multiple cases at a time

[GerdW]

Hi jeet,

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@User002 wrote:

i still did not get answer of it

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You got answers - and a lot of questions!

Use 3 case structures in parallel when you need to handle 3 conditions in parallel…

[thols]

We are doing our best to guess what you are asking. I guess you actually don't mean "select" but "execute" or "call". The easiest is to make VIs of the code of each case and place these VIs on the block diagram. Then they will run in parallel.

[User002]

I did the same before. im using visa read and write operation in each case so im getting error if cases are running in parallel so im asking the same question 

[RHryniowski]

2 options: 

1.) Take your n Booleans and convert them into a number, for thee Booleans this is manageable but for for large numbers of permutations becomes difficult.  Cases = 2^n where n is # of Booleans.

2.) Have n separate cases, one for each Boolean.  Gets big on your code block if each case is complex.

[GerdW]

Hi jeet,

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@User002 wrote:

I did the same before. im using visa read and write operation in each case so im getting error if cases are running in parallel

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It's the first time you mention "VISA read" in this thread, so don't blame us for insufficient advice!

Why do you need to place several VISARead calls in parallel? Just create the strings/commands you want to send to your device in all those cases/ case structures, build an array of those strings and use a FOR loop to send all strings one after the other!

Why do you insist on "running in parallel" when you already learned you cannot run those VISA calls in parallel?

Why don't you attach your VI so we can inspect your code and provide better help? (This would atleast help with interpreting your question as you tend to hide important information from us…)

[JÞB]

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@paul_cardinale wrote:

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@User002 wrote:

how to select mutiple cases at time? i have some cases such as case 0 case 1 case 2. i want to select some time indusually, some time 0,1 or 0,2 or 1,2 etc or all three at t time.. is it possible? 

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You should never select anything "indusually"; that's way too cromulent.

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Actually it's not cromulent at all!

[User002]

im attaching the Vis. in that in want to select all three cases at once or 1,2 or 2,3, or 3,1 (all combinations possible). i tried to make it(cases) parallel but getting error about visa read, sometimes getting same output or not any output for all the channels. 

looking forward to help. thanks 

[santo_13]

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@User002 wrote:

im attaching the Vis. in that in want to select all three cases at once or 1,2 or 2,3, or 3,1 (all combinations possible). i tried to make it(cases) parallel but getting error about visa read, sometimes getting same output or not any output for all the channels. 

looking forward to help. thanks 

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Unfortunately, not many of us are using LV2021 or 2022 yet, please convert the VIs to LV2019

[User002]

converted to 2019..

[GerdW]

Hi jeet,

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@User002 wrote:

converted to 2019..

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Finally some code…

Suggestion:

All code, that is the same in all cases, does not belong into those cases! Move "constant code" out of the case structure! (This will reduce your cases 1,2,3 a lot…)

Then we can discuss about your other/original problem: what is the difference between those 3 cases!?

For me they look the same, even their input clusters have the same values…

• What's the point of the wait inside the "Send" event case? Events should be handled as fast as possible!
• What happens when you press "Init" (incidently) twice?
• There's no project file, and all clusters miss a typedefinition…

More suggestions:

• Do you really need upto 5 (!) input tunnels for the very same value???
• Do you really need to compare ">1.2" two times for the very same value?
• Do you really need to convert a boolean value to TRUE/FALSE in the most popular Rube-Goldberg way (IF true THEN true ELSE false)???
• Do you need to add zero?
• …