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Thread: serial comms between modules
www.piclist.com/techref/io/serials.htm?key=serial
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face BY : Michael Rigby-Jones email (remove spam text)



RS232 with a pass through connector may be ok.  Each module would have to
have a unique address of course.  The advantage here would be even low end
PICs can do async comms easily.

Failing that I think I2C would be ok.  You can put pullups in each module,
as long as the combined pullup resistance dosen't get stupidly low.  You can
trade pullup resistance for maximum bus speed to some extent, so you could
put high value pullups in the modules (to ensure a reasonable minimum value)
and run the bus slower.  The disadvantage of I2C is that you will need a PIC
with an MSSP peripheral, and you will have to think about multi-master I2C
which isn't particularly easy AFAIK.

Regards

Mike

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