Advantech DVMB-554E 2.9 H/W Monitor Alarm (CN12) ,

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2.9 H/W Monitor Alarm (CN12)
Close: Enable OBS Alarm
Open: Disable OBS Alarm
2.10 Line Out, Mic In Connector (CN3)
The Line Out is to output the audio signal to external audio device, like
speakers or headphones. The
Mic In is for the audio signal input via
microphones.