Help needed:Real time generation of data

[bharath_reddy]

Hi mike,
        
   I changed it to analog output AO-voltage,And when i am running it is showing the errors like
 
         I/O type of the physical channel does not match the I/O type required by the virtual channel that you are creating
         Physical channel name                      :    Dev1/ai0
         Vitual channel name                           :    Dev1/ai0
         I/O type required for virtual channel   :    Analog output
         Task name                                         :    your task

  I  am also changed the physical channel setting from  analog input to analog output.why this error is coming?

  I can change my data in between 3.5 to -3.5 .So,i think then it is possible to get the signal.I s it true?
 Thanks,
 Bharath
        

[bharath_reddy]

Hi Mike,
             Now it is running with out errors but not able to produce the waveform .
             I am attaching the final VI and the modified data.
            Can you please figure out the  mistakes in it??
 Thanks,
 Bharath

[bharath_reddy]

Hi Mike,
         Sorry to trouble you.
         Now it is showing.
 Thanks
 Bharath
 

[MikeS81]

Hi Bharath,

no problem. What did you change?

Mike

[bharath_reddy]

Hi Mike,
   I didn't modify anything except for physical channel "I/O Name Filtering".
  
   Now this is almost working but only problem here is  gap or duration in between my waveform and it is continuous.
   Can you see it?
   I couldn't able to trace where the gap between the waveform is coming.I am attaching the VI and the data.
   What setting that we have to change to eliminate the gaps.
   Can you check it please?

Thanks,
Bharath

[Dennis_Knutson]

Since your text file does not change, there is no reason to read it over and over. You are effecitively passing a 'new' waveform to the DAQmx Write with each iteration of the while loop. You should modify the VI to match one of the shipping examples that does continuous generation. One is Cont Gen Voltage Wfm-Int Clk and another is Cont Gen Voltage Wfm-Int Clk-On-Board Regeneration.

[bharath_reddy]

HI Mike,
                 I need the data as a waveform by repitition i.e,continuous generation.
                 It is giving continuous waveform but in between my data values some time duration is coming?
                 Apart from that it is continuous.
                 Can you  tell me,which setting to be changed to eliminate the gap between my wavefrom.
                 Please check my VI to ensure?I attached it in previous post.
Thanks,
Bharath
              

[bharath_reddy]

Mike,
         when i am changing the "wat untiul next ms multiple" from '250' to some less values in the loop i am getting the more continuous waveform.The gap has been reduced a lot.
         But,when iam keeping it as '10' or less the gap is getting reduced but the waveform is not clear or overlapping is coming?
         How can i get the clear waveform.
 Thanks,
 Bharath

[MikeS81]

Hi Bharath,

try it without the "wait until ..." and use the timeout from the write vi. See the attached example. Did you look at the examples which Dennis mentioned?

Hope it helps.

Mike

Message Edited by MikeS81 on 05-07-2008 12:58 PM