> For the complete documentation index, see [llms.txt](https://support.powerio.com/hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.powerio.com/hub/downloads/en/codesys-hvac-downloads/hvac-knx-library.md).

# HVAC KNX Library

### Documentation

> You can find all important information about this library, including the license and full documentation, in the documentation section.

<a href="/spaces/6G4WDUYxjH3a0to8hJov/pages/cef7399caa4236f2658da69b0d626ea46a29e811" class="button secondary" data-icon="books">To the documentation</a>

### Current version

<details>

<summary>1.2.3.5 - HVACKNX - <a href="https://dl.powerio.com/downloads/powerIO-CODESYS-HVACKNX-1.2.3.5.compiled-library-v3" class="button primary" data-icon="arrow-down-to-line">Download</a></summary>

Release Date 17.01.2026

**New features and changes**

* General improvement

***

*Technical details and security for download*

<table data-header-hidden><thead><tr><th width="292.62353515625"></th><th></th></tr></thead><tbody><tr><td><i class="fa-file-contract">:file-contract:</i> SBOM (Software Bill of Materials)</td><td><a href="https://dl.powerio.com/downloads/8c1463b5-02f2-427d-bd06-9e39d42fcbff-1.2.3.5-6756b4358d52.spdx.json">Link to the SBOM (spdx)</a></td></tr><tr><td><i class="fa-certificate">:certificate:</i> Signing</td><td>Yes (more info)</td></tr><tr><td><i class="fa-abacus">:abacus:</i> Signed library hash</td><td><code>6756b4358d52</code></td></tr></tbody></table>

</details>

***

### Older versions

<details>

<summary>1.2.3.3 - HVACKNX - <a href="https://dl.powerio.com/downloads/powerIO-CODESYS-HVACKNX-1.2.3.3.compiled-library-v3">Download</a></summary>

Release Date 21.11.2025

**New features and changes**

* General improvement

***

*Technical details and security for download*

<table data-header-hidden><thead><tr><th width="292.62353515625"></th><th></th></tr></thead><tbody><tr><td><i class="fa-file-contract">:file-contract:</i> SBOM (Software Bill of Materials)</td><td><a href="https://dl.powerio.com/downloads/8c1463b5-02f2-427d-bd06-9e39d42fcbff-1.2.3.3-b79c15aa54a2.spdx.json">Link to the SBOM (spdx)</a></td></tr><tr><td><i class="fa-certificate">:certificate:</i> Signing</td><td>Yes (more info)</td></tr><tr><td><i class="fa-abacus">:abacus:</i> Signed library hash</td><td><code>b79c15aa54a2</code></td></tr></tbody></table>

</details>

<details>

<summary>1.2.3.2 - HVACKNX - <a href="https://dl.powerio.com/downloads/powerIO-CODESYS-3.5.17.2-HVACKNX-1.2.3.2.compiled-library">Download</a></summary>

Release Date 09.09.2025

**Bug fixes**

* DPD Fix Write Telegram

</details>

<details>

<summary>1.2.3.0 - HVACKNX - <a href="https://dl.powerio.com/downloads/powerIO-CODESYS-3.5.17.2-HVACKNX-1.2.3.0.compiled-library">Download</a></summary>

Release Date 08.07.2025

**Bug fixes**

* Bug Fix Initialization
* Adjustment of Write Telegram
* Optimization of Write Order

</details>

<details>

<summary>1.2.1.0 - HVACKNX - <a href="https://dl.powerio.com/downloads/powerIO-CODESYS-3.5.17.2-HVACKNX-1.2.1.0.compiled-library">Download</a></summary>

Release Date 14.03.2024

**Bug fixes**

* Performance Optimization

</details>

<details>

<summary>1.2.0.0 - HVACKNX - <a href="https://dl.powerio.com/downloads/powerIO-CODESYS-3.5.17.2-HVACKNX-1.2.0.0.compiled-library">Download</a></summary>

Release Date 12.07.2023

**New features and changes**

* New Read Blocks

</details>

### Demo Project

HVAC KNX Demo Project - [Download](https://dl.powerio.com/downloads/HVAC-KNX-Library-Demoproject.project)

### Details


---

# 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 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://support.powerio.com/hub/downloads/en/codesys-hvac-downloads/hvac-knx-library.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.