Hello, I want to measure 2 channels of Daqmx USB-6211 continously. If I want to write USB-6211, I make anywhere in the project global variable "Permission for using usb-6211" false and don't measure anything, just write (value of magnetic field for example). Question: I want to know if the device is connected. If not - no measurement, no writing. How to easily check if device is connected? Previously I made as in example plus didn't clear task if device is disconnected. In several boots of Labview it resulted in: a) the error before Labview booting: "The last time you ran LabVIEW, internal warning 0x30EA5E5C occurred in fpinval.cpp." b) total freezing at each using of DAQmx Create Task Each time I must reinstall NI-DAQmx to make its functions work. Please help. Thanks, Gregory.

Hi dimitriev, you can check available DAQmx devices using DAQmx property nodes. When you use two USB6211 you can even check their serial numbers:

LabVIEW

Solved!

@GerdW wrote:

my Q … but plz … u plz
Please read this!

Yeah you may want to read this too, specifically the how to post a question section.

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