On Wed, 4 Nov 1998, Dennis Plunkett wrote:

> At 10:51 4/11/98 +1100, you wrote:
> >Have been playing with this recently, primarily sending over temperature
> >alarms to GSM phones via SMS messaging.  This can be implemented at the most
> >basic level with a DS1820, PIC, 232 driver and a modem.  I've included LCD
> >for entry of nos. to send message to and temperature limits.
> >
> >Have a search for +SMS +"TAP protocol".
> >
> >Also, many pagers use this same protocol.
> >
> >Any other info required, get me off list tim@modra.com.au
> >
> >
> >Tim Modra
> >
> >-----Original Message-----
> >From:   pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU] O
n
> >Behalf Of cacciavite@bigfoot.com
> >Sent:   Tuesday, 3 November 1998 23:06
> >To:     PICLIST@MITVMA.MIT.EDU
> >Subject:        PIC & SMS GSM
> >
> >Hi PICer,
> >
> >I have been a request to send an SMS GSM when certain phisical fact happens
> >(alarms, door switch , ecc).
> >
> >This seems a perfect application for PIC, but I am now more confused about
> >the best and cheap way to comunicate to the cellular phone.
> >
> >Do you know what is the best and cheap GSM telephone suited for this kind of
> >application??
> >
> >Thanks for your suggestion.
> >
> >Ciao
> >
> >Leonardo
> >
> >
>
> The Nokia phones seem to be the best at this, however the Erricson ones are
> also nice, they have the advantage (Nokia may to) in that a turn off message
> is sent to the base when it is powered off (This is logged and can be
> obtained as part of the service from the service provider!)
>
> Also the Nokia does not require any special interfaces.
>
> Dennis
>
>
Hi,

AFAIK, Nokias *does* require special interfaces. We tried a 6110 with a
Nokia Communicator s/w. It runs only under Windoze (ugh). We logged all
the communication between PC and GSM, and all there was garbage. The
problem is, the software creates a fake comm port (e. g. COMM3) and there
is a layer between COMM3 and COMM1 (the physical port) doing a lot of
conversion.

On the other hand, we got a sample of a so-called Ericsson GSM Modem. It
is not a true modem, it is capable only voice and SMS transmitting. It can
be controlled via AT commands. However, the SMS itself is encoded also
pretty tricky...

Imre