The SLC 5/03, SLC 5/04, and SLC 5/05 processors can communicate by
means of the RS-232 communication port, channel 0. Channel 0
supports DF1 full-duplex protocol and DF1 half-duplex master and
slave protocol, DH485 protocol, as well as ASCII communications.
Refer to your programming software user manual for information on
configuring the RS-232 communication port, channel 0.
The details of the DF1 protocols can be found in the DF1 Protocol and
Command Set Reference Manual, Publication Number 1770-6.5.16.
Channel 0 provides a minimum of 500V dc isolation between the I/O
signals and the logic ground of the SLC 5/03, SLC 5/04, and SLC 5/05
processors. The channel is a 9-pin D-shell. The table below provides
a description of each of the pins.
The D-shell is the bottom port on the SLC 5/03, SLC 5/04, and SLC
5/05 processors.
Pin Pin Name
1 DCD (Data Carrier Detect)
*2 RXD (Receive Data)
*3 TXD (Transmit Data)
4 DTR (Data Terminal Ready)
*5 COM (Common Return [Signal Ground])
6 DSR (Data Set Ready)
7 RTS (Request to Send)
8 CTS (Clear to Send)
9 NC (No Connection)
Look at Appendix B of this manual:
http://www.ab.com/manuals/cp/1747-um011c-en-p.pdf