标准摘要
[中文适用范围]： IEC 62056 的这一部分描述了本地仪表数据交换的硬件和协议规范。在此类系统中，手持单元（HHU）或具有同等功能的单元连接到资费设备或一组设备。连接方式可以是 [外文原描述]： Describes hardware and protocol specifications for local meter data exchange. In such systems, a hand-held unit (HHU) or a unit with equivalent functions is connected to a tariff device or a group of devices. This publication is of high relevance for Smart Grid .
英文名称Electricity metering - Data exchange for meter reading, tariff and load control - Part 21: Direct local data exchange