AVer FD1020 user manual - Manual (Page 17)

11
4. I/O Configuration
a. Connect the G (GND) & DO pin to the external relay (buzzer) device.
b. Connect the G (GND) & DI pin to the external trigger device.
When no event occurs, the DO output is 5V (DO and GND are disconnected). When the camera
detects events it will trigger and external alarm, DO output is 0V (DO and GND are connected).
If you select N.O on Input sensor setting, when the switch contacts are opened, the camera input
alarm will be triggered and will execute the action user has set, for example, send a snapshot to
E-mail address.