User Manual

Specifications A-3
Publication 1784-UM519C-EN-P - September 2006
Loopback Connector Pin Assignments
The PCM2 cable assembly uses the loopback connector for its diagnostic loopback
test. The PCM5 and PCM6 cable assemblies have a loopback test but do not have a
loopback connector. In addition, the PCM4 cable assembly, used for DH485
communications, has neither a loopback connector nor a diagnostic loopback test.
The PCMS cable assembly, used for remote I/O communications, has no loopback
connector and does not do a loopback test.
1
2
3
4
5
6
7
8
TxD
RxD
TxDRet
RxDRet
RTS
CTS
RTSRet
CTSRet
PCM2 Cable Assembly
1784-PCM2