[pyusb-users] reading multimeter

[Elizabeth T. <et...@pr...>]

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