ni-5680 rf power meter not detected in soft front panel

[JohnFenner]

Can you run IO Trace while you unplug and replug, so I can see some details.

[yash3207]

nothing is happening.... the screen remain blank in IO trace.

[yash3207]

also unplugging and replugging the USBs is hanging rf power meters.

system got crashed by doing this.

[KittF]

I've had a number of isntances where USB devices (NI and others) behave poorly depending on the PC hardware.  

1) I assume you are plugging these all into the same PC, right? 

2) Is this PC or laptop? Vendor? Model?

3) Exactly what are you plugging the device into?  hub? card? front ports? back ports? ????

4) if you plug each device in separately, one at a time, are they each detected in MAX and pass self test?

Not all USB ports are created equally. Some have very poor performance powerwise, and detectionwise.  Some share power and when you plug in multiple device the power profile over time really stinks, and can cause drop out, and strange behavior. 

I have several times bought a reliable powered USB hub, inserting it between PC and device(s), and all problems have vanished.  

I wonder if this is the source of your problems.

Kitt

[mbb25]

That's great advice, Kitt.  I've seen the same thing...a usb device will fail to detect at one USB port but work fine in another.  A low power device like a mouse or keyboard will work fine in the flakey port.  I'm guessing the devices that don't work well need more power than that USB port can deliver.  If you have good documentation for your motherboard, it *might* tell you which USB spec each port complies with (USB 1.0 and 2.0 are different not just in speed, but I believe in power as well).  I like Kitt's suggestion of trying a powered USB hub.

The 5680 has had some issues with being properly detected.  I think they are caused by race conditions in the device detection code in the driver stack (it's been a while since I checked into this).  Those problems should have been improved in the latest driver, which doesn't seem to be helping you at all.  Host usb hardware fits your symptoms better.