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MultiModemII User Guide
104
Appendix F: Cable Pinouts
RS-232 Pinouts
20 DTR
22 RI
8CD
7 GND
6 DSR
5 CTS
4 RTS
3RD
2TD
DTE DB-25
connector
DCE DB-25
connector
DTR 20
RI 22
CD 8
GND 7
DSR 6
CTS 5
RTS 4
RD 3
TD 2
Figure F-1. 25-pin to 25-pin RS-232 cable.
20 DTR
22 RI
8CD
7 GND
6 DSR
5 CTS
4 RTS
3RD
2TD
DCE DB-25
connector
DTE DB-9
connector
DTR 4
RI 9
CD 1
GND 5
DSR 6
CTS 8
RTS 7
RD 2
TD 3
Figure F-2. 9-pin to 25-pin RS-232 cable.