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ENGLISH-22
I/O interface
The I/O interface has fi ve pins, and each pin function is described as
below.
1
2
3
4
5
Pin Function
1 VCC IN
(
DC 5.4 ± 0.2 1A
)
TX
Serial Data output port A (TTL
Level
；
Voh
≧
2.4V, Vol
≦
0.4V;
Ioh=Iol=2mA
)
RX
Serial Data input port A(TTL
Level
；
Vih
≧
0.7*VCC
；
Vil
≦
0.3*VCC)
4 GND
5
Outside device (Reserve of software
p
ro
g
ram definition.
)
2
3