Am 02.09.2016 um 11:22 schrieb Xiaofan Chen:
> On Thu, Sep 1, 2016 at 10:30 PM, Joe <[email protected]> wrote:
>>
>> 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):
> You need to check what kind of USB protocol the USB interface uses.
> Maybe it is also a USB Serial Port and you can use the PySerial. If it
> is not a USB serial port and you do not know the communication protocol,
> then you have to carry out reverse engineering.
>
> Google seems to say that sigrok supports it. You can try ask there
> for the protocol.
> https://sigrok.org/wiki/UNI-T_UT61B
>
Thank you, Xiaofan, I'll look at sigrok.
In the mean time I tried another attempt:
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')
print ('dev:\n' + str (dev) + '\n')
dev.set_configuration ()
ep = dev [0] [0,0] [0]
if ep == None:
print ('ep is None')
else:
data = None
while failures < failuresmaximum:
try:
data = dev.read (ep.bEndpointAddress, ep.wMaxPackeSize)
print ('Success. len (date): ' + len (date))
except:
failures += 1
print ('Failures: ' + str (failures))
if data == None:
print ('No data read')
else:
for ss in data:
print (str (ss))
print ('Starting')
Gosub ()
print ('Ready.-')
Output:
Starting
Multimeter UT61B was found
dev:
DEVICE ID 1a86:e008 on Bus 003 Address 003 =================
bLength : 0x12 (18 bytes)
bDescriptorType : 0x1 Device
bcdUSB : 0x100 USB 1.0
bDeviceClass : 0x0 Specified at interface
bDeviceSubClass : 0x0
bDeviceProtocol : 0x0
bMaxPacketSize0 : 0x8 (8 bytes)
idVendor : 0x1a86
idProduct : 0xe008
bcdDevice : 0x1200 Device 18.0
iManufacturer : 0x1 WCH.CN
iProduct : 0x2 USB to Serial
iSerialNumber : 0x0
bNumConfigurations : 0x1
CONFIGURATION 1: 100 mA ==================================
bLength : 0x9 (9 bytes)
bDescriptorType : 0x2 Configuration
wTotalLength : 0x29 (41 bytes)
bNumInterfaces : 0x1
bConfigurationValue : 0x1
iConfiguration : 0x4 Error Accessing String
bmAttributes : 0x80 Bus Powered
bMaxPower : 0x32 (100 mA)
INTERFACE 0: Human Interface Device ====================
bLength : 0x9 (9 bytes)
bDescriptorType : 0x4 Interface
bInterfaceNumber : 0x0
bAlternateSetting : 0x0
bNumEndpoints : 0x2
bInterfaceClass : 0x3 Human Interface Device
bInterfaceSubClass : 0x0
bInterfaceProtocol : 0x0
iInterface : 0x0
ENDPOINT 0x82: Interrupt IN ==========================
bLength : 0x7 (7 bytes)
bDescriptorType : 0x5 Endpoint
bEndpointAddress : 0x82 IN
bmAttributes : 0x3 Interrupt
wMaxPacketSize : 0x8 (8 bytes)
bInterval : 0x5
ENDPOINT 0x2: Interrupt OUT ==========================
bLength : 0x7 (7 bytes)
bDescriptorType : 0x5 Endpoint
bEndpointAddress : 0x2 OUT
bmAttributes : 0x3 Interrupt
wMaxPacketSize : 0x8 (8 bytes)
bInterval : 0x5
Failures: 48
No data read
Ready.-
Does anybody see the mistake?
Thank you - Joe
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