On Tue, Sep 8, 2015 at 8:58 AM, Srinidhi Kuntaegowdanahalli <storageac...@gmail.com> wrote: > Hi: > > I am new to python and I am using pyDAQFlex to interface with an USB DAQ > from Measurement Computing. > > pyDAQFlex uses pyUSB. I have installed "libusb-win32-filter-bin-0.1.12.1"
That is super outdated and no longer supported. Unless you are using Windows 98/ME, you should not use this old version of libusb-win32. Latest version is 1.2.6.0. Web site: http://sourceforge.net/projects/libusb-win32/files/libusb-win32-releases/1.2.6.0/ > and I am able to see my DAQ through the GUI which pops up after > installation. When I run the test code for pyDAQFlex, I get the following > error: > > File "C:\Python25\lib\site-packages\daqflex\devices.py", line 234, in > __get_in > terface > alternate_setting = usb.control.get_interface(self.dev, intf_number) > File "build\bdist.win32\egg\usb\control.py", line 244, in get_interface > File "build\bdist.win32\egg\usb\core.py", line 971, in ctrl_transfer > File "build\bdist.win32\egg\usb\backend\libusb0.py", line 528, in > ctrl_transfe > r > File "build\bdist.win32\egg\usb\backend\libusb0.py", line 380, in _check > usb.core.USBError: [Errno None] usb_control_msg: sending control message > failed, > win error: The request is not supported. > > > The last line seems to indicate that this is an issue with pyUSB > rather than the DAQflex module. Why do you say so? This means that you are sending a control message wrongly -- most likely the device does not understand your command. Do you have the USB communication protocol of your DAQ? -- Xiaofan ------------------------------------------------------------------------------ _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
