The alarm function of probe adopts common probe (for example, smoke probe and infrared probe, etc.) to output switching value, then the signal is transmitted to the host system by alarm processing module, and the video and switching value output is linked. All the DVR products in our company support normally-open and normally-closed probe.

    When the linkage alarm output device you are using is high frequency (for example, high frequency light), please expand it in cascade by relay, or the operation of alarm modules may be abnormal because of high-frequency induction.