Multimeter USB output

[Joe]

Hi,

I'm using Python 3.5.1 with PyUSB 1.0 under Win 10 (64). We try to read 
the USB output of a DMM 'UT61B'.

import usb.core
import usb.util
import usb.backend.libusb1

def Gosub():
      dev = usb.core.find(idVendor=0x1a86, idProduct=0xe008) # Digital 
Multimeter UT61B
      if dev == None:
          print ('Multimeter not found')
      else:
          print ('Multimeter was found')
          dev.set_configuration()
          cfg = dev.get_active_configuration()
          intf = cfg[(0,0)]
          ep = usb.util.find_descriptor(
              intf,
              custom_match = \
              lambda e: \
                 usb.util.endpoint_direction(e.bEndpointAddress) == \
                 usb.util.ENDPOINT_IN)
          if ep == None:
              print ('ep is None')
          else:
              s = ep.read(64, 500)
              print ('Len s: ' + len(s))

print ('Starting')
Gosub()
print ('Ready.-')

Result:

File "d:\work-d\PythonProgs\ut61b.py", line 27, in <module>
    Gosub()
File "d:\work-d\PythonProgs\ut61b.py", line 23, in Gosub
    s = ep.read(64, 500)
File "D:\Python3\Lib\site-packages\usb\core.py", line 402, in read
    return self.device.read(self, size_or_buffer, timeout)
File "D:\Python3\Lib\site-packages\usb\core.py", line 988, in read
    self.__get_timeout(timeout))
File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 851, in 
intr_read
    timeout)
File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 936, in 
__read
    _check(retval)
File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 595, in 
_check
    raise USBError(_strerror(ret), ret, _libusb_errno[ret])

usb.core.USBError: [Errno 10060] Operation timed out

What's wrong? How to fix?

Regards -- Joe