Visa resource control loses value set during config and saved to step properties in TestStand

I'm using a Visa resource control to set the instrument handle in my VI (edit sub-step) and it gets saved into a step property of a custom step I've built at edit time. At run time the control value is intermittantly changed to "temp 0" value and I don't understand why. I have LabVIEW 7.1, TestStand 3.0

Hi kphite,
Are you using the Refnum to Session.vi and Session to Refnum.vi?
You would use the Refnum to Session.vi to convert your Visa session value to a U32. Then you can pass this back to TestStand.
Going back to LabView you use the Session to Refnum.vi to convert a U32 back to the Visa session.
Regards
Ray Farmer
Regards
Ray Farmer

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Hi.
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Solved!
Go to Solution.

Sorry for not replying to you earlier. I've been busy on other projects.
I'm not sure what you refer to with MAX, but I'm able to access the com ports using other tools/loggers. So it's not an issue with Windows 7 itself. But it seems logical that the problem would have something to do with running 32-bit drivers on a 64-bit OS. Referring to this list from NI (http://digital.ni.com/public.nsf/allkb/71E9408E6DEAD76C8625760B006B6F98), I'm downloading the 64-bit installer now.
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Turn off all devices accept for one wired LAN PC while testing.
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What browser are you using?
Try Opera or FF? If IE 8, 9, 10 or 11, set compatibility mode and test again.
Disable any security browser Add-ons like No Script and Ad-Block or configure them to allow All Pages when connected to the router.
Clear all browser caches.
Be sure to log into the Admin account on the router.
Try turning off these features in Chrome:
Top right corner, little bars for options > Settings > Settings (on left) > Show advanced settings.
Uncheck these:
Use a web service to help resolve navigation errors
Use a prediction service to help complete searches and URLs typed in the address bar
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Hello shadok,
that's strange :-)
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Attachments:
Test_Save.vi ‏12 KB

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[code]
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[/code]
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Hi Frank,
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Solved!
Go to Solution.

Turn off autoscale and set the max with a property node based on the array max of the data.
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Hello,
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Hi Team
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Visa resource control loses value set during config and saved to step properties in TestStand

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