Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 142)

Publication AG-UM008C-EN-P - February 2005
4-4 Configuring SLC 5/03, 5/04, and 5/05 Processors
of the RS-232 modem control signals when Half-Duplex Modem
without Continuous Carrier is selected.
Radio Modems
Radio modems may be implemented in a point-to-point topology
supporting either half-duplex or full-duplex communications, or in a
point-to-multipoint topology supporting half-duplex communications
between three or more modems. In the point-to-point topology using
full-duplex radio modems, configure the SLC processors for DF1 radio
modem protocol. In the point-to-multipoint topology using
half-duplex radio modems, configure the SLC processors for DF1 radio
modem protocol. If these radio modems require RTS/CTS
handshaking, configure the control line parameter to Half-Duplex
Modem without Continuous Carrier.
Line Drivers
Line drivers, also called short-haul modems, do not actually modulate
the serial data, but rather condition the electrical signals to operate
reliably over long transmission distances (up to several miles).
Allen-Bradley’s AIC+ Advanced Interface Converter is a line driver that
converts an RS-232 electrical signal into an RS-485 electrical signal,
increasing the signal transmission distance from 50 to 4000 feet. In a
point-to-point line driver topology, configure the SLC processor for
DF1 radio modem protocol. In a point-to-multipoint line driver
topology, configure the SLC processors for DF1 half-duplex master or
slave protocol. If these line drivers require RTS/CTS handshaking,
configure the control line parameter to Half-Duplex Modem without
Continuous Carrier.