Number of required DaqTasks?

I develop a data acquisition application 16 channels using a cDaq9184 with a module 9205. So far, I have one that daqtask put in place in my .NET with a DaqComponent on the form project to set up the first string of HAVE it. Each string has its own graph of waveform on the form (form contains a control from the tab for each WFG). I need to be able to save the data of each of the channels selected by the user. All the selected channels, their data will be saved in a single file of PDM. My issue is the number of tasks that I need. For this application, should I use a single task with all channels that it contains, or should I set up an individual task for each channel individually. If you use individual tasks for each channel, it is going to be difficult or a pain to save all data channels in the single file of PDM?

Thank you

Hi DM@Means,

To solve your problem of multiple waveform graph, you need to modify the DaqTaskComponent1_DataReady event handler. Please see the following pseudocode that would represent the change you could do:

System.Threading.Monitor.Enter(DaqTask1Component1)
Dim acquiredData() As NationalInstruments.AnalogWaveform(Of Double) = e.GetData

'Plot the 0th waveform on WaveformGraph1
WaveformGraph1.PlotWaveform(acquiredData(0))
'Plot the 1st waveform on WaveformGraph2
WaveformGraph2.PlotWaveform(acquiredData(1))
'...
'Plot the (n-1)th waveform on WaveformGraphn
'WavformGraphn.PlotWaveform(acquiredData(n-1))
System.Threading.Monitor.Exit(DaqTask1Component1)

In this way, when you are given are ready, you can just draw them on the graphs that you have prepared on your UI.

Tags: NI Software

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