User's Manual

Table Of Contents
20
2.5.2 Alarm Input Port
Both NO and NC are supported.
The GND of alarm detector is in parallel connection with COM (the power supply of alarm
detector should be from external power source). See Figure 2-27.
The GND of alarm detector is in parallel connection with GND of Device.
Connect the NC port of alarm detector to the alarm input port (ALARM).
When supplying power from external power source to the alarm device, the alarm device
should be common-grounded with the Device.
Always closed alarm input illustration