I tried hooking up my Ecolink DWZWAVE2-ECO to the magnetic switches that the original home security system uses. I unplugged the alarm panel, snipped two wires, stripped them back, and wired them into the header on the board inside the z-wave sensor.
When I put it all back together, nothing happened. I then tested the ecolink z-wave sensor with just a couple pieces of wire, and they successfully trip open/closed when the circuit is open or closed accordingly.
The original panel had two switches (both doors) wired in series and connected up to a single zone on the panel. There was also a resistor wired in series on the zone side. I put a voltmeter to it, and it read about 6.5 volts. That’s weird. I thought these things were passive. Could there be enough voltage drop from the panel to two doors several tens of feet away (wired in series) that a bias was needed?
I’m at a loss for why it didn’t work when connected to the z-wave sensor. Any thoughts? Is it safe to wire the sensor in series with a +6.5 V supply on the same line so I can keep the panel functional, too?