【摘要】 随着轨道交通综合监控技术的发展,各级监控中心之间数据传输规模不断扩大,现有的通信协议已经成为其性能瓶颈。为了解决这个问题,本文提出了一种MODBUS协议扩展方案,在标准MODBUS协议框架下,扩展应答帧长,定义变化数据基本单元并加入变化传输机制。通过实施本方案,通信应用的网络消耗与CPU负载降低了2个数量级,而可靠性和实时性基本不受影响。更多还原

【Abstract】 With the development of ISCS technology,the existing protocol can not meet the demands of data transmission between the control center at all levels.This paper provides a solution of MODBUS protocol extensions by increasing the packge length and adding the changing data transmission mechanism under the standard MODBUS protocol.By pursueing the solution,the load burden of the network and CPU can be decreased on the order of two while do not affect the real-time and reliability.更多还原