>
>
> I'm considering a PIC to PIC link so standard TTL level signals and I've
> got 2 pairs of CAT5e to play with so the idea is to drive an optoisolator at
> each end to combat any noise issues. Data rate is not that critical -
> somewhere between 19.2k and 56k is perfectly fine.
>
> Has anyone got any experience of doing this this way ?


Think in terms of current rather than voltage, and look at what's been done
with 20mA current loop interfaces.

Still, RS-232 isn't bad over those distances, if the drivers are up to it.
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