Hi Ernst
You can connect your Max devices via Homegear and Homematic Binding to Oh3
I,m running 40+ Max devices without any problems via 4 CUNX but it is also possible with a CUL.
If you run a Openhabian Image install Homegear via “Openhabian-Config”, additionally run
“apt install homegear-management homegear-adminui” then you can configure everything via Homegear AdminUI
otherwise follow the instructions on this Page,
Once you add Devices to Homegear, Homematic Binding will autodiscover new things.
Here you can find additional info
HOWTO: Reflash MAX!Cube to CUL/CUNx and use with homegar and homematic binding - #40 by hmerk
Rolli