Bet who ever shut the system down didn't remove the AA batteries from all the detectors learned to this system,so chances are the batteries will have leaked and ruined them.
We have had to replace all the 500r/+'s on maintenance contracts thanks to scantronic,still remember getting their discontinuation letter saying that spares will be manufactured for a further three months then that was it.
Installers etc resorted to panic buying and soon stocks dwindled,pir's and door contacts were the first to drop out of circulation as all faults with the 500r were supervision related but a very good panel to boot.
Then came the Ions,great maybe the detectors will work with the 500r's,so guys got a little exited until we all read the specs,dam not the same radio freq.
Scantronic let us all down I feel :(
Anyway back to the post:
Gts has given you more info than you deserve it appears.
e manno
February 2014