In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJMonty wrote:

RS-485 and RS-422 [i]need[/i] to share a common ground - this is how they get rid of common mode noise and provide that cool noise immunity we all love.  If they don't share a common ground, then it might work... it might not.  It's a just a big crapshoot at that point.

Thanks,
PeterM

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