The Small Symbol in the VISA Resource Name Control/Constant

Updated Mar 5, 2019

Reported In


  • LabVIEW

Issue Details

There is a small symbol next to my instrument in the VISA Resource Name control or constant list. What does this symbol mean?


This symbol (circled in red from the image above) means that there is a VISA resource that is still open with that instrument. This is typically due to the VISA resource not being closed properly or from an error within MAX as MAX keeps the VISA resource open as long as MAX is open to sustain communication to the target.  

A resource with this symbol needs to be closed before opening a new VISA resource. This is easy to implement in LabVIEW by using the VISA Close VI as below:


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