一种具有载波检测功能的隔离RS-485电路  

A design of isolated RS-485 interface with carrier sense function

作　　者：薛志波[1] 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200030

出　　处：《电子设计工程》2012年第18期87-89,共3页Electronic Design Engineering

摘　　要：当RS-485用于多主通信的总线系统时,多个主机同时发送数据,将会导致数据冲突。为了避免冲突发生,介绍了一种RS-485电路,用简单硬件实现了总线状态的检测,大大降低了数据冲突概率。另外,为了避免总线上的干扰信号影响系统设备,通常需要实现总线与设备内部电路隔离,为此,文中提出了一种新的RS-485电路隔离方案。In RS-485 bus system with multi host device, data conflict will occur when more than one device send data to bus. To avoid the conflietion, this paper presents a RS-485 interface circuit. Carrier sense function is realized with simple hardware to avoid data conflict on the bus. Furthermore, isolation is essential to prevent interfere from the bus. For this requirement, an isolation design is introduced for isolated RS-485 interface.

关 键 词：RS-485总线 多主通信 载波检测 隔离 ADuM5402 

分 类 号：TP23[自动化与计算机技术—检测技术与自动化装置]