论文提出了一种基于实时操作系统μC/OS-II 和嵌入式ARM 微处理器的Modbus 协议测试系统，介绍了系统的结构和软件设计，实验表明：该系统能满足Modbus 设备的开发调 试以及Modbus 设备运行过程中的在线检测需求，有良好的应用前景。 关键词：Modbus；μC /OS-II；实时操作系统；嵌入式系统 Abstract: This paper introduces a Modbus protocol test system based on μC/OS-II and ARM embedded microprocessor, and describes the structure of the system and software design. The experiments show that the system meets the needs of Modbus devices development debugging and on-line test. Keyword: Modbus, μC/OS-II, real time operating system, embedded system