I'm having problems figuring out how to connect my four wire smoke/heat detector. it is made by GE (N500 series). So, I have 3 primary smoke/co detectors made by nest that is running on a hardwired 120v. Then I have secondary smoke detectors that I ran to other part of the house such as bedrooms, hallways etc. I was reading online and I saw that many people are suggesting monitoring the power with EOL relays. Ok, so i have the 2200 ohms resistor but is the supervised relay an additional hardware I have to buy? if so, What is the major purpose of using such relay? I read where a lot of people said if one does not used supervised relay, then one will have to manually disconnect the power to the smoke detector if triggered, but if supervised one can reset it remotely, is this true. My four wire smoke detector has +ve, -ve, NO, COM. I know i'm supposed to install the 2200 ohms by the smoke detector, do i connect it to NO or COM? Could someone please shine some lights of my dilemma. Thanks