What are the Pin outs of the 9 pin D and the pinout of the 25 pin D connector for my RS232 or RS422/485 port?

Answer

9 Pin D Serial Port Pin out25 Pin D Serial Port Pin out

RS232 Pin out
Pin Number
9 Pin D		 Pin Number
25 Pin D		 Acronym Meaning Signal Direction
w.r.t. PC
1 8 DCD Data Carrier Detect input
2 3 RXD Received data input
3 2 TXD Transmitted data output
4 20 DTR Data Terminal Ready output
5 7 GND Ground  
6 6 DSR Data Set Ready input
7 4 RTS Request To Send output
8 5 CTS Clear To Send input
9 22 RI Ring Indicator input

 

 

RS422/485 Pin out
Pin Number
9 Pin D		 Acronym Meaning Signal Direction
w.r.t. PC
1 TXD- Transmitted data (-ve) output
2 TXD+ Transmitted data (+ve) output
3 RTS- Request To Send (-ve) output
4 RTS+ Request To Send (+ve) output
5 GND Ground  
6 RXD- Received data (-ve) input
7 RXD+ Received data (+ve) input
8 CTS- Clear To Send (-ve) input
9 CTS+ Clear To Send (+ve) input

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