> 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/boomerang-3-domain-administrator-manual/admin/infrastructure/infrastructure__relay_boxes/relay-box-configuration-example.md).

# Relay box configuration example

The example below describes the Relay Box with 3 lights - green, yellow and red.

The condition with no alarms is represented by green, warnings by yellow, and limit and communication alarms by red light.

Additionally, all three lights are also used to signal relay box logic not working or no contact with the B3 server.

The relay box settings for this case are described in chapter [B3, com- and boot-error indication](/cg1018-relay-box-installation-manual/installation/config-file/practical_examples/b3-com-and-boot-error-indication.md) of [T-CG1018 Relay Box Installation Manual](https://help.boomerang3.com/cg1018-relay-box-installation-manual/).

Create the Relay Box in B3. This will create an alarm group for channel 1 of this box.

Edit the box and create alarm groups for channels 2 and 3 as follows:

1. Select channel 2.
2. A message will be displayed.

<figure><img src="/files/epJzersh8AjT43MCbIZG" alt=""><figcaption></figcaption></figure>

3. Click OK and sign.
4. Repeat the steps for channel 3.
5. The box edit form will look like this.

<figure><img src="/files/hDdUgyvCkaQP6RpuiIZ4" alt=""><figcaption></figcaption></figure>

6. Click "Save" and sign.
7. Go to Alarm Groups and define the triggers for the alarm groups created. The group for channel 1 shall have no triggers, the one for channel 2 shall be triggered by MP limit warnings and the one for channel 3 by MP limit and communication alarms.
8. All channels will be active while CCG1018 boots or fails to boot.

   Channel 3 will be active in case of no contact with the server.&#x20;


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