Dahua N53AF5Z, Quick Installation Manual

Page: 14 / 25

3
1.3.2 Alarm Input/Output
Connect alarm input device to the alarm input end of the I/O port. Device collects different
states of alarm input port when the input signal is idling and being grounded. Device
collects logic "1" when input signal connecting to 3.3V or idling; device collects logic "0"
when input signal being grounded.
Connect alarm output device to the alarm output end of the I/O port. The alarm output is
relay switch output, which can only connect to NO alarm devices. The ALARM_OUT port
and the ALM_OUT_GND port with the same number constitute a switch for alarm output.
The switch is open normally and closes when there is alarm output.
Log in web interface, and configure alarm input and alarm output in alarm setting.

The alarm input in the web interface is corresponding to the alarm input end of the I/O
port. There will be high level and low level alarm signal generated by the alarm input
device when alarm occurs, set the input mode to NO if the signal is high level and to NC
if the signal is low level.

The alarm output in the web interface is corresponding to the alarm output end of the
device, which is also the alarm output end of the I/O port.