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Post# A1089595

If a Star Configuration is Unavoidable (Horsley)

Posted on: Monday, 20 May, 2024  16:46
Updated On: Monday, 20 May, 2024  16:48
Expires On: Sunday, 14 February, 2027  23:46
Reply to: (Not Shown)
The RS-485 standard has very little to say about grounding.
In other types of communication gadgets, say a 232-to-485 converter, both the local (232) part and the long-reach (485) part may have to be powered somehow, usually by a miniature monolithic DC-DC converter. Some handbooks say "use this wire for reference ground and earth the screen at one end only".
This is why RS-485 states "The use of a cable termination is normally required"..

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