Delta RMC101 - Manual (Page 493)

Serial (RS-232/422/485) 5.5
Communications 5-243
Note: The above 4-wire multi-drop RS-485 network diagram shows internal termination and
biasing on the RMC for the Tx wire pair. This is not available on RMC SERIAL hardware revision
1. Termination will have to be provided externally. Biasing will have to be provided externally or
in the host.
5.5.2.5 RS-232 Wiring for the RMC SERIAL
Connectors
The RMC SERIAL's 9-pin male DB connector is used for RS-232 communications. This requires
a 9-pin female connector on the RMC SERIAL 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.
See also General Wiring Information.
The following diagram shows the pin assignments on the RS-232 9-pin connector:
RMC Male DB9 Pin-out:
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
Cabling
A null-modem or crossover cable is typically used for RS-232 communications. See the following
wiring diagram for details.
Note: The RTS and CTS lines are only required if Hardware (RTS/CTS) flow control is selected