Dahua 52C230UNI Quick Start Manual - Page 10

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3.3 Alarm Setup

Certain devices support alarm inputs and outputs, check your specific device for alarm capability.

Refer to Figure 3-3 for alarm input configuration. The device collects that status of the alarm input port

when the input signal is idle or grounded. If the input signal is connected to the 3.3 V or it is idle then

the device receives the alarm input signal. If input signal is grounded, then no alarm input signal is

detected.

Alarm Output – Level Application

Use this alarm output configuration if the output triggers an external device by increasing the voltage.

The alarm must increase the external pull-up resistance to trigger (high level) the device. The

maximum external pull-up level is 5 V and the maximum port current is 5 mA. Once the output

increases the pull-up resistance, the alarm decreases the output voltage to the normal state (low level)

at less than 0.8 V.

Figure 3-2

Figure 3-3