Digital acquisiton speed, it misses pulses

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Alejandro Martín 2012-8-30

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https://ww2.mathworks.cn/matlabcentral/answers/47048-digital-acquisiton-speed-it-misses-pulses

Hi everyone,

I am trying to make a very simple acquisiton program in wich I read a low frequency digital signal and plot the results. The problem I have is that the acquisition doesn't seem to be fast enough for the application, as it misses many pulses at 80 Hz approximately. I don't understand why, the frecuency is very low and with an Advantech PCI 1711 Board this should't be happening.

Here is the program

dio = digitalio ('advantech',0)
hwlines = addline(dio,2,'In')
tic
for i=1:600
   out(i)= getvalue (dio)
save('datos.txt','out')
end
tiempo=toc
stairs (out)

Thanks a lot in advance

Alejandro

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ayam mohsen 2013-4-24

what version of matlab you see to used with pci-1711u notice ,i found just matlab 2008 and 2007 can see the pci-1711u using real time window target simulink

Alejandro Martín 2013-6-3

Hi Ayam, I use a R2010a version of Matlab in a 32 bits Windows XP, and it works with PCI 1711 (note that PCI 1711U is different from PCI 1711). It also works with real time windows target. I don´t know what you are trying to do but if you let me know maybe I can help you if you are stuck in something.

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