具有硬件CSMA/CD的RS-485总线控制网设计  

The Design of Control Network on RS-485 Bus with CSMA/CD by Hardware

作　　者：徐炜[1] 尤佳[2] 王治祥[2] 

机构地区：[1]温州医学院管理信息学院,温州325027 [2]温州大学信息学院,温州325027

出　　处：《武汉理工大学学报》2003年第8期60-62,70,共4页Journal of Wuhan University of Technology

摘　　要：论述在全双工 RS- 4 85总线控制网中应用硬件电路实现 CSMA/ CD(带冲突检测的载波侦听多址接入 )功能的设计方法。这种方法克服了主从式多址轮询应答方式所带来的轮询周期过长缺点 ,提高了控制网络的实时性。该方法已成功运用于实际应用系统。最后指出了在全双工 RS- 4 85网络上实现对等网通信的方法。This paper discusses the method, which realizes the function of CSMA/CD (Carrier Sense Multiple Access with Collision Detection) on full duplex RS 485 control network by hardware. This method has overcome the weakness of a long polling period which is inherent in the method master servant multiple access roll call polling and has already successfully applied in several real systems. The method, Realizing peer to peer communication on full duplex RS 485 network, is shown in this paper in the end.

关 键 词：载波监听/载波侦听 冲突检测 CSMA/CD RS—485 中继器 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]