Reading data from digital water meter with mbus interface (Qalcosonic W1)

My parents now have the Qalcosonic W1 water meter at home.
Does anyone have any info how to retreat data from this device? The website says it has mbus, which I have not worked with so far. There is a device from Engelmann to communicate via mbus, but I have no clue how this works.

Anyone any tips or hints?