Trigger start and stop after desired number of pulses - random errors in my implementation

Dear all,

I used an example comes from here: http://zone.ni.com/devzone/cda/epd/p/id/5028

My code works, but sometimes it gives me this error:

Error -200279 occurred at Barkhausen_DAQ_raw.vi

Possible reason(s):

Attempted to read samples that are no longer available. The requested sample was previously available, but has since been overwritten.

Increasing the buffer size, reading the data more frequently, or specifying a fixed number of samples to read instead of reading all available samples might correct the problem.

Property: RelativeTo
Corresponding Value: Current Read Position
Property: Offset
Corresponding Value: 0

Task Name: _unnamedTask<37>

Does someone could give me a clue why we get this undesirable behaviour? I make my code I've seen in the official example, only I have a little higher sampling frequency...

Please find my screws attached.

Thank you!

Best regards

The example looks like it's based on this one--both have the same flaws as someone of NOR should probably correct (or simply move the example of developer to the Community area and then we users can fix it for you instead ). The issue that you are experiencing just how DAQmx uses the default settings to configure the buffer and the number of samples to read:

(1) for a finite task, DAQmx chooses a default buffer size of the ownership of samples per channel (the entrance to DAQmx Timing.vi - in your case, 20000 samples).

(2) for a task finished, by specifying - 1 for entry of number of samples per channel DAQmx Read.vi results in rereading the number of samples specified for the finished task (20000 same samples mentioned in #1).

So, you can see the problem. You constantly fill the buffer, but only to remove samples of the buffer into pieces which are the size of the buffer itself. If something happens in the software a little delaying playback of samples from the buffer, you will end up overwriting data. The buffer must be larger to compensate for (Alternatively, you can specify a number of samples to the call of DAQmx Read less than your number of configured samples for the finished task, but this seems like it would dimly to go about this).

Another major problem with the example (it would lead to a different error) is the use of the task request made to decide or not to read all of the samples. What happens if the task ends after the control has already been done and the reading is still waiting for all of the samples to be filled? You will block during the full of reading call time-out and will get a time-out error, then don't read the remaining samples in the end due to the error of chaining (or in fact I think that samples would be available on the terminal data instead - but this inconsistency seems undesirable - I don't really like blocking for 10 seconds for pending data in all cases).

There are also some minor problems with the example:

Why should I use so many samples after triggering when this will just make your acquisition performance more than necessary?
The "other samples" indicator only is not updated if there is any remaining samples, should we not update us so that it is empty rather than persist in any value has been on the indicator of the last execution of the VI?

Well, now I've got off on a tangent. The point is, in the example, there are a few flaws. I think it of a great use case for DAQmx events and would have probably done something more like this (warning, the extract is not tested - it doesn't have the makings of additional counter your example is to divide the trig source ref):

The solution to your specific problem is to configure the buffer (DAQmx Configure entry Buffer.vi). Here, I'm gone with 2 x the number of samples read by iteration of loop (should probably be enough, maybe brought to come up with an algorithm based on the sampling rate however).

Other patches are post trigger samples are now the 2 minimum (for a stop faster), DAQmx event is now used to determine the time to read all the data (to avoid the reading timeout after stopping), and the remaining data marker is always updated (to avoid stale data is displayed on the indicator in the case that there is no remaining data).

If all goes well, Miss me not else...

Best regards

Tags: NI Software

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