基于变波特率的RS485消防车检测系统的设计*

作者：王冠凌，周 力，陈 曦，凌海波 日期：2008-04-23/span> 浏览：3347 查看PDF文档

基于变波特率的RS485消防车检测系统的设计*
王冠凌，周 力，陈 曦，凌海波
（安徽工程科技学院 安徽省电气传动与控制重点实验室，安徽 芜湖 241000）

摘 要：介绍了用于消防车的分布式检测系统中设计与实现的RS485网络。该系统由上、下位机构成，下位机包括有流量、压力、温度、转矩、转速、功率等参数检测的12块仪表,提出了一种应用于中小型分布式实时检测系统的变波特率RS485主从式总线结构，解决了传统主从式通信方式的通信阻塞问题，并详细阐明了该方法的实现过程，给出了上、下位机之间的通信协议。为RS485网络的设计与实现、设备升级等应用提供了一种有效的思路，具有良好的应用前景。
关键词：消防车;变波特率;RS485;通信协议

Design of RS485 fire truck detection system based on baud rate change
WANG Guanling, ZHOU Li, CHEN Xi, LING Haibo
(Anhui University of Technology and Science, Anhui Provincial Key Laboratory of Electric and Control, Wuhu 241000, China)

Abstract:The RS485 network used in fire truck distribution automatic detection system was introduced. The system is constituted of host computer and slave computer. The slave computer includes 12 meters which are used in parameters detection including flow, pressure, temperature, torque, speed, power, etc. A baud rate change RS485 masterslave bus architecture applied in the SMEs distribution detection system was proposed. The communication obstruction problem of traditional masterslave communication was solved and the method of achieving complete process was clarified. Finally, a communication protocol between host computer and slave computer was given. The research shows that the system provides an effective idea for the design and realization of RS485 network, and it has a good prospect.
Key words: fire truck; baud rate change; RS485; communication protocol

参考文献(Reference):
［1］吴军辉,林开颜,徐立鸿.RS485总线通信避障及其多主发送的研究［J］.测控技术,2002(8):41-43.
［2］庄 致,郭 胜.基于RS485总线的串口令牌环通信的研究［J］.微计算机信息,2007,23(10):225-227.
［3］吴忻生,陈 安.一种实现载波监听多点接入/冲突检测的多主RS485总线［J］.电子技术应用,2004，30(2):48-50.
［4］胡汉才.单片机原理及其接口技术:第2版［M］.北京:清华大学出版社,2004.
［5］MAXIM. Microcontroller Recognizes Addresses in RS485 Systems［EB/OL］.［2002-03-01］. http://www.maximic.com/appnotes.cfm/ an_pk /1063.
［6］MAXIM. New RS485 IC Increases System Reliability and Fault Detection in MotorControl Circuits ［EB/OL］.［2001-04-01］. http: //www.maximic.com/appnotes.cfm/an_pk/578.
［7］朱宏超,于向军,吕震中.Modbus协议在智能数据集系统中的应用［J］．测控技术,2006,25(2):65-70.
［8］梅 锐,牟永敏.基于Modbus协议的自动化备之间通信实现［J］．北京机械工业学院学报，2006,21(1):43-46.
［9］邱长丰.基于RS485总线的网络化测试系统若干关键技术研究［D］.哈尔滨:哈尔滨工业大学电气工程及自动化学院,2006.