IBM 3270 User manual

GA 18-2041-2
File No. S360/S370/S3-09
Systems
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Systems
GA 18-2041-2
File No. S360/S370/S3-09
IBM 3270
Information Display System
3276 Control Unit Display Station
Planning and Setup Guide
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Third Edition (December 1979)
Information concerning the 3276 Control Unit Display Station was formerly contained
in IBM 3270 Information Display System: Planning and Setup Guide; IBM 3274 Con-
trol Unit, IBM 3276 Control Unit Display, IBM 3278 Display Station, IBM 3279 Color
Display Station, IBM 3287 Printer, IBM 3289 Line Printer, GA27-2827. The 3276 infor-
mation in this manual is a revision of 3276 information contained in GA27-2827-3. For
planning and setup information about the 3274 Control Unit, see IBM Information
Display System: IBM 3274 Control Unit Planning, Setup, and Customizing Guide,
GA27-2827.
This publication is for planning only. Changes are periodically made to the information
herein. Before using this publication in connection with the operation of IBM systems or
equipment, consult the latest IBM System/360 Bibliography, GC20-0360, and IBM
System/370 Bibliography, GC20-0001, for the editions that are applicable and current.
Requests for the latest copies of IBM publications should be made to your IBM
representative or to the IBM Branch 0 ffice serving your locality.
Some of the devices, options, and features listed in this publication may not be available
in every locale. Consult your local IBM marketing representative for information about
product availability.
A form for readers' comments is provided at the back of this publication. If the form has
been removed, address comments to International Business Machines Corporation, Dept.
825, 1133 Westchester Avenue, White Plains, New York 10604. IBM may use or
distribute any of the information you supply in any way it believes appropriate without
incurring any obligation whatever. You may, of course, continue to use the information
you supply.
©Copyright International Business Machines Corporation 1977, 1978, 1979

Preface
This guide is written for customers, planners, and IBM
representatives who may be responsible for planning the
installation and setup of the IBM 3276 Control Unit
Display Station and of the following 3270 Information
Display System units:
IBM 3278 Display Station
IBM 3279 Color Display Station
IBM 3287 Printer
IBM 3289 Line Printer
This guide contains planning information. For detailed
information about the functions and features of the above
3270 Information Display System units, see the latest
editions of the following publications:
An Introduction to the IBM 3270 Information Display
System, GA27-2739
IBM 3270 Information Display System: Component
Description, GA27-2749
IBM 3270 Information Display System: Installation
Manual -Physical Planning, GA27-2787
IBM 3270 Information Display System: Configurator,
GA27-2849
IBM 3270 Information Display System: IBM 3276
Control Unit Display Station Operator's Guide,
GA18-2040
IBM 3270 Information Display System: IBM 3278
Display Station Operator's Guide, GA27-2890
IBM 3270 Information Display System: IBM 3279 Color
Display Station Operator's Guide, GA33-3057
IBM 3270 Information Display System: IBM 3287
Printer Models 1 and 2 Operator's Guide, GA27-3150
IBM 3270 Information Display System: IBM 3287
Printer Models JC and 2COperator's Guide, GA27-3230
IBM 3270 Information Display System: IBM 3289 Line
Printer Operator's Guide, GA27-3147
See Figures P-1 through P-5 for other manuals that may
help you plan your installation.

IBM 3270 Information Display System and Associated Manuals
GeneralInformation and Installation Manuals
An Introduction to
the 3270 Jn formation
Display System
GA27-2739
1
IBM 3270 Information
Display System
Color and Programmed
Symbols
GA33-3056
J
,
IBM 3270 Information IBM 3270 Information
Display System Display System
Configurator
I---
Character Set
Reference
GA27-2849 GA27-2837
IBM 3270 Information
Display System
Installation Manual-
Physical Planning
GA27-2787
_...
I 1
IBM 3270 Information
IBM 3270 Information
Installation and
Display System Display System
Assembly of Coaxial
Template (English
Template (Metric
Cable and Accessories
Units) Units)
for Attachment to IBM
Products
GX27-2990
GX27-2999
GA27-2805
Figure P-1. General Information and Installation Manuals
ii

Customer Setup Manuals
IBM 3270 Information
Display System
IBM 3276 Control Unit
IBM 3276/327B Display
IBM 3276/327B Display
IBM 3276 Control Unit
Display Station Setup
Station Keyboard
Station Magnetic Slot
Display Station Planning Instructions 1 Replacement
I--
Reader Setup
and Setup Guide (includes Instructions Instructions
327B, 3279, 32B7, and
3289)
GA18-2017 GA27-2895
GA27-2873
GAlS-2041
IBM 3278 Display Station
IBM 3278 Display
Setup Instructions 1 Station Switch Control
._.__
I--
Unit Setup
Instructions
GA27-2838
GA27-2872
IBM 3279 Color Display IBM 3279 Color Display
IBM 3279 Color Display
Station Customer Station Station
..._
Setup Instructions 1
t----;
Switch Control Unit
r-
Keyboard Replacement
Setup Instruction
GA33-3050 GA33-3066
GA33-3067
IBM 3287 Printer
Models 1 and 2
..,__
Setup Instructions 1
GA27-3152
IBM 3287 Printer
Models 1C and 2C
....-
Setup Instructions 1
GA27-3233
IBM 3289 Line Printer
Models 1 and 2 Setup
,__
Instructions 1
GA27-3140
1 will be delivered with the indicated machine.
Figure P-2, Customer Setup Manuals
iii

ProgrammingManuals
iv
Introduction to
Programming the IBM
3270 Information
Display System
GC27-6999
IBM 3270 Information
Display System
Component Description
GA27-2749
IBM 3270 Information
Display System
Character Set
Reference
GA27-2837
IBM 3287 Printer
Models 1 and 2
Component Description
GA27-3153
IBM 3287 Printer
Models 1C and 2C
Component Description
GA27-3229
IBM 3289 Line Printer
Component Description
GA27-3176
t----i
Figure P-3. Programming Manuals
IBM 3270 Information Forms Design
Display System
Reference Guide for
Display Layout Sheet
1--
Printers
GX27-2951
GA24-3488

Operations Manuals
IBM 3270 Information
Display System
IBM 3276 Control Unit
Display Station
Operator's Guide
GA18-2040
IBM 3270 Information
Display System
IBM 3278 Display
Station Operator's
Guide
GA27-2890
IBM 3270 Information
Display System
IBM 3279 Color Display
Station Operator's
Guide
GA33-3057
IBM 3287 Printer
Models 1 and 2
Operator's Guide
GA27-3150
IBM 3287 Printer
Models 1C and 2C
Operator's Guide
GA27-3230
IBM 3289 Line Printer
Models 1 and 2
Operator's Guide
GA27-3147
t---
Figure P-4. Operations Manuals
IBM 3276/3278
Problem Report Form
GX23-0201
IBM 3287 Printer
Models 1 and 2
Operator's Trouble
Report
GX27-2923
IBM 3287 Printer
Models 1C and 2C
Operator's Trouble
Report Form
GA27-2931
IBM 3289 Line Printer
IBM 3289 Line Printer
Models 1 and 2
Models 1 and 2
Operator Reference
t--
Operator's Trouble
Summary
Report Form
GA27-3148
GX27-2922
v

Problem Determination Manuals
IBM 3270 Information
IBM 3270 Information
Display System
Display System
System Problem
3276 Control Unit
Determination for the
Display Station Problem
3276 Control Unit Determination Guide 1
Display Stations
GA18-2042
GA18-2014
IBM 3270 Information
Display System
3278 Display Station
Problem Determination
Guide 1
GA27-2839
IBM 3270 Information
Display System
3279 Color Display
Station Problem
Determination Guide 1
GA33-3051
IBM 3287 Printer
Models 1 and 2
Problem Determination
Guide 1
GA27-3151
IBM 3287 Printer
Models 1C and 2C
Problem Determination
Guide 1
GA27-3231
IBM 3289 Line Printer
Models 1 and 2 Error
Recovery and Problem
Determination Guide 1
GA27-3141
1 will be delivered with the indicated machine.
Figure P-5. Problem Determination Manuals
vi

Contents
Introduction
3276 Cluster Unit Descriptions 1
Configuration Planning 2
System Planning 2
Site Preparation 2
Communication Services 3
Programming Support 3
3270 Exchange Station Identification (SDLC Only) 4
3276 Terminal Identification 4
3276 SDLC Station Address 4
Encrypt/Decrypt Feature (Models 11, 12, 13, and 14) 5
Pre-Delivery Planning 5
3276 Device Cables 5
3276 Cluster Network Address Labels 6
3276 Communication Cable 6
Modem Considerations 7
3276 Switches 8
Setup Procedures 8
3276 Setup Procedures 8
3278 Setup Procedures 9
3279 Setup Procedures 9
3287 and 3289 Setup Procedures 9
Replacing Other 3270 Units with 3276s and Attached Units 9
Replacing a 3271 with One or More 3276s 9
Device Addresses 9
Power 10
Cables 10
Modems 10
Replacing a 3275 with a 3276 10
Problem Determination Procedures 11
Relocation/Removal 11
Progress Review 12
IBM Americas/Far East and IBM Europe/Middle East/Africa 13
Supplemental Information 13
Safety 13
Security 13
Personnel Training 14
Supplies 14
Voice Communication between 3276 ciuster Operators and Host
System Operators 14
Reference Manuals 14
Appendix A. Planning Checklist 17
Appendix B. 3276 Device Cable Attachment 21
Appendix C. 3276 Communication Cable Connection
Instructions 23
3276 with an Integrated Modem Atcached to a Nonswitched Line
(U.S. and Canada only) 23
3276 with an Integrated Modem Attached to a Nonswitched Line
(Japan only) 24
3276 with an Integrated Modem Attached to a Switched Line with
Manual Answer (U.S. and Canada Only) 26
3276 with an Integrated Modem Attached to a Nonswitched Line
with Switched Network Backup (SNBU) and Manual Answer
(U.S. and Canada Only) 27
3276 with an Integrated Modem Attached to a Nonswitched Line
with Switched Network Backup (SNBU) and Auto-Answer
(U.S. and Canada Only) 28
3276 with an Integrated Modem Attached to a Switched Line with
Auto-Answer (U.S. and Canada Only) 29
3276 with an External Modem Attached to a Switched or
Nonswitched Line (All Countries except United Kingdom Date[
Modem) 30
3276 with an External Modem Attached to a Switched or
Nonswitched Line (United Kingdom Date[ Modem) 32
3276 with an Integrated Modem Attached to a Switched Line with
Auto-Answer (All Countries except U.S. and Canada) 34
3276 with an Integrated Modem Attached to a Nonswitched Line
with Switched Network Backup (SNBU) and Auto-Answer
(All Countries except U.S. and Canada) 35
3276 with an Integrated Modem Attached to a Nonswitched Line
(All Countries exceTJt U.S .. Canada. and Javan) 36
3276 with a Digital Data Service Adapter (DDSA) Attached to
A.T.&T. Channel Service Unit (U.S. Only) 37
3276 with a Loop Adapter Attached to a Loop (All Countries) 38
Appendix D. 3276 Switches 39
Switches Al-A8: SDLC Address Switches 39
Switches B 1-BS: BSC Control Unit Address Switches (Except
Loop Adapter Feature Machines ) 39
Switches B6: Full-Duplex (FDX)/Half-Duplex (HDX) Switch
(Except Loop Adapter Feature Machines) 40
Switch B7: (Except Loop Adapter Feature Machines) 42
Switch B8: NRZ/NRZI Switch (Except Loop Adapter Feature
Machines) 42
Switches Bl-BS: (Loop Adapter Feature Machines Only) 42
Switches B6-B8: Line Speed Switches (Loop Adapter Feature
Machines Only) 42
Transmit Level Switches (U.S. and Canada Only) 43
Primary Line Speed/Secondary Line Speed Switch 45
SNBU/Non-Switched Line Switch 45
SDLC/BSC Switch 45
Communicate/Local Switch (Loop Adapter Feature Machines
Only) 45
3276 Switch Settings Form 46
Abbreviations 49
vii

Figures
Figure P-1 •
.. Figure P-2.
Figure P-3.
Figure P-4.
Figure P-5.
Figure A-1.
Figure D-1.
Figure D-2.
Figure D-3.
Figure D-3a.
Figure D-4.
Figure D-5.
Figure D-6.
viii
General Information and Installation Manuals ii
Customer Setup Manuals iii
Programming Manuals iv
Operations Manuals v
Problem Determination Manuals vi
Planning Checklist, Sample Plan (3 parts) 17
SDLC Address Switch Setting
(Switches Al-A8) 40
BSC Control Unit Address Switch Setting
(Switches Bl-BS) 41
FDX/HDX Switch Setting Summary 42
Loop Line Speed Switch Setting (Switches B6-B8) 43
3276 Transmit Level Switches 44
Integrated Modem Transmit Level Settings by
Country 44
Example of a Completed 3276 Switch Settings
Form 46

Introduction
This planning and setup guide will help you plan the installation of the IBM 3276 Control
Unit Display Station and of the following 3270 Information Display System units:
• IBM 3278 Display Station
• IBM 3279 Color Display Station
• IBM 3287 Printer
• IBM 3289 Line Printer
These units have convenient customer access areas to which your personnel can attach the
device cables and the keyboard and feature cables.
The 3276, 3278, 3279, 3287, and 3289 units are delivered with unpacking instructions
attached to an outside surface of the shipping carton. In addition to the unpacking in-
structions, the 3276, 3278, 3279, 3287, and 3289 units have setup instructions inside the
shipping carton. The unpacking instructions and the setup instructions are step-by-step
procedures that describe the unpacking and setup tasks for the unit.
Using the planning information in this publication will help you to ensure that your
personnel can (1) unpack, position, set up, and check out the 3276, 3278, 3279, 3287,
and 3289 units, and (2) unpack, position , and attach the device cables. As a result, you
will be able to use your new display/printer cluster at an early date. If, later, you choose
to improve the work flow by relocating these units within the site, your personnel should
be able to accomplish the relocation quickly and easily.
3276 Cluster Unit Descriptions
The 3276 cluster consists of an IBM 3276 Control Unit/Display Station with attached
display stations and/or printers.
For detailed information about the functions and features of the 3276 and the units that
can be attached to the 3276, see the latest editions of:
An Introduction to the IBM 3270 Information Display System, GA27-2739
IBM 3270 Information Display System: Component Description, GA27-2749
IBM 3270 Information Display System: Installation Manual -Physical Planning,
GA27-2787
IBM 3270 Information Display System: Configurator, GA27-2849

Configuration Planning
System Planning
Site Preparation
2
To plan the configuration of the 3276 and the attached units, use the appropriate (U.S.,
Americas/Far East, or Europe/Middle East/Africa) Configuration Tables in IBM 3270
Infonnation Display System: Configurator, GA27-2849. These tables will help you
determine which feature codes are needed to:
• Connect the 3276 to a host system through communication facilities or through an
IBM 3704 or 3705 Communications Controller.
• Connect the 3276 to the IBM 81XX Processor through the loop.
• Provide the required quantity of 3276 terminal adapters.
• Provide feature compatibility among the individual units.
The tables also indicate necessary features, optional features, prerequisite features, and
features that cannot coexist.
If you intend to use 3276 cluster copy operntions, it is recommended that you consider
the effect that the cluster configuration has on the Printer Default matrix. A Printer
Default matrix in the 3276 directs the cluster copy operations. Default source-destination
relationships are generated at power-on time; the default values are determined by the
physical configuration of the cluster units. For additional information regarding this
function, refer to the IBM 3270 Information Display System: Component Description,
GA27-2749.
The following tasks should be planned so they can be accomplished in a timely manner:
• Site preparation for the 32 76 clusters
• Communication facilities preparation for the 3276
• Programming support preparation
• 3276 pre-delivery planning activities
It may be useful to designate a person in your organization to be responsible for ensuring
that all these tasks are planned. The Planning Checklist in Appendix A of this guide con-
tains the events, in a suggested sequence, that should be planned in order to set up a 3276
and the attached units for the first time; it therefore contains more detail than is required
for adding to or replacing an existing display/printer system. In either case, each event
should be carefully considered so that setting up the 3276 and the attached units is prob-
lem-free.
The specifications for all physical requirements of the 3276, 3278, 3279, 3287, and 3289
units are given in IBM 3270 Information Display System: Installation Manual -Physical
Planning, GA27-2787.

Communication Services
Programming Support
This guide will help you provide..compatibility between these units and the following:
• Work space considerations
• Electrical requirements
• Cable requirements and their installation
• Power cord plug requirements and their installation.
• Environmental requirements
Arrangements need to be made for the installation of the communication facilities
between the 3276 and the host system communication unit/adapter. There must be
compatibility between the 3276, the modems, the communication line, and the
communication unit/adapter; for example, line speed, duplex or half-duplex facilities, and
non-return to zero (NRZ) or non-return to zero inverted (NRZI).
When a 3 276 is attached directly to an IBM 3704/3705 Communications Controller,
there are no modems or communication lines. However, the 3704/3705 and the 3276
must be compatible. It is recommended that you request assistance from your IBM
representative to determine whether the 3704/3705 and the 3276 are compatible.
When the 3276 has a Loop Adapter feature (and is attached to the loop), no modem is
used. The 3276 has a communication cable, called the Loop Station Connector (LSC)
cable, which connects the 3276 to the loop. The same line speed on the loop must be se-
lected and set in the 3276 operator panel drawer to perform the communicate operation.
Compatibility among these components is a major consideration in new installations. To
reduce delays caused by incompatibility, it is recommended that you request assistance
from your communications representative and from your IBM representative to
determine whether the 3276, modems, communication line, and communication
unit/adapter are compatible. In addition, schedules should be established to ensure that
the modems, communication line, and communication unit/adapter are installed and
tested before delivery of the 3276 and the attached units.
It is important to plan for proper programming support at the host system. The 3276
clusters can be added to most 3270 display/printer systems with minimal impact on the
existing programs. In certain cases, however, host system definition (SYSGEN)
parameters will have to be changed to accommodate attachment of a 3276 cluster.
Information concerning programming requirements is included in the following
publications:
• An Introduction to the IBM 3270 Information Display System, GA27-2739
• Introduction to Programming the IBM 3270, GC27-6999
• IBM 3270 Information Display System: Component Description, GA27-2749
In addition, it is recommended that for 32 76 clusters you enhance your system
availability and serviceability by installing the Online Test Executive Program (OLTEP) at
the host system. Call your IBM representative for information about OLTEP.
3

3270 Exchange Station Identification (SDLC Only)
3276 Terminal Identification
3276 SDLC Station Address
4
The Exchange Station Identification (XID) number described below should be added to
the host programs for a 3276 attached to a switched network, but the XID is not critical
when the 3276 is attached to a nonswitched network.
Bits Meaning
0-3 ID format B'OOOO'
4-7 PU type B'OOlO'
8-15 Self-description X'OO'
16-27 X'Ol8'
28-47 Terminal ID number
Each terminal operating under synchronous data link control (SDLC) has a permanent,
unique, 6-byte identification that it will transmit in response to a request for its ID (XID
command). This identification, described below, is fixed at the time of manufacture and
is not selectable.
Bits 28-47 of the Exchange Station Identification are a unique Terminal ID that can be
obtained from the seven digits either shown in the Machine History list supplied with the
3276 or engraved on the side frame of the 3276. These seven digits are the machine serial
number and should be converted into the proper Station ID as follows:
l. The first two digits of the machine serial number should be 00, 23, 55, or 82. Each
number should be converted into the following bits:
Bits 28-31
00, 23 B'OOOO' or X'O'
55 B'l 100' or X'C'
82 B'l 111' or X'F'
2. The remaining five digits can be converted into bits 32-47 by use of the IBM System
Reference Card, GX20-1850 or GX20-1703.
Example: If the seven digits of your machine are 00-15623.
Bits
28-31 B'0000' or X'O'
32-47 B'OOll 110100000111' or X'3D07'
Complete Terminal ID is X'020001803D07'
__ .... L..--
Fixed Variable
The SDLC station address is a 1-byte address that must be selected by the customer at
setup time.
An SDLC Station address of either X'OO' or X'FF' should not be assigned.
Note: The SDLC station address must correspond to the address selected by Host
Programming Support (NCPgeneration).

Encrypt/Decrypt Feature (Models 11, 12, 13, and 14)
Pre-Delivery Planning
3276 Device Cables
lt is the customer's responsibility to install a copy of the secondary logical unit
(LU) key (the terminal master key) in the 3276 equipped with the Encrypt/Decrypt
feature (#3680). This should be done by someone in a position of trust, such as a
security officer. Once the terminal master key has been installed in the 3276, the
3276 generates a verification value based on the terminal master key. A master-key
verification procedure can be performed by any operator without compromising the
security of the Encrypt/Decrypt feature. A mercury battery, IBM Part 1743456, is
installed in the 3276 to sustain the terminal master key when the 3276 power is
off. Replacing this battery, or its equivalent, is also a customer responsibility.
Procedures to install and verify the terminal master key, and to replace the mercury
battery, are described in IBM 3276 Control Unit Display Station Operator's Guide,
GA18-2040.
Refer also to IBM Cryptographic Subsystem Concepts and Facilities, GC22-9063, for
background information, and to IBM 3270 Information Display System Component
Description, GA27-2749, for programming information.
Some of the 3276 setup tasks require your personnel to set configuration switches and
connect cluster cables. To prevent delays and help ei1sure a smooth installation/setup, it is
recommended that a designated person in your organization:
1. Compile the installation-dependent information described in this section
2. Distribute the installation-dependent information to the appropriate personnel
3. Coordinate the activities of your personnel
The device cables are the coaxial cables that connect the 3276 to its display stations and
printers. These cables should be procured and installed before delivery of the 3276 and of
the units that will be attached to the 3276. The setup personnel will connect these cables
to the 3276 and to the attached units.
Note: If you are replacing a 3271 and its attached units with a 3276 and its attached
units, you can use the existing 3271 device cables. However, the 3271 device cables must
be connected/disconnected by an IBM service representative, because the 3271 and its
attached units do not have customer access areas. Before the IBM service representative
disconnects these cables, you should have the cables marked as described below.
To reduce delays associated with connecting these cables to the 3276, it is recommended
that each cable be marked at both ends to identify the 3276 port (1 to 7) to which it is to
be connected and the unit type to be attached.
Ft)f additional information concerning device cables, refer to IBM 32 70 Information
Display System: Installation Manual -Physical Planning, GA27-2787.
A 3276 Device Cable Attachment form is provided in Appendix B of this guide to help
simplify marking and connecting the. cables. (For completing the Network Address
portion of the form, refer to "3276 Cluster Network Address Labels.") A form should be
completed for each 3276 you order. Copies of the completed form should be given to the
personnel who will install and mark the cables and to the setup personnel who will
connect the cables to the 3276. In addition, a copy of the form should be available at the
3276 for future reference.
Note: Port 0 must be the 3276 Integral Display.
5

32 76 Cluster Network Address Labels
32 76 Communication Cable
6
Hexadecimal address labels (IBM Part 1743290) are delivered with the 3276. After each
cluster unit is set up, the labels that specify the unit's network address should be attached
to the unit's address label holder (if present).
It is recommended that a designated person in your organization (1) obtain the cluster
network addresses from the system programmer, (2) enter the addresses in the Network
Address .column of the 3276 Device Cable Attachment fontr'in Appendix B, and (3)
distribute the network addresses information to the person who will attach the address
labels.
For information about systems network architecture (SNA) network addresses, see
Systems Network Architecture General Information: Network Addresses, GA27-3102;
for information concerning BSC network addresses, see IBM 3270 Information Display
System: Component Description, GA27-2749.
The communication cable that connects the 3276 to the modem, to the communication
(acility, to the 3704/3705 (local attachment), or to the loop is delivered with the 3276.
The standard cable length is 6.1 metres (20 feet), or in the case of the loop 1.8 metres (6
feet); optional cable lengths of 3.1 metres (10 feet), 9.1 metres (30 feet), and 12.2 metres
(40 feet), or in the case of the loop4.3 metres (14 feet) may be specified. The location of
the 3276's modem or communication facility termination, of the 3704/3705, or of the
LSC receptacle for the loop, may require the communication cable to be routed through
floors, walls, or ceilings. If the communication cable must be routed through floors,
walls, or ceilings, you should arrange to have your maintenance personnel or a contractor
route the cable and connect the cable to the communication facilities. Instructions for
connecting a communication cable to the 3276 are provided in the IBM 3276 Setup In-
structions, GA18-2017, delivered with the 3276.
Notes:
1. When the 3276 local attachment to a 3704/3705 is used, the total cable length
between the 3704/3705 and the 3276 must not exceed 30.5 metres (100 feet).
For information concerningattachments longer than 12.2 metres (40 feet), call
your IBM representative.
2. When the 3276 EIA/CC/1T direct attachment to a 8lxx is used, the total cable
length must not exceed 12.2 metres (40 feet).
Connection instructions and diagrams for this cable are given in Appendix C of this guide.
It is recommended that a designated person in your organization determine which of the
configurations'listed below applies to the cluster, then copy or remove the applicable cable
connection instructions in Appendix C, and give them to the appropriate person.
U.S., Canada, and Japan
• 3276 with an integrated modem attached to a nonswitched line
U.S. and Canada Only
9. 3276 with an integrated modem attached to a switched line with manual answer
• 3276 with an integrated modem attached to a nonswitched line with switched network
backup (SNBU) and manual answer
• 3276 with an integrated modem attached to anonswitched line with SNBU and auto-
answer
• 3276 with an integrated modem attached to a switched line with auto-answer

Modem Considerations
All Countries except United Kingdom Date! Modem
• 3276 with an external modem attached to a switched or nonswitched line
United Kingdom Date!Modem
• 3276 with an external modem attached to a switched or nonswitched line
All Countries except U.S. and Canada
• 3276 with an integrated modem attached to a switched line with auto-answer
• 3276 with an integrated modem attached to a nonswitched line with SNBU and auto-
answer
All Countries except U.S., Canada, and Japan
• 3276 with an integrated modem attached to a nonswitched line
U.S. Only *
• 3276 with a Digital Data Service Adapter (DDSA) attached to the A. T. & T. Channel
Service Unit
All Countries
• 3276 with a Loop Adapter attached to a Loop
In countries served by IBM Americas/Far East (except Canada) and IBM Europe/Middle
East/Africa where it is permissible, your personnel (or contractor) will connect the
communication cable to the external modem, communication facilities termination, or
Loop Station connector. Where the local (country) regulations require a manufacturer's
representative to make the connection to the communication facility, the local IBM
branch office should be called for assistance.
W.rap Feature: Determine whether the modem permits data from the 3276 to be
wrapped under control of the 3276 or whether the modem has a switch to control the
wrap function. If the modem has the wrap capability and wrapping can be controlled
from the switch on the modem, it is recommended that this method be used.
Primary Line Speed/Secondary Line Speed Option: If the modem has a secondary line
speed option, determine whether this option can be controlled externally (by the 3276)
or by a switch on the modem. If the option can be controlled by a switch, it is
recommended that the switch be used to control this option rather than controlling it
externally by the 3276.
When the 3276 provides clocking, primary line speed/secondary line speed must be
controlled by a switch on the 3276. This switch is located on the operator panel drawer
to the right of the display screen. See the 3276 Switch Settings Form in Appendix D.
Switched Network Backup (SNBU) Feature: If the modem has this feature, determine
whether this feature can be controlled externally (by the 3276) or at the modem. It is
recommended that this feature be controlled by the 3276 by setting the SNBU/Non-
switched Line switch to SNBU. The switch is located on the operator panel drawer to the
right of the display screen. See the 3276 Switch Settings Form in Appendix D.
Note: In the U.S. and Canada a switched network attachment requires the use of a
protective device. This must be ordered from an original equipment manufacturer (OEM)
communication equipment supplier and installed separately.
* Trademark of American Telephone & Telegraph Co. 7

3276 Switches
Setup Procedures
3276 Setup Procedures
The 3276 has configuration switches that the setup personnel must set before the 3276
can be put online to communicate with the host system. To simplify setting these
switches, it is recommended that a designated person in your organization determine the
correct switch settings for the cluster configuration, record the settings on the 3276
Switch Settings Form in Appendix Din this guide, and supply the completed form to the
3276 setup personnel. Included in Appendix D are (1) descriptions of all the 3276
configuration switches, (2) instructions for completing the form, and (3) an example of a
completed form. A form should be completed for each 3276 ordered. In addition, a copy
of the form should be available at the 3276 for future reference.
Each 3276, 3278, 3279, 3287, and 3289 unit is delivered with its own:
• Unpacking instructions attached to an outside surface of the shipping carton
• Setup instructions
• Problem Determination Guide (PDG)
Before each unit is unpacked and placed in its prepared location, the personnel who will
unpack and place the units should read the unpacking instructions.
After the unit is unpacked and put in place, the setup personnel should perform the
step-by-step procedures in the setup instructions. If problems occur during setup, the
setup instructions provide assistance in resolving them.
The following information on setup procedures is included for planning purposes only
and to give you a general idea of what is involved. It is not intended to replace the setup
instructions delivered with the individual units.
It is recommended that the setup instructions be obtained and read before the units are
delivered. These instructions may be ordered as Forms GAl8-2017 (3276), GA27-2838
(3278), GA33-3050 (3279), GA27-3152 (3287), and GA27-3140 (3289).
After the 3276 is unpacked and placed in its prepared location, the 3276 setup involves:
• Connecting the 3276 keyboard cable and the communication cable to the 3276 front
connector panel, or
• Connecting the communication cable to the loop (for 3276 with Loop Adapter).
• Connecting the device cables from the 3278s/3279s/3287s/3289s to the 3276 rea1
connector panel.
• Connecting the magnetic slot reader (if present) to the 3276.
• Setting the 3276 switches.
• Plugging in the power cord and switching on the 3276 power.
• Performing the 3276 checkout procedures.

3278 Setup Procedures
3279 Setup Procedures
After the 3278 is unpacked and placed in its prepared location, the 3278 setup involves:
• Connecting the keyboard cable to the 3278.
• Connecting the device cable(s) (coaxial cable from the control unit) to the 3278 or to
the Switch Control Unit feature.
• Connecting the.magnetic slot reader (if present) to the 3278.
• Plugging in the power cord and switching on the 3278 power.
• Performing the 3278 checkout procedures.
After the 3279 is unpacked and placed in its prepared location, the 3279 setup involves:
• Connecting the keyboard cable to the 3279.
• Connecting the device cable(s) (coaxial cable from the control unit) to the 3279 or to
the Switch Control Unit feature.
• Connecting the magnetic slot reader (if present) to the 3279.
• Plugging in the power cord and switching on the 3279 power.
• Performing the 3279 checkout procedures.
After completing the 3279 setup procedure, it may be necessary to adjust the color con-
vergence.
3287 and 3289 Setup Procedures
After the 3287 or 3289 is unpacked and placed in its prepared location, the setup
involves:
• Plugging in the power cord and switching power on.
• Performing the 3287 or 3289 checkout procedures.
• Connecting the device cable (coaxial cable from the control unit) to the 3287 or 3289.
Replacing Other 3270 Units with.3276s and Attached Units
Replacing a 3271 with One or More 3276s
Device Addresses
When a 3271 and its attached units (3277s/3284s/3286s/3287s/3288s) are replaced by
one or more 3276s with attached 3278s/3279s/3287s/3289s, special consideration should
be given to planning in order to minimize changes to the existing device addresses, power,
cables, and modems. Replacing a 3284 or a 3286 with a 3287 requires physical planning,
because the 3287 is a table-top unit, whereas the 3284 and the 3286 are floor-standing
units.
Note: The 3277 keyboards, keys, and operator ID card readers cannot be used with the
3276/3278/3279.
Both the 3271 and the 3276 can control a cluster of display/printer units. The 3271 can
control up to 32 attached units; the control unit portion of the 3276 can control up to 8
units (7 attached units and the 3276 Display Station). Both the 3271 and the 3276 have
ports to which the units attach. For problem determination, the 3276 Display Station
must be connected to 3276 port 0.
9