Thanks io_guy. I'm familiar with DCS security panels. I assume if I had one of those, I could link to the ISY through a DSC link, assuming all the wireless contacts are compatible.
Is Raspberry Pi a bit of hardware that can connect to the ADT panel and communicate through a home network like the DCS panel? I like the price. Not so sure I'm techie enough to make it work.
The RPi is a small, inexpensive, single board linux computer that many of us use for various IO tasks or as a middleman between incompatible systems. IO_Guy has written a whole series of link programs that allow these other systems to communicate with the ISY. The RPi is a low power and low cost platform to run such programs on eliminating the need for a high power PC running 24/7. It does require some moderate level techie skills but there are plenty of online resources to help you with most anything you want to accomplish with it.