Reading a 4 Byte value from a sensor using KNX

[george.erhan]

@joerg_asma

Just an item that is not linked to a certain binding?

Yes. Check this:

Design Pattern: Proxy Item

Edit: Updates for OH 4 Please see Design Pattern: What is a Design Pattern and How Do I Use Them for information on what a DP is and how to use them. Problem Statement Often one faces one or more of the following situations: perform additional logic before sending a command to a device (e.g. make sure the device can safely receive the command) send a command to multiple devices based on a single event and Groups, the follow profile, or linking multiple Channels to one Item is not feasible t…

But in your case a mere JSTransform should work, like in the docs:

Transformations

using something like:
https://www.openhab.org/addons/transformations/javascript/