提出了一套基于Modbus协议的总线控制系统，分析了Modbus协议的特点，介绍了Modbus协议的内容及通信过程，给出了系统的软件实现方法，包括系统流程图及部分校验代码。-Proposed a set of protocols based on Modbus bus control system, analysis of the characteristics of the Modbus protocol, Modbus protocol describes the content and communication process, given the system' s software implementation methods, including the system flow chart and some validation code.