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4–14
The modem you use to interface to an Allen-Bradley RS-232-C
communication module (using half-duplex protocol) must be capable of:
supporting standard RS-232-C handshaking described in this section and
in Appendix B
supporting the baud rate of your module
operating on a multidrop link
operating in switched carrier mode under handshake control
interfacing to an asynchronous device
operating in a “transparent” mode (data is passed over the link without
being modified)
minimal RTS/CTS delay time, for optimum performance. This time is
typically determined by the time it takes the modem to turn the carrier
on.