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