sample clock rate when exporting from Matlab

[joonasmikkola]

Hi all,

I'm quite new with Labview and got stuck with (probably) some basics. I try to use a data vector generated by Matlab as an output with PCI-6115 (see the pic). I use "read from spreadsheet" VI. Everything works fine but I cannot change the sample clock rate. I wanted to use 100 000 kHz for this (binary) output but I only get 1 Hz which is some default value. The "DAQmx timing" VI which I'm using shows "uses the dt component of the waveform input to determine the sample clock rate". I find this dt inside the "DAQmx timing" but nothing happens when changing. Any help is greatly appreciated!
 

[Dennis_Knutson]

Do you see those red coercion dots on the inputs of the DAQmx Timing and DAQmx Write? They mean that you are using an incorrect data type. A 1D array has no timing information. The waveform data type includes a dt value and this is required to set the sample rate of the DAQ card. If you don't have this in the text file, you cannot automatically provide it. The Read From Spreadsheet cannot automatically create a waveform data type even if the file does contain dt information. Since you did not attach the text file you are reading, no way of knowing if your problem goes all the way back to Matlab or somewhere else.

In the future, please think about what information you should provide. As mentioned, the text file is important. It's also hard to debug an image. Attaching the actual code or a snippet is much better. A snippet is a png file that can be imported into LabVIEW as actual code. It's an option under the Edit menu in LabVIEW 2009.