AVer SF2012H-D user manual - Manual (Page 11)

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3. I/O Control Instruction
I/O terminal connector – used in application, for e.g., motion detection, event triggering, alarm
notifications. It provides the interface to:
Digital Input (GND+Alarm) : An alarm input for connecting devices that can toggle between an
open and closed circuit, for
1. GND (Ground) : Initial state is LOW
2. Alarm : Max. 50mA, DC 3.3V
Example: PIRs, door/window contacts, glass break detectors, etc. When a signal is
received the state changes and the input becomes active.
Relay output (COM +N.O.) / (COM+N.C.) : An output to Relay switch, for example: LEDs,
Sirens, etc
1. N.C. (Normally Close): Max. 1A, 24VDC or 0.5A, 125VAC
2. COM: (Common)
3. N.O. (Normally Open): Max. 1A, 24VDC or 0.5A, 125VAC
[Example]
RELAY INSTALLATION EXAMPLE 1
Trigger a “Normal OFF” (Normal Open) alarm siren on when event/motion occur:
ALARM IN
RELAY OUT