DAQmx Error: -200428

[Aashish_M]

Hi Teresa,

It seems like there might not be enough power for the USB. That's why it's not detecting it being plugged in.
Can you try using an externally powered USB hub?

This should provide enough power to connect to the device.

Hopefully this helps!!

[teresadmij]

Hi Aashish,

Thanks a lot for your response, and I apologize for the delay in responding.

I am sad and concerned about your answer, and that for me was a very bad news . I will try to prove it with an external supply voltage. But I would like that this was not the reason because what I'm looking for is the greater portability.. In the previous message Nathan said that with 80mA would be sufficient, and I do not understand because in the specifications of the Fujitsu said that the PDA can with devices up to 100mA.

Anyway thanks for your advice. And I inform you of the results.

A greeting, thank you.

teresa

[AEwing]

Theresa,

I just received the new USB host cable from HP for the IPAQ-210/211.  I have same issue that you are observing (with a new USB-6009).  6009 works well on PC, and flashes normally.  On PDA host it flashes in what seems a long off, short on LED sequence (rate about same as when attached to PC but the light-on time is shorter). 

I was afraid that current was the issue. I attached with a Kensington external power mini USB 2.0 hub, and the IPAQ-6009 flashed normally and application worked from pda.  I was also disappointed in the implications re. portability.

I then accidentally noticed that withiout power the USB hub still worked. 

I don't think this is a current issue, but some sort of lack in the PDA ('Master USB' cabability mentioned earlier here??).

Try this.

Regards,

Al

[AEwing]

The issue (at least with the IPAQ210) may be due to the USB host being an USB OTG (on the go) implementation.  This is different from standard USB host.  I'm not certain yet if the IPAQ implements standard USB host or USB OTG - info is vague.

Could someone with knowledge of USB details, please confirm whether this may be root cause to issues describe in these posts.  If this is so and a hub is necessary, are there very small solutions to improve portability?

Thanks,

Al

[teresadmij]

Hi AI,

Thank you for your comment, I have a doubt: after you probe with the hub, the card with PDA is working normally now? or still have the problem? because I made an arrangement with transistor to provide a little more power(current) to the card and now works correctly, of course removing portability to my instrument, but not much(i hope).

Regards.

teresa

[AEwing]

Teresa,

Definitely works with just the hub, the 6009 and the IPAQ.  Tried several times.  Am now looking for very small hubs.

I am just measuring the noise at this time, but it does reads fine (I just got it to work yesterday).  I will check tonite with something real. Before it gave me the same error, I believe, that you were seeing. 

Is still possible that it is something else, but I'm suspicious that it is related to USB OTG.  Look into that, it is a USB implementation for portables that, I believe, spec allows for variable hardware setup.  I'm guessing a bit, but seem to have read somewhere that USB must first establish a master/slave relation.  If not done correctly the connection does not complete.  I don't know much about the electronics.

I also checked that it wasn't the physical connection or the length of combined cables that were the issue.  I replaced with several male to female (USB A) cables, I could not make any work without the hub, and all worked with the hub.  I also extended the combination of such cables to a longer length, with the hub in line:  still worked.  So I don't think is either physical links or length issue.

Our situations may be different.  Current issues could be marginal too.  On Brighthand.com forums some folks are discussing ipaq 210 and usb host (google...).  Some have checked the current output.  They say they can draw 200 mA from the ipaq usb (on homemade cables).  Not sure what 6008/6009 requires (especially at startup).  At some point (pushing the current draw up) the ipaq protects itself and shuts down the usb hosting, according to these folks.  What is yours Loox's USB current spec?

Good luck!

Al

[teresadmij]

Hi AI,

Ok, Nathan said that the usb6008 requires a minimum current of 80mA, in the specifications of my PDA, said he could give up to 100mA, but I know that it's not always so.
On the other hand Aashish commented that could be problem of power supply, therefore advised to use a hub, which I have not yet done, but I think that it will work well, and I just try to have another option.
In conclusion by what you mention, I believe that the problem is mainly the power, as i commented I added a simple circuit, which has works correctly
which he used with an adaptor, but I thought replaced by a small battery that helps deliver the necessary power.
If you serve something I've done, we will gladly send your mail with a brief explanation, or if someone else needs it.
Another clarification: my PDA also has USB OTG.

I thank you, and also i wish you good luck.

teresa