HEXA HSDVR3507A, Руководство пользователя

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H.264 Network DVR
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Appendix B: Alarm Input Interface Instruction
8CH alarm input,no input model limitation(often open or often close);
The alarm detector (GND) terminal parallel with com terminal (alarm detector is supplied by external power),
The alarm detector ground terminal parallel with DVR ground terminal.
NC terminal of alarm detector connect to DVR alarm input (ALARM)
If the users want to reset the alarm which has been triggered, a detector, such as smoke detector, which supply by the +12V DVR power and
controllable is needed.
The external power should share the same ground with the DVR if the device is supply by external power.