Julian Fine wrote:
> 
> Hi,
> We have just completed a pic to GSM phone using SMS (short message service)
> to send and receive information. Forget about controlling a ericsson or
> nokia or similar phone.
> First of all they use an almost impossible type of 232 the nokia uses a
> single wire for tx and rx and the protocol is a nightmare with checksums
> checking the checksums checking the checksums and timing is extremely
> critical.
> Our Millennium Control uses a simple Falcom module http://www.falcom.com or
> you could even use a Falcom Modem or a GCOM modem http://www.wasp.co.za
>  There is a punt for tjaart ) all are controlled via RS232 with very simple
Thanks, Julian, I'll slip you that twenty later ;)) If you mention that we 
are cheaper, I'll slip you a thirty...

> commands. BUT a few tricks are needed to stop them running away and sending
> a few thousand messages over a weekend HA HA.
This is the crux. One bad weekend can ruin your bank account....

> one) and two relay outputs all the inputs are programmable via SMS at to
> what signal is sent such as input 1 hi = Alarm on  input 1 low = Alarm off
> and the signals can be sent to up to 4 cellphones within 10 seconds.
If your phone happens to be on that list, but the guys doing the 
dev have forgotten all about it, then you also get a few million 
of those meaningless messages (Hi Julian!)

-- 
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