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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