> 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/cg1018-relay-box-installation-manual/overview.md).

# Overview

The CG1018 Relay Box is delivered as a bundle consisting of:

1. CG1018 Relay Box
2. 2m UTP Cat 5e network cable (P/N RD006/02)
3. ACM 36US24 24V, 1.5A power supply (P/N SN032)

<figure><img src="/files/i4kvvB38BUr3bsjARxQG" alt="" width="271"><figcaption><p>CG1018 Relay Box</p></figcaption></figure>

From the monitoring system point of view, the unit can work:

* for B2 and Coolguard (RQS) as a Strobelight for which only CH1 and CH2 can be used.
* for B3 as a Relay Box with all 3 channels available.

The selection of Strobelight / Relay Box is defined in [Software configuration](/cg1018-relay-box-installation-manual/installation/config-file.md). &#x20;

The setup of the Relay Box in the monitoring system can be found in: [A-B2 System Administrator Manual](https://help.boomerang3.com/boomerang-2-system-administrator-manual/) for Boomerang 2 and [A-B3 Domain Administrator Manual](https://help.boomerang3.com/boomerang-3-domain-administrator-manual/) for Boomerang 3.

In all the systems logic 0 sent to the unit indicates there is no alarm and logic 1 that an active alarm exists.

The separate sources of an alarm in the system can be logically added and they create a logic signal that controls the relay channels.&#x20;


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