
4101-2 Controller Installation Handbook
8-16
Connecting a Comms module to a modem at a remote site
The modem is connected to the upstream (CONN2) RS232
connections of the Comms module. Note that there is also one
connection from the modem to the downstream (CONN3) DCD
connection on the Comms module (shown in bold below). The modem
has a 25-way D-type connector.
Comms module
Modem
u/s TXD (CONN2) TXD (pin 2)
u/s RXD (CONN2) RXD (pin 3)
u/s CTS (CONN2) CTS (pin 4) - see diagram below
u/s RTS (CONN2) RTS (pin 5) - see diagram below
d/s DCD (CONN3) DSR (pin 6)
u/s SE (CONN2)
SE (pin 7)
u/s DCD (CONN2) DCD (pin 8)
u/s DTR (CONN2) DTR (pin 20)
Note: CTS and RTS should be linked together both at the modem and
at the Comms module as shown in the diagrams below.
Comms module
Connect cable screen
to Controller case
u/s TXD
u/s RXD
u/s CTS
u/s RTS
d/s DCD
u/s SE
u/s DCD
u/s DTR
Modem: 25-way D-type
2
TXD
3
RXD
4
CTS
5
RTS
6
DSR
7
SE
8
DCD
20
DTR
Modem: 25-way D-type
2
TXD
3
RXD
4
CTS
5
RTS
6
DSR
7
SE
8
DCD
20
DTR
TXD CTS RTS DCDDTR SE
Scr RXD TXD CTS RTS DCD DTR SE
232 232
RXD
Scr
CONN2
CONN3
Comms
Module
The modem signals are as follows:
TXD
- control and data signals passing from Comms module to
modem.
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