> I'd suggest a balanced driver/receiver pair for each signal, RS485 driver=
 chips
> are cheap and readily available.

That was my initial thought, but he said he couldn't rewire the vehicle for=
 differential wiring.

So my suggestion would be the old standby 1488/1489 RS232 transceiver pair =
as being rugged bipolar devices that are designed to survive noisy environm=
ents. Modern ones seem to be able to handle faster than the old RS232 seria=
l speeds so I suspect would work to the 100kHz rate suggested.

However the other thought is could the data be pick-backed on a CAN system =
already existing in the vehicle? Would involve a bit of research into how m=
uch data needs to be transmitted, and breaking it up into 8 byte chunks for=
 longer messages, and how your message priorities mix and match with the st=
andard vehicle message priorities.
--=20
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