Thanks for all the replies.

Not as easy I thought it would be. I have to rethink the design.
Maybe I should rephrase floating bus, or say why I need it. Actually, I
was thinking more of a isolated bus. I want to hook devices onto this
buses. It can be 2 to n..(within limits, obviously, say 32) devices. I
don't want to recalculate impedance every time I hook a device on (pull
ups and termination).
If a device wants to take control of the bus it checks if the bus is
free and then sends a preamble, consisting of a hard highs and a
floating lows. During the floating low it checks if a priority device
needs the bus, if not then start talking.
Sounded like a good idea in the beginning, now it does not :). Stored in
File 13.
I am going to use good ol' transceivers and time delays.

Quentin

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