What is the definition of RS-485 port?

I want to using V5 smart port (RS-485) to connect USB serial port. But I don’t know the pinout details(GND, A and B). I don’t have an oscilloscope or a multimeter here to check the port voltage. And I also want to know where can I find these electrical hardware standard details.

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I got it.
https://www.vexforum.com/t/smart-ports-power-wire/68061/4

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