2-23
Pin No. Signal Name Discription
18)
GND Ground
19)
12VA
12V supply
20)
GND Ground
Definition of key control board J2 (port connected with alarm light board)
Pin No. Signal Name Discription
1)
12VA
12V supply
2)
GND Ground
3)
SDA_CPU Main control board IIC data signal
4)
SCL_CPU Main control board IIC clock signal
5)
3V3_Keyboard
3.3V supply
Definition of key control board J3 (port connected with screen backlight)
Pin No. Signal Name Discription
1)
12VA
12V supply
2)
GND Ground
3)
EN Backlight enable signal
4)
PWM
Backlight brightness adjustment
signal
Definition of key control board J4 (port connected with encoder board)
Pin No. Signal Name Discription
1)
5V_Touch_screen
5V supply
2)
A Encoder output A
3)
B Encoder output B
4)
S Encoder is pressed down
5)
GND Ground
Definition of key control board J5 (port connected with touchscreen)
Pin No. Signal Name Discription
1)
UR_H Touchscreen coordinate signal
2)
LR_XL Touchscreen coordinate signal
3)
AD3 Touchscreen coordinate signal
4)
UL_YT Touchscreen coordinate signal
5)
LL_YB Touchscreen coordinate signal
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