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9 to 25 Pin Adapters

The following table shows the connections inside a standard 9 pin to 25 pin adapter.

9-Pin Connector 25 Pin Connector
Pin 1 DCD Pin 8 DCD
Pin 2 RD Pin 3 RD
Pin 3 TD Pin 2 TD
Pin 4 DTR Pin 20 DTR
Pin 5 GND Pin 7 GND
Pin 6 DSR Pin 6 DSR
Pin 7 RTS Pin 4 RTS
Pin 8 CTS Pin 5 CTS
Pin 9 RI Pin 22 RI

 
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