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The CPU oscillates between idle state around 4% to 10-12% when it's in use.
使用时，CPU空闲状态的波动在4%到10 - 12%之间。
A resistor is connected between each line and + 5v, so the idle state of the bus is high.
在+ 5 V和每根线之间连接着一个电阻，所以总线的空闲状态是高电平。
It indicates that the device is in its idle state, ready to receive characters on the RS232 port.
这表明该装置是在其空闲状态，准备接收的RS 232端口字符。
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