bottom margin at the current line.

[I]

MAR CLEAR

Clears left and right margins. When used with SH I FT clear.s the top and
bottom margins. Left or top margin becomes 1. Right or bottom margin
becomes the maximum allowable in the current characters per inch (pitch)
or form length.

If:i I STATUS
Prints status message containing currently selected values of SET-UP
features.
[]]

STORE/RECALL

Recalls the stored SET-UP parameters. When used with SHIFT stores
the current SET - UP parameters.

[I]

BAUD

Selects receive and transmit baud rates. When used with S HI FT selects
split transmit baud rates.
Control Character Keys

I~!> I

ESC

Generates the code for escape (Chapter 3).

TAB

Generates the code for horizontal tab.
SPACE BAR
Generates the code for space.

'_I

BACK SPACE

Generates the code for backspace.
14!.L"ffi1

DELETE

Generates the code for delete.

I ~'I

RETURN

Generates the code for carriage return or the codes for a carriage return
and line feed sequence (in auto line feed mode).
In half duplex, the return key can also generate a turnaround character
in addition to its normal code or codes. The turnaround character tells the
computer that it's the computer's turn to send data.

I~I

LINE FEED

Generates the code for line feed.

6 OPERATOR INFORMATION

I "If·~ I

ON LINE LOCAL

SETTACBLEARCLETAARBOSAll

TOiOF

ALT CHAR
SET
TLEDF?TMAR?ROTT

CTS

DSR

SETUP PAPER OUT

10 10
0
0
C~::R
STATUS ::g:L~ BAUD
~

I II~ II~I
,rriJ,
'!:'f.

IfUlI

6.[I]~rn[IJ[]][I][[][]][]].II.~El

GII.IIII ••••IIIIIIDn8

EJ~• •IIIItj]II.IIII• • G:J.

81 L~~ I• • • •II• • • • • ~~
Control Keys
CTRL Key

I~\

CTRL

When held down. modifies the function or codes generated by other
keys.

tj]
Hold CTR L down and press G to generate the code for the bell. G is also
used in SET-U P mode to change bell volume.

00
Hold CTRL down and press K to generate the code for the vertical tab.
K is also used in SET-UP mode to turn keyclick on or off.

00
Hold CTR L down and press L to generate the code for form feed. L is
also used in SET - UP mode to select auto line feed.

Other Keys

SHIFT

Functions the same as the shift key on a typewriter. When in SET-U P
mode SH I FT can also be used with other keys to select LA 120 features.

Ie \ CAPS LOCK
Causes the alphabetic keys to transmit shift (uppercase characters)
codes. regardless of the position of the SH I FT key. CAPS LOCK does not
affect numeric or other keys.
\QTiTE.\

B R EA K

Causes the LA 120 to transmit a short break signal (233 ms). When used
with SH I FT causes the LA 120 to transmit a long break disconnect signal
(3.5 seconds).

OPERATOR INFORMATION 7

VIEW

Allows the operator to view the last character printed. For additional
detail refer to the last character view feature in Part 2 of this chapter.

Optional Numeric Keypad
The numeric keypad allows numbers to be entered in adding machine
fashion. Each number key, the minus key, and the comma key normally
generate the same codes as the corresponding unshifted keys on the main
keyboard. The SH I FT key does not affect the numeric keypad.
In the alternate keypad mode, the keys generate escape sequences
which may have special meanings (Chapter 3).

These keys generate escape sequences which may have special meanings (see Programmer's chapter).

Immr·1

ENTER

ENTER normally corresponds to the RETURN key. In alternate keypad
mode E NTE R generates an escape sequence which may have a special
meaning (Chapter 3).

Power On/Off Switch
The power switch controls power application to the LA 120.

Cover Interlock Switch
This switch is a safety feature which prevents operation of the LA 120
when the cover is open.

Ul
I

COVER INTERLOCK
SWITCH (UNDER
COVER)

o
POWE R / ' ~_ _ _----I
ON/OFF
SWITCH
MA-2317

8 OPERATOR INFORMATION

Paper Adjust Knob
Advances the paper 1/12 of an inch at a time. Pressing in and turning
the paper adjust knob enables the paper to be rolled freely in either
direction and allows precise vertical forms positioning.
NOTE
This knob should only be
used when setting up the
form. To advance the paper
use LOCAL LINE FEED or
LOCAL FORM FEED

MA-2308

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

MA-2316

Tractor Adjust Knobs
The tractor adjust knobs allow fine horizontal adjustment of forms.

LEFT TRACTOR
ADJUSTING KNOB

RIGHT TRACTOR
ADJUSTING KNOB

MA-2309

OPERATOR INFORMATION

ALARM INDICATORS

The LA 120 produces several different alarm and bell signals. The
operator should become familiar with these signals to determine the correct
response.
BELL and Flashing PAPER OUT Light

These alarm indications will occur under the following conditions.

Cause

Action/Comments

PAPER OUT

Load paper (part 3 of this
chapter). Printer will resume normal
operation after paper is loaded and
cover is closed.

NOTE
When out of paper, bell will turn off after five seconds. If PAPER OUT light
continues to flash after cover is closed paper fault still exists.

Head jam

Open top cover and clear
obstruction causing head jam (see
operator's troubleshooting table).
Reload paper by aligning perforation
with print head line indicator. Close
cover.

Cover open

(Flashing light only) Close cover.

BELL Only

The bell will beep under the following conditions:

Cause

Action/Comments
Low Pitch Bell Tones

Keyboard buffer overflow

Typing faster than the communication line can handle will
cause a buffer overflow. This condition is indicated by a bell tone each
time a key is pressed. Under these
conditions data will not be lost.

I nput buffer overflow

Inputs to the LA 120 faster than
1200 baud (without XON/XOFF or
its equivalent) can cause a buffer
overflow. This condition is indicated
by a bell tone. a special symbol
printout. and loss of data.

10 OPERATOR INFORMATION

Cause

Action/Comments
High Pitch Bell Tones

Approaching right margin

()ne bell tone occurs when the
print head moves to within 10 characters of the right margin.

Bell character

Each'bell cha'racter code received
causes a bell tone.

Invalid SET-UP command

One bell tone occurs for each
invalid SET-UP command.

Incorrect entry of answerback message

Attempting to enter more than a
30 character answerback message
will cause a bell tone.

TESTING AND TROUBLESHOOTING THE LA120
The LA 120 automatically runs several internal tests and displays the
error test results in the numeric display.
Display
Indicates

o (flashing)
1 (flashing)
2 (flashing)
3 (flashing)
4 (flashing)
5 (flashing)
6 (flashing)
7 (flashing)
8 (flashing)
9 (flashing)
8888 (constant)

Causes
Error at ROM address 0
Error at ROM address 2048
Error at ROM address 4096
Error at ROM address 6144
Error at ROM address 8192
Error at ROM address 10240
Reserved for future options
RAM diagnostic failure
Microprocessor failure
Nonvolatile memory failure
Coveropen,orpaperout
indication

Corrective
Action
Call for service
Call for service
Call for service
Call for service
Call for service
Call for service
Call for service
See note 1
See notes
Close cover,
Reload paper

NOTES
1. Turn LA 120 off then back on. If an error indication reappears, record indication
and call for service.
2. If the original problem was a flashing 9, check the stored SET-UP feature to
ensure that it has not been affected. The self-test is an additional test (Part 2,
operator's chapter) which can be initiated by the operator. The test will help
determine if the problem is in the printer or in some other portion of the
communication system.

If you are unable to turn the printer on or if the printer appears to be faulty, refer to
the operator's troubleshooting table. This table describes those things an operator
can check prior to requesting service.

OPERATOR INFORMATION 11

Operator's Troubleshooting Table

Symptom

Possible
Action

Cause and

Corrective

LA 120 does not turn on
when printer power switch
set to ON

AC power cord is not plugged
into wall outlet or front of printer.
Plug in this cord.
Power is not coming from the
wall outlet Check outlet with a
known working electrical device
(such as a lamp). If no power, call
your electrician.
AC line fuse blown; turn printer
off and have the fuse replaced. (See
Part 3 for fuse location.)

Characters do not print

Printer out of paper; load paper.
(See Part 3 for paper loading.)
Printer cover open or ajar. Close
cover.
Print head too far from paper;
readjust print head adjustment lever.
(See Part 3 for adjustment)
Data set unplugged; plug it in.
Incorrect communication setup.

Light print

Print head too far from paper;
adjust print head adjustment lever.
Ribbon out of ink; turn ribbon
over or replace ribbon. (See Part 3
for ribbon replacement.)

NOTE
Turn the ribbon over after 5 to 6 hours of continuous printing. Ribbon can be
turned over only once; then it must be replaced.

Paper does not advance

Paper not loaded properly: check
that the tractor covers are closed
and the feed holes are properly
aligned.
Feed holes torn; reload paper. If
paper pulls against the tractor pins
or bows in the middle, readjust the
right tractor.

;

12 OPERATOR INFORMATION

Symptom

Possible Cause and Corrective
Action

Paper tearing on multipart
forms

Print head exerting too much
pressure on the paper; readjust the
print head adjustment lever.
Tractor incorrectly adjusted. If the
paper pulls against the tractor pins
or bows in the middle, readjust the
right tractor.
Paper not straight in printer; realign paper.

Print head jam or print head
does not move

Paper or print head jam; clear jam
and perform reloading paper/form
procedure in section 3 of this
chapter.

No keyboard or printer

Printer cover open or ajar when
printer is turned on (normally indicated by flashing 8888 and
PAPER OUT light); close cover.

Garbled or double characters.

Incorrect communication setup.
Ensure that your communication
setup is compatible with the equipment at the other end of the line.

OPERATOR INFORMATION 13

Sample LA 120 Operators' Card
The operators' card is a summary of all LA 120 features, plus the
keys used to set the features. Once you become familiar with the
operation of the LA 120, the card will be a valuable memory aid.

DECWRITER III

FORMS (CONT)
FUNCTION/COMMENTS

KEY

[ill

Horizontal pitch (Characters per inch)
NOTE: Changing horizontal pitch clears left and right margins.

LA120 OPERATOR
REFERENCE CARD

DISPLAY

PITCH

5
6
7
8
10
12
13
16

5.00 CPI
6.00 CPI
6.60 CPI
8.25 CPI
10.0 CPI
12.0 CPI
13.2 CPI
16.5 CPI

SET-UP
KEY

FUNCTION/COMMENTS

I CTRL Iand I SET-UP I Locks LA 120 in set-up mode: SET-UP light flashes

I SET-UP I
Places LA 120 in set-up mode while ISET-UP I

Vertical pitch (Lines per inch)

To exit set-up mode press

NOTE: Changing vertical pitch clears top and bottom margins.

held down: SET-UP light flashes.
To exit set-up mode release

I SET-UP I

NOTES:

LA 120 must be in set-up mode to set the following features.

Do not use I SHIFT I unless specified.

FORMS

2 LPI

3
4
6
8
12

3 LPI
4 LPI
6 LPI
8 LPI
12 LPI

OPERATOR COMFORT
FUNCTION/COMMENTS

KEY

Display current line number

I SHIFT I

Releasing

I SHIFTt- returns display to current

KEY

[ill

[I]

Set horizontal tab at current column

[I]

ISHIFT I and m

Clear vertical tab at current line

Clear all horizontal tabs

ISHIFT I and rn

1 = High Volume

[]

Key click

0= Off
1 = On

Set vertical tab at current line
Clear horizontal tab at current column

FUNCTION/COMMENTS
Bell volume

o = Low Volume

column number

I SHIFT I and

PITCH

[EJ

Auto repeat

0= Off
1 = On

Clear all vertical tabs

Last cha racter view

o = Manual
1 = Auto

@]od SHIFTI and @] Establish top of form (TOF)

[[]

Set minimum column number (left margin)

ISHIFT I and [[]

Set minimum line number (top margin)

[[J
ISHIFTI and

Set maximum column number (right margin)

ITl
ISHIFTI and

II]

Set maximum line number (bottom margin)
Clear left and right margins

ITl

Clear top and bottom margins
Form Length
NOTE: Changing form length clears top and
bottom margins and establishes TOF.
DISPLAY
th'ru} Lines per form

168

COMMUNICATION
KEY

FU NCTION/COMM ENTS
Auto answerback

0= Off
1 = On
Buffer control

o = Small
1 = Large
Printer character set

1 = United States
2 = United Kingdom
Auto disconnect

0= Off
, = On
Local echo

0= Off
, = On

14 OPERATOR INFORMATION

COMMUNICATION (CO NT)

COMMUNICATION (CONT)

KEY

FUNCTION/COMMENTS

KEY

Auto new line at right margin

FUNCTION/COMMENTS

@] (number)

Selects receive and transmit baud rates and number

0= Off
1 = On

of stop bits.

Auto line feed (Return key)

(DISPLAYED)

BAUD RATE

0= Off
1 = On
Modem

1 = FOX. No Modem
2 = FOX. Modem

3 = HDX. Supervisory
4 = HDX. EOT
5 = HDX. ETX
Keyboard and printer character set

1 = United States
2 = United Kingdom

[Q]

(letter)

Alternate character set

o = OFF
1 = ON
I SHIFT I and

Parity and data bits
DATA

2
2

Selects split baud rates

[QJ select s receive baud rate; I SH I FT I and @]

PARITY

DISPLAY

BITS

REC

XMT

1
2
3
4
5
6
7
8
9
10

7
7
7
7
7
7

IGNORE

MARK

IGNORE

SPACE

IGNORE

ODD

IGNORE

EVEN

ODD

EVEN

NONE

ODD

EVEN

8
8
8

STOP BITS
---2

50
75
110
134
150
200
300
600
1200
1800
2400
4800
7200
9600

then offers a choice of three transmit baud rates.

;

RECEIVE

TRANSMIT

BAUD RATE

TRANSMIT

(NOT DISPLAYED)

(DISPLAYED)

STOP BITS

600

75
150
600
75
150
1200

1200

2400

300
600
2400

4800

300
600
4800

H OX initial calling state

0= Transmit
1 = Receive
Secondary channel
FOX *
MODE

DISPLAY

-0--

HDX *
REV.CH.

Speed

---r::ro-

Restraint

Yes

* See M Key. Modem
Break enabled

o = No
1 = Yes

1
2

STORERECALLANDSTATUS
FUNCTION/COMMENTS

KEY
[[] (letter)

Select factory set-up parameters

[ID

Print status message

[[]
ISHIFTI and

Recall set-up parameters
[[]

Store set-up parameters

Printer new I ine character

1 = None
2 = Line feed (LF)

3 = Return (CR)
XON/XOFF

0= No

1 = Yes
Alternate keypad mode

0= No
1 = Yes

SELF TEST
FUNCTION/COMMENTS

KEY

[!]
I SHIFT I and

Initiate printing self test

Initiate non-printing self test
NOTE: Type any character in set-up mode to
stop self test.

PRINTED IN U.S.A. EK-LA120-RG-001

OPERATOR INFORMATION 15

PART 2

DESCRIPTION OF LA120 FEATURES

FORM SET-UP FEATURES

NOTE
Form settings can be automatically loaded into the
LA 120 by the computer (see
programmer's chapter).

When putting a form into a typewriter you must position the form, set
margins, set tabs, etc. Setting up your LA 120 is very similar. But. in
addition to standard typewriter settings, you can select vertical margins,
lines per inch, characters per inch, and form lengths. And these additional
selections can be permanently stored in the LA 120 for future use.
To help set up your form you will first be given a recommended SET-UP
sequence.
You will then be shown a sample form with a typical SET-UP procedure
and sample values. When setting up the sample form for the first time, you
may find it necessary to know more about each feature.
The remainder of this section should answer all your questions about a
specific feature.

Recommended Sequence for Setting Up a Form
The following sequence is recommended for setting up a form. It is a
guide showing all the steps that an operator may perform.
You do not have to use all the steps or features; however, you must follow
the order presented.
1.

Load paper and ribbon

2. Turn power switch on
3.

Enter SET-UP mode

0*
5. Enter form length ........................................................................... .
®
6. Establish the top of the form (TO F) ........................................... . ©

4. Select the number of lines per inch

7. Set top margin ................................................................................ .

8. Clear all vertical tabs
9. Set vertical tabs ...... '" ..................................................................... .

10. Set bottom margin ........................................................................ .

(£)

11. Select the number of characters per inch ................................ .

®
13. Clear all horizontal tabs
14. Set horizontal tabs ......................................................................... CD
12. Set left margin ................................................................................ .

1 5. Set right margin .... .... ......... .... ... ... ..... ........ ...... ......... .......................
16. If desired, store the above form settings
17. Exit SET-UP mode.
* Circled letters correspond to information on the following pages.

16 OPERATOR INFORMATION

Sample Form SET-UP
The best way to learn to use your LA 120 is to set up a sample form.
Simply perform the steps in the procedure column, and observe the numeric
display for the desired results. The keys used column lists the keys that
must be pressed to perform the procedure. When you are finished, your
form will have the same margins, tabs., etc., as the sample below.

C
©

TOPOFFORM
(FORM PERFORATION)

LEFT MARGIN

CD
RIGHT MARGIN
fJ'
~(COLUMN 82)

HORIZONTAL TABS

ICOLUM::~~____ ~ ______\~___~~~~j:"'''~'''''_______________________ --rV--r\
~~DmDDmnl~su'O'O"NO
Jsu.eu"e~o~"
!0
O ::~
i~~~~I~~~brl~~______________~~M~IL~L1~CE~N~T~M~IN~NO~W~~;l====~~'~4~1~1~4~'~~
1-__ @
Is""ueuswM'.".,

I ~~;~X

'reus ~~.O NO,O/

..__

-LTOPMARGIN
(LINE 4 FI RST
PRINTABLE LINf:)

J""ANTY

'0
o
'1
I
i
~:~(;~~~~·IIAVIN.
!0
~;~
o ~
!
o r
,
J:,: 0
!0
o
0
o !r'-OO-"N~G~CTR~'I-S-AL'-S"-AN~I--s"-TE-M-MO-O'-LN-O-r------~~-lr"-'EE-"[-"rO-'O-E'-"-.E~I-·A-AT-'AL~------'------TTA-OO-O-N-':,
0
r

LI N E8 --i----i--c ---

MARINE FARMS INC.
MI·.NFMSIlA ROAD

MINNOW PACKIN(; CO

MASS.

MFNIMSIIA.

00011

JAWS INOLISTRII:S
SQlIlBNOCKET LANI'

rtllLMARK. ~o~~~

PARTIAL

COMPLETE

XXX

LI NE 20 -t--rt-'u.I:'O.ilJEST......."'-----~::.:....-H..~L

o ::g,';.,

SH'PMENTS,

(R]

IMFQ MO

MOOULE

TEo.m"

:::.::.:::::.:..;--L_~~_~~~_L______--._ _----L_X_XX_X_X_ _ _+-___+-___I--I__-4i: 0

If:::

I ALLOWEO

I EXEMPTtONNO

() l~a~u.~NT_'~~~_+------------~--~------------~--------_+--------+_---i:" ()

LINE 25 - - 1 - - ' - - 1000'"
50

VERTICAL
TABS

RESISTOR 73684
LABEL MAKlRS

XXX
XXX

METAL
METALTABIIOLDERS
MI'TAlTABCRATrS

IX X X

~
o
o ®';: f"":m'T' "w
o
~(AT
o
100
~5

XXX

:i:

IN'S

-W- ;___

I--_______-'--____--'-___ o

....l-__--L-_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

SET 2 OPEN FILE

BOTTOM
MARGIN:
LINE 58

o
o

fG\10 CHARACTERS PER INCH
10 CPI WITH AN 8
INCH WIDE PRINTING AREA,
LINE LENGTH WILL BE
80 CHARACTERS)

XXX

PE~ INC~

LINE 45

FORM LENGTH (66) =
LENGTH OF FORM IN
INCHES (11") X LINES
PER INCH (6)

SET 3 CIitIOIT

lOGIC CUlT. INVOICI!

o
-I-;...,-f------------------------_
o:
I

PRELIM. 'filOOUCTION CONTIitOL

FOR FURTHER INFORMATION
CONTACT:
SELArtlll GILLIS

602-602-1000

: ,'

i0
I

)

____ L ____________________________________________________________________________________ L ____ I __ L /

~~-------------------.
y ~-------------------)
FORM WIDTH:

8Y, INCHES

OPERATOR INFORMATION 17

Procedure
1. Enter SET-UP

2. Select 6 lines per

0
0
0
0

inch ................. ··· .... ···.· .....
3. Enter form length;

66 lines ...........................
4. Establish top of form at

form perforation ............
NOTES
1.
I n steps 5 through 12
use LOCAL LI N E FEE D to
advance to desired line.
2.
Press SHIFT to display
current line number.

Keys Used

Numeric Display

CTRL and
SET-UP

Indicates column
number

[!]

[I]

66
Indicates column

[]]

4 *

SHIFT andl~l

4 *

SHI FT and[]]

8 *

SHIFT and[]]

20 *

SHIFT andOJ

25 *

SHIFT andOJ

45 *

SHIFT and[]]

58 *

per inch ...........................

13. Set left margin at
column 3 ........................

[]J

Indicates column
number

5. Set top margin at

line 4 ...............................
6. Clear vertical tabs
7. Set vertical tabs at

Iine8·······························0
8. Set vertical tabs at

line20 ............................. 0
9. Set vertical tabs at

Iine25·····························0

SHIFT andl ~

10. Set vertical tabs at

line45·····························0
11. Set bottom margin at
line 58 .............................
12. Select 10 characters

0
0
0

14. Clear horizontal tabs
15. Set horizontal tabs at

column 10 .................... (~)

16. Set horizontal tabs at

0
0

column 21 .....................
17. Set horizontal tabs at

column 41 .....................
NOTE
Select your operator comfort features and communication features prior to
storing your form settings.

18. Set right margin

at82·······························0
19. If desired, store SET-UP
features

[]]
SHIFTandl~1

82
(Display goes blank
for a few seconds)

This will enable you to store
all your features at the same
time.

* Press SH I FT

to obtain correct numeric display indication.

18 OPERATOR INFORMATION

SET-UP Mode
LA 120 features can be changed only while in SET-UP mode. Normally
four steps are required to perform a SET-U P.
1.

Enter SET-UP mode

Change a feature such as tabs. baud rate. etc.

Store the feature if desired (see note)

Exit SET-UP mode.

SET -UP mode may be entered while on-line or in local. But. to prevent
loss of data. you should enter SET -U P mode only when your system is not
sending data. or if it uses XON/XOFF or the restraint signal.
The following procedure describes the two methods of entering and
exiting SET-UP mode.

Indication/Comments

Procedure

Method 1
Press and hold CTRL. Then
press SET-UP and release
both keys. You now change
any SET-U P feature.

SET -U P light flashes to indicate
you have entered SET-UP mode.

Press SET-UP to exit
SET-UP mode.

SET-UP light stops flashing.

Method 2
Press and hold SET-UP. You
must continue to hold the
SET-UP key while changing
any feature.

SET -U P light flashes to indicate
you are in SET-UP mode.

Release SET-UP to exit
SET-UP mode.

SET -U P light stops flashing.

NOTE
Storing enables the selected
feature to be permanently
stored. For detailed information refer to the Store. Recall, and Status description
in this chapter.

OPERATOR INFORMATION 19

Selecting Lines Per Inch

NOTE
Changing lines per inch
clears top and bottom
margins.

The LA 120 offers six different vertical pitch (lines per inch) selections.
This feature enables your LA 120 to be tailored to accept a large variety of
preprinted forms. You can also use these settings to print super and
subscripts. To do this select 12 lines per inch, then doublespace all lines
except those requiring super or subscripts.
To select lines per inch, count the printed lines per inch on your form.
Then set the LA 120 to the corresponding number.

MA-2314

! 11:1:$7.&'

, 1:1:$7.&'
It$7.&"(

! 11:1:$7.&'

11$1.&' (
1:1:$7.&'(

t$i.:&'()

I$i.:&'()
$y'&'()*

! 11$7.&'

'11$7.&'
1:1:$7.&' (
t$7.&"()
$y'&"()*

1:1:$7.&'(
t$7.&"()
$i.:&"()*
%&'()*+
&'()*+,

'liP'

I'{!!H
*i!:6£~

I.&'()*+

&'()*+,
"()*+,-()*+,-.

.. 1

Procedure

Indication/Comments

Enter SET-UP mode

SET-UP light flashes to indicate
you are in SET-UP mode.

Press

G
0

Numeric display indicates current
line per inch selection.
again to change

selection

Numeric
Display
2

2
3
4

6
8

Exit SET-UP mode

Lines
per inch

SET-UP light stops flashing.

.:..

20 OPERATOR INFORMATION

Setting Form Length
The LA 120 measures form length in lines per form. To determine how
long your form is. measure the length of form in inches. then multiply the
length of form by the lines per inch you have previously selected.
Form length = Length of form in inches x selected number of lines per
inch.
Perform the following procedure to enter the number of lines per form.
Your choices of form length range from 1 to 168 lines.

Form
Length

Lines per Inch Selected

(Inches)

3
3.5
4
5.5
6
7
8
8.5
11
12
14

6
7
8
11
12
14
16
17
22
24
28

3
9
12
**
18
21
24
**
33
36
42

12
14
16
22
24
28
32
34
44
48
56

18
21
24
33
36
42
48
51
66*
72
84

24
28
32
44
48
56
64
68
88
96
112

36
42
48
66
72
84
96
102
132
144
168

* 11 inch form at 6 lines per inch = 66 line form length.
* * Not recommended.

Procedure

Indication/Comments

Enter SET-U P mode

SET -U P light flashes to indicate
that you are in SET -U P mode.

Press

Continue to press
change form length

Exit SET-UP mode

Current form length in lines indicated by numeric display.
to

Nu meric display indicates a new
value each time 8] is pressed. Stop
when desired number of lines is
displayed.
SET -U P light stops flashing.

NOTE
Changing form length clears
top and bottom margins and
sets the current line number
to 1.

OPERATOR INFORMATION 21

Top of Form (TOF)
Since the LA 120 has no way of knowing where your form starts you
must establish the top of the form (TOF). Top of form should be set for all
new forms or when changing existing forms.
NOTE
Since the LA 120 does not
remember the top of form

FORM
PERFORATION

when power is turned off,
you can avoid performing
the TOF procedure by pressing the local form feed key
prior to turning the LA 120
off

TOP OF

"'"

-~~::~~---LINE
INDICATOR

MA-2298

Procedure

Indication/Com ments

Enter SET-U P mode

SET - UP light flashes to indicate
you are in SET,.UP mode.

Use the paper adjust knob to
set the form perforation halfway between the line indicator and the top of print
head.

Form perforation is lined up with
print head.

Press SH I FT and

r"t']

Exit SET-UP mode

Top of form is established. Numeric
display indicates line number. If top
margin is not line 1, paper moves to
top margin.

SET -U P light stops flashing.

22 OPERATOR INFORMATION

Top and Bottom Margins and Vertical Tabs
SHIFT, TOP/MAR, and BOT/MAR are used to establish or change the
top and bottom vertical margins. The top margin specifies the first printable
line on the form.
SHIFT and SET TAB or CLR TAB are used to set and clear vertical
tabs. CTRL and
are used to advance the form to the vertical tab stop.
Tabs can be set or cleared at any time; however, when setting up a new
form set tabs after setting the first margin.

[j[\

Displaying Line Number of a Vertical Tab or Margin
Procedure

Indication/Comments

Enter SET-UP mode

SET -U P light flashes to indicate
you are in SET-UP mode.

To read top margin press
LOCAL FORM FEED

With SH I FT held down numeric
display indicates top margin.

To read tab press and hold
CTR L and press ~

Form advances to vertical tab stop.
With SHIFT held down numeric display will indicate line number of tab
stop.

I I

Repeat above step for each
additional tab stop.

To read bottom margin press
and hold SHIFT and repeatedly press LINE FEED
while observing numeric display.

Highest line number displayed
before skipping to the next form is
the bottom margin.

Exit SET-UP mode

SET-UP lamp stops flashing.

OPERATOR INFORMATION

BOTTOM
MARGIN
(LAST PRINTABLE
LINE)

MA-2301

Setting Top Vertical Margin
Procedure

Indication/Com ments

Enter SET-UP mode

SET-U P light flashes to indicate
you are in SET-U P mode.

Press and hold S HI FT and

Old vertical margins are cleared.

press

!~ I

Use LOCAL LINE FEED to
advance paper to the desired
location of the top margin. If
necessary use the paper
knob for aligning the form.

Press and hold S HI FT and
press

!~ I

Exit SET-UP mode

Top margin is set at the current line.
With SH I FT held down. numeric
display indicates line number of
margin.
SET-UP light stops flashing.

Setting Bottom Vertical Margin
Procedure

I ndication/Com ments

Enter SET-UP mode.

SET -U P light flashes to indicate
you are in SET-UP mode.

LOCAL LINE FEED advances the paper to the desired location of the bottom
margin.
Press and hold SHIFT and
press

I@I

Exit SET-UP mode

Bottom margin is set. With SH 1FT
held down numeric display indicates
line number of margin.
SET -U P light stops flashing.

24 OPERATOR INFORMATION

Clearing Vertical Margins
Procedure

Indication/Comments

Enter SET-UP mode

SET -U P light flashes to indicate
you are in SET -U P mode.

Press and hold SHIFT and
press

Top and bottom vertical margins are
cleared.

Exit SET-UP mode

SET -U P light stops flashing.

LINE
r-., ..~~~~~- REQUI RING

MA·2303

Setting Single or Multiple Vertical Tabs
Procedure

Indication/Comments

Enter SET-U P mode

SET - UP light flashes to indicate
you are in SET-UP mode.

LOCAL LINE FEED advances the form to the line
requiring a tab.
Press and hold SH I FT and
press

Tab is set. Numeric display indicates
line number of tab.

Repeat the above two steps
for each additional tab.

Exit SET-UP mode

SET -U P light stops flashing.

OPERATOR INFORMATION 25

Clearing a Single Vertical Tab
Procedure

Indication/Comments

Enter SET-UP mode

SET-UP light flashes to indicate
you are in SET-UP mode.

Press and hold CTA Land
press G:~-1

Form advances to vertical tab stop.
With SI-! I FT held down, numeric
display indicates line number of tab
stop.

Press and hold Sl-II FT and
press r"p--J

The vertical tab is cleared.

Exit SET-UP mode

SET -U P light stops flashing.

Clearing all Vertical Tabs
Procedure

Indication/Comments

Enter SET-UP mode

SET - UP light flashes to indicate
you are in SET -U P mode.

Press and hold S HI FT and
press [-i~~J

Vertical tabs are cleared.

Exit SET-UP mode

SET -U P light stops flashing.

Characters per Inch (Horizontal Pitch)
NOTE

TH E LA 120 offers eight different character per inch selections.

Changing characters per
inch clears left and right
margins.

Characters
Per Inch

16.5
13.2
12.0
10.0
8.25
6.6
6.0

5.0

Example

0123456789AaBbCcDdEeFfG~HhliJjKkLlM.NnOoPpGaRrSsTtUuVvWwXxY~Zz
0123456789AaBbCcDdEeFfG~HhIiJJKkLIMmNnOoppaGRrSsTtUuV

0123456789AaBbCcDdEeFfG~HhIiJJKkLIM~NnOoPpQGRrSs
0123456789AaBbCcDdEeFfG~HhliJJKkLlMmNnOo
01234S6789AaBbCcDdEeF~G~HhliJJKkL

0123456789AaBbCcDdEeF~G~Hh

01234S6789AaBbCcDdEeF~G~

0123456789AaBbCcDdEe

This feature saves paper and prints a full 132 columns on 8-112 x 11
inch paper that can conveniently be bound into a looseleaf notebook and
stored in a standard file cabinet.
The following table lists the number of characters that can be printed on
the most commonly used forms.

26 OPERATOR INFORMATION

Typical
Form
Width*
(inches) 5

6.6

8.25

13.2

16.5

6
7
8
10
11
13.2

36
42
48
60
66
79

39
46
52
66
72
87

49
57
66
82
90
108

72
60
70
84
80* * 96
100
120
110
132
132
158

79
92
105
132
145
174

99
115
132
165
181
217

30
35
40
50
55
66

Characters per Inch

* Form

widths listed represent the usable printing area on the
most commonly used forms.
* * At 10 characters per inch. 80 characters can be printed on an 8-1/2
inch wide form with 114 inch margins.
Procedure

Indication/Comments

Enter SET-UP mode

SET -U P light flashes to indicate
you are in SET-UP mode.

0
Press 0 again to change
Press

selection

Current character per inch selection
appears in numeric display.
Numeric
Display
Indicates
5
6
7

8
10
12
13
16
Exit SET-UP mode

Characters
Per Inch

5
6
6.6
8.25
10
12
13.2
16.2

Numeric display indicates current
characters per inch selection. The
SET-UP light stops flashing.

NOTE
If preprinted forms are used,
ensure that characters print
within the columns.

OPERATOR INFORMATION 27

Horizontal Margins and Tabs
LEFT MAR and RT MAR are used to change the left and right horizontal
margins. The left margin specifies the first printable column, the right
margin specifies the last printable column.
SET TAB and CLR TAB are used to set and clear horizontal tab. Tabs
on the LA 120 work similar to tabs on a typewriter. When a horizontal tab
code is received the print head advances to the next horizontal tab stop. If
the tab stop is column 9, printing starts in column 9.

Displaying Column Number of a Horizontal Tab or Margin

Procedure

Indication/Comments

Enter SET-U P mode

SET -U P light flashes to indicate
you are in SET-UP mode.

To read left margin number
press R ETU RN key

Numeric display indicates column
numbers of left margin.

To read tab press TAB

Print head advances to horizontal
tab and numeric display indicates
column number of tab.

Repeat above step for each
additional tab stop.
To read right margin, repeatedly press TAB while
observing numeric display.

Highest column number displayed is
one column greater than right
margin.
Example: If highest number displayed is 133, right margin is at
column 132.

Exit SET-UP mode

SET -U P light stops flashing.

28 OPERATOR INFORMATION

Setting Left and Right Margins
Procedure

Indication/Comments

Enter SET-UP mode

SET -U P light flashes to indicate
you are in SET -U P mode.

Press

I~ I
!/

To select the left margin
position the print head in the
desired column as indicated
by the numeric display

Press

I ,~ I

Left and right margins are cleared.

LEFT
MARGIN

RIGHT
MARGIN

Left margin is set. Numeric display
indicates column number of margin.

To select right margin position the print head in desired
column as indicated by numeric display.
Press

[iJ

Exit SET-UP mode

Right margin is set. Numeric display
indicates column number of margin.
SET - UP light stops flashing.

NOTE
If desired, perform the tab setting procedure prior to setting the right margin.

Clearing Left and Right Margins
Procedure

,Indication/Comments

Enter SET-UP mode

SET -U Plight flashes to indicate you
are in SET-UP mode.

Press 'I ~ I

Left and right margins are cleared.

Exit SET-UP mode

SET -U P light stops flashing.

OPERATOR INFORMATION 29

Setting Horizontal Tabs
Procedure

Indication/Comments

Enter SET-UP mode

S [:7 -UP light flashes to indicate
you are in SET-UP mode.

If desired clear horizontal

tabs.

TAB
SETTING

Move the print head to the
desired tab location as indicated by the numeric display.

Press [ ;, -]

Tab is set. Numeric display indicates
column number of tab.

For each additional. tab
move the print head to the
desired tab location and repeat the above step.
Exit SET-U P mode

S[:T-UP light stops flashing.

Clearing a Single Horizontal Tab
Procedure

I ndication/CorTun~ents

Enter SET - UP mode

SET-UP light flashes to indicate
you are in SET-UP mode.

Press TAB to move print
head to the desired tab location.

Print head advances to the horizontal tab; numeric display indicates
column number of tab.

Press

[f]

Exit SET-UP mode

Horizontal tab is cleared.
SET -U P light stops flashing.

Clearing all Horizontal Tabs
Procedure

Indication/Comments

Enter SET-UP mode

SET-UP light flashes to indicate you
are in SET-UP mode.

Press r:::~

Exit SET-U P mode

All horizontal tabs are cleared.
SET-UP light stops flashing.

30 OPERATOR INFORMATION

OPERATOR COMFORT FEATURES
The LA 120 contains a number of features designed for operator comfort.
• Auto Repeat-A character is repeated for as long as the key is held
down.
• Last Character View-print head moves enabling the last character
typed to be seen.
• Bell Volume
• Key Click

Auto Repeat
Auto repeat allows a key to be automatically repeated at the rate of 7.5
characters per second. gradually increasing to 25 characters per second
when the key is held down for more than one-half second. Auto repeat
affects all printable character keys plus space. backspace. line feed. and
delete keys. Auto repeat may be turned totally on or off by using the
following procedure.

Procedure

Indication/Comments

Enter SET-UP mode

SET-UP light flashes to indicate
you are in SET-UP mode.

PressG

Current selection of auto repeat
appears in numeric display.

PressG again to change
selection

Numeric display indicates either:

o = repeat off

1 = auto repeat on.

Exit SET-UP mode

SET -U P light stops flashing.

NOTE
LOCAL LINE FEED a/ways auto repeats.

OPERATOR INFORMATION 31

Last Character View
Last character view (LCV) enables the operator to view the last character
typed. When typing pauses, the print head moves to the right for a clear
view of the last character, then moves back automatically to print. When
LCV is not selected the VI EW key can be used to view the last character
typed. To select LCV perform the following procedure.
Procedure

Indication/Comments

Enter SET-U P mode

SET-UP light flashes to indicate
you are in SET-UP mode.

I
Press/ & I again to change
Pressl1j

Current LCV selection appears in
numeric display.

selection

Numeric display indicates either:
o = manual
1 = automatic

Exit SET-UP mode

SET -U P light stops flashing.

Bell Volume
Perform the following procedure to lower or increase the volume of the
LA 120 bell.
Procedure

Indication/Comments

Enter SET-UP mode

SET -UP light flashes to indicate
you are in SET-UP mode

Press \,;-@ul

Current selection of bell volume
appears in numeric display.

Presslr:l@fl again to change
selection

Numeric display indicates either:
o = low volume
1 = high volume.

Exit SET-UP mode

SET -U P light stops flashing.

32 OPERATOR INFORMATION

Key Click
The LA 120 has a silent keyboard for low-noise environments. But if a
keyclick is desired or if you wish to turn the keyclick off, perform the
following procedure.
Procedure
Enter SET-U P mode
Press

Ii~' ]
I I

Press ~~' again to change
selection

Indication/Com ments

NOTE

SET -U P light flashes to indicate
you are in SET -U P mode.

The bell volume feature also
changes the volume of the
keyclick.

Current selection of keyclick
appears in numeric display.
Numeric display indicates either:

o = key click off

1 = key click on.

Exit SET-UP mode

SET -U P light stops flashing.

COMMUNICATION FEATURES
To send and receive data the LA 120 must be compatible with the
equipment and program at the other end. Therefore, communication
features are normally preselected and should not be changed unless
compatibility is verified. For a more detailed explanation refer to the
programmer's and communication sections.

The following features are described in detail and can be selected to
match your system requirements.
• Line/Local

• Auto line feed

• Answerback

• Modem

• Auto answerback

• Half duplex (HDX) initial
calling state

• Buffer control
• Keyboard and printer
character set

• Secondary channel
• Parity and data bits

• Printer character set

• Printer new line character

• Auto disconnect

• XON/XOFF

• Local echo

• Alternate keypad mode

• Auto new line at right
margin

• Alternate character set
• Break action

OPERATOR INFORMATION 33

0~:
"JQ.~
~~_,,~.~.,
...,~."~...•..~.,,,.~/
"~~-~~'
,

(~\-::-,
\

...

-----~~
\"~:/
~EQUIPMENT
';.

SETTINGS MUST
BE COMPATIBLE
TO COMMUNICATE
MA-2297

Line/Local
When on-line the LA 120 is able to communicate with your system.
When in LOCAL the only communication is between the keyboard and
the printer portion of the LA 120.
PRINTER

COMPUTER

O~ LINE

PRINTER

LOCAL
COpy

COMPUTER

LOCAL

MA3379

Procedure

Indication/Comments

Observe ON LINE and
LOCAL lights

ON LINE or LOCAL light is on.

Press LINE/LOCAL
change selection

One light goes off; the other goes
on.

34 OPERATOR INFORMATION

Baud Rate (Speed)
Baud rate is the speed at which data moves to and from your LA 120.
And because you must communicate with many systems. a large selection
of baud rates are available.

In some systems transmit and receive speeds are different. This is known
as the split baud rate. To set the baud rate for your LA 120 perform the
following.
Procedure

Indication/Com ments

Enter SET-U P mode

SET -U P light flashes to indicate
you are in SET-UP mode.

Press\ (g) I

Numeric display indicates baud rate.

nil

Press L2J again to change
transmit and receive baud
rate

Baud
Rate
( Displayed)
50
75
110
134
150
200
300
600
1200
1800
2400
4800
7200
9600

Exit SET-UP mode

Actual
Baud
Rate
50
75
110
134.5
150
200
300
600
1200
1800
2400
4800
7200
9600

SET-UP light stops flashing.

Stop
Bits
2
2
2
1
1
1
1
1
1
1
1
1
1
1

OPERATOR INFORMATION 35

To set the split baud rate for your LA 120 perform the following.
Procedure

Indication/Comments

Enter SET-UP mode

SET-UP light flashes to indicate
you are in SET-UP mode.

Press [f~ until a receive
baud rate of 600, 1200,
2400, or 4800 is displayed.

Numeric display indicates receive
baud rate.

Press and hold SH I FT and
press [-(~\-l to display trans-

With SH I FT held down, numeric
display indicates transmit baud rate.

mit baud rate.
Press and hold SH I FT and
press
to change transmit baud rate.

G{]

Split Baud Rate Selections
Receive
Transmit
Baud Rate
Baud Rate
Stop
(Not
(Displayed)
Bits
Displayed)

600

75
150
600

1200

75
150
1200

2400

4800

Exit SET-UP mode

300
600
2400
300
600
4800

SET-U P light stops flashing.

1
2
1
1

1
1
1

36 OPERATOR INFORMATION

Answerback
Answerback is a short message of up to 30 characters entered into the
LA 120 by the operator. The message is transmitted from the LA 120 after
receiving a command from another device or when the operator initiates the
answerback message from the keyboard. The message usually consists of
a code that identifies the LA 120. This feature is also a means of
automatically logging onto a system.
Control codes such as carriage return, line feed, tab, etc" may be part of
the answerback message. If a control code is entered one of the following
unique characters will be printed.
A jumper internal to the LA 120 provides a permanent answerback
message that cannot be changed by the operator. The jumper may be
removed by the installer after entering and testing the answerback
message. See Chapter 2 for additional information.

MA·2295

Transmitting or Printing the Answerback Message
Procedure

Indication/Comments

Press HERE IS

LA 1 20 transmits the answerback
message if on-line. Message prints
out if the computer echoes the
message or if local echo is selected.
Message prints out if in local.

NOTE
The LA 120 does not respond if H ERE IS is pressed while in SET-UP mode.

NOTE
If the answerback jumper is
removed the answerback
message cannot be altered
or erased.

OPERATOR INFORMATION 37

Entering/Deleting Answerback Message
Procedure

Indication/Comments

Press and hold CTR L
Then press SET-UP

SET -U P light flashes to indicate
you are in SET-UP mode.

Press and hold CTRL. Then
press HER E I S and release
both keys.

Next character typed
answerback.

starts the

NOTES
Typing more than 30 characters prevents the answerback message from being
permanently stored. If this occurs a bell rings and the entire procedure (starting with
CTRL and HERE IS) must be repeated.
If no answerback message is desired, do not type any characters (skip the next
step).

Type up to 30 characters to
enter answerback message.

Message prints and is temporarily
stored.
If no characters have been typed the
LA 120 is set up for no answerback
message.

NOTE
If you do not wish to permanently store the answerback message skip the next
step.

Press and hold CTR Land
press HERE IS.

Answerback message is permanently stored (nu meric display
goes blank for a few seconds).

Exit SET-UP mode.

SET -U P light stops flashing.

Auto Answerback
NOTE
This feature does not affect
the HERE IS key, or response to ENQ from your
system.

This feature automatically transmits the answerback message the first
time the LA 120 is transmit-enabled after the modem enters data mode.
Procedure

. 1ndication/Com ments.

Enter SET-U P mode

SET -U P light flashes to indicate
you are in SET-U P mode.

PressG

Current selection of auto answerback appears in numeric display.

Press
again to change
selection

Numeric display indicates either:

o = auto answerback feature is
turned off
1 = auto answerback feature is
turned on.

Exit SET-UP mode

SET - UP light stops flashing.

38 OPERATOR INFORMATION

Buffer Control
Typically a printer receives a series of characters, temporarily stores
them in a buffer, and then prints them one at a time.
During synchronization, the LA 120 constantly monitors the number of
characters stored in its input buffer. When the number of characters exceeds a "high water mark," the LA 120 signals the data source to temporarily pause. Meanwhile, the printer continues to take characters out of the
input buffer. When the number of characters remaining is less than a "low
water mark," the LA 120 signals that transmission may resume. The values
used for the high and low water marks are determined by selecting a small
or large buffer. For additional information see Chapter 3.
When the LA 120 is switched off-line, it may continue to print several
lines of data. This is a normal condition when using the large buffer.
Summary Table
Control

Comment

Small buffer

Recommended when terminal is used interactively.

Large buffer

Recommended when LA 120 is used primarily as a
printer.

Procedure

Indication/Comments

Enter SET-UP mode

SET-UP light flashes to indicate
you are in SET -U P mode.

Press

I I
@

Press @ lagain to change
selection

Current selection of buffer
appears in numeric display.

Numeric display indicates either:

o = small buffer

1 = large buffer.

Exit SET-UP mode

size

SET-UP light stops flashing.

OPERATOR INFORMATION 39

Keyboard and Printer Character Set
This feature enables the LA 120 keyboard and printer to function in a
specific national language. The standard choices are United States and
United Kingdom. Finnish, Swedish, Norwegian/Danish, German, and
French are optional and require different keycaps.
Procedure

Indication/Comments

Enter SET -UP mode

SET-UP light flashes to indicate
you are in SET-U P mode.

PressG

Current keyboard and printer character set appears in numeric display.

Press G
again to change
selection

Numeric display indicates:
United States

2 United Kingdom
3 Finland
4 Sweden
5 Norway/Denmark
6 Germany

}

Standard

Optional

7 France

SET - U P light stops flashing.

Exit SET-UP mode
Printer Character Set

This feature enables you to receive messages in a specific national
language that is different from your keyboard. These character sets are:
United States
}
United Kingdom
Finland
Sweden
Norway/Denmark
Germany
France

Standard

Optional

For example, you are an international firm and your daily business over
NOTE the LA 120 is conducted in English. A Swedish customer decides to send an
This feature has no effect on
the keyboard.

order in Swedish. You would select character set 4 enabling you to receive
and print the order in Swedish.

40 OPERATOR INFORMATION

Procedure

. Indication/Comments

Enter SET-UP mode

SET-UP light flashes to indicate
you are in SET-UP mode.

Press[J

Current printer character
appears in numeric display.

Press ~ again to change
selection

Numeric display indicates:

3
4
5
6
7
Exit SET-UP mode

set

United States
United Kingdom
Finland
Sweden
Norway/Denmark
Germany
France

}

Standard

Optional

SET-U P light stops flashing.

Auto Disconnect
Auto disconnect hangs up the phone when the LA 120 runs out of paper.
the cover opens. or the print head jams. This feature is most useful if your
terminal is unattended.
There are two additional ways to cause an auto disconnect:
• Manually by pressing and holding CTR L and pressing

[!]

• Remotely by receiving EOT (end of transmission) from your computer.
When auto disconnect is off. data terminal ready is always asserted. See
Chapter 4 for additional information.

Procedure

Indication/Comments

Enter SET-UP mode

SET-UP light flashes to indicate
you are in SET-UP mode.

Press li~]

Current selection of auto disconnect
appears in numeric display.

Press
again to change
selection

Numeric display indicates either:

o = off
1 = on.

Exit SET-UP mode

SET-UP light stops flashing.

NOTE
If auto disconnect is not
used it must be set to off.

OPERATOR INFORMATION 41

Local Echo
NOTES
If your computer does not
echo characters, local echo
feature should be selected.
ENQ characters are never
echoed

Selecting local echo causes each typed character to be transmitted and
printed. If local echo is not selected. pressing a key will only transmit the
character.

LOCAL ECHO = ON
CHARACTER TRANSMITTED
AND PRINTED

LOCAL ECHO = OFF
CHARACTER TRANSMITTED
ONLY
MA-2299

Procedure

Indication/Comments

Enter SET-UP mode

SET-UP light flashes to indicate
you are in SET -U P mode.

press[~
Press [~#--] again to change
selection.

Current selection of local
appears in numeric display.

Numeric display indicates either:

o = off
1

Exit SET-UP mode

echo

= on.

SET-UP light stops flashing.

Auto New Line at Right Margin
This fea,ture when selected causes the LA 120 to generate an internal
carriage return and line feed if the incoming message tries to print beyond
the right margin.
This is extremely useful in a message network where the accidental
omission of a carriage return code results in the partial loss of the message.
If not selected. printing beyond the right margin sounds the bell and
characters are lost.
Procedure

Indication/Com ments

Enter SET-UP mode

SET -UP light flashes to indicate
you are in SET-UP mode.

Press [----;~-J

Current selection of auto new line
appears in numeric display.

Press ["~:-] again to change
selection

Numeric display indicates either:

Exit SET-U P mode

SET -U P light stops flashing.

o = auto new line feature off
1 = auto new line feature on.

OPERATOR INFORMATION

Auto Line Feed
The auto line feed feature enables the R ETU R N key on the LA 120 to
function like the return key on a standard electric typewriter. When the auto
line feed feature is turned on, pressing the RETU R N key generates the
carriage return (CR) and line feed (LF) codes. When the auto line feed
feature is disabled, the R ETU R N key generates only the carriage return
(CR) code.
Procedure

Indication/Comments

Enter SET-U P mode

SET-UP light flashes to indicate
you are in SET-UP mode.

Press

I'If I
[Kj

Press
again to change
selection

Current selection of auto line feed
appears in numeric display.
Numeric display indicates either:

o = off

1 = on.

Exit SET-UP mode

SET-UP light stops flashing.

Modem
This feature enables selection of a protocol that matches your communication requirements (see Chapter 4).
Refer to the half duplex initial calling state and the secondary channel
procedures for related modem SET-UP features.
Selectable Protocols
Full duplex without EIA control (no modem)
Full duplex with EIA control (modem)
Half duplex with supervisory control
Half duplex with coded control (EOT turnaround)
Half duplex with coded control (ETX) turnaround)
Procedure

Indication/Com ments

Enter SET-UP mode

SET-UP light flashes to indicate
you are in SET-UP mode.

Press ~

Current selection of modem
protocol appears in numeric display.

Press ~ again to change
selectIon

Numeric display indicates:

Exit SET-UP mode

SET -U P light stops flashing.

1 FOX, no modem
2 FOX, modem
3 H DX, supervisory
4 HOX, EOT
5 HOX, ETX

NOTES
If a double line feed occurs,
turn this feature off since the
computer is already performing this function automatically.
In coded control half duplex,
the RETU RN key transmits
the turnaround character
automatically after transmitting its normal code or
codes.
The E NTE R key on the numeric keypad is also affected
by this feature.

OPERATOR INFORMATION

Half Duplex (H OX) Initial Calling State
When the LA 120 initiates communication with a computer, the condition of the H DX initial calling state is checked. The condition of this state
determines if the LA 120 starts receiving or transmitting. This feature can
only be used if choice 4 or 5 of the modem procedure has been selected.

Procedure

Indication/Comments

Enter SET - UP mode

SET-UP light flashes to indicate
you are in SET -U P mode.

Press

C!J
CiJ

Current selection of H DX initial calling state appears in numeric display.

Press
again to change
selection

Numeric display indicates either:

o = transmit
1 = receive.

SET -U P light stops flashing.

Exit SET-UP mode

Secondary Channel
This feature has two meanings. First. if modem choices 1 or 2 (full
duplex) were selected, the secondary channel feature can be used to
indicate the restraint mode.
The second meaning applies when half duplex modem choices 4 or 5 are
selected. The secondary channel feature can now be used to indicate the
presence of a secondary (reverse) channel.

Procedure

Indication/Comments

Enter SET - UP mode

SET-UP light flashes to indicate
you are in SET-UP mode.

Press

!~ I

Press [ ~ again to change
selection

Current selection of secondary
channel appears in numeric display.

Numeric
Display
Indicates

Modem
1 or 2
Selected

Modem
4 or 5
Selected

Speed control mode
Restraint mode

Secondary channel - no
Secondary channel - yes

Exit SET-UP mode

SET-UP light stops flashing.

OPERATOR INFORMATION

Parity and Data Bits
Parity enables data errors to be monitored and thereby verifies correct
data. If an error in transmission occurs. the LA 120 detects it and prints a
symbol ( ~ ).
In addition to parity. this feature enables selection of seven or eight data
bits.

Procedure

Indication/Comments

Enter SET-U P mode

SET-UP light flashes to indicate
you are in SET -U P mode.

Press L,=J

Current selection of parity and data
bits appears in numeric display.

Press L~=] again to change
parity and data bit selection
Numeric
Display
Data Parity
Indicates Bits Rec
1
2
3

4
5
6
7
8
9
10
Exit SET-UP mode

7
7
7
7
7
7
7
8
8
8

Ignore
Ignore
Ignore
Ignore
Odd
Even
None
None
Odd
Even

Parity
Transmit
Mark
Space
Odd
Even
Odd
Even
None
None
Odd
Even

SET-U P light stops flashing.

NOTE
When eight data bits are selected the LA 120 ignores the eighth data bit on
characters received and transmits all characters with the eighth data bit set to zero.

OPERATOR INFORMATION

Printer New Line Character
This feature controls how the LA 120 responds to line feed or carriage
return codes it receives. You can select three different ways for the LA 120
to respond as described in the following table.
NOTE
In choice 2 the LA 120 also
performs a carriage return
when it receives vertical tab
and form feed characters.

Selections
Indicated
by Numeric
Display

Carriage
Return
Code
Received

LA 120 performs carriage
return.

LA 120 performs line feed.

LA 120 performs carriage
return.

LA 120 performs carriage return and line feed.

LA 120 performs carriage
return and line feed.

LA 120 performs line feed.

Line
Feed Code
Received

Procedure

Indication/Comments

Enter SET-U P mode

SET-UP light flashes to indicate
you are in SET -U P mode.

Press~

Press~ again to change
selection

Current selection of printer new line
character appears in numeric
display.
Numeric display indicates either:

1 . No new line character
2.
3.

Exit SET-UP mode

Line feed new line mode
Carriage return new line mode

SET -UP light stops flashing.

XON/XOFF
NOTES
XON/XOFF should only be
changed when your system
is not sending data.

If the terminal does not print
on-line it may be necessary
to type CTRL-Q.

The LA 120 is capable of automatically generating the XON (DC1) and
XOFF (DC3) codes. XOFF stops transmission of data from the computer
to the terminal. while XON resumes transmission.
For related information refer to the buffer control procedure.
Procedure

I ndication/ Comments

Enter SET-UP mode

SET-UP light flashes to indicate
you are in SET-UP mode.

Press

0
0

Current selection of XON/XOFF
appears in numeric display.

Press
again to change
selection

Numeric display indicates either:
= XON/XOFF is disabled
1 = XON/OFF is enabled.

Exit SET-UP mode

SET-UP light stops flashing.

OPERATOR INFORMATION

Alternate Keypad Mode
This procedure enables the optional numeric keypad to be used in two
ways: to generate character codes, or to generate escape sequences. The
following table describes the characters and escape sequences generated
by the 18 keys on the keypad.
Character or Escape Sequence Transmitted
Numeric
Keypad Key

Normal
Keypad Mode

Alternate
Keypad Mode

PF1
PF2
PF3
PF4
ENTER

ESC 0 P
ESC 0 Q
ESC 0 R
ESC 0 S
Same as
RETURN key

ESC 0 P
ESC 0 Q
ESC 0 R
ESC 0 S
ESC 0 M

(comma)
(dash)
(period)

ESC 0 I
ESC 0 m
ESC 0 n
ESC 0 P
ESC 0 q

2
3
4
5
6

ESC 0 r
ESC 0 s
ESC 0 t
ESC 0 u
ESC 0 v

7
8
9

ESC 0 w
ESC 0 x
ESC 0 y

(comma)
(dash)
(period)

Procedure

I ndication/ Com ments

Enter SET-U P mode

SET - UP light flashes to indicate
you are in SET-U P mode.

Press 0

Current selection of alternate
keypad mode appears in numeric
display.

Press 0again to change
selection

Numeric display indicates either:

o = normal keypad mode

1 = alternate keypad mode.

Exit SET-UP mode

SET-UP light stops flashing.

NOTE
When in alternate keypad
mode and local the numeric
keypad cannot be used to
print characters.

OPERATOR INFORMATION

Alternate Character Set
NOTES
The APL character set is
part of the National Character Set option.
When the LA 120 is printing
APL characters the AL T
CHAR SET light is on.

The alternate character set feature is used only with the APL character
set (a programmer's language, see note 1). To use the APL character set,
first set the alternate character set feature to on (1). Then the LA 120 can
manually or automatically switch (under computer control) between the
selected printer character set and the APL character set. When switched to
APL, data from your computer prints as APL characters. (For additional
information see APL character set description in the programmer's chapter.)

Selecting Alternate Character Set

If in SET-UP mode with APL
selected,
the status
message and self-test will
be printed out using APL
symbols.

Procedure

Indication/Comments

Enter SET-U P mode

SET-UP light flashes to indicate
you are in SET-UP mode.

NOTE
When using the APL keyboard the keyboard character set should be set to 1 or 2.
(See the keyboard and printer character set procedure in this chapter.) The printer
character set can be set to select any national language.

Press the letter

PressG again to change
selection

Exit SET-UP mode

Current selection of alternate
character set appears in numeric
display.
Numeric display indicates either:
0= shift out disabled (APL cannot be selected)
1 = shift out enabled (APL can
be selected)
SET - UP light stops flashing.

Manually Selecting APL

NOTE
Alternate character set must
be set to 1 to select APL.

Procedure

In dication/Com ments

Enter LOCAL by pressing
LINE/LOCAL

LOCAL light goes on indicating you
are in LOCAL.

PressCTRLG

APL is selected.

Press LIN E/LOCAL for
LINE

LA 120 is now on-line and can send
and receive APL characters.

48 OPERATOR INFORMATION

Manually Deselecting APL

Procedure

I ndication/ Co m ments

Enter LOCAL by pressing
LINE/LOCAL.

LOCALlight goes on indicating you
are in LOCA L.

Press CTR L [(~) jOetter)

APL is deselected.

Press
LINE

LA 120 is on-line and APL is no
longer selected.

LINE/LOCAL for

Break Action

Enabling (turning on) break action causes the LA 120 to automatically
send a break signal in response to paper out, cover open, head jam, or
pressing BREAI<.
If your communication system is set up to recognize break, sending the
break signal may hang up the phone. The phone can also be hung up if auto
disconnect is enabled. (See the auto disconnect description in this chapter.)
With break action disabled paper out, cover open, head jam, or pressing
B R EA I< will not generate a break signal. (For additional information, see
the break key description in the programmer's chapter.)

Procedure

I ndication/ Com ments

Enter SET-U P mode

SET - U P light flashes to indicate
you are in SET-U P mode.

Press 0

Current selection of break action
appears in numeric display.

Press 0again to change
selection

Numeric display indicates either:

Exit SET-UP mode

SET-UP light stops flashing.

o = disabled
1 = enabled.

OPERATOR INFORMATION

STORE, RECALL, AND STATUS FEATURES
The LA 120 contains one operating (temporary) memory and two permanent memories. One permanent memory is for user information, the
other contains the original factory settings.
Temporary memory is like the memory in most calculators. When power
is turned off information is lost. Your LA 120 operates from this memory.
When power is turned on, information in the user permanent memory is
loaded into the operating memory. The LA 120 then uses this information
for its operation. When new SET-UP information is generated it is loaded
directly into the operating memory. To place new SET -U Ps in the user's
permanent memory the store procedure must be performed. To read the
contents of the operating memory simply perform the status procedure.
User permanent memory stores important or commonly used SET-UP
information. This memory is read/write like the tape in your tape recorder.
That is, new information can be stored or old information changed. To store
or recall information, see STORE/RECALL procedure.
NOTE
Factory permanent memory is set at the factory with typical SET-U P
No power or batteries are information. This memory is read-only; it cannot be changed or erased. It is
required to retain informa- like the record on your record player. To use the factory setting perform the
tion in permanent memories. factory stored settings procedure.

OPERATING
MEMORY
(TEMPORARY MEMORY;
INFORMATION IS
LOST WHEN POWER
IS TURNED OFF)

FACTORY
SETTINGS

STORE

FACTORY
PERMANENT
MEMORY

RECALL

USER
PERMANENT
MEMORY

y
THE TWO PERMANENT MEMORIES
ARE NOT AFFECTED WHEN
POWER IS TURNED OFF

MA-2824

50 OPERATOR INFORMATION

Factory Stored Settings
This procedure enables you to change the state of all LA 120 settings to
the values originally set at the factory. This is useful if you have no special
setting requirements, or if you desire a specific starting point for your SETUP. The original factory settings are:

Parameter

Setting

.
HOrizontal
tab stops *

1,9,17,25,33,41,49,57,65,73,
81,89,97,105,113,121,129,137,
145,153,161,169,177,185,193,
201, 209, 217

Vertical tab stops *

1,9,17,25,33,41,49,57,65,73,
81,89,97,105,113,121,129,137,
145, 1 53, 161

Left margin
Right margin
Top margin
Bottom margin
Line/local status

132
1
66
On-line

Parameter

Setting

Parameter

REC
XMT
A
B
C

1200
1200
0

M
N

0
P
Q

D
E
F

G
H

J
K
L

Setting

1
0
66
1
10

R
S
U
V
W

1
0
0

o
6

* Tab stops are located every eight columns or lines.

Procedure

Indication/Com ments

Enter SET-UP mode

SET -U P light flashes to indicate
you are in SET-UP mode.

Press the letter

Exit SET-U P mode

LA 120 operating memory is loaded
with factory stored settings.
SET"U P light stops flashing.

OPERATOR INFORMATION

Store/R ecall
Setting up your LA 120 is normally a one-time job. This is due to a unique
feature that stores all your settings in the user permanent memory; that is.
the LA 120 can be turned off without losing the following settings:

NOTES
SET-UPs must be stored in
the user permanent memory
to be saved. Current column
and line numbers are not
saved.

Line/local state
Horizontal tab stops
Vertical tab stops
Left margin
Right margin
Top margin
Bottom margin
Line/local status
Baud rate
Answerback
Buffer control
Printer character set
Auto disconnect
Local echo
Form length

Horizontal pitch
Auto new line
Key click
Auto line feed
Modem
Keyboard and printer character set
H DX initial calling state
Auto repeat
Secondary channel
XON/XOFF
Alternate keypad mode
Auto view
Printer new line character
Alternate character set enable
Break action

When the LA 120 is turned on it automatically enters the last settings
stored by the operator.

Store
Procedure

Indication/Comments

Enter SET-UP mode

SET-UP light flashes to indicate
you are in SET -U P mode.

Press and hold SH I FT and

All settings in operating memory are
stored in user permanent memory.
Numeric display goes blank for a
few seconds.

press! ~)

Exit SET-UP mode

SET -U P light stops flashing.

Recall
Procedure

Indication/Comments

Enter SET-UP mode

SET-U P light flashes to indicate
you are in SET -U P mode.

Press\ \~I

Exit SET-UP mode

The latest settings stored in user
permanent memory are recalled.
Numeric display goes blank for a
few seconds.
SET -U P light stops flashing.

52 OPERATOR INFORMATION

Status
What is the status (contents) of the LA 120 temporary memory? A
special feature of the LA 120 is a printout of all current SET-UP values
except tabs and margins.
To read margins and tabs refer to vertical and horizontal margin and tab
SET-UP procedures.
The following is a sample printout of the status message using the
factory parameters.
Typical Status Message
Setting
Parameter
REC
1200
XMT
1200
0
A

Parameter
M
N

Setting

0
P

1
0

E
F
G
H

1
10

R
S
U
V
W

1
0
0

X
Y
Z

J
K
L

o
1
6
1

o
1

The following sample SET-UP label defines the status message.
REC
XMT
A
B
C

E
F
G
H

J
K
L
M
N

P
Q
R
S
U
V
W
X
Y
Z
I
T

Receive baud rate
Transmit baud rate
O=Off
1 =On
Auto-answerback
Buller control
0 = Small 1 = Large
Printer char. set
1=US
2=G8
Auto-disconnect
0=011
1 =On
Localecho
0=011
1=On
Form length
Lines per lorm
Bell volume
O=low
1 =High
Horizontal pitch
Char. per Inch
Auto-newline
O=Off
1 =On
Key click
0=011
1 =On
Auto-lineleed
0 = 011
1 = On
Modem/protocol
Keyboard char. set 1 = US
2 = GB
All. char. set
O=Off
1 =On
Parity/data bits
HDX initial state
0 = XMT
1 = REC
Auto-repeat
O=Off
1 =On
Secondary channel 0 = No
1 = Yes
Break enable
0 = No
1 = Yes
Vertical pitch
Lines per Inch
Printer NL char.
1 = None 2 = LF 3 = CR
XON/XOFF
O=No
1 = Yes
Alt keypad mode
0 = No
1 = Yes
Auto-view
0=011
1 =On
Initialize to lactory settings
Sell test: Type a character to stop

Procedure

Indication/Comments

Enter SET-UP mode

SET - UP light flashes to indicate
you are in SET-UP mode.

I I

Press m
Exit SET-UP mode

Status message prints out.
SET-UP light stops flashing.

NOTE
Do not press SHIFT when
printing out the status
message.

OPERATOR INFORMATION 53

Self-Test Feature
If it appears that a problem exists in the LA 120. you can initiate a selftest. Two tests are provided. One prints out characters within the currently
selected margins; the other causes the LA 120 to go through the same
motions as the printing test. but without printing. Use the nonprinting selftest if your printer is loaded with valuable forms such as checks or tickets.
Sample Self-Test Printout

",-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\
·-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]
·./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]~
./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]~_

'0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]~_'
)123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]~_'a
.23456789:;<=>?@ABCDEFGHIJKLMNOpaRSTUVWXYZ[\]~_'ab

!3456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]~_'abc
~456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]~_'abcd

l56789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]~_'abcde
i6789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]~_'abcdef

;789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]~_'abcdef~

Printing Self-Test
Procedure

Indication/Comments

Enter SET-UP mode

SET- UP light flashes to indicate
you are in SET-U P mode.

Press0 to initiate self-test

LA 120 prints out the self-test
pattern.

To stop test. exit SET-UP or
press any character

Selt-test terminates.

Exit SET-UP mode

SET-UP light stops flashing.

Nonprinting Self-Test

Procedure

I ndication/ Com ments

Enter SET-UP mode

SET - UP light flashes to indicate
you are in SET-U P mode.

Press and hold SH I FT and
press

LA 120 performs a nonprinting selftest.

To stop test exit SET-UP or
press any character

Nonprinting self-test terminates.

Exit SET-UP mode

SET-UP light stops flashing.

OPERATOR INFORMATION

PART 3

RIBBONS, FORMS, AND IMPRESSIONS

INSTALLING RIBBON
The ribbon used in the LA 120 provides approximately six to eight hours
of continuous printing. When the print contrast becomes too ,light the
ribbon may be turned over for two more hours of printing and then it should
be replaced.
1. Open top cover.
2. Move carriage adjustment lever toward the operator.
3.

CAUTION
Only DIGITAL-recommended
ribbons (part no. 36-12153
-01) should be used in the
LA 120. Other ribbons can
damage the print head and
may void the warranty.

Remove old ribbon, saving empty spool.

4. Attach the hook located on the end of the ribbon to the empty spool.
5. Wind 10 turns of ribbon onto the empty spool.
6. Place the full spool on the left spool shaft and turn clockwise until
it drops into position.

NOTE
If on-line, opening the top
cover can cause the telephone line to be disconnected.

7. Install new ribbon as shown.
8. Adjust impression (described in the following paragraphs).
9. Close cover.

PRINT IMPRESSION ADJUSTMENT
1. Open cover.

NOTE

2. Using carriage adjustment lever, adjust print head for contact with
your form.
3. Manually move print head and carriage to the side to check for form
smudging or paper rippling.
4. Close cover and type about 10 characters.
5. If smudging or rippling occurs, open cover and move the carriage
lever slightly away from the paper (toward operator). Repeat step 3.

~ n
CARRIAGE!
ADJUSTMENT
LEVER

MA3381

Ribbon rivet must be on
empty spool to ensure correct operation of directionchanging mechanism.

OPERATOR INFORMATION

LOADING PAPER/FORMS
The LA 120 accepts sprocket-fed, multipart paper/forms ranging in width
from 3 to 14-7/8 inches. (Paper specifications are in Chapter 2.)

Initial Paper/Forms Loading
1. Turn the printer off; then open the cover.
2.

Loosen the left and right tractor adjusting screws.

Position the left tractor feed pins approximately two inches from the
left sideplate; then tighten the left tractor adjusting screw. This
provides optimum margins for 132-column paper. It may be
necessary to readjust when using preprinted forms.

4. Open both tractor covers and move the print head adjustment lever
toward you.

NOTE
If the paper pulls against the

tractor pins or bows in the
middle, readjust the right
tractor.

Place the paper/forms on the floor between the legs of the LA 120.
Align the leading edge of the paper parallel to the paper slot. Align
the left edge of the paper with the left tractor.

Feed the paper up through the paper slot. Align the left margin holes
over the feed pins. Close the left tractor cover.

7. Align the right margin holes over the feed pins. Tighten the right
tractor adjusting screw and close the right tractor cover.
8.

Perform the print impression adjustment.

9. Set up your form as described in the forms section of this chapter.

LEFT EDGE PARALLEL
TO TRACTOR FEED PINS

MA·2313

OPERATOR INFORMATION

LEFT TRACTOR
ADJUSTING KNOB

RIGHT TRACTOR
ADJUSTING KNOB

RELOADING PAPER/FORMS
The LA 120 operates normally until the end of the form passes the print
head. When out of paper, printing stops, the PAPER OUT lamp flashes,
and the bell sounds for five seconds. The operator should then perform the
following procedure.

MA·2298

Procedure

Indication/Comments

1. Open the cover
2. Open the tractors and
load the paper
NOTE
Perform step 3 before closing the cover.

3. Use the paper advance
knob to align the form
perforations halfway between the top of the
print head and line indicator as shown in the
figure.
4. Close the cover.

PAPER OUT light stops flashing.
Printing resumes automatically at
the correct column and line location.

NOTE
Do not turn power off to
load paper. This causes the
loss of temporarily stored
features.

~nsta~~ation, ~nter1acing and Speci1ications

CHA~T[E~

~ NSu AllA u~ 0 N, ~ NuE ~ fACE, aJUld
SP[EC~f~CAT~ONS

INSTALLATION AND CONFIGURATION
This section contains step-by-step procedures for unpacking, cabling,
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 LA 120 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-inch clearance between units must be maintained at all
times. Figure 2-1 illustrates site considerations.

27.5"

If=:;==:JrTI<'l

[--1699mml ]

,-- ----------1

-~ __

:ill

OPTIONAL 12.0"
PAPER
(305m)
BASKET
m

24.0"

~____-r-'J~ml

33.5"
(851mm)

L 21.7" --l
(551mm)

L_25.0"
(635mm)

I
I

I
:

OPERATOR
I
1L __________
AREA
JI
MA3383

Figure 2-1

LA 120 Site Considerations

INSTALLATION, INTERFACE, AND SPECIFICATIONS

UNPACKING AND INSPECTION
1. Cut the nylon retaining straps from around the shipping carton and
discard them.
2. Remove the outer cardboard shipping container.
3.

Remove all shock-absorbing material and packing from around the
LA 120 (Figure 2-2).

4. Loosen and remove the hex-head bolts that secure the wood leg
brace to the skid assembly. Remove the microfoam around each leg
of the LA 120.
5. Carefully inspect the LA 120 cabinet and carriage assembly for
possible shipping damage. Inspect and check the enclosed packing
list for lost or missing items. Report any damaged or missing items
to the local DIGITAL Field Service or Sales Office and the local
carrier.
6. Remove the printer from the wooden shipping skid and place it in
the desired location.
7. Install and adjust the levelling feet on the LA 120 legs.
8. Lift the LA 120 top cover assembly. Clip and remove the nylon cable
tie securing the print head assembly.
9. If necessary, wipe all outer surfaces with a clean, soft, lint-free cloth.

10. Connect the EIA interface cable to the user's equipment.
11. The LA 120 SET-U P label is enclosed in the package with this
manual. Fasten the label to the area shown in the figure on the next
page.
NOTES
To install the 20 mA option
refer to Chapter 5.
Site plans are not supplied
by Digital Equipment Corporation.

FULL
TELESCOPE
CAP

Interface logic connections
must be specified and provided by the system supplier
or the customer because
each installation may differ.

STITCHED
TUBE

POLYBAG

WOOD BRACE

HEX-HEAD BOLTS
MICROFOAM

WOOD SKID

TEE NUTS

Figure 2-2

Unpacking/Packing

INSTALLATION. INTERFACE. AND SPECIFICATIONS

REC

xur

Receive baud rate
Transmit baud rate

R
S
U
V
W
X
Y
Z
I

Auto~8nswerback
0""'0"
1 =On
Buffer control
0 =- Small 1 ~ large
Printer char. set
1=U5
2=G8
Auto-disconnect
0 Otf
1 = On
Loca' echo
0=011
1 =On
Form length
Lines per form
Bell volume
0 =- low
,;: High
HOrizontal pitch
Char. per Inch
Auto-newline
O=Off
1 =On
Key click
0=011
1 =On
Auto-linefeed
0:::: Off
1 =- On
Modem/protocol
Keyboardchar.sel l=US
2=GB
Alt. char. sel
0=011
1 =On
Parity/data bits
HDX initial state
0 = XUT
1-= REC
Auto-repeat
0 Off
1 = On
Secondary channel 0:::: No
1 ::;: Yes
Break enable
0 =< No
1 :;:; Yes
Vertical pitch
Lines per Inch
Printer Nl char.
1 = None 2=LF 3=CR
XON/XOFF
O=No
I=Yes
Ait keypad mode
O=No
,:;: Yes
Auto-view
O-=Off
1:.eOn
Initialize to factory settings

Selt test: Type a character to stop

A
B
C

o
E
F
G
H

J
K

l
M
N

o
P
Q

VOLTAGE SELECTOR SWITCH

CAUTION

The LA 120 is currently being manufactured with a voltage selector
switch. The switch is located above the ON/OFF switch.
Place the tip of a pen into the switch indentation and select the appropriate voltage. as shown in the accompanying figure.

Failure to set the switch to
230 V when plugging the
LA 120 into a 180-256 V
power source will damage
the power supply.

MA-3561

PACKING PROCEDURES
If it becomes necessary to ship your LA 120 to another location. repack
it per the following procedure.
1. Remove the ribbon and paper.
2. Use a nylon cable tie to secure the print head assembly. This
prevents movement during transit.
3. Pack the LA 120 as shown in Figure 2-2.

INSTALLATION, INTERFACE, AND SPECIFICATIONS

CHECKOUT PROCEDURE

1. Install a ribbon and paper per the procedures in part 3 of the
operator's chapter.
2. Connect the LA 120 line cord to the correct wall receptacle. Set
the power switch to ON. The print head automatically positions
itself to the left margin.
3.

Perform the self-test procedure in part 2 of the operator's
chapter.

CAUTION
Before connecting the LA 120
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 is OFF.

ANSWERBACK JUMPER

To obtain a permanent answerback message that cannot be changed by
the operator, remove the jumper shown in the following figure.

Procedure

1. Store answerback message if req'uired.
2. Verify answerback message.
3. Turn power off.
4.

Remove jumper.

5. Turn power on.

EIA CONNECTOR
MA-2318

NOTES
The answerback message
must be stored in permanent
memory prior to removing
the jumper.
If the jumper is removed the
answerback message cannot be altered or erased.

INSTALLATION, INTERFACE, AND SPECIFICATIONS

INTERFACE INFORMATION
EIA Interface
The LA 120 interfaces with EIA devices using an optional modem cable.
The interface is compatible with Bell 103, 212A, and 202 modems and
meets the requirements of EIA specification RS232-C. The following
paragraphs describe the interface signals.
EIA Cables
NOTES
1. For longer lengths use
BC03M-(specify length)
instead of BC22A.
2. For longer lengths or full
25 conductors use BC05D
-(specify length) instead of
BC22B.

BC22A-10 or 25 (see note 1)-1 0 and 25 foot lengths for hookup
between LA 120 and computer. Each end is terminated with a female
molded connector. Cable is shielded, contains six conductors, and is wired
in a null modem configuration.
BC22B-10 or 25 (see note 2)-10 and 25 foot lengths for hookup
between LA 120 and modem. Can also be used for cable extension.
Connectors are molded with a male connector at one end and a female
at the other end. Cable is shielded, and has 14 conductors.
Protective Ground-This conductor is connected to the LA 120 chassis.
It is further connected to external grounds through the third wire of the
power cord.
Transmitted Data (TDX) Direction: from LA 120-Signals on this
circuit represent serially-encoded characters generated by the LA 120.
Received Data (R DX) Direction: to LA 120-Signals on this circuit
represent serially-encoded characters generated by the user's equipment.
Request to Send (RTS) Direction: from LA 120-The on condition of RTS
means that the LA 120 intends to transmit data. After turning this circuit on,
the LA 120 waits for a clear to send (transmit enable) condition before
starting transmission.
Clear to Send (CTS) Direction: to LA 120-Although the LA 120 physically receives this signal, it is not used for any purpose. Depending on the
modem control protocol in use, either RLSD, SRLSD, or a timeout after
asserting RTS is used to provide a clear to send (transmit enable) condition.
Data Set Ready (DSR) Direction: to LA 120-The on condition of DSR
indicates that the users' equipment is capable of transmitting and receiving
data signals. The off condition of DSR causes the LA 120 to ignore all other
interface inputs except ring indicator (RI). In full duplex without EIA control,
this circuit is assumed to always be in the on condition.
Signal Ground-This circuit establishes the common ground reference
potential for all interface circuits except protective ground. The circuit is
permanently connected to the protective ground circuit.
Carrier Detect (RLSD) Direction: to LA120-The on condition of RLSD
indicates that data transmission from the users' equipment to the LA 120 is
enabled. In full duplex without EIA control, this circuit is assumed to always
be in the on condition.

INSTALLATION, INTERFACE, AND SPECIFICATIONS

Speed Indicator (SPDI) Direction: to LA 120 (full duplex only)-The on
condition of SPDI indicates that the baud rate is 1200, regardless of the
rate selected by the operator. The off condition indicates that the operatorselected baud rate is being used.
Secondary' Carrier Detect (SRLSD) Direction: to LA 120 (half duplex
only)-The on condition of SRLSD indicates that the users' equipment is
capable of successfully processing the transmitted data from the LA 120.
Secondary Request to Send (SRTS) Direction: from LA 120-ln certain
half duplex modes the on condition of SRTS indicates that the LA 120 is
capable of successfully processing the received data from the users'
equipment. In restraint mode, the off condition of SRTS indicates that the
users' equipment should temporarily suspend the transmission of data.
When SRTS goes on, transmission may be resumed.
Data Terminal Ready (DTR) Direction: from LA 120-The on condition
of DTR indicates that the LA 120 is capable of transmitting and receiving
data signals. The off condition of DTR may cause the users' equipment to
set the data set ready (DSR) to the off condition. The LA 120 ignores all
interface inputs except ring indicator (RI) when DTR is off.
Ring Indicator (R I) Direction: to LA 120 - If data terminal ready (DTR) is
off, the on condition of RI causes DTR to turn on. DTR remains on until data
set ready (DSR) turns on or 30 seconds elapses, whichever occurs first.
Then DTR turns off. If DTR is on, the on condition of RI causes a 30-second
timeout. If no data is received in 30 seconds, DTR is pulsed low for 233 ms
- 10 to + 10 percent.
Speed Select (SPDS) Direction: from LA 120 {full duplex only)-If the
operator-selected baud rate is 1200 or higher, the LA 120 asserts an on
condition on SPDS; otherwise the LA 120 holds this circuit in the off
condition.

Summary of LA120 EIA Interface Signals
Pin
1
2
3
4

5
6

7
8
9
10
11

Source

Name

Function

LA120
User
LA120
User
User

TXD
RXD
RTS
CTS
DSR

User

RLSD

Protective ground
Transmitted data
Received data
Request to send
Clear to send
Data set ready
Signal ground
Ca rrie r detect

LA120

SRTS

Sec. REQ. to send

Circuit
CCITT/EIA
101/AA
103/BA

104/BB
105/CA
106/CB
107/CC
102/AB
109/CF

120/SCA

INSTALLATION, INTERFACE, AND SPECIFICATIONS

NOTE
Pins ", 19, and 23 are
driven by a common circuit
whose function is determined by the modem and
secondary channel SET-UP
commands.

Source

Name

Function

Circuit
CCITT/EIA

12
12
13
14
15
16
17
18
19
20
21
22
23
24
25

User
User

SPDI
SRLSD

Speed indicator (FDX)
Sec. carrier det. (H DX)

CI
122/SCF

LA120
LA120

SRTS
DTR

Sec. req. to send
Data term ready

120/SCA
108.2/CD

User
LA120

RI
SPDS

Ring indicator
Speed select (FDX)

125/CE
CH

IMPEDANCE OF TERMINATOR
The terminating impedance of the receiving end of the interface circuits
has a dc resistance of not less than 3000 ohms nor more than 7000 ohms.
When the interface plug is disconnected, the interface voltage on terminator circuits is -2 V to +2 V.
RISE AND FALL TIMES
The circuitry that receives signals from an interface circuit is dependent
only on the signal voltage and conforms to RS232-C risetime and falltime.
For control interface circuits, the time required for the signal to pass
through the transition region (-3 V to +3 V) during a change in state does
not exceed 1 IL s. For the transmitted data circuit the risetime and falltime
does not exceed 16.7 JL s through the 6 V range (-3 V to +3 V). The
received data and the clock signals also meet this limit.

OPEN CIRCUIT VOLTAGES
The open circuit driver voltage for signal ground on any interface circuit
does not exceed -12 V to + 12 V. The terminator on an interface circuit is
designed to withstand any input signal within the -25 V to +25 V limit.
When the terminating impedance is in the proper range (3000 to 7000
ohms) and the terminator open circuit voltage is zero, the potential at the
point of interface is not less than -5 V to +5 V or more than -12 V to
+ 12 V. An open circuit or applied voltage more negative than +0.6
V will be interpreted the same as a legitimate negative applied voltage
(-3 V to -25 V).

INSTALLATION. INTERFACE. AND SPECIFICATIONS

LA120 SPECIFICATIONS
Printer
Printing technique

Impact dot matrix. smart bidirectional

Print matrix (width by height)

7 by 7

Maximum print speed

180 CPS

Horizontal slew speed

60 IPS

Single linefeed time

33 ms

Vertical slew speed

7.5 IPS

Paper feed

Pin-feed. tractor drive

Paper type

Fanfold. up to six parts (see paper requirements)

Forms length

1 to 168 lines

Vertical pitch (lines per inch)

2.3.4.6.8.12

Horizontal pitch (characters
per inch)

180 CPS

10.12.13.2.16.5

90 CPS

5.6.6.6.8.25

Maximum line length
(varies with horizontal pitch)
5 CPI

66 columns

6 CPI

79 columns

6.6 CPI

87 columns

8 CPI

108 columns

10 CPI

132 columns

12 CPI

158 columns

13.2 CPI

174 columns

16.5 CPI

217 columns

Margins

Left. right. top. bottom

Tabs

217 horizontal. 168 vertical. from keyboard or line

Forms storage

True nonvolatile memory (no batteries)

Positioning commands

Horizontal and vertical. absolute and
relative

Character set

ASCII upper/lowercase set

National character sets
Standard

Optional

States
{ United
United Kingdom

{

Finland
Sweden
Norway

Denmark
Germany
France

INSTALLATION, INTERFACE, AND SPECIFICATIONS

APL character set

Optional

Other printer features

Paper out and cover open interlocks,
manual and automatic last character
view, selectable auto new line, self-test
status message, 4-digit numeric display
used as column counter and to set
parameters, factory stored form setup
(10 CPI. 6 LPI. 66 lines per form tab
stops every eight columns, etc.)

Keyboard Specifications
Keyboard

Typewriter style with multi-key
rollover

Selectable auto LF

Standard

Optional numeric keypad

18 keys including 4 function keys

Feature selection

Keyboard entry to nonvolatile
memory

Other keyboard features

Local form feed key, local line feed
key, auto repeat on all alphanumeric
keys, and selectable keyclick

Communication Specifications
Data transfer

Serial. asynchronous

Baud rates (B PS)

50,75,110,134,134.5,150,300,600,
1200,1800,2400.4800,7200,9600.

Split speeds (BPS)

600 or 1200 receive, with 75 or 1 50
transmit; 2400 or 4800 receive, with
300 or 600 transmit.

Parity

Odd, even, or none (8th bit mark or
space transmitted, or data bits only)

Input buffer

1024 characters standard,
characters optional

Interface

Full EIA standard (includes auto answer/disconnect)

Physical Specifications
Dimensions
Width

69.9 cm (27.5 in)

Height

85.1 cm (33.5 in)

Depth

61.0 cm (24.0 in)

Weight
Uncrated

46.4 kg (102 Ib)

Shipping

63.7 kg (140 Ib)

4096

INSTALLATION. INTERFACE. AND SPECIFICATIONS

Physical Specifications (Cont)
Power
Transformer power supply
'Voltage
Frequency

87 to 128 V
60 Hz + 1 Hz

Switcher power supply
Voltage
Frequency

90-128 V or 1 80-256 V
47-63 Mhz

Input current
H eat dissipation - printing

4.2 A max. at 115 V
440 W max.

Temperature
Operating

10° to 40°C (50° to 104° F)

Nonoperating

-40° to 66°C (-40° to 151 ° F)

Relative Humidity
Operating

10 to 90 percent with a maximum
wet bulb temperature of 28°C (82° F)
and a minimum dewpoint of 2°C
(36° F). noncondensing

Nonoperating

5 to 95 percent. noncondensing

Paper Requirements
General

Continuous. fanfold. pin-feed forms

Width

7.6 to 37.8 cm (3 to 14-7/8 in)

Hole spacing

12.7 mm ± 0.25 mm (0.500 in ±
0.010 in) non-accumulative over 5
cm (2in)

Hole diameter

3.81 to 4.06 mrn (0.150 to 0.160 in)

Forms thickness
Single part

15 Ib paper minImum. 0.25 mm
(0.010 in) card stock maximum

Multipart

Up to 6 parts (see notes). 0.50 mm
(0.020 in) maximum

NOTES
1.

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

part.
2.
Multipart carbonless forms up to six parts may be used. Ribbon must be used on
the top copy. First-surface impact paper is not recommended.
3.

Multipart forms with 3- or 4-prong margin crimps on both margins are recom-

mended. 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. Line glue on both margins prevents air from escaping and results in poor impressions.
4.

Split forms with each side containing a different thickness or number of sheets

are not recommended.

CHAPTrE~ 3
f>~OG~AMM[E~ ~NfO~MAT~ON

GENERAL

The LA 120 uses escape sequences standardized by ANSI (American
National Standards Institute) to control many of its features. For LA 120
features lacking an ANSI standard escape sequence, additional escape
sequences are defined within the extensions permitted by the ANSI system.
ANSI has established a flexible and comprehensive system for transmitting format and editing information. It can be used with printing
terminals like the LA 120 and with video terminals and printers and has the
following important advantages:
• It is well defined and well documented. This greatly decreases the
chance of incompatible implementation and aids in achieving device
independence in output.
• It has ample provision for future extension without sacrificing compatibility with older programs. The syntax used in ANSI controls allows
a large number of new controls to be added easily.
• It is compatible with all frequently used communication protocols. In
contrast, many other systems use control codes that are reserved for
communication functions. In these other systems, codes used for line
turnaround, disconnect, and synchronization get confused with those
used to send parameter values.
Using the escape sequences described in this chapter, the programmer
can control the following LA 120 features:
• Printer character set

• Form length

• Active position

• Vertical margins

• Horizontal pitch

• Vertical tabs

• Horizontal margins

• Product identification

• Horizontal tabs

• Line feed new line mode

• Vertical pitch

• Alternate keypad mode

PROGRAMMER INFORMATION

ESCAPE SEQUENCES
The LA 120 interprets escape sequences sent to it. None of the
characters in an escape sequence are printed. When the end of the
sequence is found (or an error occurs), the LA 120 reverts to its normal
printing mode. Control characters (characters with octal codes 000 through
037) may be embedded anywhere in an escape sequence. The control
character performs its normal function and has no effect on the escape
sequence. If an escape sequence is received by the LA 120 that it does not
support, it is ignored.
An escape sequence that has been only partially processed when the
operator enters SET-UP mode will complete when he leaves SET-UP mode.
Escape sequences may also be entered and processed while in local mode
and may be used in lieu of SET-UP commands.
In the lists of escape sequences which follow, the escape character (octal
code 033) is designated as ESC. Numeric parameters are shown explicitly
or designated as n or n l' n 2 , etc. The graphic characters in escape
sequences are shown using the United States ASCII character set. The
characters are spaced apart for clarity only. The space character (octal code
040) never appears in an escape sequence. The case of the characters in
escape sequences is significant and must be exactly as documented.
A numeric parameter is a sequence of ASCII decimal digits. That is, octal
codes 060 through 071. The parameter is interpreted as an unsigned
decimal integer, with the most significant digit transmitted first. Leading
zeros are allowed but are not necessary. A missing parameter is interpreted
as a value of zero. Plus and minus signs are not allowed in parameters.

Printer Character Sets
The LA 120 is capable of receiving and printing both the United States
ASCII character set and the United Kingdom version in which the character
"#" is replaced by the character "£".

The following escape sequences select the printer character sets.
Escape Sequence

Function/Comments

ESC (A

Select character set of United
Kingdom.

ESC(B

Select character set of United
States.

NOTE
The space character (octal
code 040) never appears in
an escape sequence.

PROGRAMMER INFORMATION

The United States ASCII character set is shown below:

CODE
040

CHAR

CODE

CHAR

CODE

CHAR

space

100
101
102

140
141
142

1.43

041
04::!

043
0·44
045

_. :1=

1.03

B
C

104

144

1 ()~i

145

.. ~ &

106
107
110
l1l.
112
11 ~5
114
115

146
147
150
151
152
153
154·
155
156
157
160
161
162
163
164
165
166
167

046
047
050
051
052
O~j3

(
)

*
+

054
O~i5

056
057
060
061
062

116
/

064

1
2
3
4

065

063

066
Ob7
070
07l.
072
073
074
075

c·

l.17
120
121
122
123
124
125

126

127
130
131,
132
133
134
135
136
137

8
9

076

=
).

0"77

'1'"

H
I
J
K
L

M
N
0
P

a
R
S
T
U
V
W

X
Y
Z
-[

.- \
-]

170

171
172
173
174
175
176

f
g

h
i
,j

1
m
n
0
p
G

r
5

t
IJ

v
w
~.~

z
-{

._ I
-}
H

PROGRAMMER INFORMATION

Optional Character Sets
Five additional national character sets and an APL character set are
available as an option. The national character sets are selected by the
operator, using setup commands, or by the programmer using escape
sequences. The national character sets differ from United States ASCII in
only a limited number of code positions.
The code differences among the national character sets are shown
below:

Cha racte T' Set

Code
043

1 ~53

lOO

135
134

174

140

136

176

173

175

United States
United Kinsdom

[

{

}

[

]

{

}

Finland

=I:

<:5

It.

i.j

Sweden

e a
e a

No f'wa';:l/[ienlTla T'''--

;:e

i.j

GerlTlan~

A
U

a
e

F r'ance

The following additional escape sequences select the optional printer
character sets.
ESC (C Finland
ESC (E Norway/Denmark
ESC (H Sweden
ESC (K Germany
ESC (R France
Active Column and Active Line
Active column is defined as the column where the next character will
normally be printed. Active line is defined as the line where the next
character will normally be printed. Column and line numbers begin with
one, not zero. Printable characters normally increment active column.
Linefeeds normally increment active line. Active column and active line are
collectively known as active position.
Active position is only loosely linked to the physical position of LA 120
print head and paper mechanism. In general. the active column is only
recorded when a character is actually printed. Any previous history of active
column values is not significant. The active line is different because it may
only be advanced, since backward paper motion is not allowed. When the
LA 120 is idle, the active and physical positions are identical.
In the LA 120, bell characters have only an active line attribute. They are
not guaranteed to be sounded at any particular column within a line.
In addition to the normal position control characters (space, backspace,
carriage return, linefeed, horizontal tab, vertical tab, and form feed) the
following escape sequences modify active position.

NOTE
The space character (octal
code 040) never appears in
an escape sequence.

PROGRAMMER INFORMATION

NOTE
n represents a numeric parameter.

Escape Sequence

Function/Com ments

ESC [n'

Set active column to column n
(character after n is octal code 140).

ESC [n a

Advance column by n columns.

ESC E

Set active column to left margin and
increment active line.

ESC D

Increment active line (active column
unchanged).

ESC [n d

Set active line to line n.

ESC [n e

Advance active line by n lines.

Linefeed Newline Mode

Linefeed newline mode is controllable both by the operator and the
programmer. If linefeed newline mode is enabled, the characters linefeed,
vertical tab, and form feed each return the active column to the left margin
in addition to their normal functions. Linefeed newline mode may be
enabled by the operator selecting choice 2 (linefeed) in the printer newline
character SET-UP command. The mode is disabled any time the operator
selects choice 1 (none) or choice 3 (carriage return) in the printer newline
character SET-UP command.
The following escape sequences control linefeed newline mode.

Escap~Sequence

Function/Comments

ESC [20 h

Enable linefeed newline mode.

ESC [20 I

Disable linefeed newline mode.

Horizontal Pitch

Horizontal pitch determines the width of printed characters as well as
their spacing. The LA 120 has eight different horizontal pitches. Any
combination of pitches may be used on a single print line. Changing
horizontal pitch modifies the active column. The resulting new active
column is that of the first column boundary at or to the right of the physical
position of the previous active column in the old pitch. It is calculated as:
Newcol = 1 + (Oldcol - 1) Oldpitch
Newpitch
where: Newcol = new active column
Newpitch = new pitch in chars/inch
Oldcol
= old active column
Oldpitch = old pitch in chars/inch
The division performed above is integer division. Any remainder or
fractional part of the quotient is discarded.
The following escape sequences set horizontal pitch.

PROGRAMMER INFORMATION

Escape Sequence

Function/Comments

ESC [w or ESC [ow

10 char/inch

ESC [1 w

10 char/inch

ESC [2 w

12 char/inch

ESC [3 w

13.2 char/inch

ESC [4 w

16.5 char/inch

ESC [5 w

5 char/inch

ESC [6 w

6 char/inch

ESC [7 w

6.6 char/inch

ESC [8 w

8.25 char/inch

Horizontal Margins
Printing is permitted only within the inclusive left and right margins. A
carriage return character sets the active column to the left margin.
Attempting to move the active column left of the left margin sets the active
column equal to the left margin. Attempting to move the active column
more than one column right of the right margin executes an auto-newline
if auto-newline is enabled. If auto-newline is disabled, an error bell sounds
and the character or command which attempted the motion is discarded.
Horizontal margins may be set so long as 1<left margin<right margin<
max column. Note that max column (13.2 inches * horiz pitch) is a function
of horizontal pitch, where the product is rounded down to the nearest
column. The following escape sequences set the left and right margins.
Escape Sequence

Function/Comments

ESC [n s

or ESC [n;Os

Set left margin to column n

ESC [;n s

or ESC [0; ns

Set right margin to column n

ESC [n ; n s
1

Set left margin to column n1 and set
right margin to column n2'

Horizontal Tabs
The LA 120 has 217 possible horizontal tab stops, one for each column.
Tab stops are associated with column numbers, not physical positions on
the paper. Thus, changing horizontal pitch will also change the physical
position of tab stops. Each stop may be set or cleared independently.
Setting a stop already set has no effect; the same is true for clearing a stop
already clear. Tab stops may be set or cleared without regard to margins or
horizontal pitch.

PROGRAMMER INFORMATION

Escape Sequence

F u ncti on/ Co m m ents

ESC H

Set horizontal tab stop at active
column.

ESC 1

Set horizontal tab stop at active
column (see note 2).

ESC [g or ESC Og

Clear horizontal tab stop at active
column.

ESC [2 g

Clear all horizontal tab stops.

ESC [3 g

Clear all horizontal tab stops.

ESC 2

Clear all horizontal tab stops
(see note 2).

ESC [n u

Set horizontal tab stop at column n.

ESC [n , n u
1

Set horizontal tab stops at column
n1 and at column n2.

ESC [n ; n ; .. n u
1

Set horizontal tab stops at columns
n1; n2, .. nx
(x~16).

NOTES
1. n represents a numeric parameter.
2. These escape sequences are available for compatability with the LA 36.

Vertical Pitch
Vertical pitch determines the spacing between lines, not the height of
printed characters. Changing vertical pitch does not affect active line
number; but it does clear vertical margins.
The following escape sequences set vertical pitch.
Escape Sequence

Function/Comments

ESC [z or ESC [Oz

6 lines per inch

ESC [1 z

6 lines per inch

ESC [2 z

8 lines per inch

ESC [3 z

12 lines per inch

ESC [4 z

2 lines per inch

ESC [5 z

3 lines per inch

ESC [6 z

4 lines per inch

PROGRAMMER INFORMATION

Form length
Form length is defined in lines, not physical units. Therefore, changing
vertical pitch will alter the physical form length. Forms may be from 1 to
168 lines in length. Changing form length clears vertical margins and
defines the current line as line one. The following escape sequence sets
form length.
Escape Sequence

Function/Comments

ESC [n t

Set form length to n lines, set top
margin to line 1, set bottom margin
to line n, set active line to line 1.

Vertical Margins
Printing is permitted only on lines within the inclusive top and bottom
margins. When vertical pitch or form length are changed, these margins are
cleared; that is, the top margin is set to line one and the bottom margin is
set to the form length. The following must be true to successfully set new
vertical margins: 1 ~ top margin ~ bottom margin ~ form length. Whenever
active line < top margin or active line> bottom margin, the active line is set
to the top margin. For example, a linefeed performed at the bottom margin
will execute a form feed.
The following escape sequences set the top and bottom margins.

Escape Sequence

Function/ Comments

ESC [n r

Set top margin to line n.

ESC [; n r

Set bottom margin to line n.
Set top margin to line n1 and set
bottom margin to line n2.

Vertical Tabs
The LA 120 has 168 vertical tab stops set and cleared similar to
horizontal tab stops. Vertical tab stops are associated with specific line
numbers, not physical positions on the paper. Thus, changing vertical pitch
changes the printing position of vertical tabs.
The following escape sequences set or clear vertical tab stops.

NOTE
n represents a numeric parameter.

PROGRAMMER INFORMATION

Escape Sequence

Function/Comments

ESC J

Set vertical tab stop at active line.

ESC 3

Set vertical tab stop at active line
(see note 2).

ESC [1 g

Clear vertical tab stop at active line.

ESC [4 g

Clear all vertical tab stops.

ESC 4

Clear all vertical tab stops
(see note 2).

ESC [n v

Set vertical tab stop at line n.

ESC[n,;n 2 v

Set vertical tab stops at line n1 and
at line n2.

Set vertical tab stops at line n1, n2,

... nx (x < 16).
PRODUCT IDENTIFICATION
The LA 120 terminal automatically transmits an answer to the AN SI
standard request for a device attributes escape sequence.
The following escape sequence causes the LA 120 to transmit its product
identification escape sequence.
Escape Sequence

Function/Comments

ESC [c or ESC rOc

LA 120 transmits ESC [ ? 2 c

NOTES

1. n represents a numeric parameter.
2. These escape sequences are available for compatability with the LA 36.

Alternate Keypad Mode
Alternate keypad mode allows application programs to differentiate
between keystrokes performed on the optional numeric pad and those
performed on the main keyboard so that the numeric pad may be used for
commands or special functions.
Alternate keypad mode is controllable by the operator using the alternate
keypad mode SET-U P command, or by the programmer. If alternate keypad
mode is disabled, the keys on the optional numeric keypad transmit the
codes that correspond to the keycap legends. If alternate keypad mode is
enabled, each of these keys transmits the escape sequence specified below.
The following escape sequences control alternate keypad mode.
Escape Sequence

Function/Comments

ESC =

Enable alternate keypad mode.

ESC>

Disable alternate keypad mode.

80 PROGRAMMER INFORMATION

Code Transmitted
Alternate
Keypad Mode

Key

Normally

PF1
PF2
PF3
PF4

ESCO P
ESC 0 Q
ESC 0 R
ESC 0 S
Same as
RETURN key

ESC 0 P
ESC 0 Q
ESC 0 R
ESC 0 S
ESC 0 M

, (comma)
- (dash)
. (period)
(number)
1

ESC 0 I
ESC 0 m
ESC 0 n
ESC 0 P
ESC 0 q

2
3
4
5
6

ESC 0 r
ESC 0 s
ESC 0 t
ESC 0 u
ESC 0 v

7
8
9

7
8

ESC 0 w
ESC 0 x
ESC 0 Y

ENTER

Control Characters
The LA 120 receives the following control characters and responds
accordingly.
Code

Mnemonic

Name

000
003
004
005
007

NUL
ETX
EOT
ENQ
BEL

Null
End of Text
End of Transmission
Enquiry

010
011
012
013
014

BS
HT
LF
VT
FF

Backspace
Horizontal Tabulation
Line Feed
Vertical Tabulation
Form Feed

Bell

PROGRAMMER INFORMATION

Code

Mnemonic

Name

015
016
017
020

Carriage Return
Shift Out
Shift In
Data Link Escape

030

CR
SO
SI
DLE
CAN

032
033
177

SUB
ESC
DEL

Substitute
Escape
Delete

Cancel

Control characters not listed above are always ignored when received by
the LA 120.
Null or Delete (NULL or DEL)
Null and delete characters cause no operation. But they are different
from ignored characters in that they are disposed of without occupying
space in the input buffer. Thus they are fill characters and truly equivalent
to idle marking time.
End of Text (ETX)
If the LA 120 is operating in half dupex with ETX turnaround, the end of
text character is recognized as the turnaround character. If the LA 120 is
operating in any other full or half duplex mode, the ETX character has no
effect.
End of Transmission (EOT)
If the LA 120 is operating in half duplex with EOT turnaround, the end of
transmission character is recognized as the turnaround character. If the
LA 120 is operating in any other full or half duplex mode, the EOT character
is recognized as a disconnect request, unless the auto disconnect feature is
turned off. For disconnect request in half duplex with EOT turnaround, see
Data Link Escape (DLE»
Enquiry (ENQ)
The LA 120 automatically transmits its answerback message upon
receipt of ENQ.
Bell (8 EL)
The bell character sounds a momentary 2400 Hertz tone. No more than
eight bells can be pending at anyone time.
Backspace (85)
The backspace character decrements the active column, unless the
active column is at the left margin, in which case the backspace character
is ignored.

PROGRAMMER INFORMATION

Horizontal Tab (HT)
The horizontal tab character advances the active column to the next
horizontal tab stop greater than the current active column but no greater
than the right margin. If there is no such tab stop, the active column is
advanced to the column after the right margin.
Line Feed (LF)
The line feed character increments the active line, unless the active line
is at the bottom margin, in which case it sets the active line to the top
margin of the next page. If linefeed newline mode is enabled, the active
column is set to the left margin.
Vertical Tab (VT)
The vertical tab character advances the active line to the next vertical tab
stop greater than the current active line but no greater than the bottom
margin. If there is no such tab stop, the active line is set to the top margin
(on the next page). If linefeed newline mode is enabled, the active column
is set to the left margin.
Form Feed (FF)
The form feed character advances the active line to the top margin of the
next page, which mayor may not be the physical top of form. If linefeed
newline mode is enabled, the active column is set to the left margin.
Carriage Return (CR)
The carriage return character returns the active column to the left
margin. If carriage return is selected as the printer newline character, the
active line is incremented.
Shift In (SI)
The shift in character shifts the printer to the primary character set. If no
secondary character set (such as APL) is installed, this character has no
effect.
Shift Out (SO)
The shift out character shifts the printer to the secondary character set.
If no secondary character set (such as APL) is installed, or if alternate
character set is disabled, this character has no effect.
Data Link Escape (OLE)
If the LA 120 is operating in half duplex with EOT turnaround, the data
link escape character, when received or transmitted immediately prior to an
EOT, causes the EOT to be interpreted as a disconnect request. If the
LA 120 is operating in any other full or half duplex mode, the D LE character
has no effect.
Cancel (CAN)
The cancel character terminates any pending escape sequence and
causes the sequence to be ignored.

PROGRAMMER INFORMATION

Substitute (SU B)
The substitute character is interpreted as being in place of a character
received in error. Characters received with parity errors are converted to the
SUB character. If characters are ever lost due to input buffer overflow, a
SU B character is placed in the input buffer at that point. The SU B character
is printed as the following graphic symbol:
~~

The SU B character also has the effect of a cancel character.
Escape (ESC)
The escape character is interpreted as introducing an escape sequence.
Escape sequences are described in detail in their own section of this chapter.
APL Character Set
If the alternate character set SET-UP feature is enabled, the optional APL
character set can be selected by the SO control character, independent of
the national character set in use. The SI control character returns the printer
to the previously selected national
character set.
For the APL keyboard to work properly the keyboard character set must
have been set by the operator to United States or United Kingdom.

CODE

CHAR

CODE

CHAR CODE

040
041
042
043
044
045
046
047
050
051
052
053
054
055
056
057
060
061
062
063
064
065
066
067

space

070
071
072
073
074
075
076
077
100
101
102
103
104
105
106
107
110
111
112
113
114
115
116
117

8
9

=
)

J
v
1\

+
/
0

1
2
3
4

5
6

(
[

;
x

a
..l.

n
L
€
'il

\
0

0
I
T

120
121
122
123
124
125
126
127
130
131
132
133
134
135
136
137
140
141
142
143
144
145
146
147

CHAR CODE
:k

?
F

r
H

'u"

w
:J

t
c
fo

I-i

1
+
¢
A
Ie

c
II

F
G

150
151
152
153
154
155
156
157
160
161
162
163
164
165
166
167
170
171
172
173
174
175
176

CHAR
H
I

.J
K

L
M

N
0
F·
G
f;:

u
v

w
:·c
.,..
z
{

;
}

PROGRAMMER INFORMATION

Sample Form SET -U P Using Escape Sequences
All form control features available to the operator in SET-UP mode can
also be transmitted to the LA 120 using escape sequences. The form
illustrated in Chapter 2, Part 2 could be set up using the following escape
sequences.

Escape Sequence

Function/Comments

ESC 1 z

Selects 6 lines per inch.

ESC 6 6 t

Sets form length to 66 lines and
sets top-of-form at current line.

ESC 4; 5 8 r

Sets top margin at line 4 and
bottom margin at line 58.

ESC 4 g

Clears all vertical tabs.

ESC 8; 2 0; 2 5; 4 5 v

Sets vertical tabs at lines 8, 20, 25,
and 45.

ESC 1 w

Sets horizontal pitch to 10 characters per inch.

ESC 3; 8 2 s

Sets left margin to column 3 and
right margin to column 82.

ESC 2 g

Clears all horizontal tabs.

ESC 1 0; 2 1; 4 1 u

Sets horizontal tabs at columns 10,
21 and 41.

Synchronization
When the LA 120 receives a character (other than the fill characters, NUL
and DEL), it stores it in its 1000 character input buffer. When the printer is
ready, characters are fetched from the input buffer and printed. If the printer
falls behind by more than about 1000 characters, the input buffer overflows
and data is lost. There are three ways to avoid buffer overflows.
1. Send data only as fast as it can be printed. When receiving data at
1200 baud or less, the LA 120 can keep up with normal character
sequences. Very short lines and multiple form feeds cannot be printed
this fast. Fill characters may be used to slow the effective data
transmission speed in these cases. Fill time formulas are given below.
2.

Limit the length of your message to the LA 120's input buffer size. If
the buffer is empty at the beginning of your transmission, you can
send a message of about 1000 characters without worrying about
buffer overflow.

3. Use a terminal synchronization protoco\' such as XON/XOFF or
restraint mode. Using a synchronization protocol, the LA 120 can tell
the data source when to pause in sending data and when to resume.
Synchronization allows maximum throughput and elimates the need
for fill character calculations and message size limits.

PROGRAMMER INFORMATION

When synchronization is used. the LA 120 constantly monitors the
number of characters stored in its input buffer. When the number of
characters exceeds a "high water mark." the LA 120 signals the data source
to pause temporarily. Meanwhile. the printer continues to take characters
out of the input buffer. When the number of characters remaining is less
than a "low water mark." the LA 120 signals that transmission may resume.
The values used for the high and low water marks are selected by the buffer
control SET-UP command.
The LA 120 also sends a pause signal when the printer is not ready due
to error conditions or operator actions. Running out of paper or detecting a
print head jam can cause a pause request to be sent. The operator can
induce a pause request by opening the cover or entering SET-U P mode.
The pause and resume signals to the data source are sent either or both
of two ways:
1. Using the control characters XON (octal code 021) and XO FF (octal
code 023)
2. Using the EIA signal SRTS in restraint mode.
Restraint mode operation is suited for local, hard-wired installations. especially when the LA 120 is used as a serial line printer replacement. Restraint mode is selected using SET-UP commands: "S:" (secondary
channel) must be "1" (enabled) and "M" (modem/protocol) must be "1"
(full duplex. no EIA controls).
XON/XOFF is suitable for either local or remote operation. so long as the
connection is full duplex. To select XON/XOFF operation the "X" SET-UP
must be set to" 1" (enabled). The XON/XOFF protocol is complicated by the
fact that the synchronization characters may be interspersed between the
characters typed at the LA 120 keyboard. The operator can tell the data
source to pause by typing XOFF (CTRL-S) and to resume by typing XON
(CTRL-Q). To make sure that neither the buffer controller's nor the
operator's pause requests are lost. typed characters may be transmitted
with an XO FF character immediately following.
If XON/XOFF is enabled the LA 120 transmits XON when first powered
up and transmit enabled.
Synchronization Limits
Low limit
",,>, ~",,', """'>">" """

50 chars
256 chars
Fill Time Formulas
Horizontal Movement
Includes horizontal tabs and horizontal positioning escape sequences.
First convert to actual number of columns moved. then allow 1 5 ms for
each of the first ten columns (30 ms in double-width pitches) and 5.5 ms
for each additional column (11 ms in double-width pitches).

PROGRAMMER INFORMATION

Vertical Movement
Includes line feeds, vertical tabs, form feeds, and vertical positioning
escape sequences. First convert to actual number of lines moved, then
allow 33 ms for the first line moved up to 1/6 inch and 135 ms for each
additional inch.
Keyboard Operation
The LA 120 operator's console contains a typewriter-style keyboard
resembling an office typewriter in key size, shape, and location. The
keyboard also contains a 4-digit numeric display and 8 binary indicators.
There is provision for an optional, field installable numeric keypad.
The operator uses the keyboard to transmit codes. If the LA 120 is
transmit-enabled, codes are transmitted as each key is pressed except
during auto repeat activity or with certain combinations of three or more
keys held down which cannot occur in normal touch typing. If the LA 120
is not transmit-enabled keystrokes are stored in a 16-character buffer for
future transmission. If more than 12 keystrokes are in the buffer, each
keystroke generates a 400 Hertz tone to indicate that the buffer is full or
nearly full. The buffer will be cleared without transmission any time SET-UP
mode is entered or exited, line/local status is toggled, or a break is
transmitted.
Auto Repeat
If auto repeat is enabled and a key that generates the space, backspace,
or delete code or any printable character code is held down for more than
0.6 second, the code for that key is transmitted repeatedly at 7.5 characters
per second, gradually increasing to 25 characters per second, or at a rate
determined by the baud rate, whichever is slower. If auto repeat is in
process, all keystrokes are ignored until the repeating key is released. If
more than one key is held down prior to the start of auto repeat. only the
last key pressed is subject to auto repeat.
Printable Character Keys
There are 47 keys that generate printable character codes. The relationship between these keys and the SHIFT and CAPS LOCI< keys is such that
each of the 26 alphabetic keys transmits the lowercase code unless either
or both of the S HI FT keys a re down, or the CA P S LO C I< key is down. Each
nonalphabetic key generates two different codes. One code is generated if
neither S HI FT key is down. The other code is generated if either or both of
the SHIFT keys are down. Unlike the SHIFT LOCK key of a typewriter, the
CAPS LOCI< key does not affect the nonalphabetic keys. The codes for
each code generating key are shown below.

PROGRAMMER INFORMATION

Octal Codes Generated by Keyboard
(Shifted Codes Shown Above Legends;
Unshifted Codes Shown Below Legends)

D
033
ESC [!]41
1!
033
061

~OO
2 @ []ZJ43
3 # [1Z]44
4$
062

063

064

00000
~1&

065

[1ZJ36
Clli50
G:TI53
6 /I. DlJ46
7 & a:J52
B *
9 ( D:k]51
0) [!]37
-= + [11]76
\ - stACE
066
067
070
071
060
055
075
140
010

crJ
1lf1fl11~3111g41f1fl11g71~f1YlrJ3]f1Fl1 ~~211 O~~ I 015
011

21
Q
161

G£J27
[!]31
[!]11
[TI'7P
[!]20 [!]73
W CIJ05
E [!]22
R [!]24
T
Y [!]25
U
lO
II G:J75
II
167
145
162
164
171
165
151
157
160
133
135

177

~
~~~~
0 ~~
1¥lf1¥lf1g3l~~~~~~~1I
1.l!illliZ2JLillJ~l!kJ~~~liiJL&lL--.J
01.
163

144

147

073

047

MA3386

Control Character Keys
There are seven keys that generate control character codes. The codes
generated by these keys are independent of the SH I FT and CAPS LOCK
keys.
Key

Octal Code

Function

RETURN
LINE FEED
BACI< SPACE
TAB
SPACEBAR
DELETE
ESC

01 5 or 01 5 01 2
012
010
011
040

CR or NL
LF or NL

177

033

BS
HT
SP
DEL
ESC

In coded control half duplex. the R ETU R N key transmits the turnaround
character automatically after transmitting its normal code or codes.
CTRL (Control) Key
The CTR L key is used in conjunction with certain other keys on the
keyboard to generate control character codes. The CTR L key is also used
in conjunction with the SET-UP key to enter SET-UP mode.
The codes generated and keys affected by the CTR L key are independent
of the SH I FT and CAPS LOCI< keys. It is never necessary to hold both the
key and the SH I FT key down in combination with another key to
generate control character codes. Also. there is only one CTRL key
combination for each of the 32 control characters. Because of these

PROGRAMMER INFORMATION

requirements, there are three control characters whose locations on the
LA 120 may differ from other terminals. These characters and their location
on the LA 120 and other terminals are shown below.
Code

LA120

Other Terminals

NUL

(000)

I~ii't, 1- SPACE BAR

EJ-EJ-fJ]

RS
(036)

EJ-IT]

EJ-EJ-[I]

US
(037)

EJ-EJ-[J

The characters and codes generated by each key when the CTR L key is
held down are shown below.

Characters Generated by Keyboard
with CTRL Key Held Down
(Mnemonics Shown Above Legends;
Octal Codes Shown Below Legends)

DODD

MA3387

PROGRAMMER INFORMATION

Optional Auxiliary Keypad
The optional auxiliary keypad contains 18 keys that transmit the codes
for the characters or escape sequences specified in the escape sequences
section of this chapter.
BREAK Key
Pressing the B REAl< key causes the LA 120 to transmit a short break
signal to 233 ms duration.
Holding one or both shift keys down and pressing the BREAK key causes
the LA 120 to transmit a long break disconnect signal of 3.5 seconds
duration.
The interface leads involved in transmitting break signals are described
in Chapter 4.
VIEW Key
If automatic view is in use and the printer has been idle, but has not yet
timed out the automatic view delay time, pressing the VI EW key causes the
view operations to be performed.
If automatic view is not in use, pressing and holding the VI EW key
causes the print head to idle at the viewing position. With the VI EW key
released, the print head idles at the ready to print position.
When there is no character to print, the carriage moves to the print cell
immediately to the left of the cell designated by the active position (ready
to print position). If the printer remains idle longer than the automatic view
delay time, the carriage moves to the right to facilitate viewing of the last
character printed (viewing position).
The automatic view delay time is a function of keyboard activity. If
characters are being typed at a touch typing rate or faster, the time is set
long enough to prevent erratic carriage motion. Otherwise it is set to
provide instant visibility of single typed or received characters. The
automatic view operation may be disabled by the operator using a SET-UP
command (SET-UP Z).

Communication

CHA~T[E~ ~

C(Q)MMUN~CAT~ONS

FULL DUPLEX (FOX)
There are two modes of full duplex operation: with EIA control and
without EIA control. While on-line, both modes allow simultaneous transmit
and receive with the LA 120 generating signals DTR and RTS. Full duplex
with EIA control subjects the line to connection requirements and disconnect conditions. In full duplex without EIA control, transmission and receive
are always enabled if on-line.
Full Duplex Connection Requirements
In full duplex with EIA control, the following conditions must be satisfied
before the LA 120 allows transmission and reception of data to occur:
1. DS R must be asserted; then the LA 120 asserts RTS.
2. RLSD must be asserted for at least 300 ms after DSR is asserted;
then the LA 120 enables transmission and reception.
Full Duplex Break
In full duplex, a break consists of a 233 ms space on the transmit data
line if transmission is enabled. If transmission is disabled, the break remains
pending until transmission is enabled or disconnect is generated.
Full Duplex Disconnect Conditions
Hanging up the phone to disconnect from the line is accomplished by
dropping DTR for 70 ms and resetting all control lines to their initial state.
Three line conditions cause a disconnect:
1. Connection is not established within 20 seconds of a ring indication.
(Connection is defined as the assertion of DSR and RLSD.)
2. When initiating a call, and RLSD is not asserted within 5 seconds.
3. Connection is established, and RI asserts, DSR drops, or RLSD drops
for 5 seconds.

COMMUNICATIONS

A command can also initiate a disconnect. An EOT from the keyboard or
line will hang up the phone. When a disconnect is initiated from the
keyboard, the EOT is sent to the remote end before the disconnect in order
for the remote end to also disconnect. Also, a long break disconnect can be
generated from the keyboard. This produces a space on the transmit data
line and DTR drops for 3.5 seconds.
Restraint Mode vs Speed Control Mode
With either full duplex mode selected, restraint mode or speed control
mode, but not both, may be in use. In restraint mode, the LA 120 controls
the SRTS line to signal an approaching input buffer overflow. This function
is analogous to XON/XOFF. This signal represents the status of the input
buffer only, not a receive ready state. Both DTR and S RTS must be
observed to determine the receive state of the LA 120.
In speed control mode, the SPDI and SPDS lines exchange speed
information between the LA 120 and the modem. The LA 120 asserts S PDS
if the operator-selected baud rate is 1200 or higher.The LA 120 forces an
operating baud rate of 1200 baud if SPDI is asserted from the modem.
These speed selects are intended for use with modems such as the Bell
212A that are capable of 103 type operation at low speeds but use a
different modulation technique at high speeds.
HALF DUPLEX (HDX)
Due to the "one at a time" definition of half duplex, elaborate protocols
(compared to full duplex) are needed to define whether the LA 120 should
transmit or receive data at any given time. Each time the transmitter and
receiver exchange functions the line is "turned around." Basically this
consists of switching the end of the line that asserts RTS, which reverses
the transmit/receive mode of the modem and switches the carrier generation from one end to the other. Also, when echo suppressors are on the
line, it is necessary to turn them around in order to attenuate in the opposite
direction. The LA 120 incorporates three methods of controlling line
turnaround. In supervisory control mode the host controls all line turnarounds by manipulating the secondary control lines. Reverse channel is
mandatory for this mode. The two other protocols (coded control with
reverse channel and coded control without reverse channel) allow the
transmitting device to control line turnaround using specific control
characters. If reverse channel is used, these lines provide confidence as to
the fate of the transmitted data. Without these signals the transmission is
"blind."
Initial Direction Determination
When LA 120 is initially put on-line, data cannot be transmitted or
received. When the LA 120 is called, RI asserts before DSR. In auto answer
mode most modems answer the call (go off hook) before asserting DSR.
However, some modems allow DSR to assert after a couple of rings but
before the call is answered. With this sequence the LA 120 attempts to
establish receive mode. If the LA 120 operator is initiating the call, DSR
asserts when the modem is placed in data mode. Since DSR is asserted
without RI, the LA 120 attempts to enter either transmit or receive mode,

COMMUNICATIONS

depending on the H DX initial state SET-U P command. If the LA 120
attempts to enter receive mode and RLSD is not asserted within 5 seconds,
the normal timeout disconnect occurs.

Reverse Channel
Reverse channel transmits supervisory or error control signals. These
signals flow in the opposite direction from which data is being transferred.
Due to the relative lower bandwidth of the reverse channel (to the forward
channel). it is not used for data exchange.

Modem Delay
When the host sets RTS, the LA 120 sees the change as asserting RLSD.
Conversely, when the host drops RTS, the LA 120 sees the change as
dropping RLSD. However, there is delay between dropping RTS by the host
and the loss of RLSD by the LA 120. This delay is dependent upon the
modem. For example, a 2028 modem validates RLSD for 23 ms (7 ms for
fast mode timing option) before setting the R LSD present signal. Also the
loss of R LSD is signaled 10 ms after the modem detects the drop. The
secondary channel responds like the primary channel but between SRTS
and SRLSD.

Request to Send Delay
As noted in the RLSD definition, the analog loopback option turns
around certain lines to the LA 120:
1.

RTS asserted causes RLS D to be true,

2. SRTS asserted causes SRLSD to be true,
3. Receive data mimics transmit data (local copy).
For this reason whenever RLSD or SRLSD is to be used, 300 ms must
have elapsed since the local driving force (RTS or SRTS) has been removed.
Up until that time the signals do not represent the remote end. Also, RTS
should not be lowered until the last character is completely serialized
(transmit complete).

Turnaround Characters
The two turnaround characters, EOT and ETX, initiate line turnaround
when received or transmitted. Any characters sent after the turnaround
character are lost. The LA 120 automatically sends the turnaround character
each time the RETURN key is typed, after sending the normal code for that
key.

Half Duplex Break
Half duplex break operates in three modes:

1. Transmit mode (RTS true)-a space on the transmit data line for 233
ms.
2: Received mode (RTS false)-a space on the SRTS line for 233 ms.
When operating with 'coded-no reverse channel' the break is ignored
when in receive mode.
3. While switching modes-if neither receive nor transmit is enabled
the break is not processed until a definite line direction is established.

96 COMMUNICATIONS

Loss of Data Set Ready
When DSR is lost, all control lines are set to their initial state.
Half Duplex Disconnect
Hanging up the phone to disconnect from the line is accomplished by
dropping DTR for 70 ms and resetting all control lines to their initial state.
There are five line conditions that will cause a DTR disconnect:
1. Line connection not established within 20 seconds of a ring
indication. (Connection is defined by the assertion of DST and RSLD.)
2. When initiating a call with reverse channel and S RLS D is not
asserted within 5 seconds.
3.

Line turnaround not complete within 5 seconds.

4. In coded control RLSD or SRLSD lost for 5 seconds without the
turnaround character. If no reverse channel, only RLSD is monitored.
5. Valid line direction established and RING asserts or DSR drops.
In addition, a command can be used to initiate a disconnect. An EOT or
DLE-EOT from the keyboard or line will hang up the phone. If EOT is used
as the turnaround character, DLE-EOT must be used as the disconnect
command. When a disconnect is initiated from the keyboard, the EOT or
D LE/EOT is sent to the remote end before the disconnect in order for the
remote end to also disconnect.
A long break disconnect can be generated from the keyboard. This
produces a space on the transmit data line and drops DTR for 3.5 seconds.
MODEM SET-UP FEATURE DESCRIPTION
General
The LA 120 modem feature offers five different communication choices.
Choices 1 and 2 are full duplex; 3, 4, and 5 are half duplex. For each choice
there are several possible combinations of SET-U P features. The following
is a description of each modem choice, followed by a table illustrating the
modem choices ih combination with other applicable SET-U P features.
Modem 1
This full duplex choice is used when there are no meaningful modem
signals being sent to the LA 120, with the exception of receive data. With NOTE
this choice the LA 120 constantly asserts DTR and RTS. The primary If modem=1, the modem
situations for this mode are:
will not recognize paper out,
head jam, cover open, or any
1. Current loop interface on LA 120
other disconnect associated
2. Full duplex modems or acoustic couplers where data set ready or with data terminal ready.
carrier detect are not available.
Modem 2
This full duplex choice supports a full modem interface. Some of the
equipment commonly used in this mode are:
1. Bell 103 modems and acoustic couplers/modems that emulate 103
modems with regard to DSR, carrier, and ring

COMMUNICATIONS

NOTE
Local Echo (SET-UP E)Most full duplex systems
(hosts) echo the character
keyed back to the terminal
to print it. However, this is
totally a host system configuration parameter, not a
function of the full or half
duplex communication link.
If the system does not echo
the characters keyed, local
echo should be enabled.

2. Vadic 3400 full duplex modems
3.

Bell 212A modems (see Speed Control information in this chapter).

In this mode DTR is always asserted, except during the 70 ms or 3.5
second disconnects (described previously in Full Duplex Hang Up). The
terminal is not ready to receive or transmit until a valid terminal/modem link
is established using the proper modem signals.

Half Duplex
The following three half duplex modes require a Bell 202C, 202S, or
equivalent modem/acoustic coupler. SET-UP M defines the actual protocol
to control line turnaround. Proper protocol is totally dependent on the host
computer. The following questions should be asked of a knowledgeable
host computer representative.
1. Is turnaround controlled by the host (supervisory) or are control codes
used to control the line (coded) control? If supervisory is used, set
modem=3 and skip questions 2 and 3. If coded control ask:
2. Which character is used for turnaround?
If the character is EOT set modem=4.
If the character is ETX set modem=5.
3. Is the secondary channel used?
Yes - set S=1
No - set S=O.
Modem 3
This is the first of three half duplex modes, commonly referred to as
supervisory mode. The host controls all line turnarounds by controlling the
primary and secondary channels. The LA 120 responds by switching
between receive and transmit states and indicating that state to the host.
No turnaround characters are sent or interpreted with this mode. Secondary
channel is mandatory for this mode, therefore SET-U PSis ignored.
Modem 4
In this half duplex mode, line direction is controlled by the transmitting
devide. When an EOT is sent from the transmitter (host or terminal), both
ends change state. An EOT is sent after a carriage return code is sent via
the R ETU R N key on the L 120. This causes a turnaround without the operator entering the control code. A disconnect is generated whenever a
DLE/EOT pair is received or transmitted.
Modem 5
The final half duplex mode is basically the same as modem 4, but the
ETX character controls line turnaround. This character is transmitted for
each line turnaround and is appended to a carriage return code generated
via the RETU RN key. A disconnect is generated whenever an EOT is received or transmitted.

COMMUNICATIONS

Summary of Modem Features

LA120 SET-UP Features

Buffer
Control

XON/
XOFF

Auto
Disconnect

Local
Echo

HDX
Initial
Calling
State

(FDX no
Off
modem.
XON/XOFF
enabled)

As
required

Enabled

Off

As
required

No
effect

As
required

1 (FDX no Off
modem.
XON/XOFF
disabled)

No
effect

Disabled

Off

As
required

No
effect

As
required

2 (FDX
As
required
modem.
XON/XOFF
enabled)

As
required

Enabled

As
required

No
effect

As
required

2 (FDX
As
required
modem.
XON/XOFF
disabled)

No
effect

Disabled

As
required

No
effect

As
required

3 (HDX
modem)

As
required

No
effect

Disabled

As
required

No
effect

As
required

4(HDX
modem)

As
required

No
effect

Disabled

As
required

5 (HDX
modem)

As
required

No
effect

Disabled

As
required

Modem
Setup
Choices

Auto
Answerback

EFFECTS OF PAPER OUT
The LA 120 operates normally until the physical end of paper passes the
print head; then printing ceases. If the data source is using XON and XOFF,
no data is lost. If auto disconnect is enabled, the data terminal ready signal
becomes unasserted during the paper out and recovery interval. If break is
enabled, a break signal is sent when the paper out condition occurs. The
possible paper out actions as function of auto disconnect (O), break enable
(U), and XON/XOFF enable (X) SET-U P commands are shown below.
X=1
U=O or 1

X=O
U=1

X=O
U=O

0=0

XOFF

Break

No action

0=1

XOFF
then OTR Low

OTR low

Secondary
Channel

Break
Action

Options

CHA~T[EfS

Of>T~ONS

20 rnA LA 12X-AL
The 20 mA loop option allows the terminal to communicate directly with
the computer up to a distance of 305 m (1000 ft) without the use of a
modem.
Installation
The 20 mA LA 12X-AL option kit contains the following items.
Item

Qty.

Description

Part No.

1
2
3

1
1
1
2

BC05F
AD-7016059-0-0
AD-7016186-0-0
9009988-08

20 mA external interface cable
20 mA assembly (logic board)
20 mA harness assembly
Screw, hex-head slotted
#8-32. 0.38 long
Washer, lock, ext. tooth #8

9008072-00

Install the 20 mA option as described in the following steps:
1. Set the TRANS switch on the 20 mA assembly to the NORMAL
position. (If the LA 120 must provide current to the transmit line, set
the switch to the ACT position.)
2. Set the REC switch to the NORMAL position. (If the LA 120 must
provide current on the receive line set the switch to the ACT
position.)
3. Lower the rear cabinet door on the LA 120.
4. Disconnect and remove any previously connected plug from J8 on
the logic/power board.
5. Slip the 20 mA assembly (2) up through the hole in the floor of the
cabinet. Secure with two hex-head screws (4) and washers (5).
6. Connect the 20 mA harness assembly (3) between the jack on the 20
mA logic board (2) and J8 on the logic/power board.
101

102

OPTIONS

7. Place the LA 120 in SET-UP mode. Select and store the following
features:
Modem= 1 (FDX, no modem)
Auto Disconnect=O (OFF)
8. Connect P 1 of the 20 mA external interface cable to the bottom
connector on the 20 mA logic board.

TRANS

REC

~::~~
~MAL~

PINNING
FROM

P1·2
P1·3
P1·5
P1·7

P2·3
P2·2
P2·7
P2·5
MA·2320

OPTIONS

103

Test After Installation
After the LA 120 is connected to your system you should send and
receive data to verify the installation.

Electrical Characteristics
Transmitter

Min

Open circuit
5.0V
voltage
Voltage drop
marking
Spacing current
Marking current 20mA

Min

Max

Receiver

50V

Voltage drop
marking

2.5 V

Spacing current
Marking current 15 mA

3.0mA
50mA

4.0 V
2.0mA
50mA

Pin Assignments
1 - Test Negative
2 - Transmit 3 - Receive 5 - Transmit+
7 - Receive+
8 - Protective ground

900000000F

123

20m A CURRENT
LOOP CONNECTOR
MA3380

LA12X-DL EXPANDED BUFFER
Typically a printer receives a series of characters, temporarily stores the
characters in a buffer, and then prints the characters one at a time. The
LA 120 contains a standard 1000 character buffer. This option enables the
standard 1000 character buffer to be increased in size to 4000 characters
(4K).
An example of the use of this option is an LA 120 connected to a video
terminal (VT100) whose screen contains 24 lines at 132 characters per line
(total of 3168 characters). The LA 120 could receive these characters at
9600 baud, store all 24 lines in the buffer, and then print the characters at
the printing speed of the LA 120 (180 characters per second).
The LA 120 buffer control feature (see operator's information) is not
affected by this option. If XON XOFF, and large buffer is selected, XOFF will
still be generated around 600 characters. The only difference is that the
buffer is now 4000 characters instead of 1000 characters.
If XON XOFF, or the equivalent is not used, and the system is operating
at high baud rates (for example 2400 baud) for long periods, it may be
possible to exceed the 4K buffer capacity.

Suppl~es and Accessor~es

CHAf'T[E~ (5

SUP~l~[ES aJrad ACC[ESSO~~[ES

GENERAL
All DIGITAL printer terminals offer improved quality printing and formshandling versatility. DIGITAL offers a variety of supplies to enhance
terminal reliability and make operation easier.
DIGITAL's dye-based ribbon is specifically matched to the print head and
eliminates the abrasive problems of carbon and clay based ribbons. Carbon
based ribbon tends to wear print head wires and eventually causes poor
character legibility. Precise matching of ribbon material and printing
methods lengthens print head operating life.
DIGITAL has the paper needed to accommodate up to 132-column print
capability and miltipart paper adjustments. To eliminate costly printer
downtime associated with improperly stacked paper, DIGITAL offers paper
collectors that increase printer and operator efficiency by automatically
folding and stacking fanfold paper.
LAXX-KB Casters
This set of casters attaches to the rear of the cabinet and facilitates
terminal mobility.
LAXX-NC Paper Basket
The paper basket neatly collects and stacks printer paper as it feeds
through the printer. The steel constructed unit is 30.5 cm long, 40.6 cm
wide, and 33.0 cm high (12 inches long, 16 inches wide, and 13 inches
high). It holds up to one complete box of paper. It is shipped with brackets
and instructions for easy attachment.
LAXX- KD Wire Shelf
The wire paper shelf collects fanfold paper as it feeds through the printer.
The shelf is 26.7 cm long, 45.7 cm wide, and 5.1 cm high (10-112 inches
long, 18 inches wide, and 2 inches high). No tools or screws are required
for attachment. Instructions are included.

107

10S

SU PPLI ES AN D ACCESSO RI ES

LAXX- KC Work Surface Shelf
The durable surface shelf attaches to either the left or right side of the
terminal and provides convenient workspace to accommodate data printouts, printer paper, manuals, etc. The shelf is 61 cm long and 3S.7 cm wide
(24 inches long and 15-1/4 inches wide). It is shipped with the necessary
bars, screws, and instructions for easy attachment.
LAXX- KA Accessories Kit
The kit includes the following accessories:
1 LAXX-KB caster set
1 LAXX-KD work surface shelf
1 LAXX-KD wire shelf
The kit is shipped with the necessary brackets, screws, and instructions
for easy attachment.
H981-A Copy Holder
The copy holder improves efficiency, accuracy, and typing speed by
furnishing space for viewing reference data at eye level. The copy holder
clamps on a disk or table. Minimum eye movement is required as the
flexible arm adjusts to the desired position. Attach the copy holder to the
LAXX-KC work surface shelf for convenient data reference while using the
printer.
12-12375 Dust Cover
The clear vinyl dust cover protects the terminal when not in use.
36-09141-00 Paper
Single-part, white, lined, fanfold, 132-column, 14-7/8 x 11 inches,
2000 sheets per box.
36-09829 Paper
Single-part, white, lined, fanfold, 80-column, 9-7/8 x 11 inches, 2000
sheets per box.
36-05361 Paper
Single-part, white, lined, fanfold, 72-column, 8-1/2 x 11 inches, 2000
sheets per box.
Multipart Forms
All forms are white, lined, fanfold, 14-7/8 x 11 inches.
36-09141-01 - 2-part (1600 sets/box)
36-09141-02 - 3-part (1000 sets/box)
36-09141-03 - 4-part (750 sets/box)
36-09141-04 - 6-part (500 sets/box)
36-12153-01 Ribbon
DIGITAL-specified nylon ribbon produces excellent print quality and
lengthens print head operating life. Ribbon measures 0.5 inch wide by 60
yards long. Ribbons come individually sealed, 12 per box.

SUPPLIES AND ACCESSORIES

109

Manuals
The following manuals are available to support your LA 120.

Title

Order Number

Contents

LA 120 Operator
Reference Card

EK-LA 120-RG

Summary of SET -U P
features

LA 120 Pocket Service
Guide

EK-LA 120-SV

Field Service
maintenance information

LA 120 Maintenance
Manual

EK-LA 120-MM

Detailed theory of
operation and
maintenance information

LA 120 User Guide

EK-LA 120-UG

Operator, installation,
programming, and
communication
information

Ordering
Purchase orders for supplies and accessories should be forwarded to:
Digital Equipment Corporation
Supplies and Accessories Group
Cotton Road
Nashua, New Hampshire 03060
Contact your local sales office or call DIGITAL Direct Catalog Sales tollfree (800-258-1710) from 8: 30 a.m. to 5:00 p.m. eastern standard time
(U.S. customers only). New Hampshire customers should dial (603) 8846660. Terms and conditions include net 30 days and F.O.B. DIGITAL plant.
Freight charges will be prepaid by DIGITAL and added to the invoice. Minimum order is $35.00. Minimum does not apply when full payment is submitted with an order. Checks and money orders should be made out to
Digital Equipment Corporation.

110

SUPPLIES AND ACCESSORIES

OTHER TERMINALS
The terminal is the vital link between the user and the power of the
computer. The right terminal or the enhancement to your terminal can make
your work easier, more efficient. and more cost effective. For that reason,
DI GITAL offers a full range of video and teleprinter terminals and options
that can help you tackle any application.

Video Terminal
For the ultimate in video terminals, look to DIGITAL VT100. It combines
exceptional versatility with simplicity of operation. And it's designed to
allow a wide range of fast and easy field upgrades to meet your changing
needs.
There's a detached typewriter-style keyboard with a flexible 3-wire
coiled cord. An 18-key numeric/function keypad on the keyboard permits
single keystroke control of application-specific functions. The VT100 fits
easily on a standard typewriter table. There's an advanced video option that
provides 132-column lines on the screen for easy viewing of wide-line
printer reports. Double height/double width characters are selectable line
by line for easier reading and text formatting. Smooth scrolling a scan at a
time lets your operators read new lines at a reasonable speed. Dividedscreen displays; blinking, underlining, double intensity, and normal or
reverse video character attributes; keyboard and/or computer-settable tab
stops; built-in self-test diagnostics; pictorial capability; and many, many
more.

Intelligent Video Terminal
At the head of the VT100 class are DIGITAL'S intelligent PDT-11 terminals. The PDT family includes three programmable data terminals: the
PDT-11/110, the PDT-11/130, and the PDT-11/150. With their PDP-11
compatible processors and RT -11 operating system, the PDTs permit you
to draw on a wide range of existing software.
Local mass storage is available on the PDT -11/130 in the form of 524K
bytes of storage provided in dual mini cartridges. Housed within the same
VT100 shell. these mini cartridges are file-structured system devices. The
PDT-11/150 lets you combine the functionality of the PDT-11 with the
dual floppy disk storage of any DIGITAL terminal. With its four ports, the
11/150 allows considerable system expansion. Add a terminal controller if
you want the flexibility of up to four terminals. For hardcopy, add a printer
to the printer port. There's a third port for an EIA link to a host computer.

LA34/LA38 DECwriter IV
Everything about the 300 baud desktop terminals adds up to convenience. They are smaller, lighter, and quieter than many typewriters. They
have sculptured, typewriter-like keys, and a cartridge, for simple ribbon
changes. All features are set at the keyboard, including four character width
adjustments. They also have automatic self-test diagnostics.

Reader's Comments

LA 120 User's Guide

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etc.? Is it easy to use?

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Does it satisfy your needs?

Why?

Please send me the current copy of the Technical Documentation Catalog, which contains information on the
remainder of DIGITAL's technical documentation.

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A
Accessories ........................................................... 103
Acoustic coupler ..................................................... 94
Active column ......................................................... 74
Active line ................................................................ 74
Active position ........................................................ 74
Alarm indicators ........................................................ 9
ALT CHAR SET light.. ............................................... 3
Alternate keypad mode .................................. .46,79
ANSi ......................................................................... 71
Answerback ............................................................. 36
Entering message ..............................................37
Jumper ................................................................ 62
Transmitting message ...................................... 36
APL character set ................................................... 83
Auto answerback.................................................... 37
Auto disconnect. ..................................................... 40
Auto line feed ..........................................................42
Auto new line at right margin .............................. .41
Auto repeat ........................................................ 30,86
Auto repeat rate ......................................................30

C
Cabling .....................................................................63
EIA ....................................................................... 63
20mA current 100p ............................................ 99
CAPS LOCK key ........................................................ 6
Carriage adjustment lever. ....................................... 8
Characters per inch ................................................25
Example ..............................................................25
Selection .............................................................25
Checkout procedure ............................................... 62
Clearances, installation .......................................... 59
Comfort featu res .................................................. 103
Communications features ..................................... 32
Console,operator's ................................................... 2
Control characters ......................................... 5,80,87
Cover interlock switch .............................................. 7
Cover open ...............................................................60
CTRL key .............................................................. 6,87
CTS (clear to send) light. .......................................... 3
Current loop interface ............................................94

B
BACK SPACE key ..................................................... 5
Baud rate (speed) ................................................... 34
Bell ........................................................................... 6,9
Approaching right margin ................................ 10
Generating code for .......................................... 80
Indications ............................................................. 9
Volume ................................................................31
BREAK key ........................................................... 6,89
Control .................................................................38
High water mark ................................................ 38
Low water mark ................................................. 38
Overflow ..............................................................92

D
Data bits, number of ..............................................44
Data Set Ready ....................................................... 63
Loss of .................................................................94
DELETE key ................................................................ 5
DSR (data set ready) light ....................................... 3

E
EIA ............................................................................63
ENTER key ................................................................. 7
ESC key ....................................................................... 5
Escape sequences ............................................ 72,75

113

114

F
Factory stored settings .......................................... 50
Fill characters ..........................................................84
Fill time formulas .................................................... 85
Foreign character sets ..................................... 66,74
Form feed code, generating ............................ 80,82
Form length .............................................................78
Form setup example ..............................................84
Form setup sample ................................................. 16
Full duplex ...............................................................90
Full duplex break .....................................................91
Full duplex hang up ................................................ 90
Fuse, AC ............................................................. 11,55

H
Half duplex ................................................... 43,92,95
Half duplex break ....................................................93
Hang up phone line ................................................94
Head gap .................................................................. 54
Headjam .................................................................... 9
HERE IS key ............................................................... 3
High water mark ..................................................... 38
Horizontal form adjustment ............................ 27 ,29
Horizontal margins ........................................... 27,76
Clearing ...............................................................28
Setting right ........................................................28
Setting left ..........................................................28
Horizontal pitch .......................................................75
Horizontal tabs ........................................................76
Clearing all ..........................................................29
Clearing single ....................................................29
Setting .................................................................29

L
Last character view (LCV) .....................................31
Lights .......................................................................... 3
Alt Char Set ........................................................... 3
CTS (clear to send) ............................................... 3
DSR (data set ready) ........................................... 3
Local ....................................................................... 3
On Line .................................................................. 3
Paper Out .............................................................. 3
Set-Up ................................................................... 3
LIN E FEED key .......................................................... 4
LIN E/LOCAL key ....................................................... 3
Lines per inch .......................................................... 19
Example .............................................................. 19
Selection ....................................................... 19,20
Line feed newline mode ........................................ 75
Loading paper/forms ............................................. 55
Local echo ................................................................41
LOCAL FORM FEED key ......................................... 3
LOCAL light ............................................................... 3
LOCAL LIN E FEED key ........................................... .4
Low water mark ...................................................... 38

M
Modem .....................................................................42
Modem control protocols ...................................... 91
Modem setup feature description ........................ 94
Modem, summary of features .............................. 96
Modems ...................................................................95
Bell Telephone ................................................... 95
Vadic 3400 ......................................................... 95
Multipart forms ..................................................... 104

N
Initial calling state (HDX) ......................................92
I nitial direction determination .............................. 92
Installation and configuration ............................... 59
I nte rfaces .................................................................63
EIA .......................................................................63
20mA current loop ............................................ 99

K
Key click ...................................................................32
Keyboard character set ..........................................39
Baud ....................................................................... 5
Clear All ................................................................. 4
Left/Top Mar. ........................................................ 4
Mar Clear ............................................................... 5
Recall/Store .......................................................... 5
RtiBot Mar ............................................................ 5
Status ..................................................................... 5
Tab Clear ............................................................... 4
Tab Set ................................................................... 4
TOF (top of form) ..................................................4

Numeric display ......................................................... 3
Numeric keypad ........................................................ 7

o
ON LIN E light ............................................................. 3
ON/OFF, power switch ............................................ 7
Operator comfort features .................................... 30
Operator reference card ........................................ 13
Operator troubleshooting table ............................ 11
Operator's console ...... :............................................. 2
Optional character sets .......................................... 7 4
p

Packing procedures ................................................ 61
Paper adjust knob ..................................................... 8
Paper/Forms ............................................................ 55
Initial loading ...................................................... 55
Reloading ............................................................ 56
Paper/Forms loading ............................................. 55
Paper, out of ............................................................ 96

115

PAPER OUT light ...................................................... 3
Parity. setting and checking .................................. 44
Parity symbol ...........................................................44
Permanently stored settings ................................. 51
PF1. PF2. PF3. PF4 keys ......................................... 7
Power ON/OFF switch ............................................. 7
Print impression adjustment. ................................ 54
Print character set ............................................ 39.72
Printer new line character .....................................45
Product identification ............................................. 79
Protocol. communications .................................... 91

R
Recall settings ......................................................... 51
Restraint mode ....................................................... 92
RETURN key .............................................................. 5
Reverse channel ..................................................... 93
Ribbon installation ................................................. 54
RS232C ................................................................... 63

W ..........................................................................45
X ...........................................................................45
y ...........................................................................46
Z ............................................................................31
SET-UP key ................................................................ 4
SET-UP label ........................................................... 52
SET-UP light ..............................................................3
SET-UP mode ......................................................... 18
SHIFT keys ................................................................. 6
Site considerations ................................................. 59
Space bar ................................................................... 5
Specifications .......................................................... 66
Speed control mode ............................................... 92
RS232 ................................................................. 63
EIA .......................................................................63
Status message ......................................................52
Store settings .......................................................... 51
Store. recall and status featu res .................... 49.51
Supplies ................................................................. 103
Synchronization ......................................................84

S
Sample form ............................................................ 16
Illustration ........................................................... 16
Using setup commands .................................... 18
Using escape sequences ...................................... .
Secondary channel .................................................43
Self test ....................................................................53
Nonprinting .........................................................53
Printing ................................................................53
Sample printout ................................................. 53
SET-UP commands. by letter .................................. ..
A ...........................................................................37
B ...........................................................................38
C ........................................................................... 40
D ...........................................................................40
E ........................................................................... 41
F............................................................................ 20
G ...........................................................................31
H ...........................................................................26
1............................................................................. 50
J ............................................................................ 41
K ...............................................................22.25.32
L............................................................................42
M ............................................................. .r............ 42
N ..................................................................... 39.47
0 .....................................................................47.48
P ........................................................................... 44
Q ........................................................................... 43
R ...........................................................................30
S ........................................................................... 43
T........................................................................... '.53
U ...........................................................................48
V ........................................................................... 19

T
TAB key ...................................................................... 5
Tabs ..........................................................................27
Horizontal ........................................................... 27
Vertical .......................................................... 22.24
Temporarily stored settings .................................. 49
Testing and troubleshooting ................................. 10
Top of form ......... ,................................................. 4.21
Tractor adjust knobs .................................................8
Troubleshooting ...................................................... 10
Turnaround characters ........................................... 93
U
Unpacking and inspection ..................................... 60

V
Vertical forms adjustment ................................. 8.22
Vertical margins .......................................... , ..... 22.78
Clearing ............................................................... 24
Setting bottom ................................................... 23
Setting top ..........................................................23
Vertical pitch ........................................................... 77
Vertical tabs .......................................................24.78
Clearing all .......................................................... 25
Clearing single .................................................... 25
Setting ................................................................. 23
VIEW key .............................................................. 7.89
Voltage Selector Switch ..................................61
Volume. bell ............................................................. 31

x
XO N/XO FF ..............................................................45

NOTES

INSTALLATION, WARRANTY, AND SERVICE INFORMATION

IN ST A LLA TI N/W A R RAN TV
For customers who have purchased directly from DIGITAL, reference the sales agreement for installation and
warranty terms purchased with this terminal,
For customers who have purchased, leased, or rented from a vendor other than DIGITAL. contact your vendor
for information regarding installation and warranty terms purchased with this terminal,
DIGITAL SERVICES
A wide range of maintenance and customer services are available from DIGITAL for your terminal, Through
use of these services, you can design a plan which meets your service needs, from complete DIG ITAL maintenance to complete self-maintenance. VeQdors supplyill9 DIG ITAL products may use these services as factory
backup support.
• On-Site Service
DIGITAL offers responsive, low cost factory-level maintenance performed at your site by trained Terminals Service Specialists through:
• Service Agreements which cover all your maintenance needs to include priority response; all labor,
materials and travel for a fixed monthly charge.
• Per Call Service which is provided on a "time" and "materials" basis and can serve as a back-up to
your own in-house maintenance programs.
• Off-Site Service
For those customers who have a significant level of troubleshooting expertise, but require Field Service
assistance for the repair of components, DIGITAL has established a worldwide network of Product
Repair Centers (PRCs) and the Customer Returns Area (CRA). Through a wide array of service product
offerings this logistics network offers cost effective services to include:
• Module Mailer™
• Fixed Price Exchange
• Product Refurbishment
• Spare Parts
In an effort to further assist those customers who choose to perform their own computer maintenance,
DIGITAL's Customer Spares organization is committed to providing thorough and timely spares support
through:
• Spares Inventory Planning
• Comp.onent/Subassembly Spares
• Maintenance Test Equipment
• Maintenance Documentation Service
• Emergency Spare Parts
• Traihing
DIGITAL offers hardware maintenance courses through the Educational Services group at any of our 17
worldwide training centers; or depending on your specific training requirements, courses can be provided
in your own facilities.
• Terminal Supplies
DIGITAL offers a variety of supplies to enhance terminal reliability and to make operation easier. Everything from furniture accessories, (cabinets, tables, etc.) to terminal supplies, such as paper, ribbons,
diskettes, cassettes, labels, and many other items, as illustrated in the Supplies Brochures, are available
through DIGITAL and may be obtained by dialing the toll-free number below. All orders may be placed
via the toll-free number (800-258-1710) and will be processed within 24 hours (U.S. only - with the
exception ~f Hawaii and Alaska).
To obtain further information concerning any of the customer services available, fill out the attached card or
write:
DIGITAL EQUIPMENT CORPORATION
129 Parker Street
Maynard, MA 01754
ATTN: Customer Services Marketing - PK3-2/S25