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RS-232 Pin Configuration
Refer to this table if you want to make your own cables.
To do so, you must determine if your host RS-232 device is:
• 9-pin or 25-pin and
• configured as a DCE or DTE device.
Base/Host Port (DCE) IBM AT DB9
(DTE)
IBM XT DB25
(DTE)
Modem DB25
(DCE)
Pin / Input Signal
2 / (RD)
23 2
3 / (TD) 32 3
5 / (SG) 57 7
4 / (DTR) 420 6
6 / (DSR) 6620
7 / (RTS) 74 5
8 / (CTS) 85 4