I think this protocol is also used in GSM phones to connect some accessories



Matthew Fries a icrit :

> Mark,
>
> I would be incredibly interested in the results that you obtain. The M-bus
> seems to be a top secret protocol that Alpine doesn't want to reveal.
> Probably for the exact reason you want to find out: So you can use a 3rd
> party device on their head unit.
>
> FWIW, I have a Stock Saturn, which uses a Delco stereo and CD-Changer.
> They also conform to the M-Bus standard. It would be nice to have a MP3
> player in the car... Maybe just something to fool the head unit into
> thinking it's got a changer on it would be enough. Good luck.
>
>  On Fri, 10 Jan 2003, Mark Perri wrote:
>
> > Does anyone have any information on the M-Bus protocol that is used by
> > Alpine in their car stereo equipment?  I checked the archives and there are
> > a couple postings from 1997-1998 that also ask about this, but I didn't
> > find any responses, also nothing on google.  I did find another M-Bus
> > (Meter-Bus) protocol, though that doesn't seem to be what I need.
> >
> > What I want to do eventually is fool the stereo into thinking there's a
> > CD-changer attached so that I can feed in music from my pic-based player
> > (it won't allow you to access the auxillary input unless it gets some kind
> > of a response from the cd-changer).
> >
> > All I know so far is that it is a one-wire type interface.  If I can't find
> > any more specific information I might try borrowing an oscilloscope from
> > work and randomly guessing commands.
> >
> > Thanks,
> > Mark
> >
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