1. It doesn't have to be "bulletproof" in the sense that it is 100% on and is a critical security component. It just has to be easy to use/maintain for my Grandmother (no computer monitoring, or regular maintenance). Simply needs to work (battery replacement is no problem, etc). She just wants to be able to monitor the doors opening (with a chime alert), to know if my grandfather is trying to go outside in the middle of the night.
2. Does the PS561 console chime (like the SC546A), or is it only a "Siren"? I don't want it to be deafening loud, but needs to wake her up. It will be in the same room, so doesn't need to be too loud. The chime volume on the SC546A is actually good. How does the alarm on the PS561 console sound???
3. I understand that if I use Active Home Pro/OnAlert software and the CM15A receiver, I need to leave the computer running for the door switches to trigger the SC546A Chime? Is this true - do I really need to leave the computer ON to perform this simple task? If the CM15A picks up the door switch signal OK, why can't it simply trigger the Chime on a particular address? Seems like it defeats the purpose of a security system (and is energy wasteful as well!) to need to leave the computer running at all times. Wonder why X10 decided to design the DS10A security switches to operate on a different frequency, so that they just can't be picked up like any other X10 device by a TM751 receiver, for example. They should operate and transmit a signal just like the Motion Sensors (MS13A, MS14A, MS16A). Don't understand why they don't. X10 SHOULD make a Door Switch that transmits a standard signal like the MS16A, so that it can trigger an event in a standard system, and not require the use of a PS561 security console.
4. I realize I can use the Powerflash module and hardwire the magnetic switch to it - thanks for the tip. I had thought of this before also. However, there are no convenient power receptacles anywhere near the entry doors and the installation would look kind of sloppy with all the extra wiring exposed in places. Would like to keep it neat & discrete as much as possible. Any other comments/suggestions would be appreciated. Thanks for all the responses so far.