I connect TKTDS2024 and computer through PCI IE488 card and IE488 GPIB line. And I have installed NI LabVIEW and NI-VISA 4.1. I open the VI In LabVIEW,and click on the arrow of the VISA Resource name control. It return not any instruments and their addresses. I am not sure what is the necessary conditions or configurations for the instruments return their addresses in the list of VISA Resource name control?