----- --------------- '-3270 Information
Display System

Introduction

------ --- - ---- --------_.-

3270 Information
Display System

Introduction

GA27-2739-22

Twenty-Third Edition (October 1988)

This major revision obsoletes and replaces GA27-2739-21. This edition adds information about the 3174
Subsystem Control Unit models, features, and terminals that were announced since the last revision of thismanual.
Some illustrations in this publication represent design models and might not be exact replicas ofproduction models.
Changes are made periodically to the information herein; before using this publication in connection withthe operation of IBM systems, consult the latest IBM Systeml370, 30xx, and 4300 Processors Bibliography,
GC20-0001, for the editions that are applicable and current.
References in this publication to IBM products, programs, or services do not imply that IBM intends tomake these available in all countries in which IBM operates. Any reference to an IBM licensed program inthis publication is not intended to state or imply that only IBM's licensed program may be used. Anyfunctionally equivalent program may be used instead.
Publications are not stocked at the address given below. Requests for IBM publications should be made to
your IBM representative or to the IBM branch office serving your locality.
A form for readers' comments is provided at the back of this publication. If the form has been removed,
address comments to IBM Corporation, Department E02, P.O. Box 12195, Research Triangle Park, N.C.,
U.S.A. 27709-9990. IBM may use or distribute whatever information you supply in any way it believes
appropriate without incurring any obligation to you.

© Copyright International Business Machines Corporation 1971, 1987, 1988

Preface
This publication provides information about the IBM 3270 I nformation Display
System and presents introductory information about these IBM 3270 Information
Display System products:
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3174 Subsystem Control Unit Model 1L (local attachment)
3174 Subsystem Control Unit Models 1R and 2R (remote attachment)
3174 Subsystem Control Unit Model 3R (Token-Ring attachment)
3174 Subsystem Control Unit Models 51 Rand 52R (remote attachment)
3174 Subsystem Control Unit Model 53R (Token-Ring attachment)
3174 Subsystem Control Unit Models 81R and 82R (remote attachment)
3276 Control Unit Display Station Models 1, 2, 3, and 4 (remote attachment,
BSC or SDLC protocol)
3276 Control Unit Display Station Models 11, 12, 13, and 14 (remote attachment,
SDLC protocol)
3191 Display Station Models A, B, 0, E and L
3192 Display Station Models C, 0, F, G, Land W
3193 Display Station (scanner attachment)
3194 Display Station Models C, 0 and H
3262 Line Printer Models 3 and 13
3290 Information Panel Models 220, 230, and T30
3299 Terminal Multiplexer Models 2 and 3
3812 Pageprinter Model 2 with 3270 Information Display System Attachment
Feature3814 Switching Management System Models A 1, A2, A3, and A4
4224 Printer (IPDS) Models 201, 202, 2E2, and 2C24234 Printer Model 1
4245 Printer Models 012 and 020
4250 Pri nter Model 1 and 25209 Link Protocol Converter
5210 Printer Models G1 and G2
5373 3270-PC AT/G, AT/GX
5540 Workstation (Japan only)
5550 Workstation (Japan only)
5560 Workstation (Japan only)
5578 Workstation (Japan only)
6150 RT Personal Computer all models with 3278/3279 Emulation Adapter
6151 RT Personal Computer all models with 3278/3279 Emulation Adapter
6262 Printer Models 012 and 014
8525 Personal System/2 with 3278/3279 Emulation Adapter
8530 Personal System/2 with 3278/3279 Emulation Adapter
8550 Personal System/2 with 3270 Connection
8560 Personal System/2 with 3270 Connection
8570 Personal System/2 with 3270 Connection
8580 Personal System/2 with 3270 Connection
OEM Devices and Subsystems-Serial OEM Interface (SOEMI).

Not all terminals listed are available in every country. Consult your IBM marketing
representative for details about hardware and programming support available foryour configuration.

Prefaceiii

3270 Publications
A full range of publications is available for use with the 3270 Information Display
System. These publications explain how to plan for, set up, install, program, anduse the components. For a summary listing of 3270 publications, see IBM 3270
Information Display System: Library User's Guide, GA23-0058.

iv

IBM 3270 Information Display System Introduction

Contents
Chapter 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Com ponents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programming Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customer Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Problem Determination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
1-1
1-3
1-5
1-5
1-5

Chapter 2. Capabilities of the 3270 System . . . . . . . . . . . . . . . . . . . . . . . .
Inqui ries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Personal Computing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Document Development ...... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Program Development .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Monitoring System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Color Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graphics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programmed Symbols: Alphanumeric and Graphic Applications . . . . . . . . .
Vector Graphics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Security Enhancements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1
2-1
2-1
2-3
2-3
2-3
2-3
2-4
2-4
2-5
2-5
2-5
2-6

Chapter 3. Display Stations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3191 Display Station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3192 Display Station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3193 Display Station (Models 1 and 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3194 Display Station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-83290 Information Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Chapter 4. IBM Personal Computers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
IBM 5560/50/40 Multiworkstations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
IBM 6150 RT Personal Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
IBM 6151 RT Personal Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
IBM 8525 Personal System/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
IBM 8530 Personal System/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
IBM 8550 Personal System/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
IBM 8560 Personal System/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
IBM 8570 Personal System/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
IBM 8580 Personal System/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Chapter 5. Keyboards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Touch-Typing Controls .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
General Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Screen Management, Program Access, and Editing Controls . . . . . . . . . . . .
Program Function and Attribute Selection Controls . . . . . . . . . . . . . . . . . .
Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keyboard Definition Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Chapter 6. Printers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3812 Page Printer Model 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4224 Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4234 Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4245 Printer Models 012 and 020 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6-1
6-2
6-3
6-4
6-5

Contents

V4250 Printer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-6
5210 Printer Models G01 and G02 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
6262 Printer Models 012 and 014
6-8
Chapter 7. Control Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
3174 Subsystem Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Asynchronous Emulation Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
ASCII Emulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
3270 Emulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
ASCII Passthrough . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
General Items Common to ASCII and 3270 . . . . . . . . . . . . . . . . . . . . 7-6
Central Site Customization Utility (CSCU) . . . . . . . . . . . . . . . . . . . . . . . . 7-7
File Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-7
Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
Host Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
Central Site Change Management (CSCM) . . . . . . . . . . . . . . . . . . . . . . 7-8
20MB Fixed Disk Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
Intelligent Printer Data Stream . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
System Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
Programming Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
Error Reporting and Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
IBM Token-Ring Network 3270 Gateway Feature . . . . . . . . . . . . . . . . . 7-11
Gateway Feature Components . . . . . . . . . . . . . . . . . . . . .. . . . . .. 7-12
Token-Ring Adapter '" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-12
Microcode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-123174 Relationship . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12
Program Support ., . ~ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-13
Problem Determination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13
Network Asset Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13
Multiple Logical Terminals (MLT) . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13
Country Extended Code Page (CECP) '. . . . . . . . . . . . . . . . . . . . . . . .. 7-14
Type 1 and Type 2 Communication Adapter for Models 1L and 3R ...... 7-14
Attaching Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14
Micro.code Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15
IBM 3174 Configuration Support A . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15
IBM 3174 Configuration Support S . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18
3174 Storage Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18
Local Customization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18
3174 Model 1L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-19
7-203174 Model 1R
7-21
3174 Model 2R
7-22
3174 Model 3R
7-23
3174 Model51R
7-24
3174 Model 52R
7-24
3174 Model 53R
7-25
3174 Model 81 R
7-25
3174 Model 82R
Chapter 8. Optional System Components . . . . . . . . . . . . . . . . . . . . . . . .
3299 Terminal Multiplexer Models 2 and 3 . . . . . . . . . . . . . . . . . . . . . . . .
3814 Switching Management System . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5209 Link Protocol Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

vi

IBM 3270 Information Display System Introduction

8-1
8-1
8-3
8-4

Chapter 9. Functional Control Capability. . . . . . . . . . . . . . . . . . . . . . . . . 9-1

Chapter 10. System Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Token-Ring Network Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loop Attachment Using SDLC Protocol . . . . . . . . . . . . . . . . . . . . . . . . . .
Communication Networks and Modems . . . . . . . . . . . . . . . . . . . . . . . . .

10-1
10-1
10-1
10-2
10-3
10-3

Chapter 11. Programming Support . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Telecommunication Access Methods . . . . . . . . . . . . . . . . . . . . . . . . . . .
Network Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cross-Industry Licensed Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Information Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Development Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Office Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Base Data Communication Systems . . . . . . . . . . . . . . . . . . . . . . . .
Interactive Programming Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other Licensed Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11-1
11-1
11-1
11-1
11-2
11-2
11-2
11-2
11-3
11-3
11-3

Chapter 12. Installation Planning and Customer Setup

12-1...............

Chapter 13. Problem Determination

13-1

List of Abbreviations

X-1

Glossary................ .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-9

Index· . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-21

Contents

vii

viii

IBM 3270 Information Display System Introduction

Figures
1-1.
2-1.
3-1.
3-2.
3-3.
3-4.
4-1.
4-2.
4-3.
4-4.
4-5.
4-6.
4-7.
4-8.
5-1.
6-1.
6-2.
6-3.
6-4.
6-5.
7-1.
7-2.
7-3.
7-4.
7-5.
7-6.
7-7.
7-8.
8-1.
8-2.
8-3.

1-2
Overview of the IBM 3270 Information Display System A~tachment "An Example of a Formatted Entry . . . . . . . . . . . . . . . . . . . . . . . . 2-2
IBM 3191 Display Station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
IBM 3193 Display Station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
IBM 3194 Display Station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
IBM 3290 Information Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
IBM 5560 Multiworkstation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
IBM 6150 RT Personal Computer Model 25 . . . . . . . . . . . . . . . . . . 4-4
IBM 8525 Personal System/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
IBM 8530 Personal System/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
IBM 8550 Personal System/2 . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
IBM 8560 Personal System/2 . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
IBM 8570 Personal System/2 . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
IBM 8580 Personal System/2 . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
IBM 3270 Personal Computer Keyboard . . . . . . . . . . . . . . . . . . . . 5-2
IBM 4224 Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
IBM 4234 Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
6-5
IBM 4245 Printer
6-6
IBM 4250 Printer
6-7
IBM 5210 PrinterOverview of 3270 and ASCII Terminal Emulation . . . . . . . . . . . . . . 7-3
Central Site Customization . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
Intelligent Printer Data Stream . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
IBM Token-Ring Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11
Terminals Supported by 3174 Subsystem Control Units . . . . . . . . 7-16
IBM 3174 Subsystem Control Unit Model1L . . . . . . . . . . . . . . . . 7-19
IBM 3174 Subsystem Control Unit Model 51R . . . . . . . . . . . . . . . 7-23
IBM 3174 Subsystem Control Unit Model 81R . . . . . . . . . . . . . . . 7-25
IBM 3299 Terminal Multiplexer . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
IBM 3814 Switching Management System . . . . . . . . . . . . . . . . . .. 8-3
IBM 5209 Link Protocol Converter . . . . . . . . . . . . . . . . . . . . . . . . 8-4

Figuresix

X

IBM 3270 Information Display System Introduction

Summary of Changes

Twenty-Third Edition (October 1988)
This edition adds information on the following products and features supported by
the IBM 3174 Subsystem Control Unit:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

3174 Storage Expansion
Central Site Change Management
20 Megabyte Fixed Disk Drive
IBM Token-Ring Network 3270 Gateway for Remote 3174 Models
Network Asset Management
Multiple Logical Terminals
Country Extended Code Page
Type 1 and Type 2 Communication Adapters for Models 1Land 3R
IBM PC/Host File Transfer and Terminal Emulater Program (FTTERM)
3191 Display Station
3192 Display Station
3194 Display Station
3812 Pageprinter6262 Printer Models 012 and 014
IBM 8525 Personal System/2
IBM 8530 Personal System/2
IBM 8550 Personal System/2
IBM 8560 Personal System/2
IBM 8570 Personal System/2
IBM 8580 Personal System/2.

Summary o't Changes

xi

xii

IBM 3270 Information Display System Introduction

Chapter 1. Introduction
For developing, tracking, and sharing information, the IBM 3270 Information
Display System is a business tool for today and the future. Its display terminals
and keyboards can be used by people in many different roles - managerial,
professional, secretarial, clerical, or data processing.
In the office, computer systems support administrative procedures. They offer
word processing for correspondence, electronic message systems for
person-to-person communication, teleconferencing services, online calendars, anda link to corporate files and outside services.
In many businesses, customers call by telephone to check on the status of theiraccounts, or to check on the disposition of an order. The speed with which adisplay station can produce information means customer waiting time will be kept
to a minimum. And for the display operator, obtaining that information from acomputer file is a quick and simple job.
With a display system, people do not have to be near their files to use them. Miles
away from the host computer, an operator can" quickly and easily gain access tofiles to read or update them. Because the host computer system is capable ofprocessing different jobs at the same time, people sitting at adjacent terminals canbe doing completely different work.

Components
The IBM 3270 Information Display System is a family of products that can be
configured together in a subsystem: dis"play stations with keyboards; printers; IBM
personal computers; and control, units. From a selection of components, you cantailor a computer system to fit your needs for the display of textual, numeric, andgraphic material. The various models of each product have a full complement ofstandard features, so thqt configuring a system is a straightforward task. Special
features for a particular model can be ordered easily. Figure 1-1 provides an
overview of the components that can be attached in an IBM 3270 Information
Display System.
Display stations give their operators quick access to data, stored in a computer, ina conve'nient form. The display image is clear, stable, and bright. To reduce glare,
the display screens have either an etched surface or a filter bonded to theirsurface. One way of entering information into the system is with the keyboard
connected to the display station. After being typed, each character immediately
appears on the display screen. Using color, graphics, and special highlighting, thedisplay station operator can create suitable formats for displaying data.
Printers are available in tabletop models or as larger, floor-standing units. They
are distinguished by their printout: dot matrix or letter-quality type. Models vary
according to print rate, and certain models print in four or seven colors.

Chapter 1. Introduction

1-1

Host System

TelecommunicatiOnsl
NetWorks
Channel,\\\0

Control unit

Terminal
Multiple)(erswitching
Management
systems

switching
Management
Systems~~

Printers

OEM Devices& SubSystems

OEM Devices& SubSystem

Display
Stations

Display
Stations
personalcomputers

Personalcomputers

Figure1-2entn1-1. overview ot the ISM 3270 Intormatio DIsplay system Allachm

IBM 3270 Intormalion Oisplay system IntroductiOn

The control unit links the display system to a central computer, or data processing
system, called the host. The control unit controls the operations of the display
stations and printers attached to it. The component configuration can be a clusterof 24 (or fewer) ASCII devices linked to a separate control unit.

Highlights
The components in the 3270 Information Display System are an attractive addition
to the office environment. They can be arranged to create individual work stations
that make efficient use of available space.
Comfort is a key to productivity. The keyboards are angled for typing ease, and onsome models the operator can adjust the angle. The display screens are designed
to reduce glare, and on several models the screen can be tilted for more
comfortable viewing.
The components in the 3270 system each have unique features. Some of thehighlights are:Keyboards• A selection of typewriter, data entry, APL2, Text, modifiable, and IBM
Enhanced keyboards are available.
IBM Modifiable Keyboard Layout:
Typewriter
Data Entry
APL2
Text.
IBM Enhanced Keyboard Layout:
Typewriter.
Display Stations• Screen formatting and editing• A choice of typing in only uppercase letters or in mixed uppercase andlowercase letters• An operator information area at the bottom of the display screen (outside
the data area) to communicate the status of the terminal, cluster, or system
to the operator• Image - A rectangular, two-dimensional array of picture elements (PELs)(see "Image" on page 2-5).
• Color capabilities• Graphics capabilities• Display highlighting:Reverse video, to reverse the color of a character or field with thecolor of the screen background
Blinking of a character or field
Underscore of a character or field• Programmed Symbols, a feature that allows an organization to define as
many as six character sets or fonts, to extend the range of special
characters, symbols, or signs that can be displayed or printed• Selector light pen and Cursor Select key to select certain fields of data on
the display screen for the program to process

Chapter 1. Introduction

1-3• The 3290 information Panel and the 3194 Display Station can display
several screens simultaneously for viewing. The operator can move fromone screen to another and choose to make one or more of the viewing
screens an area for copying from other screens.
Printers• Multifunction nonimpact page printer• Dot matrix or letter-quality printout• Color-printing capabilities• Programmed Symbols, a feature that allows an organization to define as
many as six character sets or fonts, to extend the range of special
characters,. symbols, or signs that can be printed• Underscore on color and monochrome printers.
IPDS Support

•
•
•
•
•
•
•

Text
Image
Graphics
Overlays
Bar Codes
Load Fonts
Page Segments

Cabling• The 3299 Terminal Multiplexer, which provides significant cable savings
when used to attach terminals to a 3174 control unit
Programming• APL2 capabilities• Personal Computer capabilities• Graphics capabilities• Image capabilities
Security•••

A security keylock and an operator identification card
A magnetic slot reader and magnetic hand scanner for reading
magnetically encoded data
Encryption/decryption capability; allows transmitted data to be scrambled
or unscrambled for security purposes between a host computer and a 3174
control unit.

Network Management•

Response Time Monitor (RTM)

A means of accurately measuring, recording, and displaying end-user
response time. The Response Time Monitor records the time between theoperator's pressing the Enter key and the host's handling the data andreturning it to the display screen. Gathering such information over a
period of time produces response time statistics that are useful for network
management and evaluation.

1-4

IBM 3270 Information Display System Introduction•Network Asset Management

Network Asset Management supports host requests, through the Systems
Network Architecture (SNA) network, for Vital Product Data informationfrom the SNA 3174 and attached supported devices. The host candynamically request the collection of product identification information(such as Machine Type, Serial Number, Model Number, Plant of
Manufacture, Product Class (IBM/non-IBM), Power on information) fromsupported network components. This information will be available fromthe host upon request.
• Central Site Change Management (CSCM)

Central Site Change Management allows the user to distributeelectronically customization parameters or microcode to Systems Network
Architecture (SNA) 3174 Subsystem Control Units that are serviced from acentral site. CSCM requires the Central Site Customization Utility toestablish and maintain the central site library on a 3174 (except Model 81 R
or 82R) that has been designated as the central site control unit.
•

Central Site Customizing Utility (CSCU)

Central site customization provides the ability to create and maintain, at a
central site, a library that contains control unit parameters for all the IBM
3174 Subsystem Control Units in a network. CSCU also makes it possible
to generate customized diskettes for the network 3174s.

PrograOmming Support
IBM has developed an array of operating systems, telecommunication accessmethods, and licensed programs for the 3270 Information Display System. The
programs cover defined areas in financial management, personnel, trend analysis,
document composition, graphic display, and airline control systems. Check withyour IBM marketing representative for details on programming support available
for the 3270 system.

Customer Setup
Certain components are designated as customer setup units, which offer
advantages for the customer - early availability and greater flexibility in the
installation and relocation of the components.

Problem Determination
The problem determination and recovery procedures designed for the operator touse with the 3270 units ensure that more computer time is available to thecustomer. The handy Problem Determination Guide included in most keyboards
explains basic problems the user might encounter and suggests actions to take.
The Alert function assists the system operator with network problem determination.
This function enables the 3174 control unit to send error messages about problems
in the system to the system operator. The operator can use the Alert function to
analyze the error.

Chapter 1. Introduction

1-5

1-6

IBM 3270 Information Display System Introduction

Chapter 2. Capabilities of the 3270 System
The 3270 Information Display System consists of terminals directly attached to aoontrol unit. Personal computers can operate as independent terminals orcommunicate with each other on a common IBM Token-Ring. A problem
determination procedure is built into the system to expedite analysis andcorrection. The system is used for inquiries to hosts, IBM Token-Rings, or othertermi nals on the system, data entry, personal computing, interpersonal computercommunication, document development, program development, and monitoring ofsystem activities. Versatile features such as color and programmed symbols usedin these applications help you produce information in an attractive and usefulformat.

Inquiries
In a simple inquiry, an operator may type a small input message - a name or an
account number - that elicits a short and quick output response, such as "yes" or"no." A credit house might use the inquiry to determine a customer's credit status
before allowing additional purchases.
In a complex inquiry, the operator types a small input message (up to 100
characters) that elicits a large output message (an enti re screen or several
screens of data). A credit house uses a complex inquiry application to get acomplete credit history of a person who is trying to establish credit.
An inquiry can include a file update. The input message is again relatively small.
The output message can be several screens of data, which the display operator
modifies. A credit house uses this application when it records credit payments.

Data Entry
The 3270 Information Display System has a number of features that simplify dataprocessing applications. The operator uses a keyboard, a light pen a magnetic slot
reader, or a magnetic hand scanner or a mouse. When large amounts of data areente red, such as with payroll or inventory control, keyboard entry can be used toenter data that will be processed separately by an application program. The
keyboard entry procedure is a highly productive and efficient method for copying
large amounts of data. Editing tools assist the operator to verify that the data
entered is correct. Formatted fields and protected data simplify and speed up thedata entry. With the magnetic hand scanner, the operator can read labels on
shelves and cartons; with the magnetic slot reader, the operator can readmagnetic-stripe tags on badges and credit cards.

Chapter 2. Capabilities of the 3270 System

2-1

The display operator can enter data as formatted or unformatted entries. In an
unformatted entry, the operator types in a customer's name and account number,and then types in an order: part number, quantity, price, and special instructions.
The sequence in which the items are entered is important, but the location of theitems on the screen is not. The data could be entered in one or two lines of type,or each item could be entered on a separate line.
In a formatted entry, the application program divides the screen into fields of data
and defines the type of information to be displayed in each location (see Figure 2-1
for an example). Using a formatted screen to type in a sell-stock order, theoperator would type data opposite the displayed labels.

ACCOUNT NUMBER:
STOCK IDENTIFIER:
QUANTITY:SELLING PRICE:

FigureACCOUNT NUMBER: 7246
STOCK IDENTIFIER: ABC
QUANTITY:
50 shares
SELLING PRICE:
5 1/2

2-1. An Example of a Formatted Entry

Depending on the application, the operator may take advantage of thesecapabilities to enter data:
Protected fields: In an application where certain information must be entered(such as renewal data for a driver's license, or a change of address), butwhere other information cannot be modified (driver's license number), theoperator is prevented from entering data in the protected fields. A protected
field is passed over by simply pressing the Tab key.
Special keys: The operator can change unprotected alphanumeric data. There
are special keys to change numeric-only data, or to erase the screen, a field,
or characters in a field. The two edit keys, Insert and Delete, are used tochange what has been typed.
Nondisplayed fields: If there are secu rity restrictions on some parts of a file,the display operator can enter data in those fields without their being displayedor printed. To do this, the operator must type in a special password or ID foraccess to the data. This 10 can also be typed in a nondisplayed field.
Highlighting: To help focus the operator's attention, selected data can beunderscored, made to blink, or be displayed at brighter intensity or in reverse
video. Symbols of different character sizes and fonts can be used to
distinguish different categories of information. On a color display screen, color
can accent different and related categories of information.

2-2

IBM 3270 Information Display System Introduction

Personal Computing
With an IBM 3270 Information Display System, executives and managers have all
the advantages of immediate access to information and the means to manipulate it.
The applications can be as simple as information retrieval, corporate
communications, and financial records - or as complex as "what if" scenarios.
Executives can generate their own reports, plan and track the development ofdifferent divisions, send mail electronically, gain access to public data bases, anduse an automated calendar program to keep track of their schedules. Personal
computing can be used for these tasks and more: file transfer, planning, modeling,
and Simulation; financial and statistical analysis; mathematical, scientific, andengineering problem-solving.
Patterns of personal computing vary widely. One professional may use a single
program package "as is," without any modifications. Others may write their own
programs, using a programming language oriented for end users. Still others may
have a data processing department to develop an interactive program for them.

Document Development
With the software you select, the 3270 display stations can be used to write memos,
letters, and reports, and to maintain mail logs. The Entry Assist function enables a
display station to operate much like a power typewriter. Entry Assist simplifies
page formatting and enhances existing editing capabilities.

Program Development
For programmers, the 3270 Information Display System provides interactive
facilities for creating, compiling, testing, and updating programs. Interactive
subsystems that provide program development facilities include the conversational
monitor system (CMS) under VM/370, System Productivity Facility (SPF) under thetime-sharing option (TSO), and Virtual Storage Personal Computing (VSPC) undermultiple virtual storage (MVS). With these facilities, programmers at 3270
terminals can create, compile, test, and update programs. The 3290 Information
Panel offers large-screen and split-screen options that can improve programmer
productivity.

Monitoring System Operation
A display screen can hold many system messages and display them faster than akeyboard printer. You can use the display station to control system operations byentering data into the system and receiving it from the system. If used only tomonitor system operation, the screen displays the status or operator messages,
but no data is entered into the system.

Chapter 2. Capabilities of the 3270 System

2-3

Color Applications
Because data presented in color is easier to separate visually, it is easier tounderstand. Base color -four colors-is provided on a field basis. Extended
color-seven colors -is available on a field and character basis. Using a color
display or printer, you can create distinctions that speed recognition of particularfields of data. Color makes these tasks easier:Distinguishing data sources: Differentiating data that has been entered at the
keyboard, data that has been program-generated, data that is held on file,messages from the host computer, and so on.
Distinguishing data types: Differentiating headings, field names, data as
originally entered, data entered and since changed, and instructions from theprogram.
Handling data codes: If the information displayed is categorized by a numericcode, about seven coded categories are the most that an operator can handle
readily. If an additional categorization coded in color is introduced, theoperator can handle a number of categories in each color.

Graphics
Pictures are an almost universal language, quickly comprehended. They convey
information more directly than words, by the use of patterns, shapes, and colors.
Converting numeric data into graphic form gives the data more meaning. Graphics
can be used for:
Scheduling: Through a computer network, several offices, in different
locations, can have simultaneous access to a graphic presentation of acomplex schedule. Color enhances scheduling.
Process Monitoring and Control: You can use graphics to create a flow
diagram indicating the status of a process or operation, such as any of theoperations in chemical processing plants and oil refineries. Use of color
assists the critically important interpretation of the data in such diagrams.
Graphic Arts and Publishing: Graphics, especially color graphics, haveconsiderable potential in the fields of graphic design, composition, andillustration.
Computer-Assisted Instruction: Particularly when combined with color,graphics will improve the quality and effectiveness of computer-assisted
instruction and online tutorial material.
Technical Data Analysis: Researchers and development professionals canpresent numeric information in graphic form to improve comprehension andproductivity.
Business: You can create your own forms for payroll, billing, reports, andorders.
Engineering: Graphics are used for representation of data reduction andanalysis, and for modeling and simulation in engineering applications.

2-4

IBM 3270 Information Display System Introduction

Programmed Symbols: Alphanumeric and Graphic Applications
The Programmed Symbols feature allows you to store, under program control, as
many as six character sets or fonts defined by your organization. This extends therange of special characters, symbols, or signs that can be displayed or printed in
the text. Programmed symbols are a standard function of some display stations;for other display stations and printers, they are available as a special-orderfeature. An Attribute Select Overlay keyboard (used with programmed symbols)
has a special narrow key top for templates with special font symbols. The templateis placed over the keyboard for reference when symbol sets are used.
Programmed symbols can be defined as:• Characters of different sizes• Characters from foreign alphabets• Mathematical signs and symbols• Scientific signs and symbols• Special type fonts, such as italic• Shapes or picture components.
When programmed symbols are defined as shapes or picture components, you can
use them in combinations to create pictures on the screen or printed page.

Vector Graphics
With vector graphics available on 3192-G and certain 3270 Display Cards of
Personal Computer and Personal System/2 workstations, complex graphics can becreated and manipulated to suit a variety of host-interactive and personal computer
applications. Graphics are drawn by a comprehensive set of vector graphic
instructions such as line, arc, and image, and attributes such as color and line
width. Drawing controls such as scaling (reducing or enlarging all or part of apicture), rotation (changing the orientation of all or part of a picture), and projection(obtaining a selected two-dimensional view of a three-dimensional object) allow
graphics to be manipulated once they are created.
To improve host performance and reduce the demands on the network and control
units, vector processing:••

Is handled by the workstation instead of the host
Provides an economical data stream.

Image
Image is a rectangular, two-dimensional array of picture elements (PELs).
An image is characterized by its size and resolution. The size of an image isrepresented by its width and height in PELs, and the resolution by the number ofPELs per inch. (The physical size of an image can be obtained by dividing the sizein PELs by the resolution.)

Chapter 2. Capabilities of the 3270 System

2-5

Security Enhancements
Security Keylock: A key can be used to disable the display station or printer(where available) whenever it is to be left unattended. The equipment can be used
only when the proper key is Inserted in the lock and turned to the ON position.
Magnetic Slot Reader (3278 and 3279 display stations): This accessory attaches tothe display station with a cable and is used to send coded messages to the hostsystem. For personal identification, magnetic-stripe tags and badges can bepassed through a slot in the reader, which has three indicators and a buzzer thatprovide information on the status of the read data.
Magnetic Hand Scanner: This accessory attaches to the display station with acable and, like the magnetic slot reader, can be used to read magnetic-stripe tags
for security purposes. The scanner can read magnetic-stripe labels on objects,
and magnetic-stripe tags that are hand-held or placed on a flat surface. Threelights and a buzzer provide information on the status of the read data.
Nondisplay Keying Mode: A program can define fields that will accept data
entered from the keyboard but not display the data on the screen.
Encryption/Decryption: When used with other IBM Cryptographic Subsystemproducts and operating in a network governed by a Systems Network Architecture(SNA)/Synchronous Data Link Control (SDLC), this feature permits transmission of
encrypted data between the host computer and the control units 3174 Models 1R,
2R, and 3R.
The encrypted form of the transmitted data prevents unauthorized disclosure andmodification of the data, whether accidental or intentional.

2-6

IBM 3270 Information Display System Introduction

Chapter 3. Display Stations
A 3270 display station combines the functions of your pen and paper, typewriter,and files all into one machine. As you type words, information, and instructions at
the display keyboard, they appear on the display screen. Correspondence,
reports, records, and data bases can all be filed away and then be called back up
to the screen and modified whenever necessary. Using interactive programs, you
can also do planning, modeling, simulations, and statistical and financial analysis
at a display station.
The 3270 display stations vary in their physical design, yet they follow the samearchitecture and share a common data stream format. Their screens differ in size,
and the size of the characters and the space between the lines of type can varywith the display.
The color of the characters and of the background screen also depends on thedisplay device: The 3270 display station images are clear and stable. On somemodels, the brightness can be adjusted. To help reduce glare, the display screens
have either an etched surface or a filter bonded to their surface.

Chapter 3. Display Stations

3-1

Figure3-1 . IBM 3191 Display Station

3191 Display Station
The IBM 3191 Display Station (shown in Figure 3-1 ) is an economical monochrome
CRT. Models A and Bare 1920 character 12-inch CRTs . Models D,E, and L are
1920 or 2560 character 14- inch CRTs.

3-2

IB M 327 0 Informat ion Display System Introduct ion

Highlights of the 3191 are:•

Improvement/performance
Economical
New extended warranty
Alert functions for maintenanceSelector Light Pen (Model L only) -a hand-held device that permits theoperator to select fields of data from a display for input to the host system
Printer port for local screen copy (Model 0, E, and L only)
Compatibility
IBM 3270-compatible.
Vital Product Data Support (except Models A and B)• Screen characteristics
All models have a smudge-resistant screen
80 columns by 24 rows plus the operator information area (Models A and B
only)
80 columns by 32 rows plus the operator information area (Models O,E,
and L)
Large characters
Nonglare steady image
Auto-dim feature•

Keyboards
102-key Enhanced keyboard
104-key typewriter keyboard
122-key typewriter keyboard
Keystroke record/play (Models D,E, and L)
Coiled keyboard cable
Home-row indicator keys•

Ergonomics
Smaller, lighter-weight video unit
Ti It/swivel pedestal
Small footprint
Low-profile keyboard with two angles of inclination.

Chapter 3. Display Stations

3-3

3192 Display Station
The IBM 3192 Display Stations are high quality, 14-inch color or 15 inch
monochrome CRT Display Stations with smudge resistant screens.
Highlights of the 3192 are:
• Improvement/performance'
Vital Product Data Support (except Model G)
Cursor speeds selectable (except Model G)
Volume control for keyboard click
IBM 3270-compatible
Printer port for local screen copy
Host addressable print support for printers attached to displays (Model G
only)
Print buffer for graphic screen print (Model G only)
Screen margin option
Record/play/pause; rule; vertical scroll (except Model G)
Selector Light Pen (Model L only) -a hand-held device that permits theoperator to select fields of data from a display for input to the host system.

3-4

IBM 3270 Information Display System Introduction•MonitorModel C provides 7-color 14-inch CRT with 80 x 24 or 80 x 32 characters
Model 0 provides a green monochrome 15-inch CRT with 80 x 24,80 x 32,
80 x 44, or 132 x 27 characters
Model F provides 7 color high-resolution 14-inch CRT with 80 x 24, 80 x 32,
80 x 44, or 132 x 27 characters
Model G provides 7 color 14-inch CRT with 80 x 24 or 80 x 32 characters
Model L provides a green monochrome 15-inch CRT with 80 x 24, 80 x 32,
80 x 44, or 132 x 27 characters with a selector light pen capability
Model W provides a black on white 15-inch CRT with 80 x 24,80 x 32,80 x
44, or 132 x 27 characters
Etched, enhanced contrast CRT screen designed to reduce light reflections
and fingerprint smudges to produce high-quality, high-resolution output
A video pedestal is provided as standard equipment.
• Keyboards
102-key IBM Enhanced Keyboard (except Model G)
104-key typewriter keyboard
122-key typewriter keyboard
104-key typewriter/APL2 keyboard (Model G only)
122-key typewriter/APL2 keyboard (Model G only)
Keystroke record/play (except Model G)
Customer modifiable keyboard.
• Ergonomics
Tilt/swivel pedestal
Low-profile keyboard with two angles of inclination. (Model G has three
angles of inclination).

Chapter 3. Display Stations

3-5

Figure3-2 . IBM 3193 Display Station

3193 Display Station (Models 1 and 2)
The IBM 3193 Display Station (shown in Figure 3-2) is a high-resolution,
portrait-type, monochrome, 380-mm (15-inch) CRT image display providing up toletter or A4 size document display capability in addition to alphanumeric data.
Compressed images can be sent to the 3193 from a scanner, and decompression is
performed in the 3193 . Image data compression is a technique to savetransmission time and reduce storage requirements.

3-6

IBM 3270 Information Display System Introduction

The 3193 is designed for operator comfort. The anti-reflection treatment minimizes
glare. Two new cursors are provided in the image partition in addition to thealphanumeric cursor. These are a cross and a rectangular cursor. Each image
cursor informs the host program of a point on the screen. An adjustable volume
alarm is provided for operator alert. The video element can be tilted and swiveledto change the operator's viewing angle.
••

Model 1 has a 122-key typewriter keyboard.
Model 2 has a 102-key IBM Enhanced keyboard.

Characteristics that apply to both models are:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

High-resolution screen with 880 x 1152 dots
3278 Model 2, 3, and 4 screen support
Display of 80 characters x 48 line screen support
Three workstation elements (video, logic, and keyboard)
Image data stream support
Up to two logical terminal capabil ity
Up to eight partitions
Enlarge partition
Entry assist function
Alert and response time monitor
DFT attachment to IBM 3174s except Models 81R and 82R
DFT attachment to IBM 3274
Non-SNA and SNA channel and BSC/SNA remote attachments
Tilt and swivel video base
Security keylock
Scanner attachment. (See the IBM 3193 Display Station Description,
GA 18-2364, for scanner attachments.)

Chapter 3. Display Stations

3-7

Figure3-3 . IBM 3194 Display Station

3194 Display Station
The IBM 3194 Displays (shown in Figure 3-3) are advanced-function, easy-to-read,
12 or 14-inch color or 15-inch monochrome display stations .

3-8

IBM 3270 Information Display System Introduction

Highlights of the 3194 are:•

Logic element
Small footprint (14.5 inches x 13.4 inches x 3.2 inches, 14.3 pounds)
3270 communication adapter
Integrated 1.44MB diskette drive
Security keylock
Personal Printer interface
File transfer
Two feature card positions
Communications support for one session of the 3194 as an ASCII session
Vital product data support.

•

Monitors
Model C provides a 12-inch color monitor in 80 x 24 or 80 x 32 characters
Model H provides a 14-inch color monitor in 80 x 24,80 x 31,80 x 44, or 132
x 27 characters
Model D provides a 15-inch monochrome monitor in 80 x 24,80 x 31,80 x
44, or 132 x 27 characters
Easy-to-read fontHigh-resol ution monitors
Advanced screen management with windowing
Multiple screen formats
Device Function Interface (Customer program execution interface)•

Keyboards
102-key IBM Enhanced Keyboard
104-key typewriter keyboard
122-key typewriter keyboard
Flexible coiled cables for easy movement
Adjustable keyboard angle for maximum comfort
Keystroke record/play
Customer modifiable keyboard•

Ergonomics
Tilt/swivel pedestal- Low-profile keyboard with two angles of inclination

Chapter 3. Display Stations

3-9

Figure3-4. IBM 3290 Information Panel

3290 Information Panel
The IBM 3290 Information Panel (shown in Figure 3-4) is a display station thatfeatures a large, flat plasma panel as its visual display medium. The
smudge-resistant screen can display as many as 9920 characters (62 rows by 160
columns). The panel can be tilted forward or backward , and the slope of the
keyboard and optional keypad can be adjusted .
Multiple-screen view i ng capability means that the 3290 wi" operate as many asfour display stations (logical terminals) simultaneously at the one physicalterminal . A" four screens can appear together , and each can interact
independently with its own host program. The operator uses the keyboard to wor kwith each of the displayed terminals, one at a time . The viewing area can display
concurrently four 3278 Model 2 screens , or two 3278 Model 3 screens , or two 3278
Model 4 screens , or one 3278 Model 5 screen . The 3290 can also display a fullpage of 132-column computer printout or two pages of 80-column text.

3-10

IBM 3270 Information Display System Introduc tion

The 3290 keyboard is available in a Typewriter or APL layout.
• The operator selects the desi red screen configuration for screen splits, andcan set up one or more of the screens as a copy screen for the active screen.
The copy screen can then be used as a reference when the operator modifies
the data displayed on the active screen.
• The customer can develop as many as six sets of Programmed Symbols, for avariety of shapes, fonts, and symbols.
•

Using the Keyboard Definition function, the customer can develop as many as
three alternative keyboard layouts for particular applications, in addition to thestandard keyboard layout.

• With Entry Assist, the 3290 can operate much like a power typewriter.
Capabilities include setting left and right margins, tabbing, a bell to signal theend of the line, cursor movement by word, and the word-wrap mode, which
automatically moves the last word on a line to the next line if it would overrun
the right margin.
• The rule line is a viewing aid that can be set to move up or down on the screenwith the cursor; otherwise, it is stationary. This horizontal line is a full screen
in width and can be turned on or off.
• The image of one displayed screen, or of a partition, can be enlarged bypressing a designated key.
•

Under program control, the screen can be divided into as many as 16
partitions.

• The 3290 attaches to any model of the 3174 Subsystem Control Unit, except
Models 81 Rand 82R, and certain models of the 3274 Control Unit.
The 3290 provides data stream compatibility- with the 3278 and 3279 display
stations. Existing alphanumeric applications run on the 3290 displayed in theircurrent screen size. No programming changes are required for current
alphanumeric applications unless the program is affected by 3174 or 3274 control
unit configuration restrictions (no Category B terminals, 3279 extended color, etc.)
or by required hardware functions not available with the 3290 (magnetic readers,
ASCII, Encryption/Decryption, color, etc.). The 3290 interacts with structured-fielddata-stream functions.
The mUltiple-screen facilities of the 3290 can be used without modifications tosystem software, with the exception of TSO/VTAM.

Chapter 3. Display Stations

3-11

3-12

IBM 3270 Information Display System Introduction

Chapter 4. IBM Personal Computers
The IBM Personal Computers are a family of workstations designed for bothprofessional and office use to meet the needs for interactive computing, whenconnected to a host computer, and for local personal computing. Described in thischapter are the IBM Personal Computers that attach to the 3270 Information
Display System:
•
•
•
•
•
•
•
•
•

5560/50/40 Multiworkstations
6150 RT Personal Computer all Models with 3278/3279 Emulation Adapter
6151 RT Personal Computer all Models with 3278/3279 Emulation Adapter
8525 Personal System/2 Model 25 with 3278/3279 Emulation Adapter
8530 Personal System/2 Model 30 with 3278/3279 Emulation Adapter
8550 Personal System/2 Model 50 with 3270 connection
8560 Personal System/2 Model 60 with 3270 connection
8570 Personal System/2 Model 70 with 3270 connection
8580 Personal System/2 Model 80 with 3270 connection.

Chapter 4. IBM Personal Computers4-1• ••••

Figure4-1. IBM 5560 Multiworkstation

IBM 5560/50/40 Multiworkstations
The IBM multistation family including the IBM 5560 , 5550, and 5540
Multiworkstations combines three roles into one. (Figure 4-1 shows the 5560.)
These workstations can all function as a Japanese-language personal computer forbusiness applications , a Japanese-language word processor, and aJapanese-language online communication terminal. Japanese language including
Kanji is a double-byte character set (DBeS), and these workstations also support
other languages . Every program in the extensive multistation software library canbe used on any of the workstations . This enables the user to share easily bothdata and programs. Each workstation consists of a system unit, a display, akeyboard, and, optionally , a printer.

4-2

IBM 3270 Information Display System Introduction

IBM 5560 Multiworkstation
High-speed and high-capacity data processing
Choice of two monitors: 24-dot color or monochrome
Displays of as many as 960 Kanji characters (40 characters x 24 lines), or 1920
alphanumeric characters (80 characters x 24 lines), with a resolution of 1066 x
725 dots in a 24-dot system• Kana/Roman-to-Kanji conversion in the workstation• Host-interactive color/Kanji graphics support under the Graphic Data Display
Manager (GDDM) and vector-to-raster conversion (Japanese 3270PC/G only)•••

IBM 5550 Multiworkstation•

Choice of four monitors:- 24-dot color or monochrome
16-dot color or monochrome• Displays of as many as 960 Kanji characters (40 characters x 24 lines), or 1920
alphanumeric characters (80 characters x 24 lines), with a resolution of 1066 x
725 dots in a 24-dot system• Kana/Roman-to-Kanji conversion in the workstation• Host-interactive color/Kanji graphics support under GDDM and vector-to-rasterconversion (Japanese 3270PC/G only)

IBM 5540 Multiworkstation
•
•

•

•
•

Low-profile compact design
Choice of two monitors:
24-dot monochrome
16-dot color
Displays of as many as 960 Kanji characters (40 characters x 24 lines), or 1920
alphanumeric characters (80 characters x 24 lines), with a resolution of 1066 x
725 dots ina 24-dot system
Kana/Roman-to-Kanji conversion in the workstation
Host-interactive color/Kanji graphics support under GDDM and vector-to-rasterconversion (Japanese 3270PC/G only)

Chapter 4. IBM Personal Computers4-3

Figure4-2 . IBM 6150 RT Personal Computer Model 25

IBM 6150 RT Personal Computer
The IBM 6150 RT Personal Computer is a powerful and extendable
work-station-oriented system for the personal computer requirements of thetechnical professional. (Figure 4-2 shows the Model 25.) An addition to thecomputer-related products, the IBM 6150 RT Personal Computer features a 32-bit
reduced instruction set microprocessor with virtual storage, as well as optional
Personal Computer compatibility for both program and hardware attachment. The
system is designed to satisfy the computing needs of academic, engineering andscientific, and Computer-Aided Design/ Computer-Aided Manufacturing(CAD/CAM) environments, with discipline-specific as well as personal productivity
appl ications.
Highlights of the 6150 are :
•
•
•
•
•

4-4

New high-performance 32-bit microprocessor
Hardware-assisted virtual storage management addressing to 1 terabyte
IBM Personal Computer family compatibility via optional IBM PC AT
Coprocessor Card
Open architecture, hardware and software
System storage with error correction code , with 1M bytes standard on the
Model 20 and 2M bytes on the Model 25 .

IBM 3270 Information Display System Introduction

IBM 6151 RT Personal Computer
The IBM 6151 RT Personal Computer is a powerful and extendable
work-station-oriented system for the personal computer requirements of thetechnical professional. An addition to the computer-related products, the IBM 6151
RT Personal Computer features a 32-bit reduced instruction set microprocessor
with virtual storage, as well as optional Personal Computer compatibility for bothprogram and hardware attachment. The system is designed to satisfy thecomputing needs of academic, engineering and scientific, and CAD/CAM
environments, with discipline-specific as well as personal productivity applications.
Highlights of the 6151 are:
• New high-performance 32-bit microprocessor• Hardware-assisted virtual storage management addressing to 1 terabyte• IBM Personal Computer family compatibility via optional IBM PC AT
Coprocessor Card
• Open architecture, hardware and software• System storage with error correction code, with 1M bytes standard on the
Model 10.

Chapter 4. IBM Personal Computers

4-5

Figure4-3 . IBM 8525 Personal System/2

IBM 8525 Personal System/2
The IBM 8525 Personal System/2 is a general-purpose computer system that
accepts most current adapters and offers approximately two times the processor
performance of the current 8088-based IBM Personal Computers. The 8525 uses
the 8086 processor and operates at 8MHz with no wait states to system memory.
Four models of the 8525 are available as workstations in a 3270 Information
Display System. The 8525 is offered in the following combinations:
•
•
•
•

4-6

Model 001
Model G01
Model 004
Model G04

IBM Space Savings keyboard , 12-inch monochrome monitor
IBM Enhanced keyboard , 12-inch monochrome monitor
IBM Spac\? Savings keyboard, 12-inch color monitor
IBM Enhanced keyboard , 12-inch color monitor.

IBM 3270 Information Display System Introduction

Highlights of the IBM 8525 are:•Approximately two times the processor speed of 8088-based IBM Personal
Computers• Graphics adapter displays up to 256 colors or 64 shades of gray (Multi-Color
Graphics Array)• Graphics adapter, diskette drive adapter, serial and parallel ports included• New design, smaller size with reduced power requirements• 12-inch color or monochrome graphics analog displays• Advanced technology eliminating customer setup switches
All models of the IBM 8525 have the following standard features:
•
•
•
•
•
•
•
•
•
•
•

512KB random access memory (RAM) expandable to 640KB on the system
board
Diskette adapter supporting up to two 3.5-inch 720KB drives
Multi-Color Graphics Array (MCGA) (R) with 64KB display buffer
Serial port
Parallel port
Pointing device port
Keyboard port
IBM Space Saving Keyboard or IBM Personal System/2 Enhanced keyboard
Audio earphone connector
Socket for a Math Co-Processor
One full-size and one 8-inch general-purpose slot to accommodate IBM 5150
Personal Computer, Personal Computer XT, and some non-IBM personal
computer option cards that do not exceed 20 millimeters (0.8-inch) thickness.

The integrated Multi-Color Graphics Array automatically uses up to 64 shades ofgray in converting color modes of operations for display on the IBM 8525-001 and8525-G01 (monochrome model). This allows users who prefer a monochrome
display to execute color graphics applications.

Chapter 4. IBM Personal Computers4-7

Figure4-4 . IBM 8530 Personal System/2

IBM 8530 Personal System/2
The IBM 8530 Personal System/2 is a general-purpose computer that can be used
as a workstation in a networking environment. The 8530 provides increased basefunction by combining existing personal computer functions with an integrated
graphics adapter and a parallel port. The system is based on an 8086
microprocessor running at 8MHz with no wait states and a 16-bit-wide data path tosystem memory .
Two models of the 8530 are available as workstations in a 3270 Information Display
System:•8530 Model 002
Central processing unit with a keyboard and two 720KB diskette drives .

•8530 Model 021
Central processing unit with a keyboard , one 20MB fixed disk with integrated
controller, and a single 720KB diskette drive .

4-8

IBM 3270 Information Display System Introduction

Highlights of the IBM 8530 are:
•
•
•
•
•
•

Integrated function including graphics and a parallel port
Displays up to 256 colors or 64 shades of gray
New design, smaller size with reduced power requirements
Compatible with IBM Personal Computer and Personal Computer XTWorld-wide power supply
system setup switches eliminated.

All models of the IBM 8530 have the following features:
•
•
•
•
•
•
•
•
•
•
•

640KB random access memory (RAM), 16-bit-wide data path to processor
Integrated diskette adapter supporting up to two 720KB drives
Multi-Color Graphics Array (MCGA)
Serial port
Parallel port
Pointing device port
Keyboard port
Enhanced personal computer keyboard
Time-of-day clock with extended-life battery
Socket for a Math Co-Processor
Three general-purpose slots to accommodate IBM Personal Computer and IBM
Personal Computer XT feature cards.

The integrated Multi-Color Graphics Array automatically uses up to 64 shades ofgray in converting color modes of operations for display on the IBM 8503
Monochrome Display.

Chapter 4. IBM Personal Computers4-9

...:._ aM . . . . . . "., __ . . , _ _ . . . . . . . _ _ _,,'\C...._M,.~,... _
_
_
_
_
_
...
_
___
__
._
. __
_
._
. , __ ....._-'

Figure

--1~-

~

-

4-5. IBM 8550 Personal System/2

IBM 8550 Personal System/2
The IBM 8550 Personal System/2 is a desktop personal computer system with
Micro Channel 'M architecture. The system unit features a 1OM Hz 80286
microprocessor, ROM BASIC and 1MB of memory on the system board ,expandable to 7MB with memory options.

™

Micro Channel is a trademark of the International Business Machines Corporation

4-10

IBM 3270 Information Display System Introduction

Highlights of the IBM 8550 are:
• Micro Channel architecture with a 16-bit bus• 10MHz processing speed• Multitasking and communications capabilities• A 20MB fixed disk and 1.44MB, 3.5-inch diskette drive• Feature integration on the system board which reduces the requirements for
optional adapters• Ease of installation and configuration• Universal, automatic voltage-sensing power supply.
Standard features on the IBM 8550 are:• 1.44MB, 3.5-inch diskette drive• 20MB fixed disk drive• Disk controller• Keyboard port
• Serial/asynchronous port
• Parallel port
• Pointing device port
• Video Graphics Array (VGA) port.
The IBM 8550 supports IBM 8503, 8512, 8513, and 8514 analog displays thattogether with the VGA built-in function provide significant graphics and text
capabilities. The VGA port supports graphics and text modes (including 640 x 480
graphics, 320 x 200 graphics in 256 colors, and 720 x 400 text).
Additional features of the IBM 8550 System Unit include: four 16-bit input/output(I/O) slots (with one slot occupied by the disk controller adapter), a time and dateclock with battery backup, an additional position for a second 3.5-inch diskette
drive, and the IBM Enhanced Personal Computer Keyboard.

Chapter 4. IBM Personal Computers

4-11

......

hFigure4-6 . IBM 8560 Personal System/2

IBM 8560 Personal System/2
The IBM 8560 Personal System/2 is a floor-standing member of IBM ' s System/2
family with Micro Channel architecture. The IBM 8560 features a 10MHz 80286
microprocessor, ROM BASIC , and 1MB of memory on the system board ,expandable to 15MB with memory options.

4-12

IBM 3270 Information Display System Introduction

Highlights of the IBM 8560 are:
• Micro Channel architecture with a 16-bit bus• 10MHz processing speed• Multitasking and communications capabilities• Significant graphics and text quality• 44MB or 70MB fixed disk and 1.44MB, 3.5-inch diskette drive• Feature integration on the system board which reduces the requirements for
optional adapters• Ease of installation and configuration• Universal, automatic voltage-sensing power supply.
Standard features on the IBM 8560 are:• 1.44MB, 3.5-inch diskette drive• Either a 44MB or 70MB fixed disk drive• Disk controller• Keyboard port
• Serial/asynchronous port
• Parallel port
• Pointing device port
• Video Graphics Array (VGA) port.
The VGA port supports graphics and text modes (including 640 x 480 graphics, 320
x 200 graphics in 256 colors, and 720 x 400 text).
Additional features of the system unit include: eight 16-bit input/output (I/O) slots(with one slot occupied by the disk controller adapter), a time and date clock withbattery backup, additional positions for a second 5.25-inch disk drive and for asecond 3.5-inch diskette drive, and the IBM Enhanced Personal Computer
Keyboard.

Chapter 4. IBM Personal Computers

4-13

Figure4-7. IBM 8570 Personal System/2

IBM 8570 Personal System/2
The IBM 8570 Personal System/2 is a desktop personal computer that enhances thePS/2 family of systems by offering a new level of performance in a desktop unit.
The system is highlighted by the Micro Channel architecture with a 16 or 20 MHz
80386 32-bit microprocessor, high-density memory technology, and a wide range of
integrated features . With the capability of supporting up to 16MB of high-speed
real memory, 60MB or 120MB of disk storage, advanced graphics, and an optional
80387 Math Co-Processor, this system provides significant performanceenhancements for desktop computer operations . The PS/2 Model 70 is compatible
with most existing software products for IBM personal computer systems.

4-14

IBM 3270 Information Display System Introduction

Highlights of the IBM 8570 are:
•
•
•
•
•
•
•
•

16 or 20 MHz 80386 32-bit microprocessor
Up to 6MB of high-speed memory on the system board
Large capacity 60MB or 120MB fixed disk with integrated controller
Micro Channel architecture with a 16-bit and 32-bit bus
Optional 16 or 20 MHz 80387 Co-Processor
Ergonomic desktop design
High level of feature integration on the system board
Ease of installation and configuration.

Standard features on the IBM 8570 are:• 1.44MB, 3.5-inch diskette drive• Keyboard port
• Pointing device port
• Serial/asynchronous port
• Parallel port
• Video Graphics Array (VGA) port.
The VGA port supports graphics modes including 640 x 480 graphics in 16
colors and 320 x 200 graphics in 256 colors, and text modes including 720 x 400
graphics in 16 colors (9 x 16 character box). The VGA port maintains
compatibility with Color Graphics Adapter (CGA) and Enhanced Graphics
Adapter (EGA) modes.
The fixed disk drives have a capacity of 60MB or 120MB. The controller is
integrated with the drive. The 60MB drive has an average access time of 27
milliseconds, and the 120MB drive has an average access time of 23
milliseconds.
'
The system has two levels of BIOS that total 128KB. The compatibility BIOS
(CBIOS) with memory addressability of up to 1 megabyte provides compatible
support for current application programs. An additional version of BIOS,
Advanced BIOS (ABIOS), provides support for multitasking operating systems
and has extended memory addressability up to 16MB.
The high level of feature integration on the system board reduces therequirement for optional adapters. Memory on the system board can be
expanded to 6MB. The optional 80387 Math Co-Processor provides enhanced
performance in arithmetic calculations. In addition, the system is designed fortool-free installation and includes security features in BIOS/CMOS and an
external keylock.
Additional features on the IBM 8570 are:• Three I/O slots (two 32-bit bus slots and one 16-bit bus slot with video
extension)• 132-watt automatic voltage-sensing power supply• Time and date clock with battery backup• Additional position for a second 3.5-inch diskette drive.

Chapter 4. IBM Personal Computers

4-15

Figure4-8 . IBM 8580 Personal System/2

IBM 8580 Personal System/2
The IBM 8580 Personal System/2 is a floor-standing personal computer designed tomeet the requirements of the multitasking environment. The IBM 8580 provides
32-bit large system architecture and function within an individual workstation. The
8580 system unit features Micro Channel architecture and a 20 MHz 80386
microprocessor partitioned into six functional units that process multiple
instructions Simultaneously. The Micro Channel architecture supports both 16-bit
and 32-bit 1/0 and memory adapter cards .

4-16

IBM 3270 Information Display System Introduction

Highlights of the IBM 8580 are:
• Micro Channel architecture with a 16-bit and 32-bit bus• 20 MHz processing speed• 80-nanosecond memory, 1-megabit chips, up to 16MB
• Multitasking and communications capability• Excellent graphics and text quality• Large-capacity 115MB fixed disk, 1.44MB, 3.5-inch diskette drive• Feature integration on the system board which reduces the requirements for
optional adapters• Ease of installation and configuration• Auto-restart power supply.
Standard features on the IBM 8580 are:•2MB of system board memory
Note:

128K bytes are reserved for high-performance BIOS.

• 1.44MB, 3.5-inch diskette drive• Fixed disk drive• Disk controller adapter• Integrated diskette controller• Keyboard port
• Serial port
• Parallel port
• Pointing device port
• Video Graphics Array (VGA) port.
The VGA port supports 640 X 480 graphics, 720 x 400 text, 320 x 200 graphics in
256 colors, and is compatible with the Color Graphics Adapter (CGA) and theEnhanced Graphics Adapter (EGA).
Additional features of the IBM 8580 System Unit include:••••

Eight I/O bus slots with five 16-bit and three 16/32-bit (one 16-bit slot is
occupied by the disk controller adapter)
A 225-watt universal power supply
A time/date clock with a long-life lithium battery
Additional positions for a second fixed disk drive and for a second 3.5-inch
diskette drive.

Chapter 4. IBM Personal Computers

4-17

4-18

IBM 3270 Information Display System Introduction

Chapter 5. Keyboards
The keyboard is a tool for controlling the display station, signaling the application
program, and entering information. A display keyboard looks similar to a
typewriter keyboard, but the characters you type are printed on the screen insteadof on paper. Using the keyboard, you can bring to the screen data that waspreviously entered at the keyboard and filed away.
For each 3270 display station there are several IBM keyboards, each with a key
layout designed to suit a particular job -such as word processing, data entry, or
programming. For some display models, you can define your own keyboard
layouts. All the keyboards have alphabetic keys, numeric keys, special symbol
keys, and control keys for entering information. Whatever your choice ofkeyboards, you will find that they are designed to be comfortable, easy to use, andversatile.
All alphanumeric, special symbol, and cursor-positioning keys are typematic.
When the key is held down, the character will be typed repetitively until the key isreleased.
The number of keys can range from 75 keys for the IBM 3278 Display Station to 122
keys on a 3270 Personal Computer keyboard (shown in Figure 5-1), except for the
124-Key Japanese Katakana.
Keyboards are available in a number of national languages. Displays with
typewriter, data entry, data entry keypunch, or APL2, Text keyboards may be mixed
when attached to a 3174 Subsystem Control Unit, but the keyboard languages must
be the same. Consult your IBM marketing representative for more information
about national-language keyboard versions and character sets.

Touch-Typing Controls
These controls are located in the touch-typing area of the keyboard, where thealphanumeric and graphic characters are found.
Note: The following functions are not available on all keyboards.
•
•
•
•
•
•
•
•

Alpha Shift: Overrides the numeric input field definition and the Keyboard
Numeric Lock condition to allow input of alphanumeric data in a numeric field.
Backspace keys: Press this key to move the cursor to the left, one character
position at a time.
Caps Lock: Locks the keyboard in uppercase shift.
Device Cancel key: Cancels a pending print request to the printer.
Enter key: Tells the program that you have completed your message and are
waiting for the information on your screen to be entered into the host system.
New Line key: Moves the cursor to the beginning of a new line.
Numeric Shift: Overrides the numeric field definition and the Numeric Lockcondition to allow entry of upshift characters.
Reset key: Used to recover from certain conditions and to cancel certain
operations.

Chapter 5. Keyboards

5-1

Figure5-1 . IBM 3270 Personal Computer Keyboard

5-2

IBM 3270 Information Display System Introduction• Quit key: Cancels the current action performed.
• Tab keys: Moves the cursor to the fi rst character position of the next
unprotected field.
• Uppercase Shift: Places the keyboard in uppercase.
• Uppercase Shift Lock: Locks the keyboard in uppercase shift.

General Controls
Located on the left side of the keyboard, most of these controls can be used inmany applications. Some of them are used only to place the keyboard ,in adifferent mode.
Note: The following functions are not available on all keyboards.
• Attention key: Provides a means of getting the program's attention. The
program that is operating in the host system determines how the Attention key
is used.
• Copy key: Copies data from one session to a copy area on the screen or toanother session on the screen.
• Cursor Select key: Duplicates the operation of the selector pen and is typicallyused to select items from a list, menu, or table.
• Doc On/Off: Puts the display in document mode, enabling the entry assist
functions.
• Enlarge: Changes the size of a window to fill the entire screen, withoutchanging the character size.
• Erasing controls-Clear, Erase Input, and Erase to End of Field keys: The
operator uses the Clear key to erase the entire display screen and the display
format. The Erase to End of Field key is used when the operator has enteredsome data into part of a field and wants the rest of the field erased. The Erase
Input key is used to erase all data input fields on the display screen.
• Extended Select Shift: Changes the function of certain program function keys
or extends the keyboard for such functions as remote communication andresponse time monitoring.
• Print key: Requests a printed (hard) copy of the information on the screen fromthe printer assigned to that display station.
• Record and Play keys: The Record key records sequences of keystrokes forautomatic playback using the Play key.
• Rule key: Places a horizontal line under the row containing the cursor on thescreen.
• Setup Mode: Allows you to change. the layout of the screen and select otherdefault options.
• System Request key: Can perform two different functions. It can be used tosend a signal to the host system to tell the program that you have a test
request message. Or it can be used to clear your display screen and switch
the display station between the application and control programs.
• Work Station Control Mode: Enables you to perform screen management
functions.
• Zoom: Causes the active screen to be displayed with the largest allowablecharacter size, filling the entire screen.

Chapter 5. Keyboards

5-3Screen Management, Program Access, and Editing Controls
The cursor is a movable marker that looks like a short underscore line; it indicateswhere the next character you type will be displayed. A visual aid, the cursor helps
you focus on the active area of the screen. It moves automatically across thescreen as you type. You can also control the cursor, moving it to any position on
the screen to indicate where to enter, replace, or delete characters.
To the right of the touch-typing area are the frequently used keys for screen
management, cursor positioning, editing, and program access.
Note: The following functions are not available on all keyboards.
•
•
•
•
•
•
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•

•
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•
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5-4

Backspace erase: In insert mode, deletes the character to the left of the cursor
position, with the cursor moving to the left, one position at a time.
Change Screen key: Displays the next screen or set of sessions after the one
currently displayed.
Cursor Home key: Moves the cursor to the fi rst nonprotected character
position on the screen.
Delete Word key: Deletes the word when the cursor is positioned at the firstcharacter of a word and the trailing space or null in an unprotected field.
Double-Speed Cursor, Left and Right keys
Duplicate key: Used during data entry to indicate that the field data from theprevious record should be duplicated.
Field Mark key: Used when operating with an unformatted display to indicate
the end of a field to the program.
Insert and Delete keys: Allow you either to add or to delete characters easily.
In the document mode, a typematic delete and a word delete are bothavailable.
Jump Partition (3290): Moves the cursor to the next partition on the screen.
Jump Screen: Moves the cursor to the next viewport or window on the screen.
Left and Right Cursor keys: Moves the cursor in the direction of the arrows.
Next Word key: Moves the cursor to the first character of the next word,
Previous Word key: Moves the cursor to the first character of the previous
word.
Program Access keys (PA 1, PA2, PA3): Send a signal to a program that
performs display operations; no input data from the screen is transmitted to theprogram.
Selectable Field Tab key: Moves the cursor to the first character position of
the next unprotected field.
Up and Down Cursor keys: Moves the cursor in the direction of the arrows.
3174 Entry Assist: Sends the information on the screen to the program.

IBM 3270 Information Display System Introduction

Program Function and Attribute Selection Controls
Note: The following functions are not available on all keyboards.
• Attribute Select keys: When supported under program control, these keys
select the extended highlighting, extended color, background transparency(3179 G unique), and programmed symbol attributes of the character that isbeing entered.
• Cursor Appearance keys, Alternate Cursor and Cursor Blink: Determine how
the cursor looks on the screen. The standard cursor is a nonblinking marker
that looks like an underscore. The other options are a reverse-image cursor (asmall rectangle which, when positioned on a character, changes the color of
the character to the color of the screen), a blinking reverse-image cursor, or ablinking cursor. The blinking cursor is useful for teaching new users, or for
screens filled with data, because it makes the cursor immediately obvious.
• Graphic Cursor ( + Cr) keys: Used to specify alternately which of the two
cursors, the alphanumeric or the graphic, is the active cursor. When theGraphic Cursor Mode indicator (+ Cr) appears in the operator informationarea, the graphic cursor is the current active cursor. Absence of this indicatormeans that the alphanumeric cursor is currently active.
• Program Function keys, PF1 through PF24: Pass input data from the screen
and send a signal to a program to call for a particular display operation, suchas splitting a line of text or moving from the middle of a file to its starting lines
on the viewing screen. Application programs can define the action that occurs
when any of the program function (PF) keys is pressed. The group of PF keys
and their functions can also be programmed as an operator desires, with eachkey set to perform a particular function.

KeypadA separately housed keypad (3290), an optional feature, is available for numeric
data entry or program function applications. It can be located on either side of the
keyboard to allow for left or right-handed use.

Keyboard Definition Utility
This precustomizing procedure (3179, 3180, 3191, and 3192) for the keyboards thatare modifiable allows you to create your own uniquely defined keyboard layouts bymodifying the keyboard tables in the 3174 or 3274 control unit. Certain keycaps are
removable and can be interchanged with other keycaps on the keyboard.
Square-shaped keycaps, like the alphanumeric and program function keycaps, areremovable and interchangeable; the larger-shaped keycaps-Shift, Tab, Reset,
Shift Lock, Carriage Return, Spacebar-and Alt keycaps are not. By modifying the
keyboard tables, and then moving keycaps about on the keyboard, the user candefine keyboard layouts to meet specific application requirements. A maximum offour keyboard layouts and their associated keyboard tables may be defined foreach 3174 Subsystem Control Unit and each 3274 Control Unit.

Chapter 5. Keyboards

5-5

5-6

IBM 3270 Information Display System Introduction

Chapter 6. Printers
The 3270 family includes both dot-matrix and line printers. The models vary in size
and in the print rate, vertical spacing, character pitch, and graphics capability thatthey offer. Though print rate is often an important consideration in selecting aprinter, the actual rate of output for a particular installation is affected by thecontrol unit configuration and line transmission speed, output format, colors
printed per line, and the programming application processing. When output isprinted in several colors, the print rate will be reduced in proportion to the numberof color changes on a page. Using the Programmed Symbols feature for dense
printing or for printing nonstandard character format also reduces the rate ofprinter output.

Chapter 6. Printers6-1

3812 Page Printer Model 2
The IBM 3812 Page Printer Model 2, a multifunction nonimpact page printer oftabletop design provides cut-sheet, letter-quality text, all-points-addressablegraphics and prints at 12 pages per minute maximum. Basic paper handling
functions include dual input cassettes for legal and letter size paper and gummedlabels.
The 3812 Model 2 also includes one megabyte of memory usable for printeroperations and resident font storage.
New optional features for the 3812 Model 2 permit attachment to the IBM 3270
Information Display System and provide advance print functions for VM, MVS, andSystem 36/38 environments.
Highlights of the 3812 Model 2 are:••••

One megabyte of printer working storage
Dynamic index of fonts on operational diskette
Image decompression support
Attaches to IBM 3270 Information Display Systems, 43XX Processors, and 9370
Information Systems• Support for composite page (text, image, graphics) on System/36• Support for text and graphics for the 370 environment• Support for advanced print functions in System/36 and System/38
environments.

6-2

IBM 3270 Information Display System Introduction

Figure6-1 . IBM 4224 Printer4224 PrinterThe IBM 4224 Printer attaches to the 3270 Information Display System through the3174 Subsystem Control Unit or the 3274 and 3276 control units. The 4224 is a
serial dot-matrix impact printer with graphic capability and four or seven color,depending on the model.
••••

Model 201 Model 202 Model 2E2 Model2C2 -200 characters per second (cps)
400 cps
400 cps (expanded storage)
400 cps (expanded storage and color).

Advance-print functions are implemented through the Intelligent Printer Data
Stream (IPDS) and supported by the Graphic Data Display Manager (GDDM) .
Highlights of the 4224 Printer:• Text• Image• Graphics• Overlays• Loaded Fonts• Page Segments

Chapter 6. Printers6-3

Figure6-2. IBM 4234 Printer4234 PrinterThe IBM 4234 Printer (shown in Figure 6-2) is a heavy-duty, intermediate-speed ,impact-matrix line printer using Dot Band technology. The 4234 is designed forcustomer setup.

6-4•

Three selectable print qualities and speed:
Draft (uppercase only) , 410 lines per minute
Data processing, 300 lines per minute
Letter quality, 120 lines per minute.

•
•
•
•

13.2-inch print line.
Vertical and horizontal fine adjustment.
Customer-changeable print band .
Clean hands, long-life ribbon-approximately 30 million characters.

IBM 3270 Information Display System Introduction

Figure6-3. IBM 4245 Printer4245 Printer Models 012 and 020
Models 012 and 020 of the IBM 4245 Printer (shown in Figure 6-3), with print ratesof 1200 and 2000 lines per minute respectively, are significant additions to the IBM
high-speed printer product line.
Standard features of these printers include optical character recognition (OCR)
printing support and field upgradability.

Chapter 6. Printers6-5

Figure6-4 . IBM 4250 Printer4250 PrinterThe IBM 4250 Printer (shown in Figure 6-4) is used for publishing applications. A
standing unit, this high-resolution printer produces camera-ready print masters
with text and line-art graphics intermixed. The 4250 uses a roll ofaluminum-coated , electrosensitive paper.
•
•
•

6-6

The print head speed is 1 meter per second (40 i nches per second) . All points
on the printable area of the page are addressable.
The printer attaches to any model of the 3174 Subsystem Control Unit.
The printer attaches to the Type A terminal adapter of the 3274 Control Unit
Models 31A, 310 , 41A, and 410 .

IBM 3270 Information Display System Introduction

Figure6-5. IBM 5210 Printer5210 Printer Models G01 and G02
The IBM 5210 Printer (shown in Figure 6-5) is a desktop impact printer that uses abidirectional printwheel to produce letter-quality output. The printer can be fed
cut-sheet paper, manually or automatically, or can be fed continuous forms . The
5210 employs a cartridge ribbon , and the Ribbon Saver allows two modes of ribbon
feed for two different qual ities of pri nt.
•
•
•
•
•

Model G01 , maximum print rate: 40 characters per second (96 characters ,10-pitch) .
Model G02, maximum print rate : 60 characters per second (96 characters ,10-pitch).
Print positions: 132 for 10-pitch , 158 for 12-pitch, and 198 for 15-pitch .
Vertical spacing : 3, 4, 5.3, 6, 8, 9.6, 12, 24 , and 48 lines per inch .
Character pitch: 10, 12, and 15 characters per inch.

Chapter 6. Pr inters6-7

6262 Printer Models 012 and 014
Models 012 and 014 of the IBM 6262 Printer (shown in -- Fig '6262P' unknown --)are impact printers that use a fully formed character printband. They print at 1200
lines per minute. Both models are suitable for either computer center orworkstation environments and can be attached to the 3174 and 3274 Models 41 and61 controllers, the 9370 Workstation Controller, and 4361 Processor Workstation
Adapter.
•••••

Simplified forms setup procedures
Smaller footprint: 64% of IBM 4245 Model 12 or 20
Convenient power requirement: 120V, single phase
Six-part forms capability
Four tractors.

Additional benefits of the 6262 Models 012 and 014 printers include standard OCR
alphanumeric printing and an aO-character Liquid Crystal Display panel display for
operator messages.

6-8

IBM 3270 Information Display System Introduction

Chapter 7. Control Units
The control unit is the vital link in the 3270 Information Display System, connecting
the display stations, printers, and personal computers to the host data processing
system. Display stations, printers, and personal computers attached to control
units can be installed in many different configurations, depending on the demandsof your business.
To select a control unit model that is suitable for your particular configuration, youneed to know the method by which the control unit will be attached to the hostcomputer (whether local or remote), the number and type of display stations andprinters to be attached to the control unit, and their base function and features.

3174 Subsystem Control Unit
The IBM 3174 Subsystem Control Unit is one of the basic components of the IBM
3270 Information Display System. The 3174 connects 3270 system terminals(display stations and printers) to the host data processing system.
The following features/functions are available with the 3174:
•
•
•
•
•
•
•
•
•
•
•
•
•
•

Central Site Customizing
Central Site Change Management
Storage Expansion
20MB Fixed Disk Drive
Multiple Logical Terminals
Country Extended Code Page
Intelligent Printer Data Stream
Asynchronous Emulation Adapter
Token-Ring Network 3270 Gateway
Response Time Monitor (RTM)
TOken-Ring Attachment
Serial Original Equipment Manufacturer's Interface (SOEMI)
Type 1 and Type 2 Communication Adapters for 3174 Models 1L and 3R
Network Asset Management.

The 3174 Subsystem Control Unit can be locally attached (channel-attached) or
remotely attached (telecommunications-attached) to a host system. IBM 3174
control units employ binary synchronous communication (BSC) or synchronous
data link control (SDLC), X.25 transmission disciplines in remote operations, andSystems Network Architecture (SNA) protocols or the host processor channel
program (non-SNA) in local operations.

Chapter 7. Control Units

7-1

Models
Model 1L, 1R, 2R, and 3R control units are available with a maximum of 32-ports;
Model 51 R, 52R, and 53R control units are available with a maximum of 16-ports;
Model 81 R. and 82R are available with a maximum of eight ports.
•

Model 1L provides an S/370-architecture channel interface for SNA andnon-SNA attachment to a host processor.

•

Models 1R, 51 R, and 81 R provide EIA 232D/CCITT V.24 and CCITT V.35
interfaces for SNA/SDLC, BSC, or X.25 remote (telecommunications)attachment.

•

Models 2R, 52R, and 82R provide an X.21 interface (CCITT V.11) for SNA/SDLC
or X.25 remote (telecommunications) attachment.

•

Models 3R and 53R attach to an IBM Token-Ring Network. Communication to
the host is through a gateway that can be either an IBM 372X or 3745
Communication Controller with the Network Control Program Token-Ring
Interface (NTRI) feature or a 3174 Model1L, 1R, 2R, 51R, or 52R with the
Token-Ring Network 3270 Gateway feature.
When a 3174 Model 1L control unit with the 3270 Gateway feature is providing
the gateway to the host, VTAM views the Model 3R or 53R as channel-attached;when the 372X, or 3745 Communication Controller is providing the gateway tothe host, VTAM views the Model 3R or 53R as a control unit on a switchedpoint-to-point line.

7-2

IBM 3270 Information Display System Introduction

Asynchronous Emulation Adapter
The Asynchronous Emulation Adapter (AEA) consists of both hardware andmicrocode and requires a second 1.2MB diskette drive or one fixed disk drive inthe 3174 Subsystem Control Unit. This adapter expands the connection capability
for 3270-type display stations and printers, allowing them to connect to American
National Standard Code for Information Interchange (ASCII) hosts and public data
networks, as well as allowing ASCII display stations and printers to connect to IBM
hosts, ASCII hosts, and public data networks. Figure 7-1 shows an overview of
3270 and ASCII terminal emulation.
• Three AEAs can be installed in Models 1L, 1R, 2R, and 3R of the 3174, for a
total of 24 AEA ports.
These device attachments are in addition to the maximum of 32 terminals.
However, the number of device addresses supported by non-SNA 3174 control
units is 32.
• One AEA can be installed in Models 51 Rand 52R of the 3174, for a total of eight
AEA ports.
These device attachments are in addition to the maximum of sixteen 3270-type
terminals.
IBM Host

ASCII Host

Public
Data
Networks

[D[]
I
I
I
I
I
I
I

ChannelorTP

RS-232D:_____________ .J

3174 with Asynchronous
Emulation Ad~pter:RS-232DL---

TI -------------,I
I
I
I
I
I

I

D

D
r===f
3270....b1llE::lll_~~

Display
Stations

FigurePrinters

---,d

Ir-I

ASCII
Display
Stations

Printers

7-1. Overview of 3270 and ASCII Terminal Emulation

Chapter 7. Control Units

7-3

Functional Description
The Asynchronous Emulation Adapter provides three major functions:• ASCII terminal emulation (IBM 3270 terminals emulating an IBM 3101 Display
Station, a DEC VT-1001, or an ASCII printer for connection to ASCII hosts or
public data networks)• 3270 terminal emulation (ASCII terminals emulating an IBM 3178 Display
Station Model C2, 3279 Color Display Station Model 2A, or 3287 Printer Model 2
for connection to an IBM host)• ASCII passthrough (ASCII terminals connecting to ASCII hosts or to public data
networks).

The Asynchronous Emulation Adapter supports duplex, character-mode,
asynchronous transmission of 7-bit ASCII (ANSI 3.4,1977) data with parity. Odd,
even, mark, space, and no-parity coding are supported. Ports can be configured in
combinations of ASCII terminal emulation, 3270 terminal emulation, or ASCII
passthrough. Each port provides an EIA 2320 electrical interface and supports
transmission speeds of 300, 1200,2400,4800,9600, and 19200 bits per second(bps) through modems over switched or nonswitched communication facilities or
through direct connection (without modems).

ASCII Emulation
Terminal: The following display stations are supported for ASCII terminal
emulation: IBM 3178, 3179 (Model 1 only), 3180, 3191, 3192, 3194 operating incontrol unit terminal (CUT) mode, 3278, 3279 (operating in four-color mode), and3270 Personal Computers operating in CUT mode.
Keyboard: The IBM typewriter, APL, and text keyboard types are supported
through special keyboard maps for the IBM 3101 and DEC VT-100 display stations.
Printer: The IBM 3230 Model 2, 3262 Model 3 or 13, 3268 Model 2, and 3287 Model
1 or 2 are supported for ASCII printer emulation. ASCII control sequences for thefollowing functions are supported: line feed, form feed, carriage return, bell, andtab-skip to the next multiple of 8 characters. The 3270 printer in this mode is used
only as a host printer.
Host Attachment: ASCII host attachment is through any of the adapter ports, as
specified on the destination menu.

1

VT-100 is a trademark of the Digital Equipment Corporation.

7-4

IBM 3270 Information Display System Introduction

3270 Emulation
Terminal: The following ASCII display stations are supported for 3270 terminal
emulation: IBM 3101, IBM 3151, IBM 3161, IBM 3162, IBM 3163 (supported as a3161), DEC VT-52, VT-100, VT-220 (emulating a VT-100), TeleVide0 2 912 and 970,
Lear Siegler ADM3 3A/5, 11/12, 11/78, ADDS Viewpoint4 A-2, Viewpoint 78, Esprit
78 5 , Hazeltine6 1500, and Hewlett Packard 7 2621 terminals. ASCII display stations
supported for 3279 2A emulation are the IBM 3164 and the DEC VT-241.

Compatible terminals that meet the requirements for attachment may connect tothe emulation adapter under the provisions of the IBM Multiple Supplier Systems
Bulletin.
Personal computers operating in emulation mode as one of the above display. stations can also attach to the 3174, provided that an emulation program isavailable and that it is compatible with one of the emulation adapter's keyboard
maps.
ASCII Display Host Addressable Printer (HAP): ASCII Display Host Addressable
Printer refers to the ability of the 3174/AEA to support a display and a printer,attached to the display's auxiliary port, over a single communication link. The
display and its attached printer appear as distinct addresses to the 3270 host. Hostapplications can communicate to both the display and the printer at the same timeover the same link. ASCII Host Display Addressable Printer (HAP) support
requires an ASCII display, operating in 3270 Terminal Emulation mode, capable ofsupporting an ASCII printer on an auxiliary port.
Keyboard: The user can choose between a generic keyboard map and a specificmap designed for each ASCII terminal supported.
Printer: The general requirements for ASCII printers to be supported for 3270
printer emulation (LU1 SNA character string [SCS] mode and/or LU3 3270
Information Display System data-stream compatibility [DSC] mode) are as follows:• Serial transmission• Equal transmit and receive speeds, which must be in the range of speeds
supported on the emulation adapter• Duplex character mode
• 7-bit code defined by ASCII (ANSI 3.4, 1977)• EIA 2320 electrical interface• A maximum of 132 print positions• ASCII commands supported:
Carriage Return (Control M; hex 00)
Line Feed (Control H; hex OA)
Bell (Control G; hex 07)

2

TeleVideo is a trademark of TeleVideo Systems, Inc.

3

ADM is a trademark of Lear Siegler, Inc.

4

Viewpoint is a trademark of Applied Digital Data Systems, Inc.

5

ESPRIT 78 is a trademark of Esprit Systems, Inc.

6

Hazeltine is a trademark of Hazeltine Systems Inc·.,

7

Hewlett Packard is a trademark of Hewlett Packard.
Chapter 7. Control Units

7-5

• Carriage return must not generate a line feed, nor can a line feed generate acarriage return.
• The printer must not be dependent on any delay characters to allow
mechanical motion.
Printers connected in this mode can be used as host printers, shared printers, andlocal copy printers.
Host Attachment: IBM host attachment is through the host attachment interface ofthe 3174 in which the adapter is installed.
Operator Indicator Line: Operator indicator status is provided upon request on the
24th or 25th line of the ASCII display station.
RTM and Alert: Network statistics for ASCII terminals are gathered in the samemanner as 3270 terminals connected to the 3174.
Typeahead: ASCII display station keyboards are not locked during a screen write.
This enables keystrokes to be entered while the screen is being updated, forgreater efficiency.

ASCII PassthroughThe emulation adapter can provide the connection between an ASCII terminal and
an ASCII host, using any ASCII host-configured port. Flow controls supported by
the adapter will prevent potential data overruns if supported by the hostconnection. If an overrun does occur, a message is sent to the display station
operator. Error checking is the responsibility of the ASCII host.

General Items Common to ASCII and 3270
Destination Menu: Prompts help the user determine how to connect with thedesired host application.
Modems: Supported are all nonswitched, limited-distance, and switched-line
modems that provide duplex asynchronous operation, support equal transmit andreceive speeds, and conform to EIA 2320 specifications on pins 1 to 8, 20, and 22.
Connections can be made through "smart" modems, such as the IBM 5841.
Transmission on/transmission off (XON/XOFF), data terminal ready (OTR), andclear to send (CTS) asynchronous flow controls are supported.
Security: Password access to the adapter is provided, and session security is
supported. When an ASCII device is in session with an IBM host and either
disconnects or exceeds the configurable inactivity timer, the 3174 terminates thesession. Security cannot be provided for host subsystems or applications (such as
the Information Management System [IMS]) that retain data between sessions in
the expectation that the same logical unit will come into session again.
If sensitive data is sent over external communication facilities, an encryption
scheme outside the capabilities of this feature should be used.

7-6

IBM 3270 Information Display System Introduction

Central Site Customization Utility (CSCU)
Central site customization provides the ability to create and maintain, at a central
site, a library that contains control unit parameters for all the IBM 3174 Subsystem
Control Units in a network. CSCU also makes it possible to generate customized
diskettes for the network 3174s.
Customizing
Data File ....- -...._ . .

----

-==

3174

US Mail

-----

--=

=
-

3174

3174

Figure7-2. Central Site Customization

=
=

3174

-=
=

-

3174

File MaintenanceFile maintenance for central site customization includes the ability to:••Create and maintain customizing records for all 3174 subsystem control units
on a control unit - by - control unit basis
Select customizing data records for generating diskettes on a control
unit - by - control unit basis.

HardwareCentral site customization is done from any 3174 Model 1L, 1R, 2R, 3R, 51R, 52R, or
53R. The central site customization utility requires that the control unit:•••

Be offline
Have a 3278 control unit terminal (CUT) or similar terminal attached to port 0
Have two diskette drives or one diskette drive and one fixed disk drive.

Host Support
No host support is required for central site customization. All network 3174
subsystem control units are supported, regardless of host protocols.

Chapter 7. Control Units

7-7

Central Site Change Management (CSCM)
CSCM allows the user to distribute electronically customization parameters or
microcode to Systems Network Architecture (SNA) 3174 Subsystem Control Units
that are serviced from a central site. CSCM requi res the Central Site
Customization Utility to establish and maintain the central site library on a 3174
(except Model 81 R or 82R) that has been designated as the central site control unit.
The customization parameters or data are electronically distributed by Version 1,
Release 2, of NetView Distribution Manager (OM) installed in the central site
MVS/370 or MVS/XA host. NetView OM uses LU 6.2 support provided in
ACF/VTAM, Version 3, Release 2, and defined protocols for managing changes anddata distribution using an enhanced Systems Network Architecture Distribution
Services (SNADS) format.
Customization parameters (the parameters contained in the central site library) aredistributed electronically to an SNA 3174 without disrupting normal workstation
operations. Electronic distribution of other data such as patches, new microcode
engineering change release levels, Request for Price Quotations (RPQs), or
downstream load (DSL) device code may require network site intervention,
depending on the 3174 model or the choice of hardware features in the remote
3174.
CSCM also makes it possible to perform an initial microcode load (IML) of theremote 3174 from the central site. Using the proper microcode will significantly
reduce the need for manual intervention at the remote site.
Although not required, the 20MB Fixed Disk Drive feature is desirable for the 3174
Subsystem Control Units that will participate in central site change management.
At central site control units, the 20MB Fixed Disk Drive improves usability byeliminating diskette swapping when libraries for large networks are being
maintained. For remote control units, it allows a backup copy of the current IMLControl disk microcode to be retained, when migrating to a new microcode
release.

20MB Fixed Disk Drive
The 20MB Fixed Disk Drive feature can be installed in all models of the 3174 except
models 81 Rand 82R. This feature is functionally equivalent to the diskette drives
available for the 3174. The advantage of this feature is the increased direct accessstorage device (DASD) storage, which also increases usability by reducing disketteswapping.
Two fixed disk drives can be installed on 3174 Models 1L, 1R, 2R, and 3R, and one
can be installed on models 51 R, 52R, and 53R. The 20MB Fixed Disk Drive can beinstalled in the field by the customer.

7-8

IBM 3270 Information Display System Introduction

Intelligent Printer Data Stream
The Intelligent Printer Data Stream (IPDS) is a structured field data stream
designed to manage and control printer processes. (See Figure 7-3.) It is easily
distinguished from previous printer data streams in that it supports all points
addressability (APA). The APA printing concept allows users to position text,
images, vector graphics, bar codes, and previously stored overlays at any point on
a page.
Host

APA PrinterFigure7-3. Intelligent Printer Data Stream

Functional Description
The IPDS is transmitted from an application to the printer within structured fields
that have been specifically designed for this purpose. The IPDS commands within
the data stream enable the host to control:••

Media handling
Downloading and managing of symbol sets (fonts) and printer-stored objects,
such as overlays and page segments.

The printer can later use the stored objects to construct a printed page. The IPDS
can significantly reduce the load on the host processor and the number ofcharacters transmitted to the printer in many advanced printing applications.

Chapter 7. Control Units

7-9

System Attachment
The IPDS is supported by:• IBM 3274 Control Unit (Configuration Support-D, Release 65)• IBM 3174 Subsystem Control Unit (Configuration Support A or S, (Release 2 orhigher).
Printers capable of IPDS will be supported by both SNA and non-SNA control units.
Attachment protocols are as follows.
• SNA- Channel-attached- SOLC-attached.
Note: Under SNA, support is limited to LU 1 only.

• Non-SNA- Channel-attached
SSC-attached.
Note: Under non-SNA, IPDS is only carried encapsulated in the 3270 data stream.

Programming Dependencies
The IPDS depends on programming support outside the 3274 and 3174 control
units.
The IPDS is dependent on the VTAM/NCP transmission subsystem to support
printer operations to a BSC-attached control unit. In a way that does not dependon the presence of a write control character (WCC) to indicate "start print" in thedata stream.

Error Reporting and Recovery
The IPDS exception conditions are detected by the attached printer and arereported (at the data stream level) to the application that generated the IPDS data.
The exception conditions are reported in an IPDS structured field called
Acknowledge (ACK) Reply.
The control unit has no knowledge of printer-detected IPDS exceptions and does
not take part in recovery except as directed by the application.

7-10

IBM 3270 Information Display System Introduction

IBM TOken-Ring Network 3270 Gateway Feature.

The 3174 Subsystem Control Unit Models 1L, 1R, 2R, 51R, and 52R with the IBM
Token-Ring Network 3270 Gateway feature provide for IBM Token-Ring Network
attachment to an SNA/SDLC host. Models 3R and 53R provide for attachment of a
3270 Information Display System to the Token-Ring Network.
The 3270 Gateway feature on Model 1L, 1R, 2R, 51 R, or 52R provides for datapassage between a host processor and workstations and the subsystem control
units attached to the IBM Token-Ring Network. 3174 Models 3R and 53R provide
connection to the network for their attached terminals via Models 1L, 1R, 2R, 51 R,
or 52R gateway or a 372X ?r 3745 Communication Controller communicating withthe host processor.
The gateway feature does not interfere with the ability of ring-attached devices tocommunicate with each other on the ring; nor does it affect terminals directly
attached to the 3174.
As many as 140 token-ring attached devices can be defined to VTAM in the host.
The addresses are mapped to unique host subchannel or SDLC addresses. One
subchannel or SOLe address is also required for the 3174 Control Unit in which thegateway feature is installed.

3174 Model 53R

ID

E;!:I

Host

I
I
I

DD
3174 Model 1L /with Gateway Feature

FigureI
I

Token-Ring
3174 Model 3RID1

7-4. IBM Token-Ring Network

Chapter 7. Control Units

7-11

Gateway Feature Components
The gateway feature comprises:• A Token-Ring adapter in the 3174
• Utility and Control diskettes (Configuration Support S)• Cable.
Additional storage is needed with this feature. The IBM Token-Ring Network 3270
Gateway feature can be ordered with the 3174 or installed by the customer.

Token-Ring Adapter
The Token-Ring adapter serves as the attachment between the 3174 and the
Token-Ring Network and provides for:• Transfer of data
• Detection of ring and protocol errors.

Microcode
Configuration Support-S Control diskettes are provided with the Token-Ring
Network 3270 Gateway feature. All configuration support for 3174 functions
applicable to the SNA 3174 is included.
The Utility diskette provides the ability to:• Customize the 3174 Subsystem Control Unit
• Assign a ring address for the control unit containing the gateway feature• Map the addresses of workstations or control units attached to the Token-Ring
Network to specific subchannel addresses.
The Control diskette contains the microcode needed to connect and manage a
Token-Ring Network downstream from the control unit.
The screen images used for customizing the gateway feature have the same format
and interface used for customizing the 3174.

3174 Relationship
The Token-Ring Network 3270 Gateway feature does not affect normal 3174
functions for the terminals attached to the control unit terminal and distributed
function terminal (CUT-OFT) interface. No changes are required in the hostapplication program for the gateway feature.

7-12

IBM 3270 Information Display System Introduction

Program Support
The Token-Ring Network 3270 Gateway feature is supported by the following
host-related programs:• NetView• Virtual Telecommunications Access Method (VTAM).
NetView and VTAM run under the following operating systems:• Multiple Virtual Storage (MVS)• Virtual Machine (VM)
• Virtual Storage Extended (VSE).

Problem Determination
The Token-Ring Network 3270 Gateway feature provides ring-related error
processing for the Token-Ring Network, as well as extensions of the following 3174
problem determination functions:
•
•
•
•
•

AlertsOnline tests
Offli ne tests
Error logging
Trace.

In addition, host notification is provided for Token-Ring error-threshold conditions.

Network Asset Management
Network Asset Management supports host requests, through the Systems Network
Architecture (SNA) network, for Vital Product Data information from the SNA 3174
and attached supported devices. The host can dynamically request the collectionof product identification information (such as machine type, serial number, model
number, plant of manufacture, product class [IBM/non-IBM], power on information)from supported network components. This information will be available from thehost upon request.

Multiple Logical Terminals (ML T)
Multiple Logical Terminal support in Configuration Support A or S, Release 3.0 (orhigher), enables IBM 3270 fixed-function displays attached to any model IBM 3174,
regardless of host connection protocol, to interact with up to five host sessions.
The host sessions can be directly connected to a single IBM host and one or more
ASCII hosts. Each session can be connected to only one host at a time.
The MLT feature replaces the previously announced 3174 Multiple Logical Units(MLU) RPQ.

Chapter 7. Control Units

7-13

Country Extended Code Page (CECP)The Country Extended Code Page feature is an extension of the support for each
Latin-based national language code page, to a 191 code point language code pagefor the countries listed below. When used in conjunction with CECP-capable
displays and printers, CECP allows you to use symbols from languages other thanthe one for which the 3174 Subsystem Control Unit is customized. The national.
languages supported by CECP are:
Austrian/German (EBCDIC 76)
New Belgian (International)
Canadian Bilingual
DanishEnglish (UK)English (US)FinnishFrench AZERTY (105)
Italian

Netherlands
NorwegianPortuguese
SpanishSpanish-Speaking
SwedishNew Swiss/French (International)
New Swiss/German (International)

The Country Extended Code Page feature is supported with Configuration Support
A or S, Release 4.0.
The CECP feature replaces the previously announced 3174 Country Extended Code
Page (CECP) RPQ.

Type 1 and Type 2 Communication Adapter for Models 1Land 3R
The Type 1 and Type 2 Teleprocessing Communication Adapters that provide thehost attachment int~rfaces for 3174 Models 1Rand 2R, respectively, are now
available as optional features for the 3174 Models 1L and 3R. With either the Type
1 Communication Adapter or Type 2 Communication Adapter installed, and theappropriately configured microcode loaded, these 3174 models can operate on
teleprocessing facilities as either 3174 Models 1R or 2R.

Attaching Terminals
When attached to a control unit, display stations and printers are referred to as
terminals. The terminals that attach to the 3174 Subsystem Control Unit are listed
in Figure 7-5 on page 7-16.
The attachment flexibility of the new subsystem control units allows more creative
configuration of terminal attachment. The terminals can now be configured toconnect directly to the 3174 Subsystem Control Unit, or through internal/externalterminal multiplexers, or by a combination of these attachments. Combinations
are unique to the 3174 models.
The large-cluster control unit Models 1L, 1R, 2R, and 3R have an integrated
four-port terminal adapter for attaching Category A terminals either directly (fourterminals) or via one to four optional Terminal Multiplexer Adapter features (up to
32 terminals). Category A terminals can also be attached via a combination of
3299 Terminal Multiplexers and optional Terminal Multiplexer Adapter features (upto 32 terminals).

7-14

IBM 3270 Information Display System Introduction

The small-cluster control unit Models 51 R, 52R, and 53R have a similar attachment
flexibility, but with a maximum of 16 terminals. A base unit has an integrated
nine-port terminal adapter for attaching Category A terminals either di rectly (nineterminals), or via two 3299 Terminal Multiplexers (16 terminals), or a combinationof one 3299 (eight terminals) and eight terminals directly attached (for a total of 16
terminals). A multiplexer offers the advantage of connecting eight terminals to one
3174 port; also, less cable is needed when the multiplexer is located close to thecluster of eight terminals. The control units can be grouped conveniently
according to their type of attachment and the size of the cluster of display stations
and printers they can control:• Locally attached model:- 3174 Model 1L can control a large cluster of as many as 32 display stations
and printers.
• Remotely attached models:
3174 Models 1R, 2R, and 3R can control a large cluster of as many as 32
display stations and printers.
3174 Models 51 R, 52R, and 53R control a maximum of 16 display stations
and printers.
3174 Models 81R and 82R control a maximum of eight display stations andprinters.
Your IBM Marketing representative will know of any terminals that are not yet
represented or have been deleted in this book.

Microcode Support
IBM 3174 Configuration Support A and IBM 3174 Configuration Support S provide
support for 3174 features and enhancements.

IBM 3174 Configuration Support A
Configuration Support A, Release 4.0 provides microcode support for the 20MB
fixed disk, Central Site Change Management (CSCM), Network Asset Management,
APL2, Country Extended Code Page (CECP), Multiple Logical Terminals (MLT)
Levels 4 and 5, and ASCII Display Host Addressable Printer (HAP).

IBM 3174 Configuration Support S
Configuration Support S, Release 4.0, provides support for the IBM Token-Ring
Network 3270 Gateway feature, as well as Network Asset Management, 20MB fixed
disk, and Central Site Change Management (CSCM), CECP, APL2, and MLT Levels
4 and 5.

Chapter 7. Control Units

7-15

Figure7-5 (Page 1 of 2). Terminals Supported by 3174 Subsystem Control Units
ChannelAttached

Terminal

1L

Remotely AUached
1R, 2R, 3R
51R,52R,53R

81R,82R

Type ofTerminal

Displays

X

X

X

CUT

Model 1

X

X

X

CUT

Models G1, G2

X

X3180 Model 1

X

X

X

CUT

3191 all models

X

X

X

CUT

Models C, 0, F, L, W

X

X

X

CUT

Model G

X

X

OFT

3193 all models

X

X

OFT

3194 all models

X

X

X

OFT

3278 all models

X

X

X

CUT

3279 all models

X

X

X

CUT

3290 all models

XX

5150, all models

X

X

X

CUT

5160 all models

X

X

X

CUT

5162, Model 286

X

X

X

CUT

5170, all models

X

X

X

CUT

5271, all models

X

X

X

OFT

5273, all models

X

X

X

OFT

5371, all models

X

X

X

OFT

5373, all models

X

X

X

OFT

5540/50/60

X

X

X

OFT

5578

X

X

X

OFT

6150 all models

X

X

X

CUT

6151, all models

X

X

X

CUT

3178 all models
3179

OFT

3192

SOEMI
(OEM Devices)

OFT

X
Printers

3262
Model 3X

X

X

Model 13

X

X

X

Model 2X

X

X

Model2C

X

X

X

3268

7 -16

IBM 3270 Information Display System Introduction

Figure7-5 (Page 2 of 2). Terminals Supported by 3174 Subsystem Control Units
ChannelAttached

Remotely Attached

1L

1R, 2R, 3R
51R, 52R, 53R

81R,82R

Models 1, 1C

X

X

X

Models 2, 2C

X

X

X

3812 Model 2

X

X

X

4214 Model 1

X

X

X

Models 201, 202

X

X

X

Models 2E2, 2C2

X

X

X

X

X

X

Model 012

X

X

X

Model 020

X

X

X4250 Model 1

X

X

X

5210 Models G1, G2

X

X

X

5227 Model 11

X

X

X

6262 Models 012, 014

X

X

X

Terminal

Type ofTerminal

"3287

4224

4234 Model 1
4245

Switching Management System
3814
Model Ai

X

X

X

Model A2

X

X

X

Model A3

X

X

X

Model A4

X

X

X

Legend:• CUT = control unit terminal: A terminal that cannot interpret the data stream and•execute terminal functions without help from the control unit to which it is
attached.
OFT = distributed function terminal: A terminal that can interpret the data stream
and execute functions without help from the control unit to which it is attached.

Chapter 7. Control Units

7-17

Storage
Displays and printers have a diversity of features. The models of the 3174
Subsystem Control Unit differ on the basis of the displays and printers that they
support. All the 3174 models (except Model 52R) have a basic 1MB (MB equals 1
048576 bytes) of storage. Model 52R has 512KB (524288 bytes) of basic storage.
• 3174 Models 1L, 1R, 2R, and 3R have 1MB of storage and one high-capacity
1.2MB diskette drive, designed to support all basic functions; one or two 20MB
fixed disk drives and a second 1.2MB diskette drive are optional.
• 3174 Models 51 Rand 53R have 1MB of storage and one high-capacity 1.2MB
diskette drive, designed to support all basic functions; a 20MB fixed disk drive
or a second 1.2MB diskette drive are optional.
• 3174 Model 52R has 512KB of storage and one high-capacity 1.2MB diskette
drive, designed to support all basic functions; a 20MB fixed disk drive or asecond 1.2MB diskette drive are optional.
The simplicity of the 3174 design makes it easy to use. New technology will allow
the transparent flow of properly programmed instructions, from the systemprocessor to terminals connected to the 3174. The 3174 models support multiple
features, possess functions and features compatible with earlier control unit
models, and are easily configured.

3174 Storage ExpanSion
Several combinations of 3174 features use more storage capacity than the basestorage in the 3174. To allow functional growth and flexibility Models 1L, 1R, 2R
and 3R have two card slots reserved for storage expansion; Models 51 R, 52R and
53R have one card slot reserved for storage expansion. Storage expansion is notavailable on Models 81 Rand 82R. The 3174 Storage Expansion Feature card isavailable in three storage sizes, 512KB, 1.0MB and 2.0MB. The cards, in
combination with 3174 base storage, can provide up to 3.0MB of total storage(except Model 52R which has total storage capacity of 1.5MB).

Local Customization
All 3174 models have a high-capacity 1.2MB diskette drive and are capable ofstoring a greater amount of data than all previous control units. Microcode
diskettes are shipped with each control unit. These diskettes are used to generate
an initial microcode load (lML) disk (either a diskette or a fixed disk) supports theconfiguration of display stations and printers on your system. The IML disk gives
the 3174 all the information about the system that is necessary when power isturned on. To customize a disk, the operator follows a documented procedure fortyping in the system configuration features at the keyboard of a control unit
terminal attached to the control unit. A user-customized disk can be recustomized
as you add or remove features to meet your changing needs. Backup IML
diskettes can be generated with a similar procedure.

7-18

IBM 3270 Information Display System Introduction

Figure7-6 . IBM 3174 Subsystem Control Unit Model1L

3174 Model1L
The 3174 Model 1L (shown in Figure 7-6) is a large-cluster control unit. It is
shipped with an S/370-type channel adapter for SNA and non-SNA for local
attachment. The basic storage is 1MB . One 5-1/4-inch, high-capacity, 1.2MB
diskette drive is standard for all models . A second diskette drive or a fixed disk
drive must be installed if distributed function terminals are to be used fordownstream load (DSL) . A four-port terminal adapter that attaches IBM 3299
Terminal Multiplexers and Terminal Multiplexer Adapters (a special feature)
supports a maximum of 32 Category A terminals.
Customization is performed with a Control Unit Terminal (CUT) attached to port 0 of
the 3174. All 3174 control units support full keyboard utilities.
Subsystem online tests and problem determination are performed through acontrol unit terminal attached to any port or multiplexer without interrupting otherterminals attached to the 3174. Offline tests are performed through the 3174
control panel or through a control unit terminal attached to port 0 only.

Chapter 7. Control Units

7-19

Customer-installable special features are:
•
•
•
•
•

1.2MB Diskette Drive
Terminal Multiplexer Adapter
Token-Ring Adapter
Asynchronous Emulation Adapter
20MB Fixed Disk

•
•
•
•

Token-Ring 3270 Gateway
Storage Expansion
Type 1 Communication Adapter
Type 2 Communication Adapter.

3174 Model 1 R
The 3174 Model1R is a large-cluster control unit designed for remote operations.
It contains a Type 1 Communication Adapter that provides EIA 232D/CCITT V.24
and CCITT V.3S interfaces for SNA/SDLC, BSC, or X.2S remote link attachment.
The basic storage is 1MB. One 5-1/4-inch, high-capacity, 1.2MB diskette drive isstandard for all models. A second diskette drive or a fixed disk drive must be
installed if distributed function terminals are to be used for downstream load (DSL)or to support optional Asynchronous Emulation Adapters. A four-port terminal
adapter that attaches IBM 3299 Terminal Multiplexers and Terminal Multiplexer
Adapters (a special feature) supports a maximum of 32 Category A terminals.
Customization is performed with a Control Unit Terminal (CUT) attached to port 0 of
the 3174. All 3174 control units support full keyboard utilities.
Subsystem online tests and problem determination are performed through acontrol unit terminal attached to any port or multiplexer without interrupting otherterminals attached to the 3174. Offline tests are performed through the 3174
control panel or through a control unit terminal attached to port 0 on!y.
A Model 1R can be converted to a Model 3R, by the customer, for attachment to
the IBM Token-Ring Network.
Customer-installable special features are:
•
•
•
•
•
•
•

7-20

1.2MB Diskette Drive
Terminal Multiplexer Adapter
Encrypt/Decrypt
Asynchronous Emulation Adapter
Storage Expansion
20MB Fixed Disk
Token-Ring 3270 Gateway.

IBM 3270 Information Display System Introduction

3174 Model 2R
The 3174 Model 2R is a large-cluster control unit designed for remote operations.
It contains an X.21 interface (CCITT V.11) for SNA/SDLC or X.25 remote link
attachment. The basic storage is 1MB. One 5-1/4-inch, high-capacity, 1.2MB
diskette drive is standard for all models. A second diskette drive or a fixed disk
drive must be installed if distributed function terminals are to be used fordownstream load (DSL). A four-port terminal adapter that attaches IBM 3299
Terminal Multiplexers and Terminal Multiplexer Adapters (a special feature)
supports a maximum of 32 Category A terminals.
Customization is performed with a Control Unit Terminal (CUT) attached to port 0 of
the 3174. All 3174 control units support full keyboard utilities.
Subsystem online tests and problem determination are performed through acontrol unit terminal attached to any port or multiplexer without interrupting otherterminals attached to the 3174. Offline tests are performed through the 3174
control panel or through a control unit terminal attached to port 0 only.
A Model 2R can be converted to a Model 3R, by the customer, for attachment to the
IBM Token Ring Network.
Customer-installable special features are:
•
•
•
•
•
•
•

1.2MB Diskette Drive
Terminal Multiplexer Adapter
Encrypt/Decrypt
Asynchronous Emulation Adapter
Storage Expansion
20MB Fixed Disk
Token-Ring 3270 Gateway.

Chapter 7. Control Units

7 -21

3174 Model 3R
The 3174 Model 3R is designed to connect to an IBM Token-Ring Network. Whenconnected to a Model 3R, the terminals can be located almost anywhere within an
establishment and stil/ operate at near channel response time.
The basic storage is 1MB. One 5-1/4-inch, high-capacity, 1.2MB diskette drive isstandard for all models. A second diskette drive or a fixed disk drive must be
installed if distributed function terminals are to be used for downstream load (DSL).
A four-po,rt terminal adapter that attaches IBM 3299 Terminal Multiplexers andTerminal Multiplexer Adapters (a special feature) supports a maximum of 32
Category A terminals.
Customization is performed with a Control Unit Terminal (CUT) attached to port 0 of
the 3174. All 3174 control units support full keyboard utilities.
Subsystem online tests and problem determination are performed through acontrol unit terminal attached to any port or multiplexer without interrupting otherterminals attached to the 3174. Offline tests are performed through the 3174
control panel or through a control unit terminal attached to port 0 only.
The Model 3R can be converted, by the customer, to a Model 1R or 2R.
Customer-instal/able special features are:
•
•
•
•
•
•
•
•

7-22

1.2MB Diskette Drive
Terminal Multiplexer Adapter
Encrypt/Decrypt
Asynchronous Emulation Adapter
Storage Expansion
20MB Fixed Disk
Type 1 Communication Adapter
Type 2 Communication Adapter.

IBM 3270 Information Display System Introduction

Figure7-7 . IBM 3174 Subsystem Control Unit Model 51R

3174 Model51R
The 3174 Model 51R (shown in Figure 7-7) is a small-cluster control unit designed
for remote operations . It contains EIA 232D/CCITT V.24 and CCITT V.35 interfaces
for SNA/SDLC, BSC, or X.25 remote link attachment. Basic storage is 1MB . One
5-1/4-inch, high-capacity, 1.2MB diskette drive is basic for all models. A second
diskette drive or a fixed disk drive must be installed if distributed function
terminals are to be used for downstream load (DSL) . A nine-port terminal adapter
supports nine Category A terminals directly or 16 Category A terminals throughone or two IBM 3299 Terminal Multiplexers.
Customization is performed with a Control Unit Terminal (CUT) attached to port 0 of
the 3174. All 3174 control units support full keyboard utilities .
Subsystem online tests and problem determination are performed through acontrol unit terminal attached to any port or multiplexer without interrupting otherterminals attached to the 3174 . Offline tests are performed through the 3174
control panel or through a control unit terminal attached to port 0 only.
Customer-installable features are :
•
•
•
•
•

1.2MB Diskette Drive
Storage Expansion
20MB Fixed Disk
Token-Ring 3270 Gateway
Asynchronous Emulation Adapter.

Chapter 7. Control Units

7-23

3174 Model 52R
The 3174 Model 52R is a small-cluster control unit designed for remote operations.
It contai ns X.21 interface (CCITT V .11) for SNA/SDLC or X.25 remote Ii nk
attachment. The basic storage is 512KB. One 5-1/4-inch high-capacity 1.2MB
diskette drive is standard for all models. A second diskette drive is required if
distributed function terminals are to be used for downstream load (DSL). A
nine-port terminal adapter supports nine Category A terminals directly or 16
Category A terminals through one or two IBM 3299 Terminal Multiplexers.
Customization is performed with a Control Unit Terminal (CUT) attached to port 0 of
the 3174. All 3174 control units support full keyboard utilities.
Subsystem online tests and problem determination are performed through acontrol unit terminal attached to any port or multiplexer without interrupting otherterminals attached to the 3174. Offline tests are performed through the 3174
control panel or through a control unit terminal attached to port 0 only.
Customer-installable features are:
•
•
•
•
•

1.2MB Diskette Drive
Storage Expansion
20MB Fixed Disk
Token-Ring 3270 Gateway
Asynchronous Emulation Adapter.

3174 Model 53R
The 3174 Model 53R connects to the IBM Token-Ring Network. When connected toa Model 53R, terminals can be located almost anywhere within an establishment
and still operate at near channel response time.
The basic storage is 1MB. One 5-1/4-inch, high-capacity, 1.2MB diskette drive isstandard for all models. A second diskette drive is required if distributed function
terminals are to be used for downstream load (DSL). A nine-port terminal adapter
supports nine Category A terminals directly or 16 Category A terminals throughone or two IBM 3299 Terminal Multiplexers.
Customization is performed with a Control Unit Terminal (CUT) attached to port 0 of
the 3174. All 3174 control units support full keyboard utilities.
Subsystem online tests and problem determination are performed through acontrol unit terminal attached to any port or multiplexer without interrupting otherterminals attached to the 3174. Offline tests are performed through the 3174
control panel or through a control unit terminal attached to port 0 only.
Customer-installable features are:
•
•
•

7-24

1.2MB Diskette Drive
Storage Expansion
20MB Fixed Disk.

IBM 3270 Information Display System Introduction

Figure7-8. IBM 3174 Subsystem Controi Unit Model 81R

3174 Model81R
The 3174 Model 81R (shown in Figure 7-8) is a very-small-cluster control unit
designed for remote operations. It contains EIA 232D/CCID V.24 and CCID V.35
interfaces for SNA/SDLC, BSC , or X.25 remote link attachment. Basic storage is
1MB. One 5-1/4-inch, high-capacity, 1.2MB diskette drive is basic for all models. A
four-port terminal adapter supports four Category A terminals directly or eight
Category A terminals through an IBM 3299 Terminal Multiplexer.
Customization is performed with a Control Unit Terminal (CUT) attached to port 0 of
the 3174. All 3174 control units support full keyboard utilities.
Subsystem online tests and problem determination are performed through acontrol unit terminal attached to any port or multiplexer without interrupting otherterminals attached to the 3174. Offline tests are performed through the 3174
control panel or through a control unit terminal attached to port 0 only.

3174 Model 82R
The 3174 Model 82R is a small-cluster control unit designed for remote operations.
It contains an X.21 interface (CCITT V.11) for SNA/SDLC or X.25 remote link
attachment. The basic storage is 1MB. One 5-1/4-inch , high-capacity, 1.2MB
diskette drive is standard for all models. A four-port terminal adapter supports
four Category A terminals directly or eight Category A term inals through IBM 3299
Terminal Multiplexers .
Customization is performed with a Control Unit Terminal (CUT) attached to port 0 of
the 3174. All 3174 control units support full keyboard utilities.
Subsystem online tests and problem determination are pe rf ormed through acontrol unit terminal attached to any port or multiplexer without interrupting otherterminals attached to the 3174 . Offline tests are performed through the 3174
control panel or through a control unit terminal attached to port 0 only .

Chapter 7. Control Units

7-25

7-26

IBM 3270 Information Display System Introduction

Chapter 8. Optional System Components

Figure8-1. IBM 3299 Terminal Multiplexer

3299 Terminal Multiplexer Models 2 and 3
An intermediary between the IBM 3174 or 3274 control unit and the terminals inlarge or dispersed computer installations, the IBM 3299 Terminal Multiplexer(shown in Figure 8-1) allows the terminals to be located at a greater distance fromthe control unit. In addition, the 3299 eliminates the expense and planning
involved in running individual coaxial cables from the control unit to each of theterminals attached to it.
•

Only one cable is required to connect a control unit and a 3299, which can belocated as far as 1500 meters (4920 feet) from the control unit. Since each 3299
can attach a maximum of eight terminals, four 3299s are required to attach 32
terminals to a control unit.

• Terminals can be attached to the 3299 by cable from a distance as far as 1500
meters (4920 feet) away. This means that the terminals can be 3000 meters(9840 feet) from a control unit, which is twice the distance allowed for directlycabled terminals.
• The 3299 can attach to all the control units except the 3274 Model 51C.
• The 3299 Model 2 is a replacement for the Model 1 in installations using
coaxial cable. In addition, the Model 2 attaches directly to the IBM Cabling
System, eliminating the need for baluns at the 3299 ends of the cables.

Chapter 8. Optional System Components

8-1• The 3299 Models 2 and 3 are attached to a control unit using the IBM Cabling
System without requiring a balun at the 3299 end of the cable. Baluns are notrequired at the 3174 end of the cable.
Specified twisted-pair wire is used to attach the terminals to the Model 3. The
terminals will usually require a coax-to-twisted-pair adapter for attachment totwisted-pair wire. This adapter is not required at the Model 3 end of the wire.

8-2

IBM 3270 Information Display System Introduction

Figure8-2 . IBM 3814 Switch ing Management System

3814 Switching Management System
The IBM 3814 Switching Management System (shown in Figure 8-2) is a device
that switches processor channels among 1/0 control units in a data processing
center. The modular design of the 3814 allows individual 3814 units to be
distributed through a large processing center to put switching capability where it isneeded . The 3814 lets you switch resource pools among processors, back up
failing processors and devices, and balance the workload among processors,
making it easier for you to manage the resources in your data center. Using the3814, you can:•Rapidly reconfigure your resources among the channels of one or more IBM
System/370, 30xx, or 43xx processors••

Provide alternative paths to critical devices
Increase the number of possible control unit configurations on each channel.

Following are some of t he characteristics of the 3814:
•
•
•
•
•
•
•
•
•

Allows remote control of switching (you can locate the switching console up to
305 meters (1000 feet) away from the 3814) .
Uses operator control on a 3178 or 3278 display terminal or a 3270 PC, or, if thesystem attachment feature is installed , on a host-attached terminal
Uses prestored configurations for rapid , error-free reconfigurations
Switches synchronously with a lull in channel traffic, or immediately
Has an online help facility (USERINFO) that can be tailored by the customer
Generates a log record file
Prints to a 3287 printerAllows password security
Has self-diagnostics .

Chapter 8. Optional System Components

8-3

1I111111I111111111111111I111111111111111111I1111111111"•
Figure8-3 . IBM 5209 Link Protocol Converter

5209 Link Protocol Converter
The IBM 5209 Link Protocol Converter (shown in Figure 8-3) enables many 3270
display stations and printers to communicate with a 5250 host or control unit inaddition to a 3174 or 3274 control unit.
The 5209 attaches to the 3274 or 3174 control unit by the 3299 Terminal Multiplexer.
This permits the 5209 to be located up to 1500 meters (5000 feet) from the 3x74
control unit and 1500 meters (5000 feet) from the 5250 host or control unit. The
terminals and printers can be located another 1500 meters (5000 feet) from the
5209.

8-4

IBM 3270 Information Display System Introduction

The 5209 can connect up to seven terminals and printer~. The terminals can switch
between host sessions on the S/36 or 38 and the 370 host by use of a hot-key
sequence. Printers can be assigned to either host via configuration.
The 5209 provides the customer a means of utilizing S/3x systems as a department
computer while maintaining host applications on the 370. This eliminates dual
terminals and printers and reduces the cabling impact.
The following display stations and printers are supported:
3178 Display Station Models C1, C2, and C33179 Color Display Station Model 1
3180 Display Station Model 1
3191 Display Station
3192 Display Station
3194 Display Station (CUT mode)
3278 Display Station Models 2, 3, 4, and 53279 Color Display Station Models S2A, 2A, 3A, 2X, 3X, S2B, S3G, 28, and 3B
3270 Personal Computer (CUT mode)
IBM Personal Computer with 3278/79 Emulation Adapter
3262 Line Printer Models 3 and 13
3268 Pri nter Models 2 and 2C
3287 Pri nter Models 1, 1C, 2, and 2C
3812 Pageprinter4214 Printer Model 1
4224 Pri nter4234 Printer Model 1
4245 Pri nte r
5210 Printer Models G01 and G02.
6262 Line Printer.

Chapter 8. Optional System Components

8-5

8-6

IBM 3270 Information Display System Introduction

Chapter 9. Functional Control Capability
To use the functional control capability of the IBM 3270 Information Display Systemeffectively, the system designer must consider the display image formats,transaction design, communication facilities, operator wait times, operator costs,
channel loading, number of processor interruptions, number of telecommunication
messages, and application program design. This is best done by selecting atypical transaction and evaluating the effect of functional control capability on
system costs and performance. This evaluation, coupled with an assessment ofoperator control capabilities and considerations of system configuration, physicalsetup, and installation planning, will determine the best ratio between cost andperformance for a display system.
Highlights of the functional control capabilities of the 3270 Information Display
System include:
Format Control by Data Field: The 3270 system provides program control by data
field. Each data field is established by a field-attribute character in the first
position of the field. The field attribute character, written by the program, occupies
a single nondisplayed character position at the beginning of a field and serves as avisual separation between successive fields. A field may be started at any
character position on the display screen. The attribute character can define:• Protected or nonprotected fields: A protected field is one that cannot be
modified by the display operator. An unprotected field is one in which theoperator can enter or modify data.
• Alphanumeric or numeric fields: An alphanumeric field is an input field inwhich an operator can enter alphabetic, numeric, or symbol characters. A
numeric field has special meaning for protected fields, data entry keyboards,
and the Numeric Lock special feature.
• Character display (nondisplay, display, intensified display).
• Detectability or nondetectability (by use of a selector pen).
• Tab stop positions (the first character position of unprotected fields).
Note: A secondary effect of the protection and intensity attributes is the control offield color on the 3270 color display stations and printers when in base color mode.
Fields can be displayed and printed in any of the four colors red, blue, green, andwhite.

Chapter 9. Functional Control Capability

9-1Format Control by Data Field and Character: Extended attribute codes control
these additional characteristics:• Extended highlighting (reverse video, blinking, and underscore)• Extended color (seven colors)• Programmed symbols.
These attributes can be associated with fields or individual characters.
Alert: The Alert function makes it easier for the system operator to do problem
determination and failure isolation. The 3174 and 3274 control units send
unsolicited error messages to the host through the Network Communication
Control Facility (NCCF) and Network Problem Determination Application (NPDA)
licensed programs. The messages appear on the system operator's screen. Alertcapability can be set up to show all the errors in the network by type, or only errors
in a certain device.
When the ISM Token-Ring 3270 Gateway feature is installed in a 3174 Model 1L,
alerts are sent to the NCCF that reflect the status of the Token-Ring network
attached to the control unit. Alert is an SNA-only function, supported by microcode
in the 3174 and 3274.
Audible Alarm (display stations): An application program can activate the alarm.
The User's Guide for a program tells whether the audible alarm sounds and, if so,
the different reasons for sounding it.
Audible Alarm (printers): This audible alarm is activated by a code in the hostprogram or by an error condition that occurs during printer operation. This audible
alarm alerts the operator to conditions requi ring operator intervention.

esc Copy Command (3174 Models 1R and 51R; 3274 Models 21C, 31G, 41G, 51C,
and 61C): The host-initiated SSC Copy command may be used with these control
units to direct data transfer from one terminal to another terminal attached to thesame control unit. Upon accepting the command issued at the receiver (to)terminal, the control unit controls the data transfer from the sender (from) terminal.
This eliminates the need to transfer the buffer data to and from the host.

esc and SDLC Protocol: SSG protocol provides transmission reliability andcomprehensive data checking. SDLC protocol, compared with SSG protocol,
provides more extensive data-checking capability, results in greater transmission
efficiency, and uses common-carrier facilities. '3174 Channel Interface Speeds: Data transfer rates to 1.25 million characters per
second allow operation at the speed of the channel, which reduces response time.
3274 Channel Interface Speeds: Data transfer rates of 10 000 to 650 000 characters
per second allow operation at the speed of the channel, which reduces response
time.

9-2

IBM 3270 Information Display System Introduction

Character Addressing: Addressing facilities permit starting a program write at any
character position of the display screen. The write address can be set any numberof times during an image write or update, or both. This allows selective writes tovarious noncontiguous areas of the display screen. This facility also allows themodification of single- or multiple-field attribute characters as well as datacharacters.
Communication Line Speeds: Depending on the unit and its features, transmission
rates of up to 64 000 bps are possible.
Erase Unprotected: The Erase Unprotected operation capability erases all
unprotected data fields to null codes, and it positions the cursor in the fi rst
unprotected field of the screen.
Host-Initiated Local Copy Function (SNA only: 3174; 3274; 3276 Models 11, 12, 13,
and 14; and 3276 Models 1, 2, 3, and 4 with the SOLe/SSe Switch Feature): The
host can initiate a local copy function by sending a write-type command with theprint bit set. This function permits data transfer from a 3270 display station to any
printer(s) attached to the same control unit. Printer assignment is controlled by aprint authorization matrix in the control unit. This matrix specifies, for example,
which displays may use a given printer. The matrix is loaded in the 3174 and 3274
from the host by the user-written application program or from the customized
system diskette. Category A display stations can transfer data only to Category A
printers. In the 3276, the matrix is determined by the physical attachment of theprinters to the 3276 at power-on time. In this matrix, each display station isassociated with the powered-on printer that has the next higher terminal address.
Printer assignment can be changed at the attached display station keyboard.
Null Suppression: To reduce message lengths while providing maximum length
input fields, 3270 data fields can be erased to null codes under operator orprogram control. As an operator keys input data into a field, data codes replacenull codes, leaving null codes in any unkeyed positions of the field. When a read
modified message is sent to the host system, null codes are not transmitted as partof the message. This eliminates the transmission of unnecessary codes fromunused positions of a field.
Operator-Initiated Local Copy Function (Non-SNA and SNA: The operator initiates
a local copy from a 3270 display station to a printer(s) attached to the same control
unit by pressing the Print key on the display station keyboard. As with thehost-initiated local copy function (described above), printer selection is controlled
by a print authorization matrix in the 3174,3274, or 3276.
Program Tab: To decrease the length of a message transmitted to a display
station, Program Tab permits writing data fields into successive unprotected data
fields that were previously defined by a screen format. This eliminates the need totransmit control characters to specify the starting address of noncontiguous data,and so reduces the number of control characters required.

Chapter 9. Functional Control Capability

9-3

Protected Data Image Format: Protected data image format prevents the operator
from entering data on specific areas of the screen. This allows field labels,
instructions, and field control information to be written to a display station onceand reused any number of times with variable input or output data. For example,
in file inquiry, a protected data image format can be written to the display station
once, allowing later transmission of only the variable data records. Similarly, a
protected data image format can be written to a display station once and can beused many times for repetitive key entry input transactions.
Read Modified Command: This command permits transfer of only
operator-modified data fields with null codes suppressed. Because this operation
reduces the message size by including essential data only, it also reduces traffic
on the communication line and channel.
Remote General Poll: The control unit hardware has provisions to allow the
program, with a general poll instruction, to interrogate all devices attached to thecontrol unit with only one request. This reduces polling overhead andcommunication line traffic.
Repeat Characters: To decrease the number of data characters that must betransmitted to a display station, a single character, transmitted once, can be
repeated from a starting address to an ending address.
Select: Display systems directly attached to a channel require a buffer load delay
to prepare to execute a write or a read operation. A select operation allows aselector or block multiplexer channel to be released for other use during this delay
time.
Short Read: Program access (PA) keys permit an operator to communicate withthe program without transmitting unprotected data fields to the host system.
Pressing one of these keys causes a short read operation that will transmit only the
information necessary to identify which of the keys caused the attention. Thiseliminates the transmission of unnecessary data to the host system processor,
thereby reducing traffic on the communication line and channel.
Write and Erase/Write Alternate Commands: These commands are used to load,
format, and selectively erase device buffer data.
Write Structured Field Command: This command provides a general mechanism
for conveying command-like functions, called structured fields, in the data stream
to a terminal. These structured fields can be used by a program to perform various
functions. For example, the program may interrogate a device to establish its
characteristics, such as whether it supports color, or it may instruct the device on
whether the attributes of color and highlighting should be included in data sentfrom the terminal to the host computer. It also establishes whether the operator
can select these attributes from the display station keyboard.

9-4

IBM 3270 Information Display System Introduction

Chapter 10. System Attachment
This chapter introduces the ways that 3270 control units can be attached to a hostsystem.

Local Attachment
Locally, a control unit is attached to a System/370 type processor through aselector, multiplexer, or block multiplexer channel. The control unit is attached bycable to one of the eight control unit positions on the channel interface. From thehost computer, the channel provides the control unit with both the data for display
and printing, and the control information it needs to direct the operation of its
attached display stations and printers. In their buffer storage, the display stations
and printers store the data from the control unit for display or printing. The buffer
permits simultaneous presentation of the display image and composition of amessage from the keyboard at each display station.
Locally attached control units can be positioned as far as 61 meters (200 feet) fromthe system channel, depending upon the system and channel configuration.
Locally attached control units are:• 3174 Subsystem Control Unit Model 1L• 3274 Control Unit Models 21A, 21B, 210, 31A, 310, 41A, and 410.
The 3174 Model 1L also attaches to the IBM 3044 Fiber Optic Channel Extender
Link, permitting the control unit to be placed up to 2 kilometers (6600 feet) from thechannel.

Remote Attachment
Remotely, the control unit and the system channel can communicate(1) through a channel-connected commu~ication controller or an integrated control
unit using BSC protocol, or (2) through a communication controller using BSe or
SOLC protocol. The control unit communicates with intermediary devices bymeans of communication facilities (data links):• Modems• Voice-grade channels• Equivalent facilities: telephone lines, microwaves, or satellites.
These control units can be remotely attached using BSC protocol:• 3174 Models 1R, 51 R, and 81 R
• 3274 Models 21C, 31C, 41C, 51C, and 61C• 3276 Models 1, 2, 3, and 4.

Chapter 10. System Attachment

10-1

These control units can be remotely attached using SOLC protocol:••••

3174 Models 1R, 2R, 51R, 52R, 81R, and 82R
3274 Models 21C, 31C, 41C, 51C, and 61C
3276 Models 11,12,13, and 14
3276 Models 1, 2, 3, and 4 if equipped with the SOLC/BSC Switch feature.

These control units can be remotely attached using X.25 protocol:• 3174 Models 1R, 2R, 51 R, 52R, 81 R, and 82R• 3274 Models 21C, 31C, 41C, 51C, and 61C.
The following system processors support 3274 and 3276 control units:• System/370• 4300• 8100 (remote SOLC)• 303x• 308x• 309x• Series/1• S/38 (remote SOLC)• S/88 (remote BSC).

The following system processors support 3174 subsystem control units:
•
•
•
•
•

4361
4381
308x
309x
8100 (remote SOLC)

•
•
•
•

S/3X (remote SOLC)
Series/1
Series Remote SOLC or BSC
9370 Remote SOLC or BSC.

Token-Ring Network Attachment
The control units attached to an IBM Token-Ring Network can communicate withthe system channel by means of a gateway feature that attaches the Token-Ring
Network to the channel. For the following control units, this gateway may be an
IBM Token-Ring Network 3270 Gateway feature installed in a 3174 Model 1L, 1R,
2R, 51 R, 52R, or a 3720 or 37X5 Communications Controller with the
NCP/Token-Ring Interface (NTRI) facility.
Terminals attach to the IBM Token-Ring Network through:• 3174 Models 3R and 53R.

10-2

IBM 3270 Information Display System Introduction

Loop Attachment Using SOLC Protocol
A loop attachment increases the number of terminals and control units that can be
attached to a host system. A 3270 display system can be loop-attached to the:• 8100 System• 4300 System.
through the following control units:• 3274 Models 51C and 61C• 3276 Models 11,12,13, and 14.
Directly attached loops operate at speeds up to 9600 bits per second (bps);
data-link-attached loops operate at 1200 or 2400 bps.

Communication Networks and Modems
Remotely attached 3270 display systems that use SSC or SOLC protocol operate indata half-duplex transmission mode on half-duplex or duplex communication
facilities.
When using SSG protocol, the following control units can attach to a multipoint
nonswitched network:• 3174 Models 1R, 51R, and 81R• 3274 Models 21G, 31G, 41C, 51C, and 61C• 3276 Models 1, 2, 3, and 4.
When using SOLG protocol, the following control units can attach to a multipoint
nonswitched Ii ne network:••••

3174 Models 1R, 2R, 51R, 52R, 81R, and 82R
3274 Models 21C, 31C, 41C, 51G, and 61G
3276 Models 11, 12, 13, and 14
3276 Models 1,2, 3, and 4 with the SOLC/SSG Switch feature installed.

The following can also attach to switched lines:••••

3174 Models 1R, 2R, 51 R, 52R, 81 R, and 82R
3274 Models 51G and 61C
3276 Models 11, 12, 13, and 14
3276 Models 1,2, 3, and 4 with the SOLC/SSG Switch feature installed.

When two or more SOLG devices are multidropped and attached to acommunication controller, messages can be simultaneously transmitted andreceived by the communication controller on duplex facilities (multi-multipoint
operation). The communication controller can operate in data duplex mode; the3270 units, however, operate only in data half-duplex mode.

Chapter 10. System Attachment

10-3Some of the external IBM modems that can be used in remote systems are:Nonswitched Network Modems• 3833• 3834• 3863 Model 1• 3864 Model 1• 3865• 3868 Model 1• 3868 Model 2• 3868 Model 3• 3868 Model 4• 5811• 5865• 5866• 5868• 5868• 5979 Model L41

2400 bps
4800 bps
2400 bps
4800 bps
9600 bps
2400 bps
4800 bps
9600 bps
9600 bps
2400, 4800, 9600, 19 200 bps (baseband)
9600 bps
14400 bps
9600 bps
14400 bps
2400, 4800, 9600, 19 200 bps (baseband)

Switched Network Modems• 3863 Model 2• 3864 Model 2

2400 bps
4800 bps

Note: 14 400 bps - not with 3276; 19 200 bps - not with 3274, 3276.

Some of the external IBM modems that support Switched Network Backup (SNBU)
operation are:
•
•
•
•

3863
3864
3865
3872 (except 3174)• 3875 (except 3174)• 5865• 5866 (except 3276).

For 3174 or 3274 SNBU operation, a backup Control diskette containing SNBU
support may be needed.
Switched-network backup operation is initiated by the terminal operator. When, forexample, a problem is experienced with a nonswitched line, the terminal operator
can invoke SNBU by calling the host system via the public switched telephone
network to reestablish a connection and resume operation.
A Digital Data Service (DDS) adapter installed in the 3274 Models 21C, 31C, 41C,
51C, and 61C or in the 3276, an interface with American Telephone and Telegraph's
nonswitched Data-Phone 1 digital data service network.

1

Trademark of American Telephone and Telegraph Company.

10-4

IBM 3270 Information Display System Introduction

_ In the 3274, the DOS adapter can operate in SSC or SOLC data transmission at
speeds of 2400, 4800, and 9600 bps and, in SOLC, at 56 000 bps. In all models of
the 3276, the DDS adapter can operate at speeds of 2400 and 4800 bps; and in
Models 11,12,13, and 14, the DDS adapter can also operate at a speed of 9600bps.
A CCITT V.35 Interface feature for attachment to an external modem or other data
circuit-terminating equipment (OCE) provides for speeds up to 56 000 bps for SOLC
or 9600 bps for SSC on the 3274 Models 21C, 31C, 41C, 51C, and 61C.
The X.21 interface features permit SOLC operation at speeds of 2400, 4800, 9600, or
48 000 bps through X.21 switched and nonswitched data communication equipment.
The X.25 adapter feature enables remote models to attach to host systems via an
X.25 network, using SNA-defined protocols.

Chapter 10. System Attachment

10-5

10-6

IBM 3270 Information Display System Introduction

Chapter 11. Programming Support
Following is a list of some of the operating systems, access methods, and licensed
programs that support the IBM 3270 Information Display System. For details about
them, contact your IBM marketing representative.

Operating Systems
•
•
•
•
•
•
•
•

Airlines Control Program (ACP)
Disk Operating System/Virtual Storage Extended (DOS/VSE)
Multiple Virtual Storage/Extended Architecture (MVS/XA)
Multiple Virtual Storage/System Product (MVS/SP)Operating System/Virtual Storage 1 (OS/VS1)
Small System Executive (SSX)
Small System Executive/Virtual Storage Extended (VSE/SSE)
Virtual Machine/System Product (VM/SP)

Telecommunication Access Methods
•

•
•
•

Advanced Communications Function/Virtual Telecommunications Access
Method (ACF/VTAM) under DOS/VS, DOS/VSE, and OS/VS
Advanced Communications Function/Telecommunications Access Method(ACF/TCAM) under OS/VS
Advanced Communications Function/Virtual Telecommunications Access
Method Entry (ACF/VTAME) under DOS/VSE
Basic Telecommunications Access Method (BTAM) under OS, DOS, OS/VS,
and DOS/VS
Basic Telecommunications Access Method - Extended Support (BTAM-ES)
under DOS/VSE
Extended Telecommunications Modules (EXTM) feature of CICS/DOS/VS
Telecommunications Access Method (TCAM) under OS and OS/VS
Virtual Telecommunications Access Method (VTAM) under DOS/VS and OS/VS••

Advanced Communications Function/Network Control Program (ACF/NCP)
Emulation Program (EP)

•
•
•
•

Network Control• NetView• Network Performance Analyzer (NPA)• Network Performing Analysis Reporting System (NETPARS)• Virtual Machine/VTAM Communications. Network Application (VM/VCNA)• VM/Pass-Through Facility• Network Design and Analysis (NETDA)• Netview Distribution Manager (NETVIEW OM)

Chapter 11. Programming Support

11-1

Cross-Industry Licensed Programs
•
•
•
•
•
•
•

Financial Management System
Instructional Systems (liAS/liPS)
Interactive Financial System (IFS)Interactive Personnel System (INTERPERS)
Planning, Control, and Decision Evaluation System (PLANCODE)
Report Management and Distribution System (RMDS)
Trend Analysis

Information Center
•
•
•
•
•
•

A Departmental Reporting System II (ADRS II)APL Data Interface (APLlDI)
APL Financial Planning System (APLlFPS)
GRAPHPACK Full Screen Interface
Query-by-Example (QBE)VS APL (A Programming Language)

Development Center
•
•
•
•
•

Development Management System/CICS/VS (DMS/CICS/VS)
Development Management System/Cross System Product (DMS/CSP)
Entry Level Interactive Application System (ELIAS)IMS Application Development Facility II (IMSADF II)
Screen Definition Facility/Customer Information Control System (SDF/CICS)

•
•
•
•
•
•

Advanced Text Management System III (ATMS III)
Document Composition Facility (DCF)
Host Display View Facility (HDVF)
Integrated Processing of Data and Text (IPDT)
Professional Office System (PROFS)
Storage Information Retrieval System (STAIRS)

Office Systems

11-2

IBM 3270 Information Display System Introduction

Data Base Data Communication Systems•

CICS/DC Aids
- CICS/VS Online Test/Debug II (OlTD II)- CICS Source Program Maintenance Online II (SPM II)• Customer Information Control System/VS (CICS/VS)• DB/DC Data Dictionary• IMS/VS Aids
- Batch Terminal Simulator• Information Management System/VS Data Communications (IMS/VS-DC)

Interactive Programming Support
•
•
•
•
•

Conversation Monitor System (CMS)Interactive System Productivity Facility (ISPF)
Time Sharing Option (TSO)TSO Extensions (TSO/E)
Virtual Storage Extendedllnteractive Computing and Control Facility(VSEIICCF)• Virtual Storage Personal Computing (VSPC)

Other Licensed Programs
•
•

•
•
•
•
•
•
•
•
•
•

Communication Oriented Production Information Control System (COPICS)
Display console support for local 3270 displays and printers used as operator's
consoles through Device-Independent Display Operator Console Support(DIDOCS) and Status Display Support OS and OS/VS
Distributed Processing Control Executive (DPCX)
Distributed Processing Programming Executive (DPPX)
Downstream load Utility (DSlU)
Editor (XEDIT)
Graphical Data Display Manager (GDDM)
3270-PC Graphics Applications System
Time Sharing Option (TSO) of TCAM and VTAM
3-Dimensional Presentation Graphics Facility (3D-PGF)
3270 Personal Computer File Transfer Program
IBM PC/HOST File Transfer and Terminal Emulator Program (FTTERM)

Chapter 11. Programming Support

11-3

11-4

IBM 3270 Information Display System Introduction

Chapter 12. Installation Planning and Customer Setup
The design and physical characteristics of the 3270 Information Display System
make the components an attractive addition to an office or to a computer room.
For information on work-space considerations, site preparation, cables andconnectors, and machine specifications, refer to 3270 Information Display System
Library User's Guide, GA23-0058. When planning your installation, be sure toconsider using the 3299 Terminal Multiplexer to decrease significantly the amountof cable required.
Certain units in the 3270 display system are designated for customer setup. These
units can be set up as soon as they arrive, reducing the time spent waiting for theunits to become operational. Because they are customer setup units, thecomponents can be easily relocated.
The setup process consists of two steps: physical setup and checkout. The setup
instructions are shipped with the units. Once the units are unpacked and placed inposition, customer personnel capable of operating the units should be able to set
them up and check them out.
For further information about customer setup, see your IBM marketing
representative.

Chapter 12. Installation Planning and Customer Setup

12-1

12-2

IBM 3270 Information Display System Introduction

Chapter 13. Problem Determination
To ensure that more computer time is available to the customer, the problem
determination procedures and recovery routines for the 3270 units are designed tobe easy to use.
Problem determination procedures are provided for the 3174,3274, and 3276
control units, 3270 display stations and printers, and the 3299 Terminal
Multiplexers. Customer Problem Analysis and Recovery procedures for theoperator are provided with each display station and 3299 Terminal Multiplexer.
Each 3278 and 3279 keyboard includes a problem determination guide. For the IBM
3270 Personal Computer Attachment, diagnostic aids are available on a diskette.
The IBM 3270 Personal Computer Control Program User's Guide and Reference
and the 3270 Personal Computer Graphics Control Program User's Guide containtwo appendixes that describe how to isolate and solve software problems.
At the host level, the following IBM software products help provide effective
problem determination:
NetView: A program that provides communication and data base facilities forcollecting, storing, and retrieving data on network errors. This program collects,
organizes, and displays error statistics, as well as data about communication
controllers, transmission lines, control units, and terminals. The supported SNA
environments include VTAM, TCAM, ACF/VTAM, and ACF/TCAM with NCP under
OS/VS, and ACF/VTAM and ACF/VTAME with NCP under DOS/VSE.
Display Exception Monitoring Facility (DEMF): This software tool for network
problem determination and isolation enhances the availability of the 3174, 3274,
and 3276 control units when operating in BSC mode.
Network Error Management Facility (NEMF) OS/DOS/CICS 5798-DAW: This
program collects, organizes, and displays error statistics and data aboutcommunication controllers, transmission lines, control units, and terminals. It also
helps locate a component causing problems. The supported communication
environments include BTAM and TCAM operating under OS/VS, and BTAM under
DOS/VS. When using SNA protocol, supported environments include EXTM andACF/VTAM with NCP under DOS/VS. (All environments require CICS.)
Facility Error Recognition System (FERS): This facility permits logging of 3270
display system and transmission line statistics at the host. The data retrieved
through FERS is used in problem determination for the suspected 3270 display
system.

Chapter 13: Problem Determination

13-1

13-2

IBM 3270 Information Display System Introduction

List of Abbreviations
bps. Bits per second.

A

BSC. Binary synchronous communication.
ae. Alternating current.
BlAM. Basic Telecommunications Access Method.
ACF/TCAM. Advanced Communications
Function/Telecommunications Access Method.
ACFIVTAM. Advanced Communications
Function/Virtual Telecommunications Access Method.
ACF/VTAME. Advanced Communications
FunctionlVirtual Telecommunications Access Method
Extended.

BTAM-ES. Basic Telecommunications Access
Method - Extended Support.
BTU. British thermal unit.

cC. Celsius, column.

ACK. Positive acknowledge.
C&D. Cause and diagnostic (codes).
ACTLU. Activate Logical Unit.
CAC. Common adapter code.
ACTPU. Activate Physical Unit.
CAD. Computer-Aided Design.
AID.

Attention identification.

All.

Alternate.

CAM. Computer-Aided Manufacturing.
CAW. Channel address word.
A/N. Alphanumeric.
CC. Control check, Chain Command (flag).
APA. All points addressable.
CCC. Copy control character.
APL. A programming language.
ARC. Adapter return code.
ASCII. American National Standard Code forInformation Interchange.

CCITT. International Telegraph and Telephone
Consultative Committee.
CCW. Channel control word.
CD. Change direction.

Atb. Attribute.
CEo Channel End.
ATTN.

Attention.
CECP. Country Extended Code Page

avg. Average.
efm. Cubic feet per minute.
AWG. American wire gauge.
Char. Character.

B
B.

CICS. Customer Information Control System.
Busy.

BB. Begin bracket.
BCC.

Block check character.

CID. Connection identifier.
em. Centimeter.
emnd. Command.

BETB. Between-bracket state.

CMS. Conversational Monitor System.

BIU.

Basic information unit.

CNCL. Cancel.

BOC.

Bus-out check.

List of Abbreviations

X-1

CNM. Communication network management.

deact. Deactivate.

coax. Coaxial (cable).

dec. Decimal.

comm. Communication.

DEL.

cont. Continuous.

OEMF.

cps. Characters per second.

OEV.

Command Reject.

CR.

Delete.
Display Exception Monitoring Facility.
Device.

OFT. Distributed function terminal.

CRC. Cyclic redundancy check.

OGM.

Data Grade Media.

CRT. Cathode-ray tube.

DISC. Disconnect.

CRY. Cryptographic Session Verification.

OLE. Data link escape.

CSU. Customer setup.

OM.

CSW. Channel status word.

~OS.

cll. Control.

DP.

ctr. Counter.

OPC. Dual-purpose connector.

CTS. Clear to Send.

DPKT. Default packet (size).

CU. Control unit.

DR. Definite response.

CUE. Control Unit End.

OSC.

Data stream compatibility.

CUG. Closed user group.

OSLo

Downstream load.

CUT. Control unit terminal.

OSR. Data set ready.

D

DTE. Data terminal equipment.

Disconnect mode.
Disk Operating System.
Distribution panel.

Duplicate.

OUP.
D.

Display.
DWND. Default window (size).
Data-access arrangement.

OAA.

OAF'. Destination address field prime (local addressof SLU).

E
EAS. Extended Area Service.

dB.

Decibel.
EAU. Erase All Unprotected.

DB. Device Busy.
EB.
OBCS.

End brackets.

Double-byte character set.

dBm. Decibels above one milliwatt.

EBCDIC. Extended binary-coded decimal interchange
code.

DC. Data Check.

EC.

DCE.

Data-circuit terminating equipment.

ECMA. European Computer Manufacturer's
Association.

~~S.

Digital Data Service.

Equipment Check, engineering change.

ECSA.

DE.

Extended Character Set Adapter.

Device End.
EFI. Expedited flow indicator.

X-2

IBM 3270 Information Display System Introduction

EIA.

Electronic Industries Association.

EM. End of message.

G
GOOM. Graphic Data Display Manager.

ENP. Enable Presentation.
GFI. General format identifier.
ENQ.

Enquiry.
GP. General Poll.

EOF. End of Field.
EOI.

End of Inquiry.

EOR.

End of Record.

EOT.

End of Transmission.

EPO.

Emergency Power Off.

EPSN.

Extended packet sequence numbering.

H
h. Coaxial cable type for indoor installation.
H. Height.

HOLC. High-Level Data Link Control.
Hex. Hexadecimal.

HNAO. Host network (DTE) address.

ERI.

Exception response indicator.

ERP.

Error recovery procedure(s).

ESC.

Escape.

ETB.

End of Transmission Block.

ETX.

End of Text.

I. Information (format).

EUA.

Erase Unprotected to Address.

IC. Insert Cursor.

E/W.

Erase/Write.

10. Identification, identifier.

HT. Horizontal Tab.
Hz.

Hertz.

EX. Exception (response).

ident.

F

IMl. Initial machine load, initial microcode load, initial
microprogram load.

F. Fahrenheit.
FCS.

Frame checking sequence.

FERS. Facility Error Recognition System.
FF. Forms feed.
FlO. Format identifier.
FIE. Function interpret error.
FM. Field mark, function management.

FMO. Function management data.
FMH. Function management header.
FRMR. Frame reject response.

ft.

Foot (or feet).

Identification.

IMS. Information Management System.
in.

Inch.

Ind. Indicator.
INS. Insert.
110. Input/output.
10PT. Incoming call option.
lOS. Input/Output Supervisor.
IPOS. Intelligent Printer Data Stream.
IR. Intervention Required.
IRS. Interrecord separator.
ITB. End of intermediate transmission block.

List of Abbreviations

X-3

K

M

KANA.
KB.

Katakana.

Kilobyte; 1024 bytes.

m.

Meter.

MAP.

Maintenance analysis procedure.

kbd. Keyboard.

max. Maximum.

kcal/hr.

MB. Megabyte; 1 048576 bytes.

Kilocalories per hour.

kg. Kilogram.

MDT. Modified data tag.

kVA. Kilovolt ampere.

MES.

L

MGN. Multiground neutral.

Miscellaneous Equipment Specification.

MHS. Magnetic hand scanner.
I. Coaxial cable type for indoor or outdoor installation.
min. Minimum, minute.
L.

Left.
MIS. Multiple interactive sessions.

LAPB. Link access procedure balanced.
mm. Millimeter.
lb. Pound.
modem. Modulator-demodulator.
LC. Logical channel.
MPF. Mapping field.
LCID. Logical channel identifier.
MPP. Maximum presentation position.
LED. Light-emitting diode.
MSR. Magnetic slot reader.
LF. Line feed.
MVS. Multiple virtual storage.
LlC. Last in chain.
LLC. Logical link control.

N

LNA. Logical network address.

NA. Not applicable.

LRC. Longitudinal redundancy check.

NAK. Negative acknowledge.

LU. Logical unit.

NAUN. Nearest active upstream neighbor.

lumens/m. Lumens per square meter.

NCCF. Network Communications Control Facility.

LU/SSCP. Logical unit/system services control point.

NCP. Network Control Program.

X-4

IBM 3270 Information Display System Introduction

NEC. National Electrical Code.

os.

NEMA. National Electrical Manufacturers Association.

p

NEMF.

Operating System.

Network Error Management Facility.
P. Printer, protected.

NETBIOS. Network Basic Input/Output System.
PA.

Program access.

NIA. Network Interface Adapter.
PAC.

Program authorized credentials.

NL. New Line.
PAM. Printer authorization matrix.
NMVT. Network Management Vector Transport.
PBX. Private branch exchange.
No. Number.
PC. Personal Computer.
NOLLC. No logical link control.
PCKT. Packet.
NOP. No operation.
PEL. Picture element.
NPDA. Network Problem Determination Application.
pF. Picofarad.
NPKT. Negotiated packet (size).
PF. Program function.
NRZ. Non-return-to-zero (recording).
PI. Pacing indicator.
NS. Nonsequenced (format).
PIC.

Problem isolation chart.

NTT. Nippon Telephone and Telegraph.
PID. Product-set 10.
NUL. Null.
PIU. Path information unit.
NUM. Numeric.
PLU.

Primary logical unit.

NWNO. Negotiated window (size).
POST. Power-On Self Test.

oPRID. Procedure-related identifier.

OAF'. Origin address field prime.

PS. Programmed Symbols, physical services.

OC. Operation Check.

PSDN. Packet switched data network.

OCIR. Operator Identification Card Reader.

PSH. Physical services header.

OCR. Optical character recognition.

PSI. Primary to secondary indicator.

00. Outside diameter.

PSWD. Password.

OEM. Original equipment manufacturer.

PT.

o'flo. Overflow.

PTT. Postal Telephone and Telegraph.

OFP. Optical fiber patch cable.

PU. Physical unit.

OFRPTR.

PVC. Permanent virtual circuit, polyvinyl chloride.

IBM 8219 Optical Fiber Repeater.

Program Tab.

OOPT. Outgoing call option.

List of Abbreviations

X-S

Q
QFRMR. Qualified frame reject response.
QLLC. Qualified logical link control.

RTS.

Request to send.

RU.

Request/response unit.

• RVI.

Reverse interrupt.

QRI. Queued response indicator.

s

QSM. Qualified set mode.

S. Sequenced (format), side.

R

SA. Selection addressing.
SABM. Set Asynchronous Balance Mode (command).

R.

Rear, row.

RA. Repeat to Address.
RB. Read Buffer.
RBM.

Read Buffer Modified.

Rd Mod. Read Modified.
ROL.

Remote Data Link.

REA.

Rural Electrification Administration.

RECFMS.

Record Formatted Maintenance Statistics.

reI.

Relative.

Req.

Request.

SARM. Set Asynchronous Response Mode.
SBA. Set Buffer Address.
SCR. Silicone-controlled rectifier.
SCS. SNA character string.
SOLC. Synchronous Data Link Control.
sec. Second.
SF. Special feature, specify feature, start field.
SHF. Set Horizontal Format.
SI. Suppress Index.
SIOF. Start I/O Fast Release.

REQMS. Request Maintenance Statistics.
resp.

Response.

RFI.

Radio-frequency interference.

RH.

Request/response· header.

RM.

Read Modified.

rms.

Root-mean-square.

RNR.

Request not ready, receive not ready.

RPOA.

Recognized private operating agency.

SLU. Secondary logical unit.
SM. Status modifier.
SMS. Switching Management System.
SNA. Systems network architecture.
\ SNBU. Switched network backup.
?NF. Sequence number field.
\

\

S~RM.

Set Normal Response Mode.

RPQ.

Request for price quotation.

SOEMI. Serial Original Equipment Manufacturer
Interface.

R/R.

Request/response.

SOH. Start of heading.

RR.

Request ready, receive ready.

sol. Solicited.

RSP.

Response.

SOR. Start of record.

Rt.

Right.

RTM.

Response Time Monitor.

X-6

IBM 3270 Information Display System Introduction

SP. Space, Specific Poll.
SPO. Selector pen detect.

SPF. System Productivity Facility.
SRM. Set Reply Mode.
SS. Surge suppressor.
SIS. Status and sense.

SSCP. System services control point.
SSR. Secure string record.
STX. Start of text.
SUB. Substitute.
SVC. Switched virtual circuit.
SVF. Set Vertical Format.
sw. Switch.
SYN. Synchronous idle.
SYSREQ. System request.

uU. Unprotected.
UA. Unnumbered acknowledgment.
UC. Unit check.
UE. Unit exception.
UKPSS. United Kingdom Packet Switching Service.
UL. Underwriters Laboratory.
unsol. Unsolicited.
US. Unit Specify.
U.S. United States.

v
V. Volts.
veet. Vector.

T
TA. Terminal adapter.
TAF. Target address field.
TC. Transmission check.
TCAM. Telecommunications Access Method.
TCLS. Throughput class.
TCU. Transmission control unit.
TH. Transmission header.
TMA. Terminal multiplexer adapter.
TP. Teleprocessing.
TS. Transmission services.
TSO. Time Sharing Option.
TTD. Temporary text delay.

VFC. Vertical forms control.
VPD. Vital product data
VS. Virtual storage.
VSE. Virtual Storage Extended.
VSPC. Virtual Storage Personal Computing.
VTAM. Virtual Telecommunications Access Method.
VTAME. Virtual Telecommunications Access Method
Extended.

w
WACK. Wait before transmit positive acknowledge.
WCC. Write control character.
WE. Western Electric.
WNDO. Window.

. List of Abbreviations

X-7

WSF. Write Structured Field.

x

WT. World Trade.
XGA.

x-a

IBM 3270 Information Display System Introduction

Extended Graphics Adapter.

Glossary
This glossary includes terms and definitions from the
IBM Dictionary of Computing: Information Processing,
Personal Computing, Telecommunications, Office
Systems, IBM-specific Terms, SC20-1699.

alert. In the IBM Token-Ring Network Manager, anotification appearing on the bottom line of any panel toindicate an interruption or a potential interruption in theflow of data around the ring.

The terms in this glossary are defined here as they
apply to the 3270 Information Display System.

alphanumeric field. A field that may contain anyalphabetic, numeric, or special characters.

A
access control byte. The byte following the startdelimiter in a token or frame. It is used to control
access to the ring.

alternate character set. A character set, located in theterminal, from which characters are obtained for
display and printing by using the graphic escapecharacter in the data stream.
alternate cursor. An image reversal of each dot in thecharacter cell at the cursor position.

access method. A technique for moving data between
main storage and input/output devices.

ambient. Environment.

access priority. The maximum priority that a token canhave for the adapter to use it for transmission.

appendage. An application program routine provided
to assist in handling a specific occurrence.

access procedure. The procedure or protocol used togain access to a shared resource. In a Token-Ring
network the shared resource is the medium. The
medium access procedures specified by the IEEE 802
standard are CSMA/CD token, bus, and ring.

application program. A program written for or by auser that applies to the user's work. Some application
programs run on a special kind of application program
called a network application program. See network
application program.

access unit. See multistation access unit.

attach. To connect a device logically to a ring network,so that it can communicate over the network.

active. Able to communicate on a network. An
adapter is active if it is able to pass tokens on the
network.
active monitor. A function in a single adapter on a ring
network that initiates the transmission of tokens andprovides token error recovery facilities. Any active
adapter on the ring has the ability to provide the active
monitor function if the current active monitor fails.
adapter. In the IBM Token-Ring Network, the circuit
card within a communicating device, and its associatedsoftware, that enables the device to communicate overthe network.
Adapter Support Interface. The software used tooperate IBM Token-Ring Network Adapters in an IBM
Personal Computer and to provide a common interface
to application programs.
adjusted ring length. In a multiple-wi ring-closet ring,
the adjusted ring length is the sum of all wiring
closet-to-wiring closet cables in the main ring path lessthe length of the shortest of those cables.

attaching device. Any device that is physicallyconnected to a network and can communicate over the
network.
attention. An I/O interruption generated
asynchronously by a display station, usually as a resultof an action taken by the operator of the device.
attention identification (AID). A code that the terminal
sends in the inbound data stream to identify theoperator action or structured field function that caused
the data stream to be sent to the application program.
An AID is always sent as the first byte of the inbounddata stream. Structured fields in the data stream may
also contain an AID over the network.
attenuation. A decrease in power from one point toanother. In optical fibers, the optical power loss perunit of length is expressed in decibels per kilometer(dB/km) at a specific wavelength.
attribute. A characteristic.

Glossary

X-9

attribute select keyboard. A keyboard that enables theoperator, when permitted by the program, to change
the character attributes of the keyed-in character.
attribute type. A code that identifies thecharacteristics from which the associated set of
attribute values can be selected. See also extended
c%r, extended highlighting, and character set.
attribute value. A code immediately following theattribute type in the data stream that specifies aparticular characteristic from the set defined by theattribute type.
audible alarm. A special feature that sounds a short,
audible tone automatically when a character is enteredfrom the keyboard into the next-to-Iast character
position on the screen. The tone can also be sounded
under program control.
auto removal. Removing a device from the datapassing activity without human intervention. Thisaction is accomplished by the adapter.
auto-skip. Same as automatic skip.
automatic polling. (1) A hardware feature of atelecommunication unit that processes a polling list,
polling the terminals in order and handling negative
responses to polling without interrupting theprocessing unit. At the end of the list, polling is
automatically begun again at the beginning of the list.
Synonymous with autopoll. (2) See also polling.
automatic skip. After entry of a character into the last
character position of an unprotected display' field,
automatic repositioning of the cursor from a protected
and numeric field to the first character position of thenext unprotected display field.
autopoll. Same as automatic polling.

bandwidth. The difference, expressed in Hertz,
between the highest and the lowest frequencies of arange of frequencies.
baseband Token-Ring network. A Token-Ring networkin which information is encoded, multiplexed, andtransmitted without modulation of a carrier.
base color. The capability to display or print all
characters in a field, in one of four colors, on a color
terminal by using combinations of the field protection
and the field intensify bits of the field attribute.
beacon. A frame sent by an adapter indicating aserious ring problem, such as a broken cable. An
adapter is said to be beaconing if it is sending such aframe.
binary synchronous communication (8SC). Datatransmission in which character synchronism iscontrolled by timing signals generated at the sending
and receiving stations.
blink. An extended highlighting attribute value (foremphasis) of a field or character.
block matrix. The total array of dots that can be used
to describe a graphic character for a 3270 display or
printer.
bracket. In VTAM, an exchange of data between an
application program and a logical unit that
accomplishes some task.
bridge. An attaching device connected to two rings
simultaneously to allow the transfer of information fromone ring to the other. Rings joined together by bridges
form multiple-ring networks.
bridge number. The identifier that distinguishes
parallel bridges (that is, bridges spanning the same tworings).

B
backbone. A transmission facility that interconnects
bridges in hierarchical networks.
backbone ring.
networks.

A ring that interconnects ring

backup path. An alternative path for Signal flow
through access units and their main ring path cabling.
The backup path allows recovery of the operational
portion of the network while problem determinatio'n
procedures are being performed.
balun. A transformer for connecting balanced (forinstance, twisted-pair) cables to unbalanced (for,X-10

instance, coaxial) cable by matching the electricalcharacteristics of the cables.

IBM 3270 Information Display System Introduction

broadband Token-Ring network. A Token-Ring
network in which information is encoded, multiplexed,
and transmitted with modulation of carriers.
broadcast topology. A network topology in which all
attaching devices are capable of simultaneously
receiving a signal transmitted by any other attaching
device on the network.
buffer. A storage area reserved for use in performing
input/output operations.
buffer address. The address of a location in the buffer
at which one character can be stored.

bus. A type of network topology where the network
consists of a bidirectional communication path withdefined end pOints.

stored and executed in the unit, or it may be controlled
entirely by hardware. (2) See also communication
control/er.

bypass. To eliminate an attaching device or an access
unit from a ring network by allowing the data to flow ina path around it.

coaxial cable. A cable consisting of one innerconductor within,and insulated from, an external
shield.

ccode violation. In differential Manchester code
encoding, a bit that does not have a state transition at
the mid-bit pOint. See differential Manchester code.

category A terminals. Terminals that can be attachedto the 3174 and to type A adapters in the 3274; forexample, the 3278 and 3279 display stations, the 3287
Models 1, 1C, 2, and 2C, the 3262 Models 3 and 13, andthe 3289 Models 1 and 2.
category B terminals. Terminals that can be attachedto type B atiapters in the 3274; for example, the 3277
display station, 3284, 3286, 3287 Models 1 and 2, and
3288 Printers.
channel-attached. Pertaining to the direct attachmentof devices by channels to a host processor. Contrast
with telecommunication-attached.
character attribute. The properties of a character withrespect to its color, highlighting, and character set.
See also extended field attribute.
character buffer. The read/write storage used by apartition for storing character or graphic data fordisplay or printing on a terminal.
character position. A location on the screen at which
one character can be displayed; also, an addressed
location in the buffer at which one character can be
stored.
character set. (1) A defined collection of characters ina loadable or nonloadable set selected by means of a
local character set identifier. (2) An attribute type inthe extended field and character attributes. (3) An
attribute passed between session partners in the Start
Field Extended, Modify Field, and Set Attribute orders.
cladding. Glass of a low refractive index thatsurrounds the core of an optical fiber.
clear indicator. In VTAM, a SESSIONC indicator sentby one node to another that prevents the exchange ofmessages and responses.
closed path (or network). A network in which all thecable paths and wiring closets are directly or indirectly
connected.
cluster control unit. (1) A device that can control the
input/output operations of more than one device. A
remote cluster control unit can be attached to a hostprocessor only via a communication controller. A
cluster control unit may be controlled by a programcommand. An instruction that directs a control unit ordevice to perform an operation or a set of operations.
communication controller. (1) A type ofcommunication control unit whose operations arecontrolled by a program stored and executed in theunit. Examples are the IBM 3704 and 3705
Communications Controllers. (2) See also cluster
control unit.
completion code. The final return code provided by
the adapter as a result of an issued command.
component. Any part of a network other than an
attaching device, such as an access unit.
connecting blocks. Fixtures used to terminate
telephone wires in a wiring closet.
control block. In the IBM Token-Ring Network, a
specifically formatted block of information provided
from the application program to the Adapter Support
Interface to request an operation.
control character. A character used in conjunction
with a Write command to specify that a control unit is toperform a particular operation.
control codes. The hexadecimal values hex 00 throughhex 3F, and hex FF in the 3270 data stream.
control disk. A customized diskette or disk containing
the microcode that descibes a particular control unit's
attached terminals, and its method of attachment to thehost.
controller. A unit that controls input/output operations
for one or more devices.
conven~ionaI3270.

A locally attached 3270 terminal ora remotely attached 3270 terminal that uses the BSC
line discipline.

copy control character (CCC). A character used inconjunction with the Copy command to specify the typeof data to be copied.
copy operation. An operation that copies the contentsof the buffer from one display station or printer toGlossary

X-11

another display station or printer attached to the same
control unit.
core. The light-transmitting center of an optical fiber.

definite response 1. In VTAM, a response that. indicates whether its associated message was
successfully forwarded to its final destination (such as
the display screen of an output device).

cu·rsor. A unique symbol that identifies a character
position in a screen display, usually the character
position at which the next character to be entered fromthe keyboard will be displayed.

definite response 2. In VTAM, a response thatindicates that the node sending the response has
accepted recovery responsibility for the associatedmessage.

cyclic redundancy check. A system of error checki ng
performed at both the sending and receiving station
after a block check character sequence has been
accumulated.

delimiter. A bit pattern that defines the limits of aframe on a Token Ring network.

Ddata circuit-terminating equipment (DCE). The
equipment installed at the user's premises thatprovides all the functions required to establish,
maintain, and terminate a connection, and the signal
conversion and coding between the data terminal
equipment (DTE) and the line.
data frame. See frame.
data link. Any physical link, such as a wire or atelephone circuit, that connects one or more devices orcommunication controllers.
data link layer (or level). In open systems
architecture, the layer that provides the functions andprocedures used to establish, maintain, and releasedata link connections between elements of the network.
data station. See station.
data stream. All data transmitted through a channel ina single read or write operation to a display station or
printer.
data terminal equipment (DTE). Equipment that sends
or receives data, or both.
data transfer. In telecommunication, the sending ofdata from one node to another.
data transfer mode. A set of facilities (including themacro instructions needed to use them) that enable theapplication program to communicate with terminals.
datagram. A particular type of information
encapsulation at the network layer of the adapter
protocol for the Network Basic Input/Output System(NETBIOS). No explicit acknowledgment for the
information is sent by the receiver. Instead,transmission qalies on the "best effort" of the link layer.
decibels above one milliwatt. A unit of absolute power
measurement that is scaled such that zero dBm equals
one milliwatt.

X-12

IBM 3270 Information Display System Introduction

designator character. A character that immediately
follows the attribute character in a
selector-pen-detectable field. The designator character
controls whether a detect on the field will or will notcause an attention. For a nonattention-producing field,
the designator character also determines whether themodified data tag for the field is to be set or reset as aresult of a selector-pen detect.
detectable. An attribute of a display field; determines
whether the field can be sensed by the selector pen.
device. An input/output unit such as a terminal,
display station, or printer. See attaching device.
diagnostics diskette. A diskette used by computer
users and service personnel to diagnose hardware
problems.
dielectric. Nonconductor of direct electric current.
differential Manchester code. A data-encoding method
used by the IBM Token-Ring Network. In this method, a
bit has the value of binary a if there is a state transition(polarity change) at the beginning of the bit boundary.
The bit has the value of binary 1 if there is notransition. In a properly encoded bit, there must·
always be a transition at every midpoint position. If thetr~nsition is absent, a code violation results. Since
only the presence or absence of the state transition(and not the actual polarity) determines a bit's value,
this method of coding is polarity-independent.
display field. A group of consecutive characters (in thebuffer) that starts with an attribute character (defining
the characteristics of the field) and contains one ormore alphanumeric characters. The field continues to,but does not include, the next attribute character.
distribution panel. A wiring board that provides apatch panel function and mounts in a rack.
dot. One point in a printer or display block matrix.
downstream. On a ring network, the direction of data
flow. Contrast with upstream.

drop. A cable that leads from a faceplate to the
distribution panel in a wiring closet. When the IBM
Cabling System is used with the IBM Token-Ring
Network, a drop may form part of a lobe. See lobe.

Eequipment rack. A metal stand for mounting network
components, such as distribution panels and IBM 8228
Multistation Access Units.

F
faceplate. A plate for connecting data and voice
connectors to a cabling system. It may bewall-mounted or surface-mounted.
fault domain. In IBM Token-Ring Network problem
determination, the portion of a ring that is involved withan indicated error.
field. See display field.

equipotential bonding. A means of limiting ground
potential differences within a building.
Erase All Unprotected (EAU) command. A commandthat clears all unprotected fields to nulls, resets
modified data tags in all unprotected fields, unlocks the
keyboard, resets the attention identifier, andrepositions the cursor to the first character of the first
unprotected field.
Erase Unprotected to Address (EUA) order. An orderthat erases all unprotected positions (inserts nulls)
from the current buffer address up to, but not including,the specified stop address.
Extended Attribute Buffer (EAB). A buffer for storing
extended field attributes and character attributes.
extended color. (1) A capability that allows color
terminals to display or print fields or characters incolors using extended field and character attributes.
(2) An attribute type in the extended field attribute andcharacter attribute.
extended field attribute. Additional field definition to
the field attribute that controls defining additional
properties such as color, highlighting, character set,
and field validation. The extended field attribute isaltered by information passed in the Start Field
Extended and Modify Field orders.
extended highlighting. (1) A function that provides
blink, reverse video, and underscore for emphasizing
fields or characters on devices supporting extended
field attributes and character attributes. (2) An
attribute type in the extended field attribute andcharacter attribute. (3) An attribute passed between
session partners in the Start Field Extended, Modify
Field, and Set Attribute orders.

field attribute. A control character stored in thecharacter buffer in the first character position of a field.
For those devices supporting the 3270 data stream, afield attribute defines protected/unprotected,alphanumeric/numeric, detectable/nondetectable,
display/nondisplay, intensity, and modified data tag.
...
field inherit. A bit setting in the character attribute that
defaults the character properties to the extended field
attributes or device default if the buffer is unformatted.
FME response. See definite response 1.
formatted diskette. A diskette that can be used by thecomputer to store data.
formatted display. A screen display in which a display
field, or fields, has been "defined as a result of storing atleast one attribute character in the display buffer.
frame. The unit of transmission in the IBM Token-Ring
Network. It includes delimiters, control characters,
information, and checking characters.

Ggateway. A device and its associated software thatinterconnect Token-Ring networks that use different
logical link protocols.
general polling. (1) An input technique for remote
3270 devices in which special invitation characters aresent to a device control unit instructing that control unit
to begin transmission from all devices ready to enter
data. (2) See also polling and specific polling.

Glossary

X-13

H

L

hard error. A error condition on a Token-Ring networkthat requires that the ring be reconfigured or that thesource of the error be removed before the ring canresume reliable operation.

layer. One of the seven layers of the Open Systems
Interconnection reference model.

hertz (Hz). A unit of frequency equal to one cycle persecond.
hierarchical network. A multiple-ring network
configuration providing only one path throughintermediate rings between source rings anddestination rings. Contrast with mesh network.
hop count. The number of bridges through which aframe has passed on the way to its destination.
hop count limit. The maximum number of bridges
through which a frame may pass on the way to its
destination.

leased line. See nonswitched line.
Library disk. A diskette or fixed disk that contains
customizing data for some or all of the control units in a
network.
limited broadcast. The forwarding of speciallydesignated broadcast frames only by bridges that are
enabled to forward them.
line control characters. Characters that regulate thetransmission of data over a line; for example,
delimiting messages, checking for transmission errors,
and indicating whether a station has data to send or isready to receive data'.
link. The logical connection between nodes including
the end-to-end link control procedures.

idles. Signals sent along a ring network when neither
frames nor tokens are being transmitted.
input device. A device in a data processing system bywhich data may be entered intq the system.
Insert Cursor (IC) order. An order that displays the
cursor at the current buffer address.
intensified display. An attribute of a display field;
causes data in that field to be displayed at a brighter
level than other data displayed on the screen.
intermediate telephone closet. A room containing
connection pOints for telephone wiring, locatedbetween_ the main telephone closet and work areas.

link station. (1) A specific place in a service accesspoint that enables an adapter to communicate withanother adapter. (2) A protocol machine in a node thatmanages the elements of procedure required for theexchange of data traffic with another communicating
link station.
lobe. In the IBM Token-Ring Network, the section ofcable (which may consist of several segments) thatconnects a device to an access unit.
lobe logic. The portion of the circuitry within anaccess unit that is associated with a single lobe
receptacle on the access unit.

J
jack. A connecting device to which a wire or wires of acircuit may be attached and that is arranged for
insertion of a plug.

X-14

link connection. All physical components and protocol
machines that lie between the communicating linkstations of a link. The link connection may include aswitched or leased physical data circuit, a Token-Ring
network, or an X.25 virtual circuit.

IBM 3270 Information Display System Introduction

lobe receptacle. An outlet on an access unit forconnecting a lobe.

local area network. A network in which
communications are limited to a moderate-sized
geographic area such as a single office building,warehouse, or campus and which do not generally
extend across public rights-of way.

by a selector-pen detection in the field, program
control, or the ERASE INPUT key.

logical link control procedure. In a Token-Ring
network, the part of the protocol that governs theassembling of transmission frames and their exchange
between data stations independently of how thetransmission medium is shared.

modulator-demodulator (modem). A device thatmodulates and demodulates signals transmitted overcommunication facilities.

logical unit. The combination of programming andhardware of a teleprocessing subsystem thatcomprises a terminal for a SNA access method.
loop. A closed unidirectional signal path connecting
input/output devices to a network.

M
MAC frame. Frames that control the operation of the
IBM Token-Ring Network and any ring station
operations that affect the ring.

Modify Field (MF). An order that allows specified field
attributes to be modified.

multistatlon access unit. In the IBM Token-Ring
Network, a wiring concentrator that can connect up to
eight lobes to the network.

Nnearest active upstream neighbor (NAUN). Nearest
active upstream neighbor. For any given attaching
device on a ring network, the attaching device that issending data directly to it.

main ring path. The part of the ring made up of accessunits and the cables connecting them.

Netview. A program that provides communication anddata base facilities for collecting, storing, andretrieving data on network errors. This program
collects, organizes, and displays error statistiCS, aswell as data about communication controllers,
transmission lines, control units, and terminal.

main telephone closet. A room where telephone
cables enter a building and are connected to building
telephone wiring.

network. (1) An interconnected group of nodes. (2)The assembly of equipment through which connections
are made between data stations. See token ring.

maintenance analysis procedure (MAP). A documentthat gives the customer or service representative a
step-by-step procedure for tracing a symptom to thecause of failure.

network administrator. A person who manages theuse and maintenance of a network.

medium. A physical carrier of electrical energy.
medium access control (MAC) procedure. In a
Token-Ring network, the part of the protocol thatgoverns access to the transmission medium
independently of the physical characteristics of themedium, but taking into account the topological ~spectsof the network, in order to enable the exchange of data
between data stations.
mesh network. A multiple-ring network configuration
providing more than one path through intermediaterings between source rings and destination rings.
Contrast with hierarchical network.
modified data tag (MDT). A bit in the attributecharacter of a display field, which, when set, causesthat field to be transferred to the channel during aread-modified operation. The modified data tag may be
set by a keyboard input to the field, a selector-pen
detection in the field, a card read-in operation, or
program control. The modified data tag may be reset

network application program. A program used toconnect and communicate with adapters on a network,
enabling users to perform application-oriented
activities and to run other application programs.
node. An endpoint of a link or a junction common to
two or more links in a network.
nonswitched line. A connection between a remote
3270 unit and a computer that does not have to beestablished by dialing.

oobserver terminal. In problem determination for the
IBM Token-Ring Network, the device used to run the
Ring Diagnostic or a network application program thatis capable of providing ring status information.
office. See work area.
ohm. The practical meter-kilogram-second unit ofelectric resistance equal to the resistance of a circuit inwhich a potential difference of 1 volt produces a currentof 1 ampere.

Glossary

X-1S

open. (1) To make an adapter ready for use. (2) A
break in an electrical circuit.

, Power-On Self Test (POST). A series of diagnostic
tests that are run each time the computer's power isturned on.

operational diskette. See working diskette.
optical fiber. A single, separate optical transmission
element comprising a core and a cladding.
optical fiber cable. One or more optical fibers withstrengthening material and a protective cover.
optical fiber connector. Hardware installed on opticalfiber cable ends to provide physical and optical cableattachment to a transmitter, a receiver, or acommunication patch panel.
order code. A code that may be included in the write
data stream transmitted for a display station or printer;
provides additional formatting or definition of the write
data.
order sequence. A sequence in the data stream thatstarts with an order code and includes a character
address and/or data characters related to the ordercode.
outgoing group. In systems with TCAM, that section ofa message handler that manipulates outgoingmessages after they have been removed from theirdestination queues.
output device. A device in a data processing systemby which data may be received from the system.

Prepare to Read (PTR). A command for a local 3274
Model 1D that allows the terminal to know the next
program action.
private branch exchange (PBX). A private telephoneexchange, automatic or manual, that provides for thetransmission of calls to and from the public telephone
network.
problem isolation chart (PIC). A diagnostic procedurefor finding problems with a personal computer or its
options.
program attention key. Any key on the keyboard thatsolicits program action by generating an 110
interruption. The keys are the CLEAR key, ENTER key,
CNCL key, program function keys, and program accesskeys. Each program attention key is associated with aunique attention identification (AID) character.
program function (PF) key. A program attention key
that may be defined to solicit program action thatusually requires data to be read from the buffer of thedisplay station. If a Read Modified command is issued
in response to the program function key interruption,
the attention identifier (AID) and all display fields inwhich the modified data tags are set are transferred tothe program.

p

Program Tab (PT) order. An order that advances thecurrent buffer address to the address of the firstcharacter location of the next unprotected field.

passive wiring concentrator. A wiring concentrator
that does not require a power source. See wiring
concentrator.

Programmable Symbols (PS). Customer-defined
symbols, a maximum of 190 symbols to a programmed
symbol set.

patch cable. In the IBM Cabling System and the IBM
Token-Ring Network, a length of type 6 cable with data
connectors on both ends.

protected field. A display field for which the display
operator cannot use the keyboard or operator
identification card reader to enter, modify, or erase
data. ,

path. In a network, a route between any two nodes.
path trace. A function that may be requested of abridge by a received frame. The request is for a recordof the bridges through which the frame has passed.
plenum cable. A cable that is UL-listed as having
adequate fire resistance and low smoke-producing
characteristics for installation without conduit in ducts,
plenums, and other spaces used for environmental air,as permitted by NEC Articles 72S-2(b) and 800-3(d).
polling. A technique by which each of the terminals
sharing a communication line is periodicallyinterrogated to determine whether it requires servicing.

X-16

IBM 3270 Information Display System Introduction

protocol. (1) The set of rules governing the operationof functional units of a communication system that mustbe followed if communication is to be achieved. (2) A
procedure for ordering the exchange of formatted
information packets between correspondents.
Protocols are interpreted by hardware and software
within the adapter.
protocol handler. Programming in an adapter that
encodes and decodes the protocol used to format
Signals sent along a network.

Rrouting. The assignment of the path by which amessage will reach its destination.

rack inventory chart. A chart indicating the location of
the components installed in the rack.

RRN response. See definition response 2.

read-only memory (ROM). A computer's storage area
whose contents cannot be modified.

5

Receive receptacle. On the IBM 8219 Optical Fiber
Repeater, the receptacle that receives the signal in themain ring.

segment. A section of cable between components ordevices on the network. A segment may consist of asingle patch cable, multiple patch cables connected
together, or a combination of building cable and patch
cables connected together.

receptacle. See lobe receptacle.
register. A storage area in a computer where specificdata is stored.
remove. To take an attaching device off the ring.
Repeat to Address (RA) order. An order that stores a
specified alphameric or null character in up to 480
buffer locations, starting at the current buffer addressand ending at, but not including, the specified stop
address.
repeater. In a ring network, a device that amplifies orregenerates data signals in order to extend the
distance between attaching devices.
return code. A hexadecimal value provided by theadapter to indicate the result of an action.
ring (network). A network configuration where a seriesof attaching devices are connected by unidirectionaltransmission links to form a closed path.
Ring Diagnostic. In the IBM Token-Ring Network, aprogram to be run in an IBM Personal Computer thatprovides the user information regarding theperformance of the ring.
ring error limit. In the Ring Diagnostic, the point at
which the number of soft errors can make ring
operation unreliable.
ring in (RI). On an access unit, the receive or input
receptacle.
ring out (RO). On an access unit, the transmit or
output receptacle.
ring sequence. The order in which devices areattached on a ring network.
ring status. The condition of the ring.
ring topology. A logically circular, unidirectionaltransmission path without defined ends. Control can be
distributed or centralized.

selector pen. A pen-like instrument that may be
attached to the display station as a special feature.
When pOinted at a detectable portion of an image andthen activated, the selector pen senses the presence oflight at a display field and produces a selector-pen
detect.
selector-pen detect. The sensing by the selector penof the presence of light from data in a display field thathas the detectable attribute. Depending on thedesignator character of that display field, the detection
and location information is identified on the screen(and stored in the buffer) or may produce an interrupt
that is transmitted to the CPU. units that can be
activated, tailored to provide various protocols, anddeactivated as requested.
server. A device on a network dedicated to specificfunctions.
service access point. A logical point made available
by an adapter where, information can be received andtransmitted. A single SAP can have many links
terminating in it.
service clearance. Minimum space required to allow
working room for the machine operator and/or thecustomer engineer for servicing the unit.
session. (1) A connection between two application
programs that allows them to communicate. (2) In SNA,a logical connection between two network addressable
units that can be activated, tailored to provide various
protocols, and deactivated as requested.
SESSIONC indicators. In VTAM, indicators that can besent from one node to another without using SEND or
RECEIVE macro instructions. SOT, clear, and STSN are
SESSIONC indicators. All SESSIONC indicators aresent with a SESSIONC macro instruction.
Set Attribute (SA) order. An order that associates
attributes in the EAB with individual characters.
Set Buffer Address (SBA) order. An order that sets thebuffer address to a specified location.

Glossary

X-17

shared RAM. Random access storage on the adapterthat is shared by the IBM PC.

Tsoft error. An intermittent error on a network thatcauses data to have to be transmitted more than once
to be received. A soft error does not, by itself, affectthe network's overall reliability. If the number of soft
errors reaches the ring error limit, reliability isaffected.

telecommunication-attached. Pertaining to theattachment of devices to a central computer through acommunication control unit. Contrast withchannel-attached.

specific polling. (1) A polling technique that sends
invitation characters to a device to find out whether thedevice is ready to enter data. (2) See also generalpolling and polling.
star. A writing arrangement in which an individual
cable runs from each work area to a concentration
point.
start delimiter. The first byte of a token or frame. It
consists of a special recognizable bit arrangement.
Start Field (SF) order. An order that indicates a
specified location which contains an attribute byte andnot a text character.
Start Field Extended (SFE) order. An order thatgenerates an extended field attribute in the EAB and at
the current buffer location.
station. (1) A work station. (2) A communication
device attached to a network. The term used mostoften in the IBM Token-Ring Network.
structured field. A data stream format that permits
variable-length data and controls to be parsed into its
components without having to scan every byte.

telecommunication network. In a telecommunication
system, the combination of all terminals and othertelecommunication devices and the lines that connectthem.
terminal. (1) A pOint in a system or communication
network at which data can either enter or leave.
(2) Any device capable of sending and receiving
information over a communication channel.
terminal-initiated logon. A logon request thatoriginates from the terminal.
terminal multiplexer. A device, such as the 3299
Terminal Multiplexer, for interleaving the Signals formany devices onto a single coaxial cable.
terminating room. See wiring closet.
token. A sequence of bits passed from one device toanother along the network. When the token has data
appended to it, it becomes a frame.
token monitor. Synonym for active monitor.
token ring. A network with a ring topology that passes
tokens from one attaching device to another.
transmission medium. A physical carrier of electricalenergy or electromagnetic radiation.

Suppress Index (SI) order. An order that generates the
suppress index character, valid only for the 3288-2
printer. This character inhibits a line index to allow
overprinting.

Transmit receptacle. On the IBM 8219 Optical Fiber
Repeater, the receptacle that transmits the signal in themain ring.

switched line. A communication line in which theconnection between the computer and a remoteterminal is established by dialing.

twinaxial cable. A shielded cable with two conductors
inside a larger conductor. The conductors are
insulated from the larger conductor and from eachother.

uunformatted display. A screen display in which no
attribute character (and, therefore, no display field) has
been defined.

X-18

IBM 3270 Information Display System Introductionunprotected field. A display field for which the display
station operator can manually enter, modify, or erase
data.
upstream. On a ring network, the direction oppositethat of data flow. Contrast downstream.
Utility disk. A diskette or fixed disk that contai ns the
microcode necessary to run various customizing
utilities, for example, to copy portions of a diskette for a
backup diskette.

v
vertical drop distance. The vertical distance from thefaceplate to the raceway, which is in either the ceilingor the floor.

wwide area network. A network that provides data
communication capability in geographic areas larger
than those serviced by local networks.
wire fault. An error condition caused by a break in thewires or a short between the wires (or shield) in asegment of cable.
wiring closet. A room that contains one or moreequipment racks and distribution panels that are used
to connect cables together to form physical networks.

wiring concentrator. A lobe concentrator that allows
multiple attaching devices access to the ring at a
central pOint such as a wiring closet or in an open work
area.
work area. An area in which terminal devices (such as
displays, keyboards, and printers) are located. Accessunits may also be located in work areas.
work station. An input/output device that allows
transmission of data or reception of data as needed toperform a job.
working diskette. A computer diskette to which files
are copied from an original diskette for use in everyday
operation.
wraparound. The continuation of an operation (forexample, a read operation or a cursor movement
operation) from the last character position in a buffer tothe first character position in the buffer.
write control character (WCC). A character used inconjunction with a Write command to specify that a
particular operation, or combination of operations, is tobe performed at a display station or printer.
Write Structured Field (WSF) command. A command
used for processing structured fields.

33270 data stream. A coded character data stream.

Glossary

X-19

X-20

IBM 3270 Information Display System Introduction

IndexIndex
Aadapters
AEA
See Asynchronous Emulation Adapter (AEA)
alarm, audible 9-2
alert 1-5, 9-2
all points addressability (APA) 7-9
alphanumeric fields 9-1
ASCII emulation
destination menu 7-6
host attachment 7-4
keyboard 7-4
modems 7-6
printer 7-4
security 7-6
terminal 7-4
Asynchronous Emulation Adapter (AEA)
ASCII passthrough 7-4
ASCII terminal emulation 7-4
description 7-3functional description 7-4
support 7-4
3174 Subsystem Control Unit 7-3
3270 terminal emulation 7-4
attaching terminals 7-14
Attribute Select Overlay keyboard 2-5
audible alarm 9-2
audible alarm, printer 9-2

Bbase color 2-4
SSC copy command 9-2
SSC protocol 9-2, 10-1
business applications 2-4

Ccable lengths 8-1
capabilities
color applications 2-4
data entry 2-1
document development 2-3
graphics 2-4
inquiries 2-1
inquiry with file update 2-1
monitoring system operation
personal computing 2-3
program development 2-3
programmed symbols 2-5
security enhancements 2-6
security keylock 2-6
Simple inquiry 2-1

2-3

capabilities (continued)
vector graphics 2-5
Central Site Change Management 7-8
central site customizing utility (CSCU)
description 7-7
file maintenance 7-7
hardware 7-7
host support 7-7channel interface speeds 9-2
character addressing 9-3
cluster 1-3
color applications
base colors 2-4
description 2-4
distinguishing data sources 2-4
distinguishing data types 2-4
extended colors 2-4
handling data codes 2-4
communication networks 10-3
complex inquiry 2-1
components, optional system
3299 Terminal Multiplexer 8-1
3814 Switching Management System 8-35209 Link Protocol Converter 8-4
components, system
cluster 1-3
overview 1-1
computer-assisted instruction 2-4
control unit
Central Site Change Management 7-8
central site customization utility (CSCU) 7-7
description 7-1
general information 1-3
grouped 7-15
local attachment 7-1
micocode support 7-15
problem determination 13-1
remote attachment 7-1
system support 10-2
3174 Model IL 7-19
3174 Model IR 7-20
3174 Model 2R 7-21
3174 Model 3R 7-22
3174 Model 51 R 7-23
3174 Model 52R 7-24
3174 Model 53R 7-24
3174 Model 81 R 7-25
3174 Model 82R 7-25
3174 Subsystem Control Unit 7-1
controlling system operation 2-3
Country Extended Code Page (CECP) 7-14
cross-industry licensed programs 11-2
CSCU
See central site customizing utility (CSCU)

Index

X-21

Indexcustomer setup
checkout 12-1
descri ption 12-1
general information 1-5
i nstructi ons 12-1
physical setup 12-1
setup units 12-1

Ddata base data communication systems 11-3
data entry
editing tools 2-1
entry sequence 2-2
features 2-1
formatted entry 2-2
highlighting 2-2
keyboard 2-1
magnetic hand scanner 2-1
magnetic slot reader 2-1
nondisplayed fields 2-2
protected fields 2-2
special keys 2-2
data links 10-1
data processing system 1-3
development center 11-2
Display Exception Monitoring Facility (DEMF) 13-1
display stations
Asynchronous Emulation Adapter 7-3
functional description 3-1
general information 1-1
3191 3-2
3191 highlights 3-33192 3-4
3192 highlights 3-4
3193 3-6
3193 characteristics 3-7
3193 models 3-7
3194 3-83194 highlights 3-93290 data stream compatibility 3-113290 Information Panel 3-108525 combinations 4-6
document development 2-3Eencryption/decryption 2-6
engineering 2-4
Entry Assist 2-3, 3-11
Erase Unprotected 9-3
Erase/Write command 9-4
extended attribute 9-2
extended color 2-4, 9-2

X-22

ISM 3270 Information Display System Introduction

F
Facility Error Recognition System (FERS) 13-1
field attribute 9-1
format control 2-2
format control by data field 9-1
format control by data field and character 9-2
functional control capability
alert 9-2
audible alarm 9-2
sse copy command 9-2
sse protocol 9-2
character addressing 9-3
communication line speeds 9-3
description 9-1
Erase Unprotected 9-3
Erase/Write command 9-4
format control by data field 9-1
format control by data field and character 9-2
host-initiated local copy 9-3line speeds 9-3
local copy 9-3
null suppression 9-3
operator-initiated local copy 9-3
Program Tab 9-3
protected data image format 9-4
Read Modified command 9-4
remote general poll 9-4
repeat characters 9-4
SOLe protocol 9-2
Select 9-4
short read 9-4
Write command 9-4
Write Structured Field command 9-4
3174 channel interface speeds 9-2
3274 channel interface speeds 9-2

Ggraphics applications
business 2-4
computer-assisted instruction 2-4
engineering 2-4
flow diagrams 2-4graphic arts and publishing 2-4
schedules 2-4
technical data analysis 2-4
using vector graphics 2-5

H
hand scanner 2-6
highlighting 1-3,2-2
host 1-3
host addressable printer (HAP)
host-initiated local copy 9-3

7-5

IndexIBM Personal Computers
description 4-1
IBM 5560/50/40 Multiworkstations 4-2
IBM 6150 RT Personal Computer Models 4-4
IBM 6151 RT Personal Computer 4-5
IBM 8525 Personal System/2 4-6
IBM 8530 Personal System/2 4-8
IBM 8550 Personal System/2 4-10
IBM 8560 Personal System/2 4-12
IBM 8570 Personal System/2 4-14
IBM 8580 Personal System/2 4-16
IBM Token-Ring Network
attachment 10-2
3270 Gateway feature 7-11
IBM Token-Ring Network 3270 Gateway Featurecomponents 7-12
description 7-11
microcode 7-12
problem determination 7-13
program support 7-13
Token-Ring adapter 7-123174 relationship 7-12
image 1-3,2-5
information center 11-2
inquirecomplex 2-1
simple 2-1
with file update 2-1
installation planningdescription 12-1
publications 12-1
3299 Terminal Multiplexer 12-1
Intelligent Printer Data Stream (IPDS)
all points addressability (APA) support 7-9
description 7-9
error handling and recovery 7-10
functional description 7-9
programming dependencies 7-10
systemattachment 7-10
interactive programming support 11-3
IPDS
See Intelligent Printer Data Stream (IPDS)

K
keyboard
Attribute Select Overlay 2-5
attribute selection keys 5-5
cursor postioning 5-4
description 5-1
editing controls 5-4
general controls 5-3
general information 1-1
keyboard definition utility 5-5
keypad 5-5
layouts 5-5

keyboard (continued)
optional keypad 5-5
program access 5-4
program function (PF) keys 5-5
screen management 5-4
touch typing controls 5-1
typematic keys 5-1
keyboard definition utility 5-5
keyboards 1-3
keylock 2-6
keypad 5-5

Lline speeds 9-3
local attachment 10-1
local copy, host-initiated 9-3
local copy, operator-initiated 9-3
local customization 7-18
loop attachment 10-3Mmagnetic hand scanner 2-6
magnetic slot reader 2-6
microcode support
description 7-15
local customization 7-18
storage 7-18
3174 Configuration Support A 7-15
3174 Configuration Support S 7-15
3174 storage expansion 7-18
modems 10-1,10-3
monitoring system operation 2-3
Multiple Logical Terminal (MLT) 7-13
multiple-screen copy 3-11
mUltiple-screen viewing 3-10
multi workstations 4-2

N
Netview 13-1
Network Asset Management 7-13
network control 11-1
Network Error Management Facility (NEMF)
nondisplay keying mode 2-6
nondisplayed fields 2-2
nonprotected field 9-1
nonswitched network modems 10-4
null suppression 9-3
numeric fields 9-1

13-1

o

office systems 11-2
operating systems 11-1
operator-initiated local copy 3174, 3274, and3276): 9-3

Index

X-23

Index

optional keypad 5-5
optional system components
3299 Terminal Multiplexer 8-1
3814 Switching Management System
5209 Link Protocol Converter 8-4
other licensed programs 11-3

protected data image format
protected field 9-1
8-3

ppersonal computing 2-3
plasma panel 3-10
printers
Asynchronous Emulation Adapter 7-3
characteristics 6-2
description 6-1
general information 1-1
Intelligent Printer Data Stream (IPDS) 7-9
printout 1-1
3270 family 6-1
3812 Model 2 6-24224 Model 1 6-34234 Model OOt 6-44234 Model 002 6-44245 Model 012 6-54245 Model 020 6-54250 6-6
5210 Model G01 6-7
5210 Model G02 6-7
6262 Model 012 6-86262 Model 014 6-8
problem determination
description 13-1
Display Exception Monitoring Facility (DEMF) 13-1
Facility Error Recognition System (FERS) 13-1
general information 1-5
Netview 13-1
Network Error Management Facility (NEMF) 13-1
process monitoring and control 2-4
program development 2-3
Program Tab 9-3
programmed symbols 1-3, 1-4
definition 2-5storing character sets 2-5storing fonts 2-5
programming support
cross-industry licensed programs 11-2
data base data communication systems 11-3
development center 11-2
general information 1-5
information center 11-2
interactive programming support 11-3
network control 11-1
office systems 11-2
operati ng systems 11-1
other licensed programs 11-3
telecommunication access methods 11-1
3270 Information Display System 11-1

X-24

IBM 3270 Information Display System Introduction

9-4

RRead Modified command 9-4
reducing message lengths 9-3
remote attachment 10-1
remote general poll 9-4
repeat characters 9-4
Response Time Monitor 1-4
restrictions
number of emulation adapters 7-3
number of fixed disk drives 7-8

Sscheduling 2-4
SDLC protocol 9-2,10-1,10-2
security
encryption/decryption 2-6
magnetic hand scanner 2-6
magnetic slot reader 2-6
nondisplay keying mode 2-6
nondisplayed fields 2-2
security keylock 2-6
security keylock 2-6
Select 9-4
short read 9-4
simple inquiry 2-1
slot reader 2-6
switched network modems 10-4
system attachment
description 10-1
local attachment 10-1
processor support 10-2
remote attachment 10-1
System/370 10-2
S/38 10-2
S/88 10-2
308x 10-2
309x 10-24300 10-2
4361 10-2·4381 10-2
8100 10-2
system components
cluster 1-3
overview 1-1
system processor support 10-2Ttechnical data analysis 2-4
telecommunication access methods
Terminal Multiplexer, 3299 8-1
terminals, attaching 7-14

11-1

Index3191 Display Station 3-2
3192 Display Station 3-4
3193 Display Station 3-6
3194 Display Station 3-8
3270 emulation
destination menu 7-6
host attachment 7-6
keyboard 7-5
modems 7-6
operator indicator line 7-6
printer 7-5
RTM and alert 7-6
security 7-6
terminal 7-5
typeahead 7-6
3270 Information Display System
customer setup 12-1
functional control capability 9-1
installation planning 12-1
problem determination 13-1
programming support 11-1
Token-Ring Network attachment 7-113274 channel interface speeds 9-2
3290 Information Panel 2-3,3-10
3299 Terminal Multiplexer 7-15
3812 Page Printer 6-2
3814 Switching Management System 8-34224 Printer 6-3
4234 Printer 6-4
4245 Printer 6-5
4250 Printer 6-6
5209 Link Protocol Converter 8-4
5210 Printer 6-7
6262 Printer 6-8

Token-Ring Network Attachment 10-2
touch typi ng controls 5-1
Type 1 Communication Adapter 7-14
Type 2 Communication Adapter 7-14v
vector graphics 2-5
V.35 Interface 10-5w

Write command 9-4
Write Structured Field command

9-4

X
X.21 interface 10-5
X.25 adapter 10-5
X.25 protocol 10-2

Numerics
20MB Fixed Disk Drive 7-83174 channel interface speeds 9-2
3174 Information Display Systemcomponents 1-1
customer setup 1-5
general information 1-1
highlights 1-3
problem determination 1-5
programming support 1-5
3174 Subsystem Control Unit
Asynchronous Emulation Adapter 7-3
attached terminals 7-14
available features 7-1
Central Site Change Management 7-8
central site customization utility (CSCU)
description 7-1
local attachment 7-1
microcode support 7-15
Model 1L 7-19
Model1R 7-20
Model 2R 7-21
Model 3R 7-22
Model51R 7-23
Model52R 7-24
Model 53R 7-24
Model 81 R 7-25
Model 82R 7-25
models 7-2
remote attachment 7-1
SDLCaddress 7-11
system support 10-2
terminal attachments 7-14
terminal support 7-16transmission disCiplines 7-1
20MB Fixed Disk Drive 7-8

7-7

Index

X-2S

IBM 3270 Information Display System Introduction

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