2-4  
 
2.3 Main Unit 
 
The patient monitor consists of: 
  Input system: button board, knob, touchscreen, power switch and LED board 
  Output system: LCD panel, alarm LED board, recorder and speaker 
  Processing and communications system: main board and integral module rack assembly.     
  Power management system: battery, battery interface board and power module   
  Equipment interface system: USB_Hub interface board, DVI interface board CF card 
assembly and internal wireless network card. 
 
Additionally, the patient monitor can also connect a satellite module rack (SMR), parameter 
modules, mouse, keyboard, etc. 
 
The following diagram illustrates the structure of the patient monitor