X”项被丢掉,因为,它只影响商(被丢弃)而不影响余数(CRC字符)。生成的多项式是1010 0000 0000 0001。把余数全部初始化为1。查询不允许使用地址0,因为这不能是–个广播请求。功能代码是01.开始点编号是双字节长,可以是任何小于附属CPU里最高输出点有效编号的值。
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