LabVIEW is a development environment that uses a graphical programming language, making it distinct from traditional text-based programming languages. While it shares similarities with conventional languages in terms of data types, control structures, and debugging tools, the key difference lies in its visual approach—LabVIEW uses icons, symbols, and wiring to create programs instead of writing code. This makes it more intuitive and user-friendly, especially for those who may not be familiar with traditional coding.
One of LabVIEW’s major strengths is its ease of use, intuitive interface, and powerful capabilities in data visualization, analysis, and instrument control. It also provides a comprehensive set of functions for file manipulation, allowing users to easily read and write various file types, such as text files, binary files, and data reports. When reading data via VISAread, the data must often be converted into table format before being saved. The saving process typically involves two stages: first, displaying the data on the main interface along with time stamps for real-time monitoring, and second, exporting the data to an Excel file for later printing or analysis. If real-time display is not required, the data can also be directly saved to a TXT file, which can be opened in Excel.
The design of the data display module takes dynamic real-time performance into account. Each data frame corresponds to a specific time, and users can customize both the time display and the interval between data updates. This flexibility allows the system to meet different testing requirements. Figure 1 shows the dynamic data table generated by the subroutine, illustrating how the data is updated and displayed over time.
Considering the frequency of serial port reads, there are two main approaches. In the first scenario, the host computer periodically reads the serial port, ensuring that incoming data is displayed and stored at regular intervals. In the second case, the host reads the serial port non-periodically, and data is only displayed when it arrives. For the first case, Figure 2 shows the corresponding code structure. Data from the serial port is processed using functions like StringSubset, then merged and converted into a table format. A Combobox within a While Loop allows users to select the desired save interval. Notably, the data shown in Figure 1 represents a fixed analog input value.
For the second case, the program needs to be modified by removing the Combobox and incorporating a Case structure. A local variable can be used to check whether data has been received, determining whether to display it. This approach ensures efficient handling of asynchronous data streams.
In the project, each test parameter is displayed in real-time using a WaveformChart, allowing users to visually monitor changes and assess whether the test conditions are met. This real-time feedback is crucial for accurate and timely decision-making during testing.
Saving the form data displayed on the main program interface is an essential part of the process. Although the data can be visually displayed on the front panel, storing it is equally important for post-analysis. The "Save Data" button, which is a Boolean type, allows users to choose whether to save the data. When enabled, all real-time data is saved to a specified file; when disabled, no data is saved. This gives users full control over the data retention process. In LabVIEW examples, this functionality is commonly implemented by replacing the default table with a custom one and setting up attribute nodes for row and column headers. This way, the entire form, including headers, can be saved to a file for future reference.
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