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E-1
Appendix E
Connection to RS-422
Table E-1 describes how to connect ASM-20 (EIA 530) to a RS-422 (V.36) DTE.
Table E-1. Interface List for Connecting ASM-20 (RS- 530) to RS-422 (V.36) DTE
Signal Function RS-449 (RS-422/423)
37 Pins
EIA 530
DB-25 Female Standalone and Frame
Pin Circuit Pin Circuit
Protective Ground 1 Shield 1
Signal Ground 19 SG 7 AB
DTE Common Return 37 SC
DCE Common Return 20 RC
Transmitted Data 4 SD (A)
22 SD (B)
2 BA (A)
14 BA (B)
Received Data 6 RD (A)
24 RD (B)
3 BB (A)
16 BB (B)
Request to Send 7 RS (A)
25 RS (B)
4 CA (A)
19 CA (B)
Clear to Send 9 CS (A)
27 CS (B)
5 CB (A)
13 CB (B)
Data Set Ready 11 DM (A)
29 DM (B)
6 CC (A)
22 CC (B)
Data Terminal Ready 12 TR (A)
30 TR (B)
20 CD (A)
23 CD (A)
Carrier Detect 13 RR (A)
31 RR (B)
8 CF (A)
10 CF (B)
External Transmit Clock 17 TT (A)
35 TT (B)
24 DA (A)
11 DA (B)
Transmit Clock 5 ST (A)
23 ST (B)
15 DB (A)
12 DB (B)
Receive Clock 8 RT (A)
26 RT (B)
17 DD (A)
9 DD (B)
Local Analog Loopback 10 LL 18 LL
Remote Loopback 14 RL 21 RL
Test Indicator 18 TM 25 TM