IBM 3774 Manual

Systems
GA27-3094-3
File No. S370-09

l ;
\
' '
~
Systems
GA27-3094-3
File No. S370-09
Operating
Proced1Jres Guide:
IBM
3174
and
3775
Communication
Terminals

Preface
This Operating Procedures Guide is directed to operators of the IBM 3774 and 3775
Communication Terminals (non-programmable models), and to personnel writing job
application procedures for these terminals.
Because the
IBM 3774 and 3775 terminals are used in many applications, detailed
procedures for processing each job cannot be presented here. This guide describes the
purpose and use
of the terminal's controls as they apply to all jobs. You can use this
manual
in preparing a detailed operator procedure for a specific job in your application.
Users
of this manual who need more information about the functions and features of the
terminals should refer
to the 3770 System Components manual; this manual and other
publications
that may be useful to you are listed under "Related Publications" in the
front of this manual.
The information in this manual
is organized as follows:
• Chapter 1
is an introduction to the 3774 and 3775 Communication Terminals.
• Chapter 2 contains the 3774 and 3775 operating procedures, and includes exercises
for becoming familiar with operation
of the terminals.
• Chapter 3 contains procedures for resuming operation following a machine halt or
error interruption, and
gives guidelines for determining when to request service.
• Chapter 4 through
11 contain procedures for making the various input and output
devices ready for operation, and for correcting problems such
as card jams.
• Appendix A provides reference information for emulating
IMB 2770 Data
Communication System workstation functions.
• Appendix Bcontains procedures for running communication tests.
• Appendix C
is a summary of the 3774 and 3775 keyboard keys, lights, and switches.
Fourth Edition (May, 1976)
This
is a major revision of, and obsoletes, GA27-3094-2. Changes or additions to the text and
illustrations are indicated
by a vertical line to the left of the change.
Changes are periodically made
to the information herein; any such changes will be reported in sub-
sequent revisions or Technical Newsletters. Before using this publication in connection
with the
operation
of IBM systems or equipment, refer to the latest System/370 Bibliography (Order No.
GC20-0001) and associated Technical Newsletters for the edition
that is applicable and current.
Requests for copies
of IBM publications should be made to your IBM representative or to the IBM
branch office serving your locality.
This manual has been prepared
by the IBM System Communications Division, Publication Center,
Department EOl, P.O. Box 12195, Research Triangle Park, North Carolina 27709. A
form for reader's
comments
is provided at the back of this publication. If the form has been removed, comments may
be sent to the above address. Comments become the property of IBM.
©Copyright, International Business Machines Corporation ,1974, 1975, 1976
"'
.,
'' }
\~

-·
t I - __
~I
Related Publications
Summary
of Amendments
• IBM 3770 Data Communication System-System Components, GA27-3097
• IBM
3774 and 3775 Communication Terminals ReferenceSummary, GA27-3095
• General Information-Binary Synchronous Communications, GA27-3004.
• Synchronous Data
Link Control General Information, GA27-3093
• IBM
Remote Multiplexers and Communications Terminals Installation Manual-
Physical Planning, GA27-3006
• Printer Forms
Layout Sheets, GX20_- 1816
• Forms Design Considerations----System Printers, GA24-3488
• IBM System/370 Bibliography, GC20-0001
• Planning
and Installation of a Data Communication System Using IBM LineAdapters,
GA24-3435
• IBM Data Processing Glossary, GC20-1699
• IBM 3872 Modem User's Guide, GA27-3058
• IBM 3874 Modem User's Guide, GA33-0002
• IBM 4872 Modem Model
1, GA36-0001
• IBM
4872 Modem Models 2 and 3, GA36-0004
Second Edition (January, 1975)
The operating procedures were changed to indude how to define and start a job that
uses the Record Format Control feature. Error codes for the Record Format Control
feature were added to the numeric position readout (NPR) codes in Chapter 3.
Appendix C provided a summary listing
of the terminal's switches, keys, and lights.
Third Edition {October, 1975)
This edition incorporated TNL GN27-3167 and added information about operation using
Synchronous Data
llnk Control (SDLC). Corrections, additions, and clarification were
made thioughout the manual.
Fourth Edition (May, 1976)
This edition incorporates corrections and editorialchanges throughout the manual,
and includes additional information about operation using SDLC.
iii

I )
'·'-/

I,
I
\...__.i./
•
I
\~
Contents Chapter
1.
Introduction .
The Basic Terminal Components
The Controller .
The Console Printer
Serial Console Printer (for
the
IBM
3774 Communication Terminal)
Line Console Printer (for
the
IBM
3775 Communication Terminal)
The Keyboard and Operator Panel
The Diskette Storage Device .
The Auxiliary Operator Panel .
Chapter 2. Operating Procedures
Overview
of
IBM 3774 and
IBM
3775 Communication Terminal Operation
Operation Exercises
Exercise Nwnber 1: A Keyboard-to-Diskette-Storage Device
Job
Exercise Number
2:
A Diskette-Storage-Device-Console Printer Job .
Power On/Off Procedures
Power On
Power
Off
Remote Power
Off
Forms
Control
.
Entering
an
Operator Defined Job From the Keyboard
To Define a
Job
From
the
Keyboard .
Entering
an
Operator Defined Job From the Card Reader .
Writing Operator Defined Jobs to
the
Diskette Storage Device
Entering Operator Defined Jobs
From
the
Diskette Storage Device
Starting a Job Using
BSC
•
Communication Line Jobs--BSC .
Starting a Job Using SDLC
Communication Line
Jobs-SD
LC
Terminating a Communication Line Job
Transmit Request
to
the
CPU .
Keyboard-to-Line Jobs
Switched Communication (Dial) NetworkProcedures
Initiating a Call .
Answering a Call
Automatic Answer
Example No. 1: Starting a System Defined Disk
to
Line Job
Example No. 2: Starting an Operator Defined Disk
to
Line
Job
Ending a
Job.
Ending Keyboard
to
Output
Device Jobs
Ending Card Reader
to
Output
Device Jobs •
Ending Diskette Storage Device
to
Output
Device
Jobs
Stopping a
Job
Before Normal
Job
End
Using the.Operator Panel Indicators .
Input
and
Output
Device Indicators
CPU SELECT Indicator
PRINT INHIBIT Indicator
OPRN CHECK (Operation Check) Indicator
SYSTEM CHECK Indicator
ON LINE Indicator .
STANDBY Indicator
PROCEED Indicator
UPPER CASE Indicator
Using
the
Operator Panel Switches
HOLD PRINT Switch .
INTRP (Interrupt) Switch .
When
the
Interrupt Switch Is Off .
When
the
Interrupt Switch Is On .
Interrupt Feature System Considerations
EXTEND/ALARM Switch
Using
the
EXTEND/ALARM Switch With Keyboard Jobs
Using the EXTEND/ALARM
S~itch
With Jobs Other Than Keyboard
Jobs.
Contents
l-1
1-3-
1-3
' ' I I
1-3
1-3
1-3
!~-
1·5·
2-1
2-1
2-2-
2-2 '
2-3 • •
2-4
2-4
2-4-
2-4
2-5
• •
2-6
2-6
2-12
2-18-
2-18
'
2-19
2-23
2-25
2-28-
2-29
2-29
I
2-29
2-30
;~;6-
2-31
I
2-32
2-32
2-32
2-33-
2-33
2-33
2-34
2-36
2-36
2-36
2-36
2-36
2-37
;~;~-
2"37 •
2-37
2-38
2-38
2-38-
2-38
2-39 I
2-39
2-40
;~~-

vi
AUTO Switch .
Using
the
AUTO
Switch With Keyboard Jobs
Using the
AUTO
Switch With Diskette
to
Console Printer Jobs
Using the AUTO Switch With Keyboard to Card Punch Jobs .
DISK Switch.
UPDATE/MONITOR Switch •
Using the UPDATE/MONITOR Switch With Keyboard
To
Diskette Jobs
Using the UPDATE/MONITOR Switch With Jobs Other Than Keyboard Jobs .
Using the CODE Key .
CODE Key Functions .
Extended CODE Key Functions
Using the Keyboard Buffer Edit Keys
Using the Keyboard Buffer Edit Keys: Exercise No.
1.
Using the Keyboard Buffer Edit Keys: Exercise No.
2.
Using
the Keyboard Buffer Edit Keys: Exercise No.
3.
Description
of
Buffer Edit Keys .
BUFFR RTN (Buffer Return) Key
BUFFR LINE RETURN Key .
BUFFR BKSP (Buffer Backspace) Key
PRINT BUFFR Key
PRINT Line Key
PRINT CHAR Key
RESETKey .
CNCL (Cancel) Key
Description
of
Control Keys Used During Keyboard Entry
PRINT VIEW Key
RESETKey .
FORM FEED Key
VERT
TAB
(Vertical Tab) Key
INDEX Key .
Diskette Storage Device Jobs
Diskette Labels .
Diskette Records
Active and Inactive Data Set Status
Multivolume Data Sets .
Defective Diskette Sectors .
Entering Keyboard Data on Disk
Updating a Diskette Record
Updating a Diskette Record During a Keyboard-to-Diskette Job
Operation
With
Two Diskette Storage Devices
Diskette Interchangeability
(.'hapter 3. Error Recovery and Problem Identification
Overview
of
Error Recovery and Problem Identification Procedures .
Restarting a Job Following an Error •
Requesting Maintenance on the Terminal
Printing the Error Log .
Using
the Trouble Report Form .
Numeric Position Readout (NPR) Codes .
Diskette Data Recovery Procedures .
Section 1: General Data Recovery Procedure
Section 2: Diskette Failure During Read Operation
Section
3:
Diskette Failures During Write Operation
Problem Identification Procedures
Error Recovery Procedure
How to Perform Communication Tests
To Perform Test 0 (Terminal Communication Test)
To Perform Test 2 (Modem
Wrap
Test) .
To Perform Test 3 (Modem Transmit Test)
To Perform Test 4 (Modem Receive Test)
2-40
2-40
2-41
2-41
2-41
2-41
2-42
2-42
2-44
2-44
2-50
2-52
2-52
2-54
2-54
2-55
2-55
2-55
2-55
2-55
2-55
2-55
2-55
2-55
2-56
2-56
2-56
2-56
2-56
2-56
2-57
2-57
2-58
2-59
2-59
2-60
2-60
2-61
2-62
2-62
2-63
3-1
3-1
3-1
3-1
3-2
3-2
3-3
3-17
3-17
3-18
3-18
3-19
3-19
3-20
3-20
3-20
3-21
3-23

\ ' J
.._,,,
...
i
~:
Chapter 4. 3774 Console Printer
Make Ready Procedure .
General Operating Information
Installing and Aligning Printer Forms .
Loading Cut Forms
in the Printer .
Loading Margin-Punched Forms Using the Forms Tractor .
Loading Single-Part Continuous Paper-Friction Feed
Using the Pressure Feed Bail
Aligning Forms to the First Print Line
Setting the Print Position Indicator
Installing or Removing the FormsTractor
To Install the Forms Tractor .
To Remove the Forms Tractor
Changing the Ribbon
Removing and Installing the Platen
Removing the Platen
Installing the Platen •
Chapter 5. 3775 Console Printer
Make Ready Procedure .
General Forms Handling Information
Installing and Aligning Printer Forms.
Loading Forms in the Printer .
Aligning Forms to the First Print Line
Replacing the Ribbon .
Removing the Ribbon
Installing the Ribbon
Replacing the Print Belt
Removing the Print Belt
Installing the Print Belt .
Chapter
6. Diskette Storage Device
Make Ready Procedure .
Diskette Handling
Chapter 7.
IBM 2502 Card Reader
Make Ready Procedure •
To Unload the Stacker .
To Unload the Stacker (Before Full)
To Unload a Full Stacker .
To Reload the Hopper .
To Reload the Hopper (Before Empty)
To Reload an Empty Hopper .
To Set
Up for Short Cards-51 or 66 Column
To Remove a Card Jam .
Jam
at the Cornering Station or the Read Station
Jam Between the Read Station and the
Stacke~ .
Chapter 8. IBM 3501 Card Reader
Make Ready Procedure .
Operating Procedures
Reloading the Hopper or Unloading the Stacker
Removing a Card Jam .
Chapter 9.
IBM 3521 Card Punch
Make Ready Procedure .
Operating Procedures
Reloading the Hopper or Emptying the Stacker .
Emptying the Chlp Box
Removing Card Jams
Replacing the Inkroll
Cleaning the Typedrum•
Using the Status Indicators. ·
4-1
II
4-1
4-2 II
4-3
4-3
4-6
4-8
4-10
ti
4-12
4-12
4-12
4-12
4-12
4-13 a
4-14
4-14
4-15
5-1
ti
5-1
5-1
5-2
5-2
5-3
5-6
II
5-6
5-6
5-9
5-9
5·10 fl
6-1
6-1
6-4
7-1
Cl
7-1
7-2
7-2
7-2
7-3
fl
7-3
7-3
7-4
7-6
7-6
ti
7-6
8-1
8-1
8-3
~3-
8-3 : '
9-1
9-1
9-3-
9-3
9-3 I
9-4
9-6
::;411
Contents vii
ti

viii
Chapter 10. Operator iD (Identification) Card Reader.
Reading ah Identification Card
Chapter
U.
I~M
3784Line
Printer
IBM
3784 Line Printer Operating Pr6cedures
Make Ready Procedure •
Operator Panel Switches and Indicators
Installing and Aligning Printer Forins .
Replacing the Ribbon .
Replacing the Print Belt
Appendix
A.
Efuulating
IBM
2770 Workstation
Jobs
Introduction .
Defining and Sl\lfting an
IBM
2770 Workstation Job
Defining an.IBM 2770 Workstation Job
Starting an
IBM
2770 Workstation Job
OS/VSl
!ills
Operator Notes
OS/VS2 (JES2) Notes .
IMS/VS Operator Notes
Appendix B. Test Procedures .
Commilnicatfon Test Procedures
Ste~
l:
Run Test 0 {TerminalCommunication Test)
Step 2: Run Test 2 (Modem Wrap
T11st)
.
Step
3:
Run Test 3 (Modem Transmit Test)
Step 4: Rurt Test.4 {Modem Receive Test) .
Error Count buririg Normal transmission Charts
Modem Transmit Equalization
Modein Receive Equalii.ation .
Using the Communication Test Adapter Cable
Binary Synchronous Communications Online Test
To
Enter Online Test Mode
Requesting Online Test
01
on
a Switched or Non-Switched Point-to-Point
Communication Network •
Requesting Online Test
14
on
a
Switched
or
Non-Switched Point-to-Point
Communication Line .
Requestirig Qnline Test
on
a Multipoint Communication Network
SDLC Commurucations Online Echo Test
Appendix
C.
Summary
of
Operator Controls
Auxiliary Operator Panel Controls
Operator Panel Switches
Operator Panel Keys
Operator Panel Lights
Index .
10-1
10-1
11-1
11-1
11-1
11-1
11-4
11-7
11-10
A-1
A-1
A-2
A-2
A-2
A-3
A-4
A-6
B-1
B-1
B-1
B-2
B-3
B-4
B-4
B·.'.i
B-5
B-6
B-8
B-8
B-8
B-9
B-9
B-'10
C-1
C-1
C-2
C-3
C-6
X-1
..
.
\
\~)

I ,
\_),I
\
••
,.,..Ji
List
of
Illustrations
1-1.
1-2.
1-3.
1-4.
1-5.
2-1.
2-2.
2-3.
2-4.
2-5.
3-1.
3-2.
3-3.
3-4.
4-I.
4-2.
4-?.
4-4.
4-5.
4-6.
4-7.
4-8.
4-9.
4-10.
4-11.
5-l.
5-2.
5-3.
5-4.
5-5.
5-6.
5-1.
5-8.
5-9.
s-io.
s-ti.
5-12.
6-1.
6-2.
6-3.
7-1.
7-2.
7-3.
&-1.
&-2.
8-3.
9-L
9-2.
9-3.
9-4.
9-5.
10-1.
11-1.
11-2.
11-3.
11-4.
11-5.
11-6.
11-7.
11-8.
11-9.
11-10.
11-11.
11-12.
B-1.
IBM
3774
Comnrnnkation
Terminal
IBM
3775
Communication
Terminal
IBM
3774
and
3775
Data
Path.
Keyboard
anq
Operator
Panel .
Auxiliary
Operator
Panel .
Example
of
a Keyboard"to-piskette
Job
Defined
From
the
Keyboard
Card
FQrm1J,t
for
an
Operator
Defined Job .
Example
of
Card
Format
for
Operator
Defined
Jobs
Using
the
CODE Key
Buffer Ecjit Keys
Trouble
Report
Form
Typical Modem
Connector,
Telephone
Equipment
Connector,
and
Modem power Plug
Modem Panel Showing Meter
and
Transmit Equalizer
Control
Modem Panel Showjllg Equalizer
Controls
Operator
Controls
.
Opening
the
Printer Cover
The
Forms
Tractor
Unit
Insta~ing
Cut
Forms
Paper
Routing
Using
the
Forms
Tractor
Installipg Margin-Pu,hched
Forms
.
Paper
Path
for
Friction
Feeding .
Uslng
the
Pressure
Feed
Bail .
Installing
th~
Forms
Tractor
Unit
.
Ribbon
Path .
~emoving
and
Installing
the
Platen
Printer
Locations
Qpenlng
the
Printer Cover .
Print Unit Qpen/Close .
Opening Upper
Forms
Guide
Inserting
Forms'.
Plac@g'Forms
on
Tractor
Pins
Raisipg
Ribbon
Guides
'.
Ribbon
Cassette Removal .
Installing
the
Ribbon
Releasing Print Belt Tension
Removing Print Belt
Installing
the
Print
Belt
Opening
the
Diskette
Device Door
Removing/Inserting a
Diskette.
Closing
the
Diskette Device
Door
.
2502
Make
Ready
Procedure .
2502
Short
Card
Setup
Procedure
2502
Card
Jam
Removal
3501
Make
Ready
Procedure
Removing a Card
Jam
.
Closing
the
Read Head Cover
3521 Make Ready Procedure
Emptying
the
Chip
Box
Removing a Card
Jam
at
the
Hopper
Removing a Card
Jam
in
the
Card
Path
Area .
Replacing
the
Ink
Roll .
ID (Identification) Card Reader
IBM
3784
Line Printer .
Opening
the
Printer Cover •
Print
Unit
Open/Close .
Opening Upper
Forms
Guide
Inserting
Forms
.
Placing
Forms
on
Tractor
Pins
Raising
Ribbon
Guides .
Ribbon
Cassette Removal/Installation
Installing
the
Ribbon
, .
Releasing Print Belt Tension
Removing
Print
Belt
Installing
the
Print
Belt
Test Adapter Cable .
-
1-1
1-2
1-211
1-4
'•
I I
1-5
2-11
2-13
2-17-
2-44
2-52
••
3-2
3-19
3-22-
3-25
• •
4-1
4-4
4-5
4-5-
4-6
4-7 • •
4-10 '
4-11
4-1311
4-14
4-16
I
5-1
?,
5-2
;~:-
5-5
. ·
I .
5-5
'
5-6
.
5-7
5-7-
5-9
5-9
I
5-lQ
'
6-1
~~;·fl.·.
7-1
7-5
.
7-7
8-1
8-3-
8-4
I
9-1
9-3
9-4
9-5-
9-6
10-1
·.
:
11-2
11-4
~~.~;
ti
11-6
I
11-7
11-8
11-8
11-9
.11-10
.11-11
.11-12
.
B-6
Wt
ofillu•ratiom
h<
41

•
..
i
\..........._/
Chapter 1. Introduction
Figure 1-1 illustrates a typical IBM 3774 Communication Terminal, and Figure 1-2 illus-
trates a typical
IBM 3775 Communication Terminal. Additional input and output devices
(such
as a card reader or a card punch) are added when required by the application. The
input and output device chapters thatfollow (starting with Chapter 4) describe the opera-
ting procedures for these
devic.es.
Figure 1-3, IBM 3774 and 3775 Data Path, illustrates the path of data when running a
job on the terminal. A job
is a unit bf work on the terminal; for example, transferring
punched card data from a card reader to the terminal's console printer. The "Overview
of IBM 3774 and 3775 Communication Terminal Operation" section that starts Chapter
2 summarizes the steps in running ajob on the terminal: (
1) Power on, (2) Define the
job's input and output device combination and features, (3) Start the job, and (4) End
the job.
The basic components section that follows summarizes the function
of the components
in a typical terminal configuration.
Use the System Components manual for a more
detailed description
of the terminal's functions and capabilities.
Diskette Storage Device No. 1
Figure 1-1. IBM 3774 Communication Terminal.
IBM 3774 and 3775 Operatin~ Procedures Guide 1-1

1-2
Auxiliary Operator Panel
(Includes KEY LOCK Switch,
and ID Badge Reader)
Diskette Storage Device No. 2
Figure 1-2, IBM 3775 Communication Terminal
1. You select the job's input and output device combination when you define and start a job as
described in chapter 2.
2. Data from the job's input device transfers to the controller.
3. Temporary data storage areas (buffers) in the controller store the data for transfer to the
job's output device.
4. First buffer fills, second empties
INPUT:
Keyboard
Card Reader
Diskette No. 1
Diskette No .. 2
Communications Line
5. Second buffer fills, first empties
INPUT:
Keyboard
Card Reader
Diskette No.
Diskette No. 2
Communications Line
Figure 1-3. IBM 3774 and 3775 Data Path
Buffer
Buffer
Buffer
Buffer
,
I
I
_J
OUTPUT:
Diskette No. 1
Diskette No. 2
Console Printer
Line Printer
Card Punch
Communications
line
OUTPUT:
Diskette No. 1
Diskette No. 2
Console
Printer
Line Printer
Card Punch
Communications Line
''-)

i. '
'-.,../
"
l .
~
The Basic Terminal Components
The Controller
The Console Printer
• The controller controls the transfer ofinformation between the system's input and
output devices.
• You select the input and output devices for a specificjob when you define or start a
job.
• Two temporary storage areas (buffers)
in the controller store information transmitted
from the input device, and transfer the information to the output device.
• The buffers alternate in
use between input and output. At any one time, one buffer is
dedicated to input and the other to output. When the input buffer fills and the output
buffer empties, they exchange functions. This arrangement allows the overlap
of input
and output operations. For example, when entering keyboard information for transfer
to the Diskette Storage Device, you need not wait for the information to be written
on
the diskette to continue; keying continues into the second buffer while the previously
entered information
is being written on the diskette.
• When you turn the operator panel EXTEND/
ALARM switch on, the buffer operation
changes to a single (larger) buffer. When using a single buffer for keyboard entry, you
enter data
in the buffer and the data transfers to the output device when the buffer
fills. Keying to the buffer continues when data transfer to the output device
completes.
• Functional tests automatically check controller functions each time you turn the
terminal's power on. You check that these tests ran correctly when you
performthe
power on procedure that is described in Chapter 2.
Two types
of console printers are available: a serial console printer (for the IBM 3774
Communication Terminal),
or a line console printer (for the IBM 3775 Communica·
tion Terminal).
Serial Console Printer (for the IBM 3774 Communication Terminal)
I•
The serial console printer prints serially by character by selectively pushing print wires
forward to contact an inked ribbon and
the paper as the print mechanism moves across
the print line. The printer
is bidirectional; prints as the print head moves in either the
left-to-right or the right-to-left motion across the page.
• The print head moves to the right after printing each character entered from the key-
board
(to allow the viewing of the character) when the PRINT VIEW key is pressed.
The PRINT
VIEW key is described in the Using the Keyboard Buffer Edit Keys section
in Chapter
2.
• The print position indicator shown in Chapter 4 indicates the next position to be
printed.
Note: The printer's print position indicator is functional only when the terminal is in Print View
mode, and
is functional for print positions 1 through 124; this is described in more detail in the
description of the PRINT
VIEW key (see "Using the Keyboard Buffer Edit Keys") in Chapter 2.
• Margins, horizontal and vertical tab stops, and forms length are electronically con-
trolled. You define these tab settings when you perform one
of the procedures described
0
in the "Entering Operator Defined Jobs" sections in Chapter 2.
Line Console Printer (for the IBM 3775 Communication Terminal)
• Prints a line at a time when printing information from the controller buffer.
• The printable characters are on a continuously rotating print belt.
As the print belt
rotates, a comparison
is made between the character in front of each print hammer
and the character that
is to be printed in that print position. The print position
hammer fires, forcing the paper and ribbon against the character on the print belt,
when the character is in the correct position to print.
IBM 3774 and 3775 Operating Procedures Guide 1-3

• When you pause during keyboard entry, or at the end
of
the print line, the printer
platen automatically lowers to make the line you are printing visible. The platen.rises
automatically when printing continues.
• The print position indicator shown in Chapter 5 indicates the next position
to be printed.
• Margins, horizontal and vertical tab stops, and forms length are electronically con-
trolled. You define these tab settings when you perform one of the procedures
described in the "Entering Operator {)efined Jobs" sections in Chapter 2.
The
Keyboard
and
Operator
Panel
0
r-MODE---,
CPU
HOLD UPDATE/
SELECT
PRINT MONITOR AUTO
D
DD
---OFF---
SKIP
ADD
REC
IATTNI
PRINT
VIEW
0
ON
LINE
0
PRINT
INHIBIT
0
STANDBY
• The keyboard has character keys, a space bar, and other typewriter-like control keys.
The arrangement
of
these keys
is
similar to that on a typewriter keyboard.
• Keys for controlling system operation are located on either side
of
the keyboard;
switches for controlling system operation
are
located above the keyboard.
• Lights located above the keyboard indicate system status and error conditions.
• The numeric position readout (NPR) indicators display a three digit number that
indicates either the current record number when running a Diskette Storage
Device
job, or error conditions.
When
the operator panel OPRN CHECK or SYSTEM
CHECK
indicator
is
on, the number in the NPR indicates a special system status or error con-
dition; the condition for each message-type NPR display
is
listed in the "Error
Recovery and Problem Identification" section.
0 0 0 0 0 0
OPRN
SYSTEM
KBD
LINE
READER DISK!
CHECK
CHECK
EXTEND/.
ALARM INTRI' DISK
ODD
0 0
,-,
1=1
,-,
0 0 0 0
PROCEED
UPPER
1-1
1=1
CONSOLE
LINE
PUNCH
DISK2
CASE
I I
~
PRINTER
NUMERIC
POSITl_ON
READOUT
--OFF---
This
figure
shO'#S
tht
EBCDIC
keybolrd 1rr1ngement
for
l.1'18
in
the
U.S.
and
Canad.a.
Figure 1-4. Keyboard and Operator Panel
The Diskette Storage Device
1-4
• Information
is
recorded
on
a small operator-changeable diskette.
• The Diskette Storage Device records information from any
of
the system's input
devices, and information from the communications line.
• Information from system input devices can be stored on the diskette, and later trans-
mitted
to
a central processor.
..

..
...
•
• Up to five operator defined jobs can be stored on the diskette, and read into the con-
troller when
needed~ These jobs are described in the "Entering Operator Defined Jobs"
sections in Chapter 2. ·
• The information on the diskette
is divided into records. Each record is identified by a
record number
(I through 948); this number is used later to recall a record for updat-
ing, correction, or as a starting point for transmission to an output device or the com-
munications line. During a Diskette Storage Device job, the record number displays in
the operator panel readout indicators.
• The "Diskette Storage Device" chapter provides more information on using the
Diskette Storage Device, and provides information on handling the diskette.
The Auxiliary Operator Panel
The auxiliary operator panel has controls for adjusting the terminal's modem for best
performance with the communication facility.
Note: A modem is a device that links the terminal to the communication facility used in com-
municating with a central processor. A modem modulates and demodulates signals transmitted
over communication facilities.
The panel has a key-operated lock used to prevent unauthorized use of the system and
has a
SYSTEM RESET key used to reset all controller functions.
BSC
NORMAL
stc
TALK
~
DATA
A a TRANSMIT REce1vE
~ 'W EQUALIZER EQUALIZER
HALF SPEED SYSTEM 15 0, 15 0 /
RESET-~ ~
4
~ ~
1
8'
1
8'
~ 111v•11111111
KEY LOCK
Figure 1-5. Auxiliary Operator Panel
IBM 3774
and 3775 Operating Procedures Guide 1-5

\~1
. )
~
\i
\.._,I

I
I I
' I ,
'"'-l-/
..
,·· I I
\j_)
Chapter 2. Operating Procedures
Overview of IBM 3774 and 3775 Commupi~ation T«!rmipal Operation Cl
...'
1 TD.RN PQW~R ON: Thf: controller runs functional tests.
Define
ajob when tiletests complete.
2 DEFINE THE JOB:
Th~re are two ways to define ajob:
Operator Defined Jobs
Use the keyboarp.;card reader or Diskette Storage Device
to:
Define the jpb's identification number; the terminal
stores up to
five job definitions.
Pefine the job's input device and output device
combiilation.
Define featltres used in the job.
Define ll qata set name for diskette jobs.
Define the P,rinter forms format.
System Defined Jobs
.· When y6u start a job,
use the keyboard to select one of the
input aqd output device combinations already defined by
the terminal; the terminal defines the other job parameters.
3 START THE JOU:
Use the operator panel switches to select terminal functions.
Use the C9DE key to select additional terminal functions,
and to select options required in using the communica-
tion line.
Select one
of the OPERA TOR DEFINED jobs, or select a
SYSTEM DEFINED job.
Use the diskette data set name and starting record number
already defined, or override by entering a new name and
starting record number.
4 STOP THE JOB: The terminal is ready for starting the next job.
f.IBM 3774 and 3775 Operating Procedures Guide 2-1

Operation Exercises
If you are not already familiar with the operation of the terminal, do the keyboard-to-
Diskette-Storage-Device and
the Diskette-Storage-Device-to-console-printer jobs that
follow to become familiar with the terminal's operation.
Exercise Number 1: A Keyboard-to-Diskette-Storage-Device Job
2-2
1 If it is not already off, turn the terminal's POWER switch to the off position.
2
Turn these operator panel switches off:
HOLD PRINT
UPDATE/MONITOR
AUTO
EXTEND/ALARM
INTRP
(Interrupt)
DISK
3 If it is not already unlocked, set the security keylock to the UNLOCKED position;
the keylock
is located on the auxiliary operator panel if this feature is installed on
your terminal. Proceed to Step 4 if the keylock is not on the auxiliary operator
panel.
4 Set the terminal's POWER switch to the on position.
Note: The terminal runs tests and control functions; during this time a series of numbers dis-
play in the operator panel readout indicators. When the tests and control functions end, the
readout indicatorsare blank, and thePROCEED indicator turns on, the terminal is
in local mode.
5 Install a diskette in the Diskette Storage Device. Use the Make Ready Procedure in
Chapter 6
if you do not know how to install the diskette. Use adiskette that does.
not contain data required for another job; the diskette used in this procedure will
be erased.
6 Select the "Create Diskette" function:
A. Hold the CODE key down and
enter a numeric "O" from the keyboard;
B. Release the CODE key;
C. Enter a numeric "2" from the keyboard.
Note: The number "2" displays in the readout indicators; this number indicates that the
"Create Diskette" function
is selected, and will be performed when you press the EOM key
(Step 7). "Create Diskette" erases the diskette and creates
it as an IBM 3774 or IBM 3775
diskette.
7 Press the EOM key.
Wait
for the PROCEED indicator to come on before continuing. When the
PROCEED indicator comes on, the "Create Diskette" function has completed, and
the terminal is in local mode.
8 Start a keyboard-to-Diskette Storage Device job as follows:
A. Press
the START JOB key.
B. Enter these characters from the keyboard to select the input and output device
combination
(keyboard and Diskette Storage Device):
S24
C. Press
the EOM key.
D. A keyboard
to Diskette Storage Device (system defined) job starts, and these
operator panel indicators
tum on:
PROCEED
KBD (Keyboard)
DISK I
001 (The diskette record
number displays in the readout indicators)
..

I .
\_,J
•."-"
9 Enter this line (or a similar test data line) from the keyboard, and press
the
Return
key at
the
end
of
the line.
This is a test line for transfer
to
the Diskette Storage Device. II
Note:
As
you enter the line, the characters print on the console printer and enter the controller ' ' I I
buffer.
If
you notice an error
as
you are entering from the keyboard, you can use the keyboard
buffer edit keys to correct the error; operator exercises in how to use these keys are included
in
the
"Using the Keyboard Buffer Edit Keys" section in this rhapter.
10
Press the
EOM
key.
11
The test line
you
entered transfers from the controller buffer to the Diskette Stor-
age
Device. Diskette record number
002
displays in the readout indicators.
Note: Since the job started
is
a system defined job (and the keyboard
is
the job's input device),
the terminal assigns a data set name
of
SKOO
to the test line. You could continue entering data
from the keyboard, and the data would transfer
to
the Diskette Storage Device each time you
pressed the
EOM
key. For the purposes
of
this exercise, stop the job as described
in
Step 12.
12 Hold the CODE key down and press
the
START
JOB
key.
Note: The
job
stops, and the terminal goes
to
local mode; the PROCEED indicator turns on,
all other operator panel indicators are off.
13
Now
that
a test line
is
written
on
the
diskette (under data set name
SKOO),
do
"Exercise Number
2:
A Diskette-Storage-Device-To-Console-Printer
Job"
to
transfer the test line from the diskette
to
the
console printer.
Exercise
Number
2:
A
Diskette-Storage-Device-to-Console-Printer
Job
After completing "Exercise Number
1:
A Keyboard
to
Diskette Storage Device
Job",
perform this job.
1 Start a Diskette Storage Device to console printer job
as
follows:
A.
Press the START
JOB
key.
B.
Enter these characters from the keyboard
to
select the input and
output
device
combination (Diskette Storage Device and console printer):
S47
C.
Press the
EOM
key.
D.
A Diskette-Storage-Device-to-console-printer (system defined)
job
starts, and
these operator panel indicators turn on:
DISK 1
CONSOLE (Console Printer)
001
(The Diskette record number displays in the readout indicators)
2 The test line you entered in exercise one transfers from the Diskette Storage Device
and prints on the console printei:.
3
If
your machine has only one Diskette Storage Device, the job ends automatically,
and the terminal goes
to
local mode; the PROCEED indicator turns on, all
other
operator panel indicators are off.
If
your machine has two Diskette Storage Devices,
the second one
is
automatically selected after the first diskette is read.
IBM
3774 and 3775 Operating Procedures Guide
2-3