It is also depending on whether you are using the NI or Agilent GPIB controller. Read following literature for more information...
Tips on using Agilent GPIB Solutions in National Instrument’s LabVIEW Environment
我的Agilent Connection Expert如下,但在MAX和LabVIEW“已连接的仪器”下还是不能发现设备……
Have you tried enable the NI VISA Passport for Tulip?
See Page 5 Step 6 in this document...
Tips on using Agilent GPIB Solutions in National Instrument’s LabVIEW Environment
Let go back... are you using the GPIB controller from NI or Agilent?
If you are using Agilent GPIB controller, may I suggest that you re-install all necessary drivers following that document?