gunrunnerjohn posted:crood58 posted:I can see this industrial applications, but I would assume that 99% of the time a Arduino or Raspberry Pi would be fed off of the same power source and would not require this common ground for the RS485 bus. Making only two wires required. Technically speaking my Arduino and Raspberry Pi are sharing earth ground.
Exactly why I posted the reasons, I agree that if you have something in the same room with the same ground reference, you already have the "common ground".
* thumbs up*
