DAQmxBaseReadAnalogF64 function

[JohnyM]

Hi,

I am experiencing problems with the DAQmxBaseReadAnalogF64 function for the USB-6009 acquisition card. I am working on a project to build an electrocardiogram. There is an instrumentation circuit sending heart signals to the card. Then, using Borland C++ Builder 5, I set the numSampsPerChan parameter of the DAQmxBaseReadAnalogF64 to -1 to read all the available data. I set the smapsPerChanToAcquire parameter of the DAQmxBaseSampClkTiming function to 350 samples to acquire per channel. Is there a problem with this parameter or am I missing something?

Thanks,

Jean-Gabriel Maurice

[JohnyM]

The problem I am experiencing is that the DAQmxBaseReadAnalogF64 function does indicate that it read all of the 350 acquisitions I set in the sampsPerChanToAcquire. When I display the sampsPerChanRead parameter, it indicates that only two samples were read.

Thanks,

Jean-Gabriel

[NI_USB_User]

I have the same problem with NI-USB 6008.
In addition the function DaqmxReadBinaryI16 always return an error code -200248.

[Gallus]

I had similar problems like you!
Two weeks ago I was trying to port an existing application from DAQmx to DAQmxBase. After several days of experimenting I had to give up the development.
The functions DAQmxBaseReadAnalogF64 and DAQmxBaseIsTaskDone have bugs other important functions are missing, the speed of the application is slow and the stability is insufficient.

I hope that the devices currently supported only by DAQmxBase will be supported in the next NIDAQ (DAQmx or traditional) release.

Bela Torok

[AlanArmstead]

FYI - It is being considered to port the USB-6008/9 over to NI-DAQmx in a future release of NI-DAQ.
-Alan A.

[Gallus]

> Alan A. wrote:
> FYI - It is being considered to port the USB-6008/9
> over to NI-DAQmx in a future release of NI-DAQ.

Thanks for the information!

Bela Torok

[j-mlr]

Hi,

I have the same problem with USB-6008. When I set numSampsPerChan parameter of the DAQmxBaseReadAnalogF64 to -1 to read all the available data, I get only 2 samples per channel.
Will this problem will be fixed, when 6008 is ported to NI-DAQmx? Is there any delivery date for the new release of NI-DAQmx supporting the 6008?

Jörg Müller.

[Jeremy_C]

NI-DAQmx 7.5 (link below) now supports the USB-6008 and USB-6009 devices on Windows.  I strongly recommend installing this much more powerful and robust driver.  For more information on how to switch your device to use NI-DAQmx, refer to the KB linked below.

NI-DAQmx 7.5
http://digital.ni.com/softlib.nsf/websearch/CF7ECCEA4C4CC7DE86257038004D88AE?opendocument&node=132060_US 

KB: 3NE7GJMY

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000YIRDCA4&l=en-US

[Gallus]

Thanks for your message!

> I strongly recommend installing this much more powerful and robust driver. 

> For more information on how to switch your device to use NI-DAQmx, refer to the KB linked below.

I already use NI-DAQmx 7.5. My program works without problems...

The functions DAQmxReadAnalogF64 and DAQmxIsTaskDone are working as expexted.

Regards: Bela Torok