I have a 9 hole on the board of a serial port, how do I want to know is he a rs422 or 485 or 232, I don't know what it is, what should I do?

CodePudding user response:

Look at that have hole next to the corresponding chip

CodePudding user response:

Check the serial port driver chip

CodePudding user response:

9 standard connection hole is the RS232, TX and RX, essential and other dispensable, RS485 is 2 lines, RS422 is 4 lines

CodePudding user response:

Rs232 9 hole normal usage is,

CodePudding user response:

Consultation to the supporter is the simple method.