Chris Cole wrote:

> On Fri, 21 Aug 1998, Jason Tuendemann wrote:
>
> > Yes but I believe that this is not a RS232 port or if it is it is not
> > standard protocol. You have to use this with software in win95 which
> > makes virtual ports and does protocol conversions.  Not much good for an
> > embedded app.
>
> What is a good cellular phone for an embedded app?

Be carefull when using a handset for embedded applications. They arenot designed for embedded
applications. Small bugs are usually not
fixed, because it is presumed that the user will switch the phone off
and back on if it goes into WIN95 mode.

Other little things can also trip you. For instance the GSM spec specifies
that if a handset loses coverage for more than three days, it must cease
its attempts to log onto a network. If you reset the phone constantly to
try and prevent this, you create nasty traffic on the network. This
logging-on type traffic takes way more overheads than other types of
network traffic (like voice, data, SMS etc). They won't like it.

I've been down this road. Besides, it may be cheaper to buy an OEM
modem with a real power supply etc than limping on with a handset.

Look at http://www.wasp.co.za/~tjaart/gcomspecs.html
I've driven this modem with 16CXXX PICs.

--
Friendly Regards

Tjaart van der Walt
mailto:tjaart@wasp.co.za

|--------------------------------------------------|
|                WASP International                |
|R&D Engineer : GSM peripheral services development|
|--------------------------------------------------|
|SMS mailto: tjaart@sms.wasp.co.za  (160 chars max)|
|     http://www.wasp.co.za/~tjaart/index.html     |
|Voice: +27-(0)11-622-8686  Fax: +27-(0)11-622-8973|
|          WGS-84 : 26¡10.52'S 28¡06.19'E          |
|--------------------------------------------------|