AVer SF2012H-B user manual - Manual (Page 55)

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Output Setting:
Mode setting:
OnOff Switch: Relay status is based on sensor triggered times.
Time Switch: To restore the original relay status after the interval time.
[Note]GPIO pin define please refer to the part of Front / Back plane & I/O port pin assignment.
GND
ALARM INPUT:
Normal: 3.3V (The voltage differential from ALM_IN pin & GND)
Active: 0V (Short the pin of ALM_IN and GND pin)
ALM_IN
N.O
RELAY OUTPUT:
Depends on the devices, the user should connect “N.C.” and “COM”
pins or “N.O.” and “COM” pins
COM
N.C
[Example]
RELAY INSTALLATION EXAMPLE 1
Trigger a “Normal OFF” (Normal Open) alarm siren on when event/motion occur:
RELAY INSTALLATION EXAMPLE 2
Trigger the “Normal ON” (Normal Close) indoor illumination off when event / motion occur: