My new (to me) house has an old Magnum Alert 1000e hardwired installation. Since Ring recently came out with this Retrofit device, and my Magnum system is set up with a number of zones that will work with the Retro, I decided to get it. Should have it tomorrow.
In the meantime I’ve set up a five piece Ring Gen 2 system, since I’ve been very happy with the Gen 1 in my other house. I started disconnecting and tagging the wires from the Magnum control box today (taking pictures before touching anything!), and here’s where I’m stumped. If I read the manual properly, Magnum is supposed to use normally closed, resistance terminated sensor contacts, with multiple contacts being wired in series for any given zone. The termination is supposed to be 2.2KOhms. I disconnected one Zone, both signal and return lines, and measured the resistance. It did not read 2.2KOhms. It read close to a dead short. I’m not certain of the exact value because I had to borrow my friend’s DMM and it kept fluttering - although when I touched the probes together the DMM read 0. My Fluke is out of reach at my other house.
So my question is - will this be a problem for the Retrofit device? I think it expects normally closed contacts, so at least that part is okay, but will it work if it looks like a short (or close to it)?
In the meantime I’ve set up a five piece Ring Gen 2 system, since I’ve been very happy with the Gen 1 in my other house. I started disconnecting and tagging the wires from the Magnum control box today (taking pictures before touching anything!), and here’s where I’m stumped. If I read the manual properly, Magnum is supposed to use normally closed, resistance terminated sensor contacts, with multiple contacts being wired in series for any given zone. The termination is supposed to be 2.2KOhms. I disconnected one Zone, both signal and return lines, and measured the resistance. It did not read 2.2KOhms. It read close to a dead short. I’m not certain of the exact value because I had to borrow my friend’s DMM and it kept fluttering - although when I touched the probes together the DMM read 0. My Fluke is out of reach at my other house.
So my question is - will this be a problem for the Retrofit device? I think it expects normally closed contacts, so at least that part is okay, but will it work if it looks like a short (or close to it)?
