- RAD Data Communications Installation and Operation Manual Short Range Modem ASMi-31

Appendix C. X.21 Interface Module ASMi-31 Installation and Operation Manual
C-2 X.21 Connectors
Pin Assignment
Table C-1 shows the X.21 DB-15 pin assignment.
Table C-1 IR-X.21 DB-15 (RS-422) Connector Pin Assignment
Pin ID Function
1 Shield Chassis connection
2 A Transmit signal A
3 A Control A
4 A Receive A
5 A Indication A
6 A Signal timing A
7 A External Timing
8 GND Common
9 B Transmit B
10 B Control B
11 B Receive B
12 B Indication B
13 B Signal Timing B
14 B External Timing
15 Not connected
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