I'd look at CAN bus as a method of doing what you want.  As was
suggested you could choose the 18F series or just glue on an MCP2510
which uses SPI bus for command and data interface.

John Dammeyer


Wireless CAN with the CANRF module now available.
http://www.autoartisans.com/products
Automation Artisans Inc.
Ph. 1 250 544 4950


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Phil
> Sent: Monday, February 24, 2003 7:44 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC}: Low speed/long distance communications
>
>
> What would you suggest for serial communications between PIC's
> (16F877/876's) that are located about 200 feet (60 meters)
> apart and on
> Cat 3 (or if I am lucky Cat 5) cable?  The data rate is slow,
> much less
> than 1,000 bps.  I have looked at I2C but it appears to be limited to
> only a few meters.  Did I miss something in the spec that allows it to
> operate at longer distances and reduced data rates?
>
> I would prefer a "daisy-chain" interconnect but if necessary a star
> topology could be implemented.
>
> Is it time for a roll-your-own interface?  Currently I am not I/O
> limited but that may change :~)
>
> Data, Clk and Vss would seem to be the easiest and minimum number of
> signals.
>
>   Your thoughts and suggestions are appreciated.
>
> Phil
>
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