How to clear the serial port buffer in Labview?

In LabVIEW, we can use VISA (Virtual Instrument Software Architecture) functions to clear the data in the serial port cache.

You can use the following steps to clear the data in the serial port buffer:

1. Open VISA Resource Manager in LabVIEW by navigating to: Instrument I/O » VISA » VISA Resource Manager.
2. Open a serial device using VISA in the VISA Resource Manager. Right-click on a blank area in the VISA Resource Manager window and select “Open VISA Session”.
3. In the VISA session dialog box, choose the serial port device and confirm opening the session.
4. Use the functions provided by the VISA library to clear the data in the serial port buffer. You can use the VISA Flush I/O Buffer function to clear the data in the input or output buffer.
5. For the input buffer, you can set the input parameter Flushing Buffer of the VISA Flush I/O Buffer function to VISA Constants » Flush Input Buffer.
6. Regarding the output buffer, you can use the input parameter Flushing Buffer of the VISA Flush I/O Buffer function and set it to VISA Constants » Flush Output Buffer.
7. After clearing the cache data, you can close the VISA session.

Here is a simple LabVIEW example demonstrating how to use VISA functions to clear data from a serial port buffer.

In the above example, the VISA session of the serial port device is first opened using the “Open VISA Session” function. Then, the “VISA Flush I/O Buffer” function is used to clear the data in the input and output buffers. Finally, the VISA session is closed using the “Close VISA Session” function.

Please note that the above example only demonstrates how to clear the data in the serial port buffer and does not include a complete serial communication code. You may need to make appropriate modifications and expansions based on your specific needs.