Serioux SRX-DVR4C, Руководство пользователя

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2.1.3 Alarm input port
8chanel alarm input, the mode of alarm input is no restriction (possible is normal open also normal close);
the GND alarm detector connect to COM under parallel connection (the power of alarm detector supply by external power supply;
the ground terminal of alarm detector join-up in parallel with DVR;
the NC of alarm detector connect with the input end (alarm) of DVR;
when you want to reset the remote alarm of triggered , the +12V power supply of alarm detector supply by DVR, for example, smoke detector.
When you select the external power supply, please share the GND with DVR;
Alarm input circuit:
Alarm inlet connection: