How to take a single data point for each trigger pulse ( synchronou​s acquisitio​n).

Question

 hi
          im using the pci-mio-16E1 card, with the IDE VC++, so  im looking for an example to explicate me how to make an synchronous acquisition data using an external timing, so the idea is to acquire (take) a single data point for each trigger pulse  from one  input channel ,and saving  the data in a file .
now im making a code using the AI_setup and DAQ_op functions, im getting  a speed acquisition (it is the start of acquisition data), and  it is  a synchronous acquisition just for one trigger pulse, and me i looking for an acquisition for each trigger pulse. 
  so to  understand my problem you can see my code :
iStatus = Timeout_Config(iDevice, lTimeout);
         iRetVal = NIDAQErrorHandler(iStatus, "Timeout_Config", iIgnoreWarning);
   //  configuration and selection of  signal trigger  
         iStatus = Configure_HW_Analog_Trigger(iDevice, ND_ON, iLowValue,iHighValue, ND_ABOVE_HIGH_LEVEL, ND_THE_AI_CHANNEL);
        iRetVal = NIDAQErrorHandler(iStatus, "Configure_HW_Analog_Trigger", iIgnoreWarning);
  iStatus = Select_Signal(iDevice, ND_IN_CONVERT, ND_PFI_2,ND_HIGH_TO_LOW);
         iRetVal = NIDAQErrorHandler(iStatus, "Select_Signal", iIgnoreWarning);
    iStatus = AI_Setup(iDevice, iChannel, iGain);
   iRetVal = NIDAQErrorHandler(iStatus, "AI_Setup", iIgnoreWarning);
   while ((iReadingAvail != 1) && (iStatus == 0)) {
 /* Wait until reading is available. */
         iStatus = AI_Check(iDevice, &iReadingAvail, &iReading);
        iRetVal = NIDAQYield(iYieldON);
       //  Acquire data from a single channel 
    iStatus = DAQ_Op (iDevice, iChannel, iGain, piBuffer, ulCount, dSampRate);
   while ((iDAQstopped != 1) && (iStatus == 0)) {
        iStatus = DAQ_Check(iDevice, &iDAQstopped, &ulRetrieved);
        iRetVal = NIDAQYield(iYieldON);
       iStatus = DAQ_VScale(iDevice, iChannel, iGain, dGainAdjust, dOffset,ulCount, piBuffer, pdVoltBuffer);
      iRetVal = NIDAQErrorHandler(iStatus, "DAQ_VScale",iIgnoreWarning);
   /* Set analog trigger mode back to initial state. */
       iStatus = Configure_HW_Analog_Trigger(iDevice, ND_OFF, iLowValue,iHighValue, ND_ABOVE_HIGH_LEVEL, ND_THE_AI_CHANNEL);
  /* Set PFI line back to initial state. */
       iStatus = Select_Signal(iDevice, ND_IN_START_TRIGGER,ND_AUTOMATIC, ND_DONT_CARE);
          iStatus = DAQ_Clear(iDevice);
 /* Plot acquired data  */
      iRetVal = NIDAQPlotWaveform(pdVoltBuffer,ulCount, WFM_DATA_F64);
so this is the data acquired -0.900879,-0.900879,-0.900879,-0.900879,-0.900879,​-0.900879,-0.900879,-0.900879 and i think that is a noise because all time i get this data.
tank you very mutch fo your help

Answer 1

Hello,
Please see the responses to this thread at the following post.
http://forums.ni.com/ni/board/message?board.id=250​&message.id=13686
Also, please only post one thread per issue.
Regards,
Sean C.