solarwind wrote:
> Then you haven't given it much thought. Both ethernet and CAN do the
> collision detection in hardware. That's rather different than doing it
> youself with RS-485, especially since some quick timing is needed.

That's the key there. I don't want to burden the CPU with too much of
the protocol details. That's why I need the simplest type of protocol.
Token bus is awesome because it guarantees that there will never be a
collision. Also, the master polling system that you have mentioned
before is also awesome. If this doesn't work out, I'm going to do it
that way.

The time slot system is also cool but I need a way to get the time
slot mechanism working and I have no idea how to do that. CSMA/CD is
cool too, but now we have to detect collisions. I think that's too
complicated for me.
------------

IMO, detecting and dealing with collisions is waaay easier than dealing with 
tokens.

I described the way it's done in J1850. What's difficult about it?

Vitaliy 

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