The STONE LCD screen is driven by variables. All displayed characters and icons are defined as a variable, and the variable storage address is assigned and the display format is defined, then a configuration file is generated and downloaded to the display terminal. When the display needs to be refreshed, the user simply sends the variable content and the variable storage address to the display terminal via the serial port, and the display terminal will automatically display according to the defined display format.
The display format is fixed for each variable and is defined by the configuration file downloaded to the VGUS screen.