I just moved into a house that’s really well wired (cat6, coax, wired security system) but almost nothing is terminated. There are recessed sliding window contact sensors in a few windows and I’ve located covers that hold wires for motion sensors and a control panel. But one thing has stomped me.

Both the main door to the outside as well as the garage door just have a wire sticking out of a hole from the top. My initial thought was that those must be for a recessed door sensor and that they just removed the sensor when moving (but I guess forgot about the ones in their windows), but there doesn’t seem to be a visible magnet or a recess where the magnet used to be in the doors themselves. And both of the wires don’t really move around a lot, making it feel like it would be close to impossible to hook up a recessed sensor in there.

Some photos: https://imgur.com/a/wkhPzkF

So my question is; Is it possible to detect a door open/close state with a single wire touching the wood? And if so what are those “sensors” called and is it possible to hook one up to a z-wave security system like Abode?