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Large-display CPU board (top view) 
 
Large-display CPU board (bottom view) 
 
2.2.3.2 Display and Touchscreen 
An 18.5-inch 1920×1080 full laminated display assembly is used, consisting of a display and a 
touchscreen. It acts as the main input/output part for man-machine interaction. 
2.2.3.3 Key Lighting Board 
The key lighting board is installed at the bottom of the display assembly for the lighting of the 
work surface. It provides a key to switch between the three light settings: high brightness, low 
brightness, and off. In addition, the key lighting board is connected to the main encoder board 
and the flowmeter encoder to identify the encoder, and communicates with the host computer 
(CPU board) through the serial port. This board is configured with software.