DNP3通信协议文档（英文）

简介：
本文档详细介绍了DNP3通信协议的标准与规范，涵盖数据传输、控制指令及安全机制等内容，适用于电力系统自动化领域。 DNP3 (Distributed Network Protocol 3) is a communication protocol designed for use in industrial automation and control systems. It facilitates the exchange of data between intelligent electronic devices, such as remote terminal units (RTUs), programmable logic controllers (PLCs), and energy management systems. The DNP3 protocol supports both master-slave and peer-to-peer network configurations. In a master-slave setup, one device acts as the master while multiple other devices function as slaves. The master initiates communication by polling slave devices for data or sending commands to them. Conversely, in a peer-to-peer configuration, any device can initiate communication with another. DNP3 is built on top of TCP/IP and supports both asynchronous serial (RS-232/485) and Ethernet transport layers. This flexibility allows it to be used across various network environments and hardware platforms. The protocol includes features such as binary input/output, analog input/output, control functions, event logging, time synchronization, and configuration management. Security is also an important aspect of DNP3 communication. It provides mechanisms for data integrity verification through cyclic redundancy checks (CRC) and supports authentication methods to ensure secure communication between devices. Overall, the DNP3 protocol offers a robust solution for industrial automation systems requiring reliable and efficient data exchange among networked devices.