Dmitry Kiryashov wrote:
>
> Hello piclisters !
>
> Badly wanted M-bus protocol description.
> This protocol is applied commonly to control
> automobile's audio systems. (Such as radio or CD)
>
> Accepted any ideas. (Url's too ;)
>
> Thank you for helping.
>
> WBR Dmitry .

Hi,
In my archives (backups) I've occasionally found few files on M-bus
(including detailed description). Not shure that is what you need,
though. They call it M-bus, low cost home electronic system. And I
beleive it's not four bit. Are there few M-buses around?
Anyway, if you need it, I will zip those files and e-mail to you.
And they do have one URL in description file -
http://fb6www.uni-paderborn.de/M-Bus/

Best wishes,
Gennady Palitsky