Using the DAQ Assistant I was able to generate a finite number of pulses, but I could not define the pulses by frequency. I could only define the pulses by inputting Low time and High time.
I think any frequency whose inverse cannot be timed precisely by the timebase, cannot be selected with the sample vi you tried to use (i.e. 5.5 Hz -> 0.18181818181818181818181818181818181818... cannot be defined by the timebase). If you take the inverse of 0.1818 (5.5005500550055001) and enter it into the Frequency control, it does work.
Randall Pursley