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Newbie question hp 70900B and labview and *IDN?

Question asked by on Jun 14, 2007
Latest reply on Jun 14, 2007 by
Just starting to program using labview using USB adapter talking to HP 70000
After getting address sorted out I am able to talk to my 70900B LO
I can change center Frequency etc.
But when I send it the *IDN? it times out and gives me an error LED.
If I send the *IDN? command to my 70205A display it returns a proper response. This means I am sending the correct syntax.
This of course is not a show stopper but I would really like to know why.
Thanks for any ideas.