Multiple 9221/9162 USB DAQ Conflict

[mattmaka]

I'm using LabVIEW 8.6.1 and NI-DAQ  8.8 on Windows XP. I'm trying to set up two NI 9221/9162 usb controlled DAQs to work at the same on the same computer. Each unit works individually, but If I plug one in after another the first one that was plugged in stops responding and I get the below error on a self test in MAX.

When I attempt to use the unresponsive DAQ with the softpanel in MAX I get the following error.

However, if I plug both usb cables into the computer at the exact same time I don't get the device conflict error. Unfortunately this work around is not a desirable solution for the environment this test will be deployed in. This problem persists on different PCs. Is there a better solution for this problem that will allow both devices to respond regardless of the timing in the plugging in the usb cables?

Thanks you.

[Brandon_B]

Hello,

Thank you for using NI forums.  Are you plugging these devices in through a USB hub or directly to the USB ports on the comp?  The reason I'm asking is because this behavior is usually the result of using a hub for your USB devices.

Regards,