INTRODUCTION • General Description of Operations
DETAILED DESCRIPTION OF OPERATIONS CommWlications-line Addressing
Operation with the Multiplexer Channel • Programming Considerations Special Features Summary • START/STOP COMMUNICATIONS CAPABIliTIES • line Control
Transmit Operation (Write Command)
Receive Operation (Read Command).
Commands
Status-Byte Conditions • Sense-Byte Conditions • Start/Stop Special Features.
Terminal Control Operations
Figure
1. IBM 2703 Transmission Control • 2. Data Communications Units Attachable to the 2703 .
3. 2703-Internal Organization
4. Main Control Words (MCW-1, MCW-2) and Main
Data Words (MDW-1, MDW-2)
5. Bit Configuration of a "G" Character (Serialized)
6. line-Control Characters
7. Start/ Stop Commands • 8. Line Base Configurations.
9. Typical 2712 Configuration
5
7
11
12
14
15
19
23
23
24
24
25
28
30
35
39 Page • iv
6 • 8 • 17 • 23 • 23 • 26 • 37 • 39 CONTENTS BSC (BINARY SYNCHRONOUS COMMUNICATIONS) CAPA­ BIliTIES
Introduction to BSC General Description of BSC Operations Synchronous Operations
Binary Synchronous Commands • Fifect of Halt I/O Instruction and Zero Byte Count. APPENDIX A. OPERA TOR'S CONTROL PANEL Indicators Switches Metering APPENDIX B. COMMUNICATIONS FACIliTIES
Common-Carrier-Provided Facilities.
Privately Owned Commtmications Facilities
INDEX • 47 • 47 • 47 50 55
62
65 • 65
65
65
68
68
69
71 ILLUSTRATIONS Figure
10. Total Low-Speed lines Available by 2712 Model
Configurations
11. Operation of Two System/360 Computers over a
Communications line • 12. Code Translation of a Received Character (to
EBCDIC or ASCII-8) 13. Communications Facilities for BSC 14. MultipOint Configuration
15. Transparent Operation • 16. Operator's Panel • Page .40
.52 • 52
.55
.56
.60
.66
iii

Figure 1. IBM 2703 Transmission Control