Visa Open and Close on every iteration of loop

I have noticed that when you open the front panel of the Instrument I/O Assistant, the diagram starts with a visa session open, sets timeout property, writes, reads, parses data and ends with a visa session closed. If I were to place this into a while loop the visa session would open and close on each iteration of the loop.
Is it common practice to open and close the visa session on each iteration?

No you would not want to open and close that often. If you want to use the Instrument I/O assistant what I would do is configure it the way you want and then save it under another name so you can open the block diagram. Pull the VISA open and close outside of your loop.
Using LabVIEW 2010SP1 and TestStand 4.5

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Visa open and close with "for loops"

Hello everyone
In my program I used two "for loops" which include visa write and read for a RS32 port. it is not possible to close a devise with visa close as the out put is changed to 2D array!!! would you please help me with this error
Attachments:
ACU_232.png ‏108 KB

sam009 wrote:
Thanks for reply,
It works for "for loop" but what about "event structure loop" still is error for that.
Right-click on the output tunnel and uncheck "Use Default if Unwired". You will now be forced to wire the VISA Resource through each case.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

Is it god for the computer if you open and close it every 5 mins or less

becuase im scared of burning my computers hardware and etc in their helpp
plzz

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It's better or necessary open and close communication with instrument every loop?

I must communicate with my instrument, but I must change its value, for example temperature, every loop. See the Figure to understand:
I think that it is better if I open communication with my instrument out of while loop so I many operation: if I put Open VISA in While loop I open VISA session every loop, instead I think it is not intelligent. Can I open VISA SESSION out of the while loop or it is an error for EXCELLENT LABVIEW VI and I must open and close VISA SESSION every times I must talk (and set) with instrument? What is the better way?
Message Edited by Michelle1892773 on 02-22-2010 02:00 PM

Something like this?
I do have to say, i don't know what is happening in the false case of yours, but if nothing happens with the 100 that is wired to the shift register, once you enter the true case, the value in the shift register will always be great than "i". You might as well do what I have done then. However, if something does happen with that number in your false case, then keep it the way you have it.
That being said, why is the condition there to see if it has looped 100 times before doing the visa write??
Message Edited by for(imstuck) on 02-22-2010 04:45 PM
Message Edited by for(imstuck) on 02-22-2010 04:46 PM
CLA, LabVIEW Versions 2010-2013
Attachments:
visa.PNG ‏13 KB

How do I open and close VIs from within a VI?

Ladies and gentlemen,
I would like to use a VI to open and close other VIs based on user input. Example: The first VI will have text that reads: "Does the car have heated mirrors?" There will be two buttons: one for "YES" and the other for "NO."
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Attachments:
Q&A.vi ‏166 KB

How do I open and close vis programmatically?

I want to open and close a vi with a switch control. What is the best way to do this?

Probably the easiest way is to utilize vi server operations. Vi server will allow you to open a vi and close a vi programmatically. This is a great example that is built into LV. THis should give you some ideas. Hope this helps.
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I am trying to open a pop up vi from an event. I have been struggling with this for a while now. When i open a pop up vi and close it, the main vi stops running properly.
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What is actually happening is you hit the Ok button and your panel closes and you set the Stop 2 to True. Ok, that is fine except for the fact that the Stop 2 terminal has already been read during that iteration of the loop. So the loop will go again. This time is has read the Stop 2 at a TRUE, but the event structure needs an event before the loop can complete. But the front panel has been closed already and you are stuck.
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There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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Visa Open and Close on every iteration of loop

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