| 赵亮,张吉礼.提高RS485总线通信可靠性的优化设计方法[J].,2015,55(4):393-398 |
| 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 |
| |
| DOI：10.7511/dllgxb201504009 |
| 中文关键词: RS485总线 偏置电阻 终端电阻 优化设计 |
| 英文关键词: RS485 fieldbus bias resistor terminal resistor optimized design |
| 基金项目:中国博士后科学基金资助项目(2015M571306). |
|
| 摘要点击次数: 1230 |
| 全文下载次数: 2932 |
| 中文摘要: |
| 以RS485总线的偏置电阻、终端电阻、网络节点数量3个关键参数为研究对象，建立了等效电路模型．利用KCL定律和限流法确定了总线偏置电阻的取值范围为556~716 Ω，进一步分析了偏置电阻对终端电阻以及网络节点数量的影响，得到了不同单位负载对应的偏置电阻最佳取值约为670 Ω，并确定了对应的总线最大网络节点数量．研究结果可为RS485总线应用提供理论基础和工程设计指导． |
| 英文摘要: |
| 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 556-716 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. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |