> I agree that other media/protocols are much more viable (serial, etc) but
> the reason for choice of RJ45 and TCP was that RJ45 sockets are already
> in situ where the devices need to go. These would easily be converted if
> it wasn't for the age old problem of an un-maintained comms cabinet!
> (a.k.a. the rats nest!).

I may very well miss something obvious here, but you are talking about RJ45
-- and RS485 for example runs well over those plugs (and Ethernet cable),
right? It also seems less work to find those connections in a comms cabinet
(if they are connected somewhere to an Ethernet hub) and connect them
appropriately than implementing Ethernet and a TCP protocol stack?

But less fun, maybe... :)

Gerhard
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