Dahua F Series Quick Start Manual page 9

Dahua HD IR Vandal Proof Network Dome Camera Quick Start Guide
Please refer to the following figure for alarm input information. See Figure 1-4.
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".
Please refer to the following figure for alarm output information. See Figure 1-5 and Figure 1-6.
Figure 1-4
Figure 1-5
Figure 1-6
4