[COM] Communication issue with OWON DGE2000 using USB #482
Comments
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I assume you are constructing the connection string manually because The reason for that might be that, according to output presented, currently device enumerates as a HID device, not USBTMC. Manual suggests that you can change USB device mode in device settings — have you tried that? |
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Thanks for your answer. For reference the relevant section in the manual is this: After change the USB Dev to So now using this Python code: import logging
logging.basicConfig(level=logging.DEBUG)
import pyvisa
USB_VENDOR_ID = 0x5345
USB_PRODUCT_ID = 0x1235
# Initialize the VISA resource manager
rm = pyvisa.ResourceManager("@py")
instruments = rm.list_resources(f"USB?::{str(USB_VENDOR_ID)}::{str(USB_PRODUCT_ID)}::*")
print("Available instruments:", instruments)
if len(instruments) > 0:
DGE = instruments[0]
print(f"Using instrument: {DGE}")
else:
print("No instruments found")
exit()
try:
DGE2070 = rm.open_resource(DGE, open_timeout=10000)
DGE2070.read_termination = DGE2070.write_termination = '\n'
idn_response = DGE2070.query('*IDN?')
DGE2070.close()
print(f"Instrument Identification: {idn_response}")
except Exception as e:
print("Error pyvisa:", e)Gives this result: "win error: Se agotó el tiempo de espera del semáforo." means something like: win error: The flag timed out expired. |
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WinUSB Zadig driver doesn't work. Using the Zadig driver libusb-win32 (v1.4.0.0) DEBUG:pyvisa:SerialSession was correctly imported.
DEBUG:pyvisa:USBSession and USBRawSession were correctly imported.
DEBUG:pyvisa:TCPIPSession was correctly imported.
DEBUG:pyvisa:GPIBSession was not imported No module named 'gpib'.
DEBUG:pyvisa:Created library wrapper for py
DEBUG:pyvisa:Created ResourceManager with session 2967742
DEBUG:asyncio:Using proactor: IocpProactor
Available instruments: ('USB0::21317::4661::XXXXXXXX::0::INSTR',)
Using instrument: USB0::21317::4661::XXXXXXXX::0::INSTR
DEBUG:pyvisa:USB0::21317::4661::XXXXXXXX::0::INSTR - opening ...
Traceback (most recent call last):
File "w:\Python\dge2070\main.py", line 55, in <module>
DGE2070 = rm.open_resource(DGE)
File "W:\Python\dge2070\.venv\Lib\site-packages\pyvisa\highlevel.py", line 3292, in open_resource
res.open(access_mode, open_timeout)
~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "W:\Python\dge2070\.venv\Lib\site-packages\pyvisa\resources\resource.py", line 281, in open
self.session, status = self._resource_manager.open_bare_resource(
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
self._resource_name, access_mode, open_timeout
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File "W:\Python\dge2070\.venv\Lib\site-packages\pyvisa\highlevel.py", line 3217, in open_bare_resource
return self.visalib.open(self.session, resource_name, access_mode, open_timeout)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "W:\Python\dge2070\.venv\Lib\site-packages\pyvisa_py\highlevel.py", line 169, in open
sess = cls(session, resource_name, parsed, open_timeout)
File "W:\Python\dge2070\.venv\Lib\site-packages\pyvisa_py\sessions.py", line 329, in __init__
self.after_parsing()
~~~~~~~~~~~~~~~~~~^^
File "W:\Python\dge2070\.venv\Lib\site-packages\pyvisa_py\usb.py", line 82, in after_parsing
self.interface = self._intf_cls(
~~~~~~~~~~~~~~^
int(self.parsed.manufacturer_id, 0),
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
int(self.parsed.model_code, 0),
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
self.parsed.serial_number,
^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File "W:\Python\dge2070\.venv\Lib\site-packages\pyvisa_py\protocols\usbtmc.py", line 308, in __init__
super(USBTMC, self).__init__(vendor, product, serial_number, **kwargs)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "W:\Python\dge2070\.venv\Lib\site-packages\pyvisa_py\protocols\usbtmc.py", line 220, in __init__
cfg = self.usb_dev.get_active_configuration()
File "W:\Python\dge2070\.venv\Lib\site-packages\usb\core.py", line 935, in get_active_configuration
return self._ctx.get_active_configuration(self)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
File "W:\Python\dge2070\.venv\Lib\site-packages\usb\core.py", line 113, in wrapper
return f(self, *args, **kwargs)
File "W:\Python\dge2070\.venv\Lib\site-packages\usb\core.py", line 259, in get_active_configuration
bConfigurationValue=self.backend.get_configuration(self.handle)
File "W:\Python\dge2070\.venv\Lib\site-packages\usb\backend\libusb0.py", line 528, in get_configuration
assert ret == 1
^^^^^^^^
AssertionError
DEBUG:pyvisa:Closing ResourceManager (session: 2967742) |
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If I use the app > .\WinUsbTmc.exe /R 0 "*IDN?"
OWON,DGE2070,XXXXXXXX,SCPI:99.0 FV:V1.0.3.3.100
> .\WinUsbTmc.exe /R 0 "OUTPut1:STATe ON"The last line turns on the channel 1 correctly So, I could assume that the libusbK (v3.1.0.0) driver from the Zadig application is correct. |
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Any idea how to solve it? |
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Instrument details
Output of
pyvisa-infoUsing this python script to look for devices:
Gives this: (Serial number replaced by XXXXXXXX)
Now using
usbmodule to get information about the specific device:Gives this result: (Serial number replaced by XXXXXXXX)
Using pyvisa to gain access to the device using the previously constructed resource chain:
Gives this error:
Note
"ASRL1" is an Intel mainboard serial port.
The same response with USB1, RAW, and ::1::INSTR
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