We use two DMMs UNI-T UT61B. They have two interfaces each, a RS232C
Interface and a USB interface.
The RS232C interfaces work well. Without any command before, the DMMs
continuously send 2 .. 3 packages of 14 Bytes per second. We get them
with a little Python 3.52 script, using PySerial. It's ok.
But the younger of our computers have no RS232C comports, and I don't
want to use virtual comports. So I try to use the USB interfaces of the
DMMs with PyUSB 1.0, but somethin is wrong with this test script (using
Win10 Version 1607, 64 bit):
import usb.util
import usb.backend.libusb1
def Gosub():
failures = 0
failuresmaximum = 48
dev = usb.core.find (idVendor = 0x1a86, idProduct = 0xe008) #
Multimeter UT61B
if dev == None:
print ('Multimeter UT61B not found')
else:
print ('Multimeter UT61B was found')
dev.set_configuration (1)
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 = None
while failures < failuresmaximum:
try:
s = ep.read (64, 50)
print ('Success. len (s): ' + len (s))
counter = 0
except:
failures += 1
print ('Failures: ' + str (failures))
if s == None:
print ('No data read')
else:
for ss in s:
print (str (ss)) # Not decoded; just to check:
something received?
print ('Starting')
Gosub ()
print ('Ready.-')
I get this output:
Starting
Multimeter UT61B was found
Failures: 48
No data read
Ready.-
How to fix - any hint?
Regards - Joe
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