PicDude wrote :

> For example, when the the master polls each slave, if
> that slave has nothing to request, should I have it
> send back a response to the master saying that?  Or 
> do nothing and have the master wait for a timeout?

That is part of your own protocol. Do as you wish.

> At this point, I've decided that I would have it send back
> a message saying that there's nothing 
> to be done, but was curious how others addressed this issue.

I made a quick google, and found this :
http://www.hw.cz/english/docs/rs485/rs485.html
Maybe you've seen it before...

Reagrds,
Jan-Erik.



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