【摘要】 为了克服传统仪表通讯技术传输距离短、实时性差、容错率低等缺点,提出一种基于MSP430F149单片机和Modbus-RTU协议的智能仪表通讯解决方案。阐述了Modbus-RTU协议的基本规范,对通信数据的接收、解析、校验、打包、发送等原理进行详细地分析,并对其硬件和软件的实现方法进行了详细介绍。通过协议测试软件Mod Scan32验证了该设计方案的可行性和稳定性。实践证明,采用MSP430系列单片机开发的现场总线技术以其低功耗、可靠、经济实用的特点在智能仪表系统中有着良好的应用前景。更多还原

【Abstract】 In order to overcome the shortcomings of traditional instrument,such as short distance,poor realtime and little fault tolerance,a scheme is proposed to solve the problem about the communication of intelligent instrument,which is based on MSP430F149 MCU and Modbus- RTU protocol. The essential nature of the modbus-RTU protocol is expounded in detail,and the principles about data frames which include receiving,analysis,verification,packing and sending are introduced. In addition,the hardware and the software implementation of this scheme are also presented. The feasibility and stability of the design are verified by protocol testing software Mod Scan32. The practice proves that the field bus technology based on MSP430 series MCU has a good application prospect in the domain of intelligent instrument system on account of its low-energy,reliable,economical and practical characteristics.更多还原