I would like to obtain a list of open visa sessions. I found this knowledge base article which should work, however when opening duplicate sessions (e.g. "COM6 (1)") the list contains empty entries or multiple COM1 references. Please try the attached vi to see the effect; on my system the visa resource name control shows COM1 & COM2 (default system ports), COM6 & COM12 (2 USB-serial converters) and LPT1 (system parallel port) at start up. This is shown after opening "COM6" (3x) > opening "COM12" (4x) > opening "COM1" (1x) > closing "COM12" and "COM12 (1)" Maybe there is a way to read the contents of the drop down menu of the VISA resource control which contains all the information and is also updated automatically. Any help is greatly appreciated, regards W@Work Note: I'm using LabVIEW 2009 (32-bit) on Windows XP

LabVIEW

Open VISA sessions (including duplicates)

Author

Hi there,

I never bothered to install SP1 on labview 2009, but this seemed a good moment to do so, this includes VISA (version 4.6.2), but still no luck.

I also looked at the Auto close setting (thanks for pointing that out), but it was already unchecked. I also tried it checked, but did not see any change.

It still bothers me that it does work on 8.5, what could be the difference? does it use a different VISA version? Do all installed labview versions use the same MAX version? (I can't find older versions on my system)

Suggestions are still welcome.

Regards, W