Installation and Configuration
5
Alarm Setup
Certain devices support alarm inputs and outputs, check your specific device for alarm
capability.
2.3.1 Alarm Input
Refer to the figure below for alarm input configuration. The device collects that status of the
alarm input port when the input signal is idle or grounded. If the input signal is connected to
the 3.3 V or it is idle then the device receives the alarm input signal. If input signal is grounded,
then no alarm input signal is detected.
Figure 2-4: Alarm Input Diagram
2.3.2 Alarm Output – Level Application
Use this alarm output configuration if the output triggers an external device by increasing the
voltage.
The alarm must increase the external pull-up resistance to trigger (high level) the device. The
maximum external pull-up level is 5 V and the maximum port current is 5 mA. Once the output
increases the pull-up resistance, the alarm decreases the output voltage to the normal state
(low level) at less than 0.8 V.
Figure 2-5: Alarm Output Level Application Diagram
