AVer SD1306 user manual - Manual (Page 14)

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If you select "N.C" in "Input sensor setting", when external device or circuit makes DI and GND
pin disconnected, the camera input alarm is triggered, and then camera will execute the action
user has set, for example, send snapshot to E-mail address.
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I/O Set up
Click I/O Setting from the system setup page via IE, and check “ON” on “Out1” to enable I/O
signal.