WARNING 200015 took place in Scripture DAQmx

Hello

I'm trying a sync multi function HAVE AO with USB-4431. The program works well, but when I stop the program, it gives me a warning

"When writing to memory buffer during a regeneration, the actual data generated may have alternated between the old and new data." In other words, while the pilot was replacing the old model of the buffer with the new model, the device could have generated some new data, while a part of the old data and then a part of the new data again.

"Reduce the sampling frequency, use a larger buffer or refer to the documentation on DAQmx write me for more information on other ways to avoid this warning.

My sampling rate of AI is 10000 and AO is 5000

I'm not sure what to change and where?

Can anyone enlighten me to what I would do to this warning does not occur

Kind regards

Nitin

Hi Nitin,

Try to use non-regeneration to ensure that the output data is not a mixture of old and new.

The latency will be proportional to the number of samples that have already been written that still need to be timed.  4431 has a FIFO sample 4095 that cannot be reduced.  In addition, there is a DAQmx buffer in RAM which is configurable by the user, it defaults to the number of samples in your first call to write DAQmx.  That is why the maximum latency will be:

(4095 + DAQmx_Buffer_Size) / Sample_Rate

To minimize latency, you need output 1) at a relatively fast pace minimize the effect of the FIFO onboard and 2) limit the amount of data you write per loop iteration (although make large enough so that you have no negative).

Best regards

Tags: NI Hardware

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