Delta RMC151 - Manual (Page 557)

6 Communication
Fig. 4: Two-Wire Multi-drop RS-485 Network
6.10.3.4. RS-232 Wiring for the RMC70
This topic describes the wiring of the RS-232 serial port on the RMC75S. For details on wiring
the RS-232 Monitor Port, see the Monitor Port topic.
Connectors
Both of the 9-pin male DB connectors on the RMC7xS are used for RS-232
communications. A 9-pin female connector is required on the RMC70 end of the
connecting cable. The other end of the cable must match the master/host hardware,
which may be a 9-pin, 25-pin, RJ-11, connector block, or other connector.
Pin-Out
Pin assignments on the RS-232 9-pin connector:
Pin # RS-232 Function
1 DCD- Not used by RMC
2 RxD - Receive Data
3 TxD - Transmit Data
4 DTR - Not used by RMC
5 GND - Common
6 DSR - Not used by RMC
7 RTS - Ready to Send
8 CTS - Clear to Send
9 Not Connected
Note:
The RTS and CTS pins need only be connected if the RMC75S serial port has been configured
for Hardware Flow Control.
Cabling
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