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XP502(4PIN/2.0mm)
Pin NO.
1
2
3
4
（
） 、
CON9
Right
CON12
Pin NO.
1
2
CON7(4PIN/2.5mm)
Pin NO.
1
2
3
4
9、Circuit Diagram (See the Next Page)
：
Control panel interface
Def.
KEY1
GND
KEY0
GND
（
）
Left
(2PIN/2.5mm)
Def.
SPK+
SPK-
：
Software upgrade interface
Def.
5V
GND
RXD
TXD
Description
Control panel signal 1
Ground
Control panel signal 1
Ground（No connect）
：
Sound output
Description
Sound output signal +
Sound output signal -
Description
CPU Power
Ground
RXD signal
TXD signal
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