> But did it emulate an actual modem or just a DTMF-sender? An alarm just =
> needs to send the touch-tone frequencies as far as I can understand, =
> plus perhaps a digit or two to inform about the alarm type. Unless it's =
> going to broadcast live via an onboard  camera and microphone.
>
> The day someone writes PIC code to emulate a 300 bps or even an 1200 bps =
> bidirectonal modem, and distribute the code public domain, THEN I will =
> be impressed. ;-)

Be impressed - did it 8 years ago on an 8048 at 300 bps for a major alarm
panel manufacturer. One needs bi-directional so the alarm company can modify
parameters from their office.

Tom