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<X> 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