Piedinature - Pinouts
Nullmodem 9 to 25 Pin Cable

Use this cable between two DTE devices (for instance two computers).

9 PIN D-SUB FEMALE (To Computer 1).

25 PIN D-SUB FEMALE (To Computer 2).

9 PIN D-SUB FEMALE to Computer 1.
25 PIN D-SUB FEMALE to Computer 2.

	D-Sub 9	D-Sub 25
Receive Data	2	2	Transmit Data
Transmit Data	3	3	Receive Data
Data Terminal Ready	4	6+8	Data Set Ready + Carrier Detect
System Ground	5	7	System Ground
Data Set Ready + Carrier Detect	6+1	20	Data Terminal Ready
Request to Send	7	5	Clear to Send
Clear to Send	8	4	Request to Send

Note: DSR & CD are jumpered to fool the programs to think that they are online.

Piedinature - PinoutsNullmodem 9 to 25 Pin Cable