Electricity metering - Data exchange for meter reading, tariff and load control - Part 21: Direct local data exchange
电测量 - 仪表读数 电价和负载控制的数据交换 - 第21部分:直接本地数据交换
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.