AVer FD1020 user manual - Manual (Page 18)

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If you select N.C in Input sensor setting, when the switch contacts are closed, the camera input
alarm will be triggered and will 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