2-6 
 
2.4 Front Housing Assembly 
 
 
 
 
 
 
2.4.1 Main Board 
The main board is the control center of the system. It provides communication, display, and data storage functions, 
including: 
  Display drive and backlight control 
  Wired and wireless network 
  Data Storage 
  Printing 
  Serial port communication 
  Connection with touchscreen control board 
  Audio drive 
  EEPROM drive 
  USB drive 
 
 
2.4.2 Keypad 
The keypad scans and detects the input of keys and knobs, integrates the power on/off key, and connects AC and 
battery indicators. 
 
Touchscreen 
control board 
Main board 
Alarm lamp board 
Keypad 
Lock hatch 
Wi-Fi module
Screws fastening the front and rear housing