# Description

* DIN rail mounting
* Addressing via DIP switches
* Modbus RTU
* Reference potential via COM terminals: 0 volts or 24 volts possible
* Power supply 24V UC
* Modbus RTU
* Transmission format 8N1
* **Baud rates** (Autobauding) 9,600 baud, 19,200 baud, 38,400 baud, 57,600 baud

<figure><img src="/files/38bfd879144f7cc278c07073c5a719a4ab41c762" alt="" width="563"><figcaption></figcaption></figure>

<p align="center"><em>HVAC Modbus I/Os with freely usable function blocks</em></p>

<a href="https://shop.powerio.com/shop/category/hvac-automation-produkte-8" class="button primary" data-icon="shop">To the online shop</a>  <a href="/spaces/6G4WDUYxjH3a0to8hJov/pages/3c000c2e1c5802f3cddb686a7f2386cfb40367a5" class="button secondary" data-icon="book">HVAC ModbusIO2 library for CODESYS</a>


---

# Agent Instructions: 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:

```
GET https://support.powerio.com/hub/powerio-r-system/en/hvac-modbus-ios-h1.x/description.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.