ICS 35.240.60 CCS M 21 YD 中华人民共和国 通信行业标准 YD/T XXXX —XXXX 基于NB-IoT的智能水表系统 终端接口技术要求 Terminal interface technical requirements of smart water meter system based on NB- IoT （报批稿） XXXX - XX - XX发布 XXXX - XX - XX实施 中华人民共和国工业和信息化部   发 布 YD/T XXXX—XXXX 目 次 前 言 ....................................................................................................................................................... I 1 范围 .................................................................................................................................................. 2 2 规范性引用文件 ............................................................................................................................... 2 3 术语和定义 ....................................................................................................................................... 2 4 缩略语 ............................................................................................................................................... 2 5 系统架构 ........................................................................................................................................... 3 6 终端技术要求 ................................................................................................................................... 3 6.1 工作原理 ................................................................................................................................... 3 6.2 功能接口 ................................................................................................................................... 4 6.3 一次抄读成功率 ....................................................................................................................... 4 6.4 日抄读成功率 ........................................................................................................................... 5 7 安全要求 ........................................................................................................................................... 5 7.1 密钥管理 ................................................................................................................................... 5 7.2 通信安全 ................................................................................................................................... 5 8 通信协议 ........................................................................................................................................... 8 8.1 通信方式 ................................................................................................................................... 8 8.2 传输规则 ................................................................................................................................... 8 8.3 帧结构 ....................................................................................................................................... 8 8.3.1 终端至平台 ........................................................................................................................... 8 8.3.2 平台至终端 ........................................................................................................................... 9 9 应用协议 ........................................................................................................................................... 9 9.1 实时数据（上行指令） ........................................................................................................... 9 9.2 参数设置（下行指令） ......................................................................................................... 11 9.3 信息查询 ................................................................................................................................. 12 9.4 即时告警 ................................................................................................................................. 12 9.5 透传指令 ..................................................................