> 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/powerio-r-system/en/t1.b100/feldbus-protokolle.md).

# Fieldbus protocols

## Supported fieldbus protocols

* Modbus
* Transparent Mode
* Application use (CODESYS, Node-RED, etc.)

## Switching between Modbus and Transparent Mode (T1.B100)

1. **Activate Advanced Mode**
   * Click the gear icon ("Settings") in the top right.
   * Enable "Advanced Mode".
2. **Access to new applications**
   * Open the "Applications" menu.
   * You should now see two new applications that cannot be uninstalled:
     * Modbus Mode
     * Transparent Mode
3. **Select the mode for each port**
   * Navigate to the "Serial Settings" menu.
   * Find the "Fieldbus" section.
   * Select the desired mode for each port:
     * Modbus Mode
     * Transparent Mode

<figure><img src="/files/caacacd42339bc948b76bf024b1b15300ee174a9" alt=""><figcaption></figcaption></figure>

### Important notes

* The new applications (Modbus Mode and Transparent Mode) are permanently integrated into the system and cannot be uninstalled.
* You can flexibly decide which port uses which mode.
* Transparent Mode enables the use of serial interfaces over the network, which is especially advantageous for applications in building automation and industrial control.


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