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Serial DE9 (RS232)

Female Male
Serial DE9 (RS232) connector pinout Serial DE9 (RS232) connector pinout
Pin Signal
1 Carrier Detect
2 Receive Data
3 Transmit Data
4 Data Terminal Ready
5 System Ground
6 Data Set Ready
7 Request To Send
8 Clear To Send
9 Ring Indicator

Shown from wiring side