What do DAQmxSetAIUsbXferReqSize(), DAQmxSetAOUsbXferReqSize() and DAQmxSetDOUsbXferReqSize() on the boards of the series M UBS?

I have a multithreaded C ++ Builder program that acquires data analog with a wire and output of analog and digital data with a second thread.  The inputs and outputs occurs in blocks of data every 0.1 seconds.

On the advice of M - and X-Series PCI and PCIe this output is smooth, but on a Board of USB-6259, admission is VERY NERVOUS waiting on every 0.3 seconds or more. This makes the use of USB M-Series cards with my program basically unacceptable.

In an attempt to reduce nervousness and smooth the input/output of data, I tried to use the DAQmx features

DAQmxSetAIUsbXferReqSize(),
DAQmxSetAOUsbXferReqSize(), and

DAQmxSetDOUsbXferReqSize()

for my USB-6259.  However, the pieces of data and therefore smooth data inputs/outputs, these functions in different values to SUPPOSIDLY decrease of entry and exit to 0.1 second is no. DIFFERENCE OBSERVABLE versus normal code without them.

My question is: these functions only designed to do something on the new X - Series USB series cards, but not the boards of the series M USB?  And is there a detailed documentation on these functions beyond C DAQmx help?

Thank you.

Bill Anderson

Hi Bill

I started looking into questions about the USB-6259 and functions of the required size. Since your post I understand you have two tasks at the same time, one is a task of entry and the other is data ouputting. If you could send me more details of your request, so I can look into this again, would be great. You can specify how tasks are put in place, so if you use synchronization, buffering etc so I can look into the issue for you.

With regard to the questions you have asked.

(1) these functions are not limited to the X series, so they should work as you would expect, and I was not able to find other problems with these features on our system.

(2) unfortunately aid DAQmx is the extent of documentation on these functions, even when there is nothing on our system to go further in the functions.

When you run your program if other programs and applications are open, it can cause treatment slow down, so that bare in mind also. If you run the task, how would this affect the use of the CPU?

I found a few documents concerning your application which can help you to grow and to develop your code.

What makes a High Performance Bus?

and

Streaming of signals of NEITHER: support the flow of data at high speed on external PC buses

in this document, the external challenges of the bus for the Data Acquisition section has some good information on what is feasible with USB devices.

If you have any questions or any other questions or would like some additional information, thanks for posting on this forum and I'll get back to you.

Thank you

Tags: NI Hardware

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