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File No. 8360-09
Form A22-6864-0
Systems Reference Library
IBM 2701 Data Adapter Unit
Principles of Operation
This manual provides information concerning the operation of the
IBM 2701 Data Adapter Unit. The manual is divided into three
sections.
The first section gives a general description of the 2701, includ-
ing: the terminals operating with the 2701, the functional organi-
zation of the 2701, the special features on the 2701, and various
configurations of the 2701.
The second section describes the operation of the 2701 with
the System/360. Subjects discussed here include communication
line addressing, multiplexor and selector channel operation, and
I/O instructions concerning the 2701.
The third section covers the 2701's transmission adapters. A
complete description on the operation of each adapter is made
here. This description includes transmit and receive operation
sequences, status and sense bytes, and the polling and addressing
of the terminals.
Copies of this and other IBM publications can be obtained through IBM Branch Offices.
Address comments concerning the contents of this publication to:
IBM Corporation, Product Publications, Dept. 528, Kingston, New York, 12401
Form A22-6864-0
Page Revised 7/1/65
By TNL N27-2901
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5
Functional Sections ............................ 5
Transmission Interface Converter (XIC) ......... 5
I Transmission Adapter (XA) ................... 5
Special Features ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Expansion Feature ........ . . . . . . . . . . . . . . . . . .. 5
Expanded Capability Feature .. . . . . . . . . . . . . . . .. 6
Second Channel Interface Feature . . . . . . . . . . . . .. 6
Automatic Call Feature .. . . . . . . . . . . . . . . . . . . . .. 6
2701 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7
Operational Functions . . . . . . . . . . . . . . . . . . . . . . . .. 9
Line Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9
2701- Channel Operation. . . . . . . . . . . . . . . . . . . . . .. 9
Multiplexor Channel Operation . . . . . . . . . . . . . . . .. 9
Selector Channel Operation . . . . . . . . . . . . . . . . . . .. 9
System Considerations . . . . . . . . . . . . . . . . . . . . . . . . .. 9
I/ 0 Instructions .. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10
Start I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 11
Test I/O .............................. 11
Halt I/O ........... 11
Programming Considerations . . 12
Transmisssion Adapters. . . . . . . . .. 13
Communication - Start/Stop Adapters . . . . . . . . .. 13
Programming Considerations . . . . . . . . . . . . 13
Commands ..................... 13
Adapter Operation . . . . . . . . . . . . . . . . . . . . . .. 15
Special Features . . . . . . . . . . . . . . . .. 17
Diagnostics . . . . . . . . . . . . . . . . . .. 17
Automatic Answering ......... 17
IBM Terminal Adapter - Type I .. . . . . . . 18
IBM Terminal Adapter - Type II .............. 22
IBM Terminal Adapter - Type III ............ " 23
IBM Telegraph Adapter ...................... 23.1
Telegraph Adapter - Type 1. .................. 23.1
Telegraph Adapter - Type II ................. 26
\Vorld Trade Telegraph Adapter ............. " 28
Communication - Synchronous Adapter . . . . . . . . . . .. 29
Data Acquisition and Control Adapters ............ 29.1
I Parallel Data Adapter ........................ 29.1
Contact Sense Adapter ..... . . . . . . . . . . . . . . . . .. 36
Contact Operate Adapter .. ' ........... " 38
Serial Synchronous Adapter (SSYA) ............ 42
I
IBM 2701 Data Adapter Unit
Form A22-6864-0
Page Revised 7/1/65
By TNL N27-2901
Introduction
The IBM 2701 Data Adapter Unit greatly expands the the System/360 processors. All necessary bit-byte,
input/ output capabilities of the IBM System/360 word-byte conversion, data control, and interface
( frontispiece). The 2701 provides for the connection matching is accomplished by the two functional sec-
and control of the information How of a variety of re- tions of the 2701: the transmission interface converter
mote and local external devices with an IBM System/ ( XIC) and the transmission adapter (XA).
360 (Figure 1). These devices are divided into three The XIC and XA operate as a couple which provides
types: a single complete path for the operation of the term-
COMMUNICATIONS - START/STOP inal devices with the channel (Figure 2). In a 2701
IBM 1030 Data Collection System which has more than one XIC-XA couple, the XIC is
IBM 1050 Data Communication System logically the same for each couple; the XA changes,
IBM 1060 Data Communication System according to the type of terminal devices attached.
IBM 1070 Process Communication System A minimum 2701 configuration contains one XIC-XA
AT&T 83B2/83B3 Type Selective Calling Terminals couple. With the use of special features, the 2701 can
Western Union Plan 115A Terminals have up to three more XIC-XA couples. See "2701 Con-
Common Carrier TWX Stations (8-level code) figuration" section and Figure 3.
European Teleprinters (WT attachment)
2848 Display Controls with 2260 Display Stations. Transmission Interface Converter (XIC)
2740 or 2741 (without interrupt feature) The XIC operates with the I/O interface; stores the
Communications Terminal status, sense, and command bytes; decodes the trans-
COMMUNICATIONS - SYNCHRONOUS
mission adapter I/O address; develops and checks the
IBM 1009 Data Transmission Unit parity of the data transfers with the I/O channel; re-
IBM 1013 Card Transmission Terminal
sponds to specific control unit commands; and operates
IBM 7701 Nlagnetic Tape Transmission Terminal
with the transmission adapter.
IBM 7702 Magnetic Tape Transmission Terminal
Transmission Adapter (XA)
IBM 7710 Data Communication Unit
IBM 7711 Data Communication Unit
The transmission adapter contains the circuits neces-
IBM 7740 Communication Control System
sary to perform the functions associated with a given
IBM 7750 Programmed Transmission Control
external device or class of terminal devices, such as
IBM System/360 with similarly equipped 2701's
interface control, parity decoding, character and char-
acter sequence recognition, data buffering and byte
DATA ACQUISITION AND CONTROL
conversion, and status and sense byte generation.
Parallel Data Devices
Contact Sense Terminals
Contact Operate Terminals Special Features
Serial Synchronous Terminals The special features fall into two major classifications.
The IBM 2701 can be attached to either the multi- There are some special features on the 2701 which
plexor or selector channel of the System/360. With the affect all the transmission adapters, whereas others
second channel interface feature, the 2701 can be at- are on a particular transmission adapter and affect
tached to another channel on the same processor only that adapter. Only the former will be discussed
(multiplexor or selector) or to a channel on another in this section. The special features for the transmission
processor. This means that different terminal devices adapter will be found in the following sections, in
on the 2701 can operate via the multiplexor channel or which the various transmission adapters are discussed.
the selector channel. However, once a terminal device
is assigned to a channel, it will operate only via this Expansion Feature
channel. This feature provides an additional XIC function for
the attachment of another XIC-XA couple. The only
circuitry in common with the first XIC-XA couple is
Functional Sections the power supplies and the I/O channel interface
The 2701 Data Adapter Unit provides for the on-line drivers, terminators, and receivers. This sharing of the
attachment of various input/output devices to any of interface circuitry allows additional XIC-XA couples to
Introduction 5
Form A22-6864-0
Page Revised 7/1165
By TNL N27-2901
1030
1050
1060
Communi - 1070
cations AT & T 83B2 / 83B3 **
Stort / Stop WU 115A **
Teleprinte~ **
2260
2740,2741 Data Set
Contact Sense
Data ..._ _~ System/360
Acquisition Contact Operate 2701
Direct Attachment
and Control { Parallel Data
Serial Synchronous *
1009
1013
7701
7702
7710
Synchronous '
7711
Data
7740
7750
System / 360 Model 20 Doto Set
Other System / 360 Models via 2701
* Requires Data Set
** No Data Set Required