The first method (VISA) program is shown in the figure
First, set the serial port parameters, initialize the serial port, use VISA WITE in the loop to write to the serial port, delay 200 milliseconds, use VISA READ to read, and there is a port property node in the middle to calculate the total number of bytes in the port. It's very simple, but it took me a day to figure it out.
The second method calls the active X
The biggest advantage of ACTIVE X serial communication is that it can use interrupts to achieve data transmission or control of the lower computer. The MSCOMM32 control implements serial communication mainly by setting its property nodes. It also uses the event callback method to implement the interrupt program.
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