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.
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