9 to 5 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