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23-2
Configure Dial-Up Communications
Step 1: Connect and
Configure the Modems
Publication 1756-UM001E-EN-P - August 2002
A. Connect each controller to the modem using the following
Allen-Bradley cable:
A-B 1784-CAS, 25-pin male modem connector
The cable has the following wiring:
controller
(9-pin female)
DCD
1
RXD
2
TXD
3
DTR
4
COMMON
5
DSR
6
RTS
7
CTS
8
B. Configure the modems:
Configure this signal:
DSR
DCD (CD)
DTR
modem
(25-pin male)
8
3
2
20
7
6
4
5
To:
be on (high) when a modem connection exists
be on (high) whenever the modem receives the
carrier from the remote modem
hang-up when the controller changes the DTR
signal from on to off (E.g., Set DTR to normal, not
override.)
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