> For the complete documentation index, see [llms.txt](https://docs.irs.systems/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.irs.systems/ltt/documentation/ltt-gui-manual/configuration/messyconfiguration.md).

# MesSy Configuration

{% hint style="info" %}
[Click](https://github.com/irs-systems/IRS-LTT/blob/GitBook/doc/30%20User%20Documentation/.gitbook/assets/ltt_messy_config.xml) to open the MesSy configuration file **ltt\_messy\_config.xml**.
{% endhint %}

The MesSy signal configuration is where your DUT outputs and inputs are mapped to the corresponding MesSy inputs and outputs. You need to adjust this configuration depending on how your DUT's are connected to the LTT.

{% hint style="info" %}
For training or demonstration purposes you can take the default MesSy configuration and go on with your setup.
{% endhint %}

The definition of the MesSy analog inputs are important for the [signal definitions](/ltt/documentation/ltt-gui-manual/lttgui/dialogs/f3projectwizard/signalsdefinition.md) in LTT GUI's project wizard.

The file format for the MesSy signal configuration is different in MesSy V2 compared to MesSy V1. Depending on what you have selected during installation, the configuration file is for that MesSy version. If you want to switch to other MeSy versions read about [changing the MesSy version](/ltt/documentation/ltt-gui-manual/configuration/messyconfiguration/changing-messy-version.md).

You can find an example MesSy signal configuration file with all possible features and explanatory comments here:

* 50\_LTT\_SW\LTT TS\lib\IRS.MesSy\SignalConfig.Example.xml
* 50\_LTT\_SW\LTT TS\lib\IRS.MesSy\V1\SignalConfig.Example.xml


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