> 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/keys-lock.md).

# Keys lock

You can decide that you want to lock some of the keys of the FCT and disable their use. Example - you may want to disable changing the fan speed.

{% tabs %}
{% tab title="SET" %}

#### You can disable one or a combination of keys with the command:

<table data-header-hidden><thead><tr><th width="138"></th><th></th></tr></thead><tbody><tr><td><strong>Byte index</strong></td><td><strong>Hex value – Meaning</strong></td></tr><tr><td>0</td><td>07 – The command code.</td></tr><tr><td>1</td><td><p>00: No keys locked.  <strong>Default value.</strong></p><p>01: Lock all keys. </p><p>02: Lock ON/OFF and mode change. </p><p>03: Lock ON/OFF. </p><p>04: Lock all keys except ON/OFF key. </p><p>05: Lock mode change.</p></td></tr></tbody></table>

**Example command**: 0x0705 – disables changing the mode through the button.
{% endtab %}

{% tab title="GET" %}

#### This command gets which keys have been disabled.

<table data-header-hidden><thead><tr><th width="131.99999999999997"></th><th width="193"></th><th></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>14 – Command code</td><td>14 – Command code.</td></tr><tr><td>1</td><td> </td><td><p>00: No keys are locked.</p><p>01: All keys are locked.</p><p>02: ON/OFF and mode change are locked. </p><p>03: ON/OFF is locked. </p><p>04: All keys except ON/OFF key are locked. </p><p>05: Mode change is locked.</p></td></tr></tbody></table>

**Example command:** 0x14.

**Example response:** 0x1405 – The mode change key is locked.
{% endtab %}
{% endtabs %}

##


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

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

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.mclimate.eu/mclimate-lorawan-devices/devices/mclimate-fan-coil-thermostat-fct/mclimate-fan-coil-thermostat-device-communication-protocol/keys-lock.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

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.