How do I acquire my data at a specific rate while continuing to monitor the data in real time?

[HelpMe9211]

The attached vi does the acquire the data properly but I also need to monitor data in real time.

Any help would be greatly appreciated.

[jyang72211]

If I understand you correctly, you want to do DAQ in a loop at a specified rate, but you want the data to display on the front panel at a slower rate.  If that's the case, you can create another loop that run at a slower rate to display your data.  You can pass the data from one loop to another through a queue.

[HelpMe9211]

Not quite sure I understand what you mean - what I'm trying to do is show realtime continuous data on the front panel without changing how the data is streamed to file. Should I put another DAQ in a loop?

[Mark_Yedinak]

No, you don't want to use another DAQ loop. Use a second loop and pass the data read from your acquire loop to the other task using a queue. If you need to read the data quickly I would also avoid updating the display in the same loop you are using to acquire the data since the UI updates may slow down your data acquisition.

[Peñata]

Hi HelpMe9211,

As Mark alluded to, having extraneous code in the same loop as your data acquisition could cause issues. It is generally a good idea to minimize the amount of code in your data acquisition loop and perform processing (display, file I/O, etc.) in other loops. This is often known as a Producer/Consumer architecture. This looks like it may be the way to go for your application. You can find the framework for the Producer/Consumer architecture by going to File»New and then browsing to VI»From Template»Frameworks»Design Patterns»Producer/Consumer Design Pattern (Data).

Hope this is helpful!

Aaron P

National Instruments

Applications Engineer

http://www.ni.com/support