how to read and write simulataneously

[d_2014]

hello everyone,

I have a task to make write functions which will be use if user give command from front panel.now someone already wrote read functions and it will go on during execution.so how can i interface my program with ongoing programs.

[parthabe]

Is the read function based on some button click (= FP command), or is it a free-running read till the program (VI) is stopped? I assume the VI is based on While loop with a Stop button. If yes, then you need to just place a Case Structure inside the same While loop with its selector terminal connected to the Write button you are going to place on the FP. The True case should contain your code/SubVI for the Write logic. Try it out & post back here. And, a VI or its snapshot would help us to help you more.

Also, start looking at the Producer-Consumer & Event Structure based design patterns in LabVIEW templates.

[d_2014]

hie parthbe,

as far as read operation i am not much informed but after user click it starts getting input till and do some calculations and all.as far my part i have to do some write process whenever i got command. so i have to takecare that read process do not interupted because of my work.

[winterishere8]

The best option is to use state-machine architecture. Have you looked into it? Here is the NI KB.

Please post your VI here so I can understand better what you're trying to accomplish. 

[natasftw]

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@winterishere8 wrote:

The best option is to use state-machine architecture. Have you looked into it? Here is the NI KB.

Please post your VI here so I can understand better what you're trying to accomplish. 

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Wouldn't a state machine be a complicated way to have both things happening at once?

It sounds like he's trying to add functionality to an application that already exists without having much experience with LabVIEW.  It's unlikely he'll be able to completely re-architect the design.

[parthabe]

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@winterishere8 wrote:

The best option is to use state-machine architecture.

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From the title "how to read and write simulataneously", State Machine wont be much helpful. Maybe, you could have suggested Producer-Consumer. 🙂

[Dennis_Knutson]

First, you need to provide the type of instrument/device to know whether or not a parallel operation is even possible.

[d_2014]

hello all....

i am using ni-usb X series DAQ 6343... sorry for being late..

[Dennis_Knutson]

Then, yes you can write without disturbing the read operation. The most basic way is to simply drop a parallel while loop into the existing program. If you need some synchronization to the read, then it gets more complicated.

[d_2014]

hello all..  

         hie Dennis_knutson... as far as reading function i only know that it reads data continuously and do some processing.. so if user press some button particular write action should have take place. so plz guide me as per this requirement.. 

FOR Producer-Consumer way... should i have to change in reading functions? if anyone can provide some good and easy examples than it would be so helpful.