# Description

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To help you get started right away, we offer the library as a download. A license can be purchased via the CODESYS Store. If you need further support, please do not hesitate to contact us.

<a href="https://app.gitbook.com/s/0iNqm20Eubny3McJVgbJ/codesys-hvac-downloads/hvac-modbus-library" class="button primary" data-icon="up-right-from-square">Download</a> <a href="https://store.codesys.com/de/hvac-building-process-automation-sl.html" class="button secondary" data-icon="seal">Purchase license</a> <a href="https://www.powerio.com/de/kontakt" class="button secondary" data-icon="question">Get support</a>

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### Overview

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<div align="left"><figure><img src="https://2592874069-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FQR4vCFzt6ixgsqlR3pdR%2Fuploads%2Fgit-blob-71b18ddd7672aa41ffa774abbe906b520de2a814%2FHVACModbus%20Modbusaktor%20Visu.PNG?alt=media" alt="" width="263"><figcaption></figcaption></figure></div>

*Use visualization elements for Modbus devices.*
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<figure><img src="https://2592874069-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FQR4vCFzt6ixgsqlR3pdR%2Fuploads%2Fgit-blob-2d7efc34c9ef10fb57a378d645132339e8d514e8%2FHVACModbus%20CFC.png?alt=media" alt=""><figcaption></figcaption></figure>

*Simple engineering by placing a master block for communication.*
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<figure><img src="https://2592874069-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FQR4vCFzt6ixgsqlR3pdR%2Fuploads%2Fgit-blob-5b3a8d5cc12efbdd28f101d2be00b21ff2195b8f%2FHVACModbusTCPMaster.png?alt=media" alt="" width="281"><figcaption></figcaption></figure>

*Modbus client with TCP support.*
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<figure><img src="https://2592874069-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FQR4vCFzt6ixgsqlR3pdR%2Fuploads%2Fgit-blob-3d7111c8d7b71daccfcf5315431384122e7eed0f%2Fimage.png?alt=media" alt=""><figcaption></figcaption></figure>

*Modbus client with serial support for Modbus RTU.*
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### Description

The library is optimized for use with the CFC editor. Slave devices are connected via a master block (serial or TCP). Slave devices can be individual Modbus queries or fully finished device blocks from many manufacturers. This simplifies commissioning.

{% hint style="success" %}
**Is a device missing in the HVAC Modbus Library?**

If you need a device that is not yet included in the HVAC Modbus Library, just contact us. After a brief internal coordination, we will be happy to expand the library for you and provide you with the corresponding device as quickly as possible.
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### Details

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