Since the OP doesn't want to add new wiring he must use the truck
chassis as the return path for the current loop(s). But I guess this
would be OK?

Or perhaps there is a way to use the original RX and TX wires as a
loop that can both transmitt and receive (half duplex) at both ends?


/Ruben

> > The old fashioned way would be a 4-20ma current loop. Other than
> > power consumption, I cannot think of a simpler way.
>=20
> I've used this with PICs in several noisy places, for both digital and
> analogue remote signals
>=20
> http://www.piclist.com/techref/microchip/aout.htm
>=20
> The output current is converted back to a voltage at the distant PIC
> with a resistor. I typically use 250 or 256 ohms for ADC applications,
> depending on whether Vcc is 5V or 5.12V
>=20
> Joe

--=20
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