3
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 status of the
alarm input port. When the input signal is connected to 3.3V or it is idle, the device collects logic “1”.
When the input signal is grounded, the device collects logic “0”.
Figure 1-4
Please refer to the following figure for alarm output information. See Figure 1-5
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 the external circuit is 80mA and it is advised to add a relay if it is beyond the value.
Figure 1-5
