Installation manual

Publication 1747-RM001G-EN-P - November 2008
SLC Communication Channels 13-49
DF1 Full-duplex
Communications
DF1 Full-duplex protocol (also referred to as DF1 point-to-point protocol) is
provided for applications where RS-232 point-to-point communication is
required. This type of protocol supports simultaneous transmissions between
two devices in both directions. You can use channel 0 as a programming port,
or as a peer-to-peer port using the MSG instruction.
In full-duplex mode, the SLC 5/03 (or higher) processor can send and receive
messages. When the processor receives messages, it acts as an end device - a
device that stops the transmission of data packets. The processor ignores the
destination and source addresses received in the data packets. However, the
processor exchanges these addresses in the reply that it transmits in response
to any command data packet that it has received.
If you use a modem with DF1 channel 0 in the full-duplex mode, it must be
capable of operating in full-duplex mode. Typically, a dial-up modem is used
for communication over telephone lines.
Configuring Channel 0 for DF1 Full-duplex
To configure an SLC 5/03, SLC 5/04 or SLC 5/05 processor channel 0 for
DF1 full-duplex, do the following using your programming software.
To bring up the Channel Configuration
interface, double-click on the Channel
Configuration icon.