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There are 4 wires on the smoke sensor, and the function of them are listed as below~ Red -> DC+12V Input Black -> GND Blue -> Relay COM. While -> Signal N/O Basically, these four wires can be connected to I/0 port 3( 105,106,201,202) of GN0116 for detecting smoke, and the pin assignment is as below~ Red -> Pin 1 Black -> Pin 3 Blue -> Pin 6 While -> Pin 8 |