How ND_SCANCLK_LINE signal used in DAQmx? Is it Hold complete event?

[johnsonpm]

I has migrated an old app (using NI-6013-PCI Card) to DAQmx recently, but have some trouble in working. During startup signals are configured as given below.

Select_Signal(1, ND_PFI_2, ND_IN_CONVERT, ND_HIGH_TO_LOW);
Select_Signal(1, ND_SCANCLK_LINE, ND_SCANCLK, ND_LOW_TO_HIGH);

I did migration as given below.

//Select_Signal(1, ND_PFI_2, ND_IN_CONVERT, ND_HIGH_TO_LOW);
DAQmxExportSignal(TaskHandle, DAQmx_Val_AIConvertClock, "/Dev1/PFI2");
DAQmxSetAIConvActiveEdge (TaskHandle, DAQmx_Val_Falling);

//Select_Signal(1, ND_SCANCLK_LINE, ND_SCANCLK, ND_LOW_TO_HIGH);
DAQmxExportSignal(TaskHandle, DAQmx_Val_AIHoldCmpltEvent, "/Dev1/AIHoldComplete");
DAQmxSetExportedAIHoldCmpltEventPulsePolarity(TaskHandle, DAQmx_Val_ActiveHigh);

But my application shows the data as two samples shifted left. I suppose that the acquisition was delayed.
Am I doing the correct migration or is there any thing different in DAQmx?

From NI documentations I get confused whether ND_SCANCLK_LINE is AIHoldCmpltEvent or Sample clock. Or is it sampling clock?

[cs_BOT · Accepted solution]

Similar post

What Is the SCANCLK Signal, and How Do I Use It?

Hope this helps

[johnsonpm]

Hi Bot,

 There were some confusions in mapping the signal names and terminal names from traditional NI DAQ to DAQmx. Now I am convinced and the transitions of the signal / terminal names are correct. Some terminology changes are good as it was confusing earlier. I suspected these signal routing as the cause of the issues but later I found that some other issues causing the problems in measurement. 

I got the answer to my question.

Thank you very much

Johnson