usb 1.0 or USB 2.0

[zgut]

I am using USB-6251 (OEM) card and DAQmx library.

I would like to know if I am using USB 1.0 or USB2.0 port.

If there is procedure which allow to abtain me this information.

Regards

[MikeS81]

Hi zgut,

see this link, please. Read point Bus Interface.

Hope it helps.

Mike

[zgut]

It'si OK but my problem is different.

Presently my card is connecting to Low-Speed  USB port.

For this card max sample rate is 1.25 MHz.

But when I am doing mearument from this frequency (1-channel) I obtain error "DAQmx Error: Measurements: Onboard device memory overflow. Because of system and
/or bus-bandwidth limitations, the driver could not read data from the device fast enough to keep up with the device throughput. Reduce the sample rate, or reduce the number of programs your computer is executing concurrently."

Simply, I would like to know (by using software) if my card is connecting to USB 1.0 or USB 2.0. In the future if I will change computer so I change the maximum frequency.

Regards

[Stefo]

Hi zgut,

Sorry, I had some troubles with explorer

Good luck,

Martin

Message Edited by Stefo on 01-23-2009 03:10 AM

[Stefo]

Hi zgut, I checked DAQmx property nodes, and there is nothing which could help you straight. Moreover, I have tried to check this information manually in Windows Device Manager and I searched for this information in Windows Registry as well. Honestly, I was not able to find it in Windows either (of course because of lack of my Windows knowledge). I was looking in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB\, where are couple of directories (look like device history).You can find there even directory ROOT_HUB and ROOT_HUB20, which I believe indicate the actual USB standards (I can’t promise because I didn’t find much information about). However, even if I’m right, this way you could find just information if you have USB 2.0 available in your system. Maybe if you open key for the card itself, you might find more information there.  Good luck, Martin

Kudos! Thanks!

[MartonLitkei]

Dear zgut,

In device manager if you see the word "enhanced" in the Root HUB's name, where the device connects to, it means it is a USB 2.0. host.

You may also try some 3rd party application that can tell this (SiSoft Sandra for example, that for we don't take any responsibility).

Regards,

Marton

NI Hungary