> That's what search engines are for. I plopped slotted aloha into google
and
> 10 pages of entries popped out.
>
> It's a collision detection system that forces each node to transmit on an
> agreed upon boundary with fixed message sizes. In this way collision
detection
> can be guranteed because multiple transmitters will all transmit at the
same
> time.
>
> The only question I had is how does EIA-485 transceivers guarantee reports
of
> collisions? I thought that multiple transmitters on the bus would not
guarantee
> a known state on the line.

They don't.  I hadn't heard the term "slotted aloha" before either, but this
sound pretty bogus applied to RS-485.  I also don't understand why he thinks
CAN is harder.  You need to make your own protocol layer either way.  CAN
takes care of collision detection and error handling for you while RS-485
doesn't.  A pure peer to peer network sounds much easier to do with CAN.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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