复制页面串口通信约定 波特率 ：115200 数据位 ：8 奇偶校验：无 停止位 ：1 数据流控：无 帧格式说明 字段长度说明帧头1消息帧的起始标志，使用固定值0xa5版本1定义不同版本，本版固定为0x02命令1定义不同命令长度2数据的总长度，大端法表示数据n承载消息数据的字段校验1从帧头开始对所有字段按字节求和对256取余
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