couldn't connect to my ue9 using usb in linux platform NEED HELP

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Sun, 08/20/2017 - 07:27

kevin21

couldn't connect to my ue9 using usb in linux platform NEED HELP

[email protected]-desktop:~/Desktop$ python

Python 2.7.12 (default, Nov 19 2016, 06:48:10)

[GCC 5.4.0 20160609] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> import ue9

>>> d = ue9.UE9()

Traceback (most recent call last):

File "<stdin>", line 1, in <module>

File "build/bdist.linux-armv7l/egg/ue9.py", line 92, in __init__

Args: firstFound, Open the first found UE9

File "build/bdist.linux-armv7l/egg/ue9.py", line 111, in open

Subnet = None, PortA = None, PortB = None, DHCPEnabled = None)

File "build/bdist.linux-armv7l/egg/LabJackPython.py", line 607, in open

File "build/bdist.linux-armv7l/egg/LabJackPython.py", line 1352, in openLabJack

raise NullHandleException()

File "build/bdist.linux-armv7l/egg/LabJackPython.py", line 1248, in _openLabJackUsingExodriver

LabJackPython.NullHandleException: Couldn't open device. Please check that the device you are trying to open is connected.

Mon, 08/21/2017 - 12:48

LabJack Support

First power cycle (USB

First power cycle (USB disconnect and reconnect) your device and try the open call again.

Second, make sure no other application has your UE9 open. Only one application can claim a USB handle to the device at a time.

Third, make sure your UE9's power LED is on. This indicates the UE9 has power and is enumerated on your system. Also, you can run the "lsusb" command to see if Linux is detecting it is connected. The UE9's vendor ID is 0x0CD5 (hex value) and the product ID is 9. If your UE9 is not being detected or powered when connected over USB, try a different USB port.

Thu, 09/07/2017 - 02:32

kevin21

Hi,Support team

thanks it works well with your advise.

Rgs

Kvin.21

Sat, 06/20/2020 - 03:30

m. corus

Hi everyone,

I'm facing the same issue, running under linux (Debian based). libusb-1.0, exodriver and LabjackPython have been installed, whithout error (or without me seeing them).

What I tried :

* Plug in each USB port, and check that the led is on. It flashes for a second or two, and it stays on each time.

* Tried it after several reboot, assuming it would kill any other call to the device (U3-HV). I call them only once.

* Tried to unplug and replug in the same port, and different ports

* lsusb indicates that labjack is plugged

And I still have the same error :

LabJackPython.NullHandleException: Couldn't open device. Device access or claim error. Please check that the device is not already open in another or the current process.

I tried to go a bit further, to catch the error, and used the LabJackPython.py functions to catch the error. I could check that :

* device is recognized : staticLib.LJUSB_GetDevCount(3) gives 1

* ctypes.get_errno() gives 13 (got 11 once, yesterday...)

Any clue would be welcome...