Hi NathanT,
the IVI-Driver was delivered by Tabor Eletronics. I haven't found possiblities in the FGen VIs, too. So the solution I got just 5 minutes ago is the following:
The Waveformgenerator has a 16bit Register for Waveforms. The last two bits are reserved for the both digital channels. By sending them a 1 or a 0, one can switch them on or off. Anyway, that's a very unhandy solution, but better than no one.
I would really like to thank you for your help. If you find a better solution, please let me know.
Greetings,
Andreas