大连理工大学学报Issue(4)：393-398,6.DOI:10.7511/dllgxb201504009
提高 RS485总线通信可靠性的优化设计方法
Optimized design method for enhancing reliable communication of RS485 fieldbus
摘要
Abstract
The equivalent circuit model of RS485 fieldbus is established based on three key parameters as research objectives,which are bias resistor,terminal resistor and number of network nodes.The value range of bias resistor on the fieldbus is 556-71 6 Ω,which is determined by using the law of KCL and current-limiting method.Furthermore,the influences of bias resistor on the terminal resistor and number of network nodes are analyzed.The best value of about 670 Ω for bias resistor is derived for different unit loads,and the corresponding maximum number of network nodes of fieldbus is determined too.The research results can provide theoretical basis and engineering design guidance for the application of RS485 fieldbus.关键词
RS485 总线/偏置电阻/终端电阻/优化设计Key words
RS485 fieldbus/bias resistor/terminal resistor/optimized design分类
信息技术与安全科学引用本文复制引用
赵亮,张吉礼..提高 RS485总线通信可靠性的优化设计方法[J].大连理工大学学报,2015,(4):393-398,6.基金项目
中国博士后科学基金资助项目(2015M571306) （2015M571306）
