Ventilator UI Theory of Operation
1 - 42 046-001141-00 A5/A3™ Service Manual
Warning Light Board Interface, J2
Touch Screen Control Board interface, J4
Display Control Signal Interface, J5
1.6.1.2 Backlight Inverter Board
NOTE: System will have a Backlight Inverter Board or a Screen Backlight
Board.
PIN NAME FUNCTION
1 12V Warning Light Board 12V Power Supply
2GND Ground
3 SDA_CPU CPU Board I2C Data Signal
4 SCL_CPU CPU Board I2C Clock Signal
53_3V 3.3V Power Supply
6GND Ground
PIN NAME Function
15V 5V Power Supply
2 RXD_TOUCH_PANEL Touch Screen Control Board Serial Port Receive Signal
3 TXD_TOUCH_PANEL Touch Screen Control Board Serial Port Transmit Signal
4GND Ground
PIN Name Function
1 LCD_EN LCD Backlight Enable
2 LCD_BR LCD Backlight Brightness Control
3 RXD_TOUCH_PANEL Touch Screen Control Board Serial Port Receive Signal
4 TXD_TOUCH_PANEL Touch Screen Control Board Serial Port Transmit Signal
5GND Ground
6 LED_AC AC Indicator Light Drive Signal
7 LED_BAT Battery Indicator Light Drive Signal
8 SDA_CPU CPU Board I2C Signal
9 SCL_CPU CPU Board I2C Signal
10 RSVD Reserved
11 RSVD Reserved
12 RSVD Reserved
13 RSVD Reserved
14 RSVD Reserved
15 RSVD Reserved
16 12V 12V Power Supply
17 12V 12V Power Supply
18 GND Ground
19 GND Ground
20 GND Ground
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