Thu Jan 22 09:45:06 CET 2009


The best solution is probably simple differential signalling over
CAT5.  This gives raw bit streams, so any protocol can be used (since
we want a specific protocol anyway).

It can be broken down the following way:

   - Ethernet/USB <-> EIA-485 : couples microcontroller to PC.
   - EIA-485 + power <-> TTL serial / SPI.

What I really want is probably a linux/xenomai based ARM/POWERPC
Ethernet <-> local microcontroller bus coupler.