Applies to: All network cameras with Alarm Out port
Issue Summary:
The Alarm Output connection on modern network cameras is not a contact closure but a voltage level change.
Resolution:
The following diagram shows the circuit needed to create a relay operated closure.
An easier solution is to utilize a ready-made relay module available in many different versions similar to the ones pictured in the following images.
NOTE: Besides the relay module, a DC power-supply may be needed.