Plustek 0140 Datasheet Page 64

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What is External I/O Interface?
Pin Function
1
External Sensor Input (+)
External Sensor Input receives the signal that produced by the alarm
sensor (e.g. door sensor, infrared ray sensor). Those signals can
activate the GPIO function. Please refer to EventTrigger section for
more settings.
2
GND (-)
3
External Device Control Output (-)
4 DC Power Output Terminal (+)
DC Power Output Terminal sends the electric current to activate the
external devices (e.g. light, buzzer). It is an open collector circuit and
the maximum drawing-in current is DC +12V, 100mA.
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