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How to increase ScansAvailableFcnCount when using MATLAB to control NIDAQ

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Shengjie Gao
Shengjie Gao on 7 Sep 2020
Commented: Mauro Monsalve on 17 Nov 2020 at 16:16
Hey guys,
I am currently trying to use MATLAB to control a NIDAQ (usb-6255) to collect data from my sensor. I want to do real-time plotting while collection the data.
I understand it is a good idea to use a callback function to do the plot like this
dq.ScansAvailableFcn = @(src,evt) plotDataAvailable(src, evt);
I just notice the default ScansAvailableFcnCount is set to a value that the plotting function above will be called 10 times a second (10Hz). My question is: Is there any way to increase the frequnency? I found it is easy to increase the ScansAvailableFcnCount so that the plotting function can be called less than 10Hz. However, when I decrease this value below 0.1*dq.Rate, it will say (here dq.Rate=300)
At the specified rate, the minimum count
allowed is 31.
Thank you very much!

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Answers (1)

Anmol Dhiman
Anmol Dhiman on 13 Sep 2020
Hi Shengjie,
Refer to link under Set ScansAvailableFcnCount to change the value for ScansAvailableFcnCount.
Regards,
Anmol Dhiman

  2 Comments

Shengjie Gao
Shengjie Gao on 14 Sep 2020
Hey Anmol,
Thank you for your reply. I went through the link you provided and still, as I mentioned in my original post, it looks like the maximum time that ScansAvailableFcnCount can be called in one second is 10 times (10*scan rate). Is there any way to increase this count to like 15 times a second (15*scan rate).
Thanks,
Shengjie
Mauro Monsalve
Mauro Monsalve on 17 Nov 2020 at 16:16
Hi Anmol and Shengjie,
I have the same question. Is it possible to increase that frequency or not?
Thanks,
Mauro

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