本文档规定了DNP3协议结构、功能和可互操作的应用程序选项（子集级别）。指定的子集级别定义了每个设备中实现的功能。最简单的级别用于基本设备。更高级的级别支持增加功能。该协议适用于与大多数电力通信系统组成一致的各种通信介质上的操作。

This document specifies the DNP3 protocol structure, functions, and interoperable application options (subset levels). The specified subset level defines the functionality implemented in each device. The simplest level is intended for basic devices. More advanced levels support increasing functionality. The protocol is suitable for operation on a variety of communication media consistent with the makeup of most electric power communication systems.