Nullmodem (25-25) cable

pinout

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

25 pin D-SUB female connector  to the Computer 1

D-Sub 1 D-Sub 2 Receive Data 3 2 Transmit Data Transmit Data 2 3 Receive Data Data Terminal Ready 20 6+8 Data Set Ready + Carrier Detect System Ground 7 7 System Ground Data Set Ready + Carrier Detect 6+8 20 Data Terminal Ready Request to Send 4 5 Clear to Send Clear to Send 5 4 Request to Send Note: DSR & CD are jumpered to fool the programs to think that they are online.

25 pin D-SUB female connector  to the Computer 2

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