KNX does not work anymore with my items

[Dim (Angelos)]

@BLg

I also have other devices like motion detectors (but they are no actuators). Do I have to define the corresponding GA too although they are integrated in group addreses of the actuators?

You can define a “generic” Thing without specifying a PA and list there the Channels and their corresponding GAs.

@BLg

b) I have e.g. one PA 1.1.5 which has 4 exits - but it is one device

This means that you will define 1 Thing with 4 Channels

@BLg

I would not like to have cryptical names for the things (Channel _1_1_3) - so i would prefer to add a “T” to the things compared to the group address like Licht_ArbeitszimmerT (Thing) and Licht_Arbeitszimmer (item). Is that OK?

Of course. You can use any naming convention that you want. You can also use the same name for the Channel (not Thing) as for the Item… but you may get confused if you use exactly the same.

See how <Bridge_Name>, <Thing_Name> & <Channel_Name> work below

Bridge	knx:ip:<Bridge_Name> "<Bridge_Label>" [
...
   			Thing device <Thing_Name> "<Thing_Label>" [ address="1.2.3", fetch=true, pingInterval=300, readInterval=0]
   			{
   				Type switch : <Channel_Name> "<Channel_Label>" [ ga="2/0/2" ]
   				Type switch : <Channel_Name> "<Channel_Label>" [ ga="3/0/2" ] 
   			}

In your items, it will look like this:

channel="knx:device:<Bridge_Name>:<Thing_Name>:<Channel_Name>"

This stuff within the double quotes is called the Channel UID (Unique Identifier) and it shows up in PaperUI also

@BLg

How can I delete the old KNX Binding (which was not installed by PaperUI)

If you installed it manually, remove the *.jar file from /usr/share/openhab2/addons/ and clean Cache & tmp folders
If you installed it using the /etc/openhab2/services/addons.cfg, remove the knx1 entry from the bindings = line
Remove also (after you keep a backup) the /etc/openhab2/services/knx.cfg file