Dahua Technology DH-IPC-HUM8441-E1-L4, Быстрый старт

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Quick Start Guide
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Figure 1-5 Alarm output
Step 3 Log in to the web page, and configure the alarm input and alarm output in alarm settings.
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The alarm input on the web page corresponds with the alarm input end of the I/O port.
There will be high level and low level alarm signals generated by the alarm input device
when an alarm occurs. Set the input mode to "NO" (default) if the alarm input signal is
logic "0" and to "NC" if the alarm input signal is logic "1".
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The alarm output on the web page corresponds with the alarm output end of the
device, which is also the alarm output end of the I/O port.