How to use the FS20 Binding with Dimmers

I am searching and trying for days now to get my FS20 Hardware running under openHAB (beginner to HomeControle-stuff).
My Switches are running, because they are the only item described in the wiki ( {fs20=“C04B00”}).

But I don’t know how to send commands like “turn on with defined dim-level”, or in/decreasing dimlevel by slider in the webinterface (slider only works 0% or 100%).
Can anybody help me please?

Best regards
Brandon Quest.