> For the complete documentation index, see [llms.txt](https://docs.mclimate.eu/mclimate-lorawan-devices/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mclimate.eu/mclimate-lorawan-devices/devices/mclimate-fan-coil-thermostat-fct/mclimate-fan-coil-thermostat-device-communication-protocol/general-display-and-power-recovery/user-interface-language.md).

# User interface language

{% hint style="info" %}
This command is available for devices with firmware version ≥ 1.8.
{% endhint %}

{% tabs %}
{% tab title="SET" %}
This command is used to set the user interface language.

<table data-header-hidden><thead><tr><th width="142">Byte index</th><th>Hex value – Meaning</th></tr></thead><tbody><tr><td><strong>Byte index</strong></td><td><strong>Hex value – Meaning</strong></td></tr><tr><td>0</td><td>9A – The command code.</td></tr><tr><td>1</td><td><p>00 - English; <strong>Default</strong>.</p><p>01 - French; </p><p>02 - German; Available for devices with firmware ≥ 2.1.</p><p>03 - Spanish; Available for devices with firmware ≥ 2.1.</p></td></tr></tbody></table>

**Example command:** 0x9A01 – The server sets the user interface language French.
{% endtab %}

{% tab title="GET" %}
This command is used to get the user interface language.

<table data-header-hidden><thead><tr><th width="99.99999999999997">Byte index</th><th width="168">Sent request</th><th>Received response</th></tr></thead><tbody><tr><td><strong>Byte index</strong></td><td><strong>Sent request</strong></td><td><strong>Received response</strong></td></tr><tr><td>0</td><td>9B – Command code.</td><td>9B – The command code.</td></tr><tr><td>1</td><td></td><td><p>00 - English; </p><p>01 - French; </p><p>02 - German; </p><p>03 - Spanish;</p></td></tr></tbody></table>

**Example command:** 0x9B;

**Example response:** 0x9B01 - The user interface language is French.
{% endtab %}
{% endtabs %}


---

# Agent Instructions
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## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.mclimate.eu/mclimate-lorawan-devices/devices/mclimate-fan-coil-thermostat-fct/mclimate-fan-coil-thermostat-device-communication-protocol/general-display-and-power-recovery/user-interface-language.md?ask=<question>&goal=<endgoal>
```

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.