Here you can download the source code to control the LCD via all COM port (COM3 in the exemple).
The MatrixLCD class give you all command describe in the datasheet of the LK202-24-USB display and the class PortSerie is the class use to communicate with the LCD screen.
The class IO is an abstract class, you may create more IO class for the MatrixLCD class just by inherite from the IO class and overload the 3 functions (send, receive and initialize).
For more information you can write me by email or respond here.
// en Francais:
Voici un projet C++ realis