Specifications

Chapter 3 Wiring 19
Modem connections
PCL-741: DB-9 Male Modem (DCE)
Pin Signal Pin Signal
3 TxD 2 RxD
2 RxD 3 TxD
7 RTS 4 CTS
8 CTS 5 RTS
6 DSR 6 DTR
5 GND 7 GND
4 DTR 20 DSR
1 DCD 8 DCD
For DTE to DCE connection, use straight through cable connections,
i.e. you dont have to reverse lines 2 and 3, lines 4 and 5, and lines 6
and 20. Because in general DCE RS-232 interfaces are reversed
themselves.
Terminal without handshake
PCL-741: DB-9 MALE Terminal (DTE)
Pin Signal Pin Signal
3 TxD 3 RxD
2 RxD 2 TxD
7RTS
8 CTS
6 DSR
5 GND 7 GND
4 DTR
1 DCD