此文档主要规范了多功能电能表的通信协议，规定了多功能电能表与手持单元（HHU）或其它数据终端设备之间的物理连接、通信链路及应用技术规范。-This document is the physical connection specification multi-function meter communication protocol, provides multi-function meter with a handheld unit (HHU) or other data terminal devices, communication links and application of technical specifications.