IC Realtime 2 Megapixel 3-9mm VF Full HD Vandal-proof IR Network Dome Camera (ICIPD2000VIR) - Manual (Page 23)

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Please refer to the following figure for alarm input information. See Figure 2-10.
Alarm input: When the input signal is idle or grounded, the device can collect the different statuses of the
alarm input port. When the input signal is connected to the 5V or is idle, the device collects the logic “1”.
When the input signal is grounded, the device collects the logic “0”.
Figure 2-10
Please refer to the following figure for alarm output information. See Figure 2-11.
Port ALARM_COM and Port ALARM_NO composes an on-off button to provide the alarm output.
If the type is NO, this button is normal open. The button becomes on when there is an alarm output.
If the type is NC, this button is normal off. The button becomes off when there is an alarm output.
Figure 2-11