2-11
The following diagram shows the pins of the power module socket (excluding the pins of the
battery power socket. On power board, pin 1 has a triangle symbol):
Pin ID Marking Description Cable
color
2, 4, 6, 7,
13, 15, 17
GND The output grounding terminal of the power board. Black
8 RXD Receives serial communications (the main board sends). Purple
9 TXD Sends serial communications (the main board receives). Brown
10 PCON
Power on/off control signal. It is a TTL pulse signal
inputted from the back board. Every time when the power
on/off switch is pressed (pulse of falling edge), a switch
between power “on” and “off” happens. The pulse
duration is no less than 0.1 s for power-on and no less
than 2 s for power off.
Blue
11 LCD-EN
Backlight on/off control signal. The main board sends a
backlight on/off control signal to the power board through
the serial interface. The power board processes the
received signal and then outputs a high or low level
depending on the received signal.
Green
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