STX                   ADDR                    FUNC                                 LEN                                   DATA                                LRC                        END
启始单元          通讯位置                功能码                                  资料长度 资料内容:         设定： 2 个ASCII组合 
                                                                                        设定：1个word时LEN=3 成N个Byte,            最多有50个
                                                                                         1个 Byte时<1Byte时LEN =2 ASCII
对01变频器写入30.00Hz(  写  入  CD000  ）
STX                        ADDR                  FUNC                  LEN                 DATA                         LRC                           END

:                              0  1                      0   2                      0   3  &nbs