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N.O : Normal Open, meaning the trigger on the sensor is normally on open and will trigger if the circuit is closed. Refer to image above.
Disable : Means that this certain sensor port is not in use.
ÚBe sure to connect all sensors to the GND (Ground) port. If any of the sensors is no connected to the GND port, the sensor will not function properly. Please check if the sensor set is the same as the alarm output. If the Sensor is set to NC and alarm connected to NO, the alarm will not function properly.
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