I'm running Windows 7.   I can get a bit of information about the device
from the test program of libusb, if that would be helpful for you.  I'm
having a bit of trouble understanding how to use the debug feature.  When I
type "export PYUSB_DEBUG_LEVEL=debug"  into the Python command line, I get
an error message with "invalid syntax."


On Wed, Jul 17, 2013 at 2:33 PM, Elizabeth Tolman <etol...@princeton.edu>wrote:

> Hello,
>
> I'm new to pyusb and to working with usb devices in general.  I'm trying
> to read voltage data from a Tenma 72-7732 multimeter, but I'm having some
> problems.  This is my code so far:
>
> def main():
>     import usb.core
>     import usb.util
>     import usb.backend
>
>     #find device
>
>     dev = usb.core.find(idVendor=0x1a86, idProduct=0xe008)
>
>     # did you find it?
>     if dev is None:
>         raise ValueError('Device not found')
>     else:
>         print "Device found"
>
>
>     dev.set_configuration()
>
>
>     endpoint = dev[0][(0,0)][0]
>
>
>     data = dev.read(endpoint.bEndpointAddress, endpoint.wMaxPacketSize, 0,
> 100000)
>
>     print data
>
>
> main()
>
>
> This finds the device, but gives a timeout error when it tries to read
> data.  Do you have any idea what might have gone wrong?  The multimeter has
> very poor documentation, so I can't go there for advice.
>
> Thanks,
> Libby
>
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