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Modbus是一种开放的、标准的现场总线通信协议,是世界自动化领域中普遍使用的协议之一。本文设计了Modbus实验系统,给出了该系统功能描述及硬件原理框图,建立了软件分层模型,并通过实例描述了系统节点的程序设计思想和设计流程。
Modbus is an open, standard fieldbus communication protocol that is one of the most commonly used protocols in the world of automation. In this paper, the Modbus experimental system is designed. The functional description of the system and the block diagram of the hardware are given. The software layered model is established. The program design idea and design flow of the system node are described by examples.