S9 Operator Board Maintenance Instructions
8. IO Pin definition for each port
As shown in the figure above
：
1
、
2
、
9
、
10
、
13
、
14
：
GND
。
3
、
4
（
SDA
、
SCL
）：
DC-DC PIC I2C Bus
，
Connect the Control Panel to PIC of communication
，
The control board can read and write through it PIC Data
，
Control the operating state of
its operational board.
5 (PLUG0
）：
Identifying signals for the operating board
，
This signal is pulled by the operator board. 10K Resistance to 3.3 in
，
So plug it in. I Signal when
，
The foot should be
to high level.
6
、
7
、
8
（
A2
、
A1
、
A0
）：
PIC Address signal.
11
、
12
（
Txd
、
RXD
）：
For the arithmetic board 3.3 End of the counting force of the channel
，
After being divided by a resistor, it becomes TX
（
CO
）、
RX
（
RI
）
Signal
，
I Port pin End ping du for 3.3v
，
After the voltage is divided by the resistor
，
Become a 1.8v.
15
（
RST
）：
To reset the signal 3.3v
，
After being divided by the resistor, it becomes 1.8v in RST Reset Signal.
16
（
D3V3
）：
For the arithmetic board 3.3v Power supply
，
3.3v Provided by the Control Panel
，
Mainly to the PIC provides operating voltage.
Figure 9 , Figure 10 are shown as IO Voltage and distribution of each pin before and after the pressure is divided.
9
、
I Each voltage of the signal
7
