Computer Interfacing
Discussions about interfacing and electronics

RS485...Which Pair?

RS485 Device / 8-pin output jack / Need to find +/- pair. No ocil scope.


       Computer Interfacing Forum Index -> RS422 and RS485
Author Message

Jun 02, 2010 2:21 pm

Good day,
I bought a new keyboard/joystick controller for a PTZ camera. It uses RS485 for Coms. The manual fails to indicate which terminals are used. A web search discovered conflicting information.

So.... Is there a way for a guy to find the correct pair of terminals AND polarity (out of 8 possible) using just a DMM? (I don't have an Oc scope available)

Thanks in advance,

Oct 25, 2010 9:39 pm

Did you get an answer I have same problem

       Computer Interfacing Forum Index -> RS422 and RS485
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