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2.5 Digital I/O Connector Block
The I/O connector on the back of the camera provides a central interface between your
home security system and various input devices.
The two digital inputs are normally used with security sensors. They work by detecting a
change in the state of an open or closed circuit. You can check the status of the circuit in
[Setup] > [Event Setup] > [I/O Status]
The output port is normally used to trigger external audio or visual indicators, like sirens
or strobe lights.