User manual

Publication 1747-UM011F-EN-P - May 2007
204 RS-232 Communication Interface
• Full-duplex DF1 (default)
• Half-duplex DF1 (SCADA)
• DH-485
• ASCII communication
• DF1 radio modem
The SLC and PLC products detailed in this appendix that communicate
over the RS-232 communication interface also use the DF1 serial
communication protocol. DF1 protocol delimits messages, controls
message flow, detects and signals errors, and retries after errors are
detected.
SLC 5/03, SLC 5/04, and SLC
5/05 processors and RS-232
Communication
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, DF1 half-duplex master and slave
protocol, DH485 protocol, ASCII communication, and DF1 radio
modem protocol. 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)