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The mythras speedos from Kees have a bus using an rs485 driver, but not using the rs485 protocol. In stead it uses standard serial communication over the rs485 bus. It runs at 57k6 bps and is verry easy to controle. You can select an adress on the speed controler and just hook them all up to the bus. I dont know if this is what you are looking for, but I just thought id mention it.
Hmm. Thank you, Stefan - thats certainly worth me looking at. Ill investigate.
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Fluppet
Id be interested in gaining more info about the mythras as everyone seems to be singing its praises. Any good links?
http://www.mythras.demon.nl/http://www.mythras.demon.nl/
But you wont find much information there. All I can say is that the price of a speedo is 190 euros and an interface is 60 euros. The speedos are great, the interface is suitable but not brilliant.
Standard theyll do 75A, but Kees also can tweak them up to 200A on request. They have 3 fets per leg. I know of someone who accedentally ran them at 72V for a short perriod, and they didnt blow up. If you want more info, you should probably mail Kees. He is quite busy though, so a response may take a while.