Dahua N41C1P, User Manual, Page: 32 / 377

User's Manual
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Figure 2-99 Alarm input port (2)
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There are two alarm input types: NO/NC.
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When connect the ground port of the alarm device to the NVR, you can use any of the
GND ports ( ).
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Connect the NC port of the alarm device to the alarm input port (ALARM) of the NVR.
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When there is peripheral power supplying for the alarm device, please make sure it is
earthed with the NVR.
2.3.3 Alarm Output Port
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There is peripheral power supplying for the external alarm device.
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In case overload might result in NVR damage, please see the following relay
specifications for detailed information.
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A/B cable of the RS-485 is for the A/B cable connection of the speed PTZ.