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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
program definition.)
2
3
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