Using the LabView Agilent PNA Series Library, I am able to query the PNA-L for start frequency and number of points for the active trace, but I can't seem to get the stop frequency. I'm sure this is simple to do, but I cannot find the correct .vi in the library to accomplish this.
there are different versions of labview drivers for the PNA. I am not sure which one you are using, but if you are using the one found on our support web site here, then there is a SENS_FREQ_STOP.vi under the DirectoryStructure\Sense folder when you unzip the driver. With this vi, you should be able to either set or query the stop frequency for the specified channel. this version of the driver was last updated in 2010 and works with LabView version 8.5. It is not supported anymore, but you are free to download and use it as is and it is open source, so you can make changes to the vi's as you need.
try it: 'SENS:FREQ:STOp 10e9',
where 10e9 = 10 GHz (Stop freq.)