To improve the ability of suppressing interference, the communication does not only make use of odd parity and CRC parity, but also apply to the overtime alarm mechanism.
该系统中不但采用了奇校验和CRC校验，还利用定时器设置了超时报警机制，提高了通信系统抗干扰的能力。
Parity bit: a check bit added to a series of binary digits to make the total odd or even according to the logic of the system.
奇偶校验：加于一组二进制数字内的一个校验数元。它跟据系统逻辑，使总数为奇数或偶数。
校验位可以是奇校验或者偶校验。
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