Faster waveform generation switching between case?

[MatthewTang]

Hi,

I have a PCI 6251 and I am using this to do waveform triggering based on the input signal.

Here is my flow:

Whenever the voltage signal from the analog input is higher than a user defined threshold. the analog ouput will output a square wave of +/-1V with 20kHz. Otherwise, the same analog output should remain idle.

I wrote a VI (please see the attachment) with case structure. I used DAQ assitant as the input and output, and passed the signal between two while loop.

I am wondering if there is any better module to speed up the one I have attached?

Best,

Matthew

[mikeporter]

Don't use express VIs. They are inherently inefficient inside loops.

Mike...

[MatthewTang]

Thanks Mike!

May I know what shall I use?

Best,

Matthew

[Dennis_Knutson]

You have an entire palette for DAQmx functions and numerous examples.

Why the separate loops and what is the purpose of the delay?

[Bob_Schor]

Read this excellent White Paper.  If you need more information, go to support.ni.com and look for DAQmx in Tutorials.

Bob Schor