它等于在预设多个寄存器请求的数据组里的字节数。注意，字节计数等于两倍的寄存数量。寄存器按照最小编号寄存器在数据组头两个字节最高编号在数据字段的最后两个字节的顺序送进数据字段。数据字段中第–个寄存器的编号等于开始寄存器加1。每个寄存器高位字节比低位字节先发送。

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