Peter C. Wallace wrote:

>[snip]
>
>As someone else posted, full duplex links avoid the timing problem altogether.
>  
>
Actually, they don't eliminate all timing problems completely.  The 
slave devices still share a single set of wires, so a misconfigured 
slave can cause some havoc.  With a single slave device, there wouldn't 
be any turnaround problems though.

Anyone looking for hardware - check out <http://www.rs485.com>.  They 
have loads of converters, repeaters, isolators, and other doodads for 
RS485.  Their stuff isn't the cheapest on the planet, but I've used 
various products of theirs for systems with up to 350 or so slaves, 
inside or outside, fixed or portable, etc.

- Steve


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