Hi, I have created a bountysource for creating a better/easyer way to interface the systemair/villavent ventilation systems. The current modbus binding is too complicated for novice/normal users. (i got it to work after a lot of help from @kjoglums)
https://community.openhab.org/t/modbus-and-system-air/6212/150
https://www.bountysource.com/issues/94662357-create-binding-from-already-made-modbus-helios-binding