I tried all options with : and ; but nothing worked.
I also tested it via RS232 but ist didnt work either.
Visa Write (in Labview) works, as well as the other visa commands in labview.
And now the good news: Someone told to me that i have to install the "UPV-K4 Remote Control" on the Analyzer. I got a key for that but when i want to install it, an error right next to the code occurs: "deactivated (by time monitor)". I have set my time i have updated the clock and restarted the Analyer, however it still did not work.
I managed to install the K4-Option.
Now everything works.
Thank you all for your help and patience!!!