The level conversion is done via a standard max232 ( or 233 - no external
caps ). There are several circuits on the web for these. What you gotta find
out is if your software needs an M-BUS or F-BUS ( diff. in speed )
connection. I got hold hold of the phone connector by junking a cheap
handsfree kit.

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Kevin Maciunas
> Sent: 17 January 2001 04:19
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Nokia 6120 cable connectors
>
>
> Tweedy Baird wrote:
> >
> > Hi Julio,
> > I think you need a 9-pin RS-232 serial connection to be able to
> > connect the PIC to the cell phone.
>
> No, the cable that Nokia sells has level conversion technology in it.  I
> own a 6150 and if you use standard RS-232 levels to the phone you'll
> turn it into a non-phone.  There aren't any cheap sources of the whacky
> connector on the bottom of the phone that I know of, other than a
> personal handsfree kit (which can be had for $US9 over here).
>
> There is some technical information I got by digging via the gnokii
> site: http://www.gnokii.org but the link there apears to be broken...
>
> Cheers
> /Kevin
>
> PS: DON'T plug the phone direct into the RS-232 port of a machine - it
> can be hazardous to your wallet unless you use an appropriate adaptor!!
>
> --
> Kevin J. Maciunas           Net: kevin@cs.adelaide.edu.au
> Dept. of Computer Science   Ph : +61 8 8303 5845
> University of Adelaide      Fax: +61 8 8303 4366
> Adelaide 5005
> SOUTH AUSTRALIA
>
> --
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>
>

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