Rs-232 Modem Cable - HP J3245A Installation And Configuration Manual

Cables and Connectors
RS-232 Connector and Cable Pin-Outs

RS-232 Modem Cable

Modem
(DCE) End
25-pin male
2
3
4
5
6
7
8
20
22
23
A-8
Switch End
9-pin male Signal
3 Tx
2 Rx
7 RTS
8 CTS
6 DSR
5 GND
1 CD OR DCD
4 DTR
9 RI
DRS—typically on V.24 (European) modems
(not connected)