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
7SE
8 DCD
20 DTR
Modem: 25-way D-type
2 TXD
3 RXD
4 CTS
5 RTS
6 DSR
7SE
8 DCD
20 DTR
TXDCTS RTSDCDDTR SE Scr RXDTXD CTS RTSDCDDTR SE232 232RXDScr
CONN2 CONN3Comms
Module
The modem signals are as follows:
TXD - control and data signals passing from Comms module to
modem.
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