提出了一种面向工业现场信号采集和对现场设备控制的新型通用一体化RTU的设计方案。介绍了基于ARM9处理器并采用μC/OS_II实时操作系统的RTU系统设计方法，同时对数据传输采用的Modbus通信协议和硬件功能模块的设计进行了描述。-A newly universal design scheme of RTU is introduced, which is applied to signal acquisition and equipment controlon industrial scene. It introduces the design of RTU which is based on ARM9 processor and with real-time operating system μC/OS_II inside.