Re: RS485 is bidirectional does it mean it is fullduplex?

"Paul E. Bennett" <peb@xxxxxxxxxxxxxxxxxx> wrote in message
news:d8sihj$ffk$1$830fa7a5@xxxxxxxxxxxxxxxxxxx
>
> By way of re-inforcing the point here, consider that the screen is only
> meant to act as the notional extension of a metal enclosure out along the
> wires. It should not carry any current at all (except maybe for the
> tiniest
> leakage current capacitively coupled from the signal wires - and even that
> should be miniscule). Dealing properly with the screens is a safety issue
> as well as a circuit protection and noise reduction issue.

Absolutely. Connecting to local ground at both ends of the run is a recipe
for HUGE ground currents. I've seen (very) melted ground wires. It is indeed
a safety hazard.

See my other post re isolated comms interfaces.

Steve
http://www.fivetrees.com


.

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