Clover CDR0430 Instruction Manual page 57

Contents
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.
Be 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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