how to control vna via agilent usb-gpib interface

hello Labviewers, I'm trying to control a vector network analyzer (at8722ES) using the agilent USB-GPIB interface 82357a and Labview 7. But the devices and the software don't communicate with each other. I've read carefully through these postings:

Re: how to control vna via agilent usb-gpib interface

Hi Simon, see this link, maybe it is helpful for you. http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101RNAME=ViewQuestionHOID=50650008007371ECategory=Instrument+Connectivity.GPIB TN