> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/external-sensors-in-incubators/k-systems/g210-invicell-standard/alarm-port.md).
# Alarm port
The alarm port is marked with number 9 on the figure below.
The external alarm port provides 3 isolated switch outputs with the maximum current rating of 1.0 A and maximum voltage of 24V AC or DC.
The switch is closed when there is no alarm and opens when alarm condition is detected.
The switch outputs are connected to pins of the XLR socket as shown below.
The alarm states can be monitored using FK002 sensors connected to the XLR female plug.
It is possible to observe all the alarms with one FK002 by connecting the outputs in series.
## B3 settings
In B3, FK002 sensor is used to observe the alarm status. Solder the FK002 cables to pins 1 and 2 of the XLR plug.
The alarm shall be raised when an opened state is detected.
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