How to connect hardwired sensor to alarm panel?

Obviously, we have wrote several articles about the hard-wired wiring for the sensors. Unfortunately, it seems the hard-wired connection is not straightforward, and cause headache for some people who are not familiar with hard-wired alarm systems. Since several clients were asking us to provide the wiring diagram with real products for the hardwired connection. Today we write this article with some high definition photos to explain what the hardwired connection is, how to connect the hardwired sensors to alarm system.