> 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/installation/config-file.md).

# Software configuration

The CG1018 Relay Box software configuration is defined in a **/boot/ICU/strobe\_config.ini** file stored on the SD card. 

The Relay Box can be controlled by B3, B2 and RQS (Coolguard) monitoring systems.

The easiest method that can be used when you can use SSH connection over network is to use Putty and Midnight Commander described in [T-Tools for SBC products](https://help.boomerang3.com/tools-for-sbc-products/).

If you have physical access to the unit then the file can be modified by inserting the SD card into an SD card reader of your PC and opening the file with a text editor that supports UNIX formatted text (for example Notepad++). Another option in such a case is access via Putty that can be obtained using a physical CG1018 [Serial port](/cg1018-relay-box-installation-manual/overview/serial-port.md).

When accessed with Putty use user: **pi** and password: **rasp4icu** credentials .

Start Midnight Commander.

<figure><img src="/files/1Xq6TmESB1mLJQFiXO0f" alt=""><figcaption></figcaption></figure>

The file path on the SD-card is: /boot/ICU/strobe\_config.ini.

Click '4 Edit' or press F4 key to open the file for edition.&#x20;


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