We need to control about 6 or 7 usb 6008s or 6009s. We have a few of each. The DAQs will not turn on when plugged into the usb hub we are using. I have tried different computers (both quite old and running Windows XP however), and also different ports of course. The hub ports are rated to 500mA each, while the DAQs typical draw is 80mA with a max of 500mA so power should be the issue. I've also tried two different usb hubs and am getting the same results. There have been points in time where the setup has worked, but after powering down there is no guarentee it will work again. When the DAQs are plugged directly into the computer and working, the green light they have will flash half on half off (50% duty cycle), but when plugged into the port and not working, sometimes the light will blink on then off really fast, like a 5% duty cycle. I am unsure of what that may be indicating. Could the DAQs not be getting enough power or is this just due to old computers? Should DAQs not run on hubs? I don't see an alternative to using a hub if that is the case though.
↧
