Dahua HD Fisheye Panorama Network Camera Quick Start Guide
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Alarm input: When the input signal is idle or grounded, the device can collect the different statuses of
the alarm input port. When the input signal is connected to 3.3V or it is idle, the device collects the
logic “1”. When the input signal is grounded, the device collects the logic “0”.
Figure 1-7
When alarm output is OC, it needs to increase pull-up resistance externally to work normally; output
signal is high and low level. After external pull-up resistance is increased, the default of output signal is
high level, and it switches to low level when there is alarm output.
The working current of alarm output port is recommended as <= 10mA. The max current which is used
to drive external circuit is 80mA, it is advised to add a relay if it is beyond the value.
