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If you select "N.O" on "Input sensor setting", when the switch contacts are opened,
the camera input alarm is triggered, and execute the action user has set, for
example, send a snapshot to E-mail address.
If you select "N.C" in "Input sensor setting", when the switch contacts are closed,
the camera input alarm is triggered, and execute the action user has set, for
example, send a snapshot to E-mail address.
c.
I/O PIN definition
GND (Ground): Initial state is LOW
DO (Digital Output): DC 5V
DI (Digital Input): Max. 50mA, DC 5V
