Hmmm... good thought.  I had always thought that RS485 was similar to RS232 in 
terms of being a 2-node link.  I've just checked and found it really is a bus 
structure, so I'll go do some research on it.

BTW, what do you mean by "8-pin"?  Are you referring to the interface chip 
(such as ST485)?

Cheers,
-Neil.


On Thursday 19 May 2005 02:36 pm, William Bross scribbled:
> How about using the UART and an 8 pin half duplex RS485 connection.
> Just 2 wires from room to room and one extra port pin for direction
> control.  Good to about 4K feet.  Implement a simple comm protocol and
> some addressing and you are all set.
>
> Bill


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