>
> How about CSMA/CD?

It's not clear if the physical layer of RS-485 allows for multiple transmitters
or what happens if multiple transmitters transmit different bits.

Essentially I'm doing the multiple access part because even with ethernet there
is only a single transmitter on the channel at any point in time. This protocol
handles channel selection on a separate channel using TDM on the slot channel.
So there are no collisions because there is guranteed not to be multiple
transmitters.

I guess it would be possible to implement an ethernet type collision detector on
the second channel if RS-485 allows for multiple transmitters...

Any commentary on the UDP/SLIP part of it? The responses I've seen have been
physical layer only which isn't a relavent as the protocols on top of that
layer.

BAJ