How to read and write input voltage from usb 6008 without using daq assistant and using daqmx? My daq assistant has expired

[kdm7]

GerdW,

Now how do I add channels and thus read data from multiple channels? 

[GerdW]

Hi kdm,

did you study all those example VIs? They explain all those details…

(Use DAQmxCreateVirtualChannel and DAQmxRead.)

Did you read the DAQmxBasics offered by NI?

[kdm7]

GerdW,

Could figure it out without the examples! 

Thanks!

[kdm7]

GerdW,

Now how do you represent the data from the four channels(in 2D array data type)  in a single waveform chart.

Please help. I could not find in any examples.

[GerdW]

Hi kdm,

that is explained in the context help for a waveform chart. There it says it accepts 2D data for "multiple channel, multiple samples" data!

The same is also written in the LabVIEW help for the waveform chart!

Do you ever read the help?

[kdm7]

GerdW,

Thanks for your reply.

I connected the data(2D array) from the read function to a build array with 0,1,2,3 as constants and connected the four output arrays to a waveform chart. The waveform chart shows a zero. I then used "get waveform components" function to each array, but I think the data type is not matching. The "get waveform components" function needs waveform datatype. How do I convert? I want output all four channels in a waveform chart. How should I proceed?

I could'nt figure out from neither the Help nor the examples.

[kdm7]

 P.S : *I  bundled the four arrays and connected it to a waveform chart.

[NIquist]

Look at the example Waveform Graph Data Types for using the Waveform Graph.  If you're using a chart you'll have to transpose the 2D array or else your X and Y are reversed in the chart.  Also remember that a chart will hold your data so you'll need to clear it with a property node (the chart history) unless you want to retain your data.  It sounds like you should be using the waveform graph but I don't know what your'e trying to do.eed to use 

[kdm7]

Sorry it was not a build array that I used. It is an index array with 0,1,2,3 as constants to the index terminals. Then I connected the four output arrays to build array and this output to a waveform chart. But this waveform chart shows zero. Whats wrong?

[kdm7]

Why am I not getting it on a waveform chart? Im getting it on a waveform graph.