nidaqmx.errors.DaqError: -50405: No transfer is in progress or transfer was aborted

[wanghuqiang123]

Bug Report: Occasional -50405 Error with USB-6009 During Continuous Acquisition

Description

I am experiencing the occasional -50405 error ("No transfer is in progress or transfer was aborted") when using the NI USB-6009 DAQ card with the nidaqmx Python library. The error occurs unpredictably during continuous data acquisition.

Steps to Reproduce

1. Create a task and configure it for continuous sampling.
2. Call task.start().
3. Continuously call task.read() in a loop to fetch data. In my case, I'm reading 10 samples every 50ms.
4. The error -50405 occurs randomly after some time.

Expected Behavior

The task.read() should consistently return data without throwing the -50405 error as long as the device is connected and the task is properly configured.

Actual Behavior

After running successfully for a period (could be minutes or hours), the application crashes with the following error:
nidaqmx.errors.DaqError: -50405: No transfer is in progress or transfer was aborted.
Task Name: _unnamedTask
Status Code: -50405

The only way to recover is to physically disconnect and reconnect the USB-6009 device.

Environment

• Python Version: 3.11.9
• nidaqmx Package Version: 1.2.0
• NI-DAQmx Driver Version: 2024 Release (exact version number not specified)
• Operating System: Windows 10 64-bit
• Hardware: NI USB-6009

Additional Information

• I have double-checked my task configuration parameters (sample rate, number of samples to read, etc.) and they seem correct.
• The issue is intermittent and not easily reproducible on demand.
• Restarting the Python script without unplugging the device does not resolve the issue. A physical reconnection is required.

AB#3541490

[zhindes]

Can you share your whole script? Also what is your system usb configuration?

• Open Device Manager
• Find the 6009 under "NI Data Acquisition Devices"
• Select the 6009
• Change the View to "Devices by Connection"

For example, here is what I see for my mouse. I don't have a DAQ device on this setup, but it should look similar.

[charitylxy]

Hi @wanghuqiang123, could you share the script that reproduces this error?

[charitylxy]

Running python example cont_voltage_acq_int_clk.py with slight modification based on the information provided.

• rate= 200 (10 samples / 0.050s)
• number_of_samples_per_channel=10

I have had the script running for few hours without encountering error -50405.

Closing this issue as not planned as we can't reproduce the issue. Feel free to reopen when there's more information.