A new journey with Labview - simple serial port program

      The practical training course I taught this time was based on Labview, and the most critical part was the serial communication part. After observing for two weeks, I found that many students were not very good at it. So I tried it myself, and the basic steps are as follows:

1. Add serial port control

       Personally, I feel that the biggest feature of Labview is that all devices are modular, which means that they can be directly dragged from the panel to the program you are writing. For this serial port program, the serial port control is naturally the most important part. By right-clicking in the program flowchart and selecting Instrument I/O->Serial Port->VISA Configure Serial Port (as shown in Figure 1), you can complete the addition of the serial port configuration control. In the program of this article, the only settings required for the serial port are serial port selection and serial port baud rate settings, so this program only introduces the above two groups of serial port settings (as shown in Figure 2). It should be noted here that the baud rate of the hardware serial port I use is 115200, so this program also sets the baud rate to 115200.

 

2. Add serial port program

        After adding the serial port control, the next step is to complete the serial port program. Since Labview is a modular programming, you only need to drag the corresponding programming language module into the program. This article uses the While loop: after completing the serial port settings, the program enters the main loop and first determines whether the serial port is open, and then continuously reads the serial port data. This is the basic idea. The program when the conditional statement is true is as follows:

      The procedure is as follows when the conditional statement is false:

Figure 4 The program when the if statement is false [page]

3. Control layout

       After completing the first two steps, the corresponding controls have appeared in the front panel. All we need to do is to organize its layout. The interface of the entire program is arranged as follows:

4. Experimental results

      Through the above steps, the serial port program is basically completed. Of course, this is a simple serial port program, and the steps are still very simple. Let's take a look at the effect: