Dahua F Series Quick Start Manual - Page 10

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Dahua F Series Quick Start Manual
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1.5.1 Alarm Input Output Connection

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 idle, the device
collects the logic "1". When the input signal is grounded, the device collects the logic "0".
Figure 1-5
Figure 1-6
Figure 1-7
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