Dahua HD IR Vandal Proof Network Dome Camera Quick Start Guide
5
Connect Alarm Input/Output Port
Note
Some devices do not support alarm function, which cannot be applied to this chapter.
Step 1
Connect alarm input device to the alarm input of I/O port cable.
Input signal is idle or grounded; the device can adopt different statuses of alarm input port. Input signal
is connected to 3.3V or it is idle, the device can adopt logic
“1”; input signal is grounded, the device
can adopt logic
“0”.
Figure 2-3
Step 2
Connect alarm output device to the alarm output port of I/O port cable, alarm output is collector open
circuit output which connects 10K resistor to 3.3V externally, which is shown in Figure 2-4.
Alarm output: 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.
Figure 2-4
Step 3
Open WEB, set corresponding settings upon alarm input and output on the interface of alarm setup.
Alarm input on WEB is corresponding to the alarm input of I/O cable on device. When there is
alarm, alarm input device will generate signal of high and low level. Set corresponding NO and NC
inputs.
Set alarm output on WEB, alarm output is corresponding to alarm output end of the device, which
is the alarm output port of the I/O cable.
