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Serial 9 to 25 Pin Cable Pinout -
D-Sub 1 D-Sub 2
Receive Data 3 3 Transmit Data
Transmit Data 2 2 Receive Data
Clear To Send + Data Set Ready 8 + 6 20 Data Terminal Ready
Carrier Detect + Data Terminal Ready 1 + 4
Ground 5 7 Ground

9 PIN D-SUB FEMALE 25 PIN D-SUB FEMALE