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Nullmodem 9 to 25 Pin Cable Pinout - AllPinouts

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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

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


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


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