CNB SFM-21VF - Manual (Page 12)

◎ Audio Input/Output Connection (Reserved for network model)
- Connection with audio input/output device.
◎ Video Connection
- Connect with BNC coaxial cable.
◎ Alarm Input Connection
- Sensor Input.
Before Connecting sensors, check driving voltage and output signal type of
the sensor. Since output signal types of the sensors are divided into Open
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the sensor. Since output signal types of the sensors are divided into Open
Collector And Voltage Output type in general, the cabling must be done
properly after considering these typed.
If you want to use Alarm Input, the types of sensor must be selected in OSD
menu. The sensor types are Normal Open and Normal. If sensor type is not
selected properly, the alarm can be activated reversely.
Signal Description
IN COM+
Connect (+) cable of electric power source for Sensors to
this port as shown in the circuit above.
IN1-, IN2-, IN3-, IN4-
Connect output of sensors for each port as shown in the
circuit above.
Normal Open Output Voltage is high state when sensor is activated.
Normal Close Output Voltage is high state when sensor is not activated.