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If you select "N.O" in "Input sensor setting", when the external device or circuit is
separated from the D/I and GND pins, the camera input alarm is triggered, and
then camera will execute the action user has set, for example, sending snapshot
to E-mail address.
If you select "N.C" in "Input sensor setting", when the external device or circuit is
in contact with the D/I and GND pins, the camera input alarm is triggered, and
then camera will execute the action the user has set, for example, sending
snapshot to E-mail address.
c. I/O PIN definition
• GND (Ground): Initial state is LOW
• D/O: Digital Output
• D/I: Digital Input
• D+ / D- : For controlling the RS-485 interface
