Recent content by norsgamn2

After working out using the multimeter, it confirmed what everyone has been suggesting -- that the system is wired "normally closed." Thanks to everyone for your assistance.

Thanks for answering. I have a multimeter, but not much experience using it. I looked at the alarm panel programming, but nothing jumped out as an answer. It uses acronyms of both "NO" and "NC" related to the zones, but nothing that clearly said whether it used "closed" or "open" circuitry.

I apologize if I'm doing this wrong but this is my first time to join in on a discussion like this, but here's my issue. I have an existing hardwired security system using the round sensors shown in this how to guide. I need to change this sensor on a sliding glass door to the external type...