What is the expected behavior of any Ademco keypad if you put a relay on one wire of the connection between the keypad and a 128BP panel and leave the relay disconnected? Does the keypad simply go dead, or does it display an error? If the relay is connected, how long will it take the keypad to sync up and be ready for use? Is there any potential harm to the panel itself if this relay is in use a few times a day?
The idea we had was to install such a relay to the keypad and use our door access card system as a way to activate the keypad. The user comes in and presents his badge, which connects the relay and activates the keypad for maybe five minutes. The user then can use his access code to turn the alarm system off or on.
The reason we want something like this is that the access codes have a way of becoming known over time by too wide an audience of people. Having a way to secure the keypad with both a physical token, as well as a unique user code, makes it all the harder for someone to do something trivial like just steal a code they happen to see someone use on the panel.