Serial 9 to 25 connector.

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Following is a schematic diagram for the construction of a cable which connects a PC/AT's 9-pin serial I/O port to devices using a standard DB-25-pin connector.

AT Serial , DB-25 connector ,  name

   1 		  8  		CD

   2		  3		RxD

   3		  2		TxD

   4		 20		DTR

   5		  7		GND

   6		  6		DSR

   7		  4		RTS

   8		  5		CTS

   9		 22		RI

There's alslo a complete pinout of the PC's communication ports available. [an error occurred while processing the directive]