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

9 PIN D-SUB FEMALE 9 PIN D-SUB FEMALE