We had a discussion on a Dutch forum about profibus (the RS485-based
version) being 2 or 3 wires, that is: does it need a
ground/reference/earth wire or not. I was convinced that it needs the 3d
wire, but reading some documentation leaves me in doubt.

Does anyone know the definitive answer? Can profibus couple devices
without a 3d wire (either in the cable or implicit in the grounding of
the various nodes)? If so, how does it cope with ground potential
differences in relation to the input range of the receiver chips?

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 
 

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