Things to prepare:

1. Whether NC is an optional door sensor electromagnetic contact reed switch, we call it a 2-way sensor. Users need to purchase it before installation. All similar 2-way sensors are fine. Reference link: https://www.amazon.co.uk/dp/B00O9YULGQ
2. 2 x long signal control cables (5 meters).
3. Some basic wiring manual work. Basic logic:

Setting method:

1. Place the 2-way sensor on the top of the garage. When the door is fully opened, the wired electromagnetic sensor (provided by MSG100) and the 2-way sensor are in good contact.
2. Put the common wired sensor (provided by MSG100) on the bottom of the garage door. When the door is completely closed, the wired electromagnetic sensor and the wired sensor are in good contact.
3. Place the MSG100 device according to the instructions. The original "signal control cable" provided by MSG100, please connect wire 1 to the COM of the garage opener.
4. Using our long signal control cable, the NO port is connected to the opener OPEN port, and the NC port is connected to the opener CLOSE port. COM is connected to MSG100 Wire2.