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How to check if USB control port is broken on 33521A

Question asked by Laurens001 on Feb 5, 2015
Latest reply on Feb 6, 2015 by lhornburg
I have a 33521A, bought new.

Unable to get USB control to work - *IDN? via NI or Agilent VISA tools gives a timeout, but the instrument is found, and the USB descriptor (USB::2391::5639::MYxxxxxxxx::0::INSTR) is shown in the software.
I have tried various USB cables
Have tried installing IVI drivers etc. 
LAN control works, and the USB cable works with instruments that create a virtual COM port.
Any idea how to check USB functionality - are more drivers required? 


regards  

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