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

"Steve at fivetrees" <steve@xxxxxxxxxxxxxxxxxxxxx> wrote:
>"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.

Bullshit.

>See my other post re isolated comms interfaces.

Why not do some real research, and find out how it is actually
done.

--
Floyd L. Davidson <http://web.newsguy.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska) floyd@xxxxxxxxxx
.

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