USB-6009 device not found problem

[Solis]

Hello all,

So my VI and USB-6009 have been working fine until recently.  I noticed the VI was not reading or graphing information from the analog input channel correctly.  My firmware is up to date, but I noticed a problem.  In Isdaq, it will recognize that the USB-6009 is connected, then when I run my VI and stop it, i check Isdaq for my device again, and it does not recognize any device.  I have to unplug the daq and replug it for Isdaq to recognize the usb-6009 again.  But each time I run my VI, it does not seem to collect any data, and it makes the device unrecognizable.  Do you know what the problem might be?  Attached is the VI I have been running in case you want to look at it.  Its been working fine until now.  

btw, I am running Labview on a Mac OS X

Thanks for the help!

[Solis]

I've updated all my firmware and tried everything, but my VI does not seem to work.

[Ali M · Accepted solution]

Hello Solis,

I would recommend making changes to the parallel tasks to use the error cluster to force the order of execution, since NI-DAQmx Base is not multi-thread safe (review NI-DAQmx Readme). Please verify if this alleviates the issue.

Best regards,

Ali M

Applications Engineer

National Instruments

www.ni.com/support

[John_P1]

Hi Solis,

In addition to what Ali said, you also need to clean up your AO tasks with DAQmx Base Clear Task after you exit the loop.

Best Regards,

[Solis]

Thank you for the suggestions guys, I got it to work !