Dahua HD IR Vandal Proof Network Dome Camera Quick Start Guide
Please refer to the following figure for alarm output information. See Figure 1-5
Alarm output: Alarm output is OC door, requiring increase of external pull-up resistor. Output signal is
high and low levels. After pull-up resistor is increased, output signal is high level by default. When
there is alarm output, output signal becomes low level.
Figure 1-5