链式拓扑结构RS422总线的失效性分析  

Failure Analysis of RS422 Bus with Chain-type Topology

作　　者：樊彦恩[1,2] 段玲琳 李化雷[1,2] 

机构地区：[1]中国电子科技集团第三十八研究所,合肥230088 [2]孔径阵列与空间探测安徽省重点实验室,合肥230088

出　　处：《火控雷达技术》2017年第3期43-46,共4页Fire Control Radar Technology

摘　　要：从理论方面给出了链式拓扑结构RS422总线接口电路总负载阻抗计算方法;从试验方面测试分析了当某接收端短路失效时,驱动芯片和其他接收端的通信质量。试验证明,只要保证总负载阻抗R_L不小于90欧姆,某接收端短路失效并不会影响驱动芯片和其他接收端的正常通信,试验结果与理论分析一致。Calculating method of total resistance of RS422 bus with chain-type topology is present theoretically. Based on experiment,communication quality between drive chip and other receiving ends in case of any one receiving end is failed due to short-circuit is analyzed. The experimental result shows that,if total load impedance RL not less than 90 can be guaranteed,then communication quality between drive chip and other receiving ends will not be affected in case of one end is failed due to short-circuit,i. e. experimental result is coincident with theoretical analyzing.

关 键 词：RS422总线 负载阻抗 失效性分析 链式拓扑结构 

分 类 号：TN919.3[电子电信—通信与信息系统]