RS485总线几个关键参数的理论研究  

Theoretical Study on Key Parameters of RS485 Field Bus

作　　者：赵亮[1] 

机构地区：[1]大连理工大学建设工程学部,大连116024

出　　处：《单片机与嵌入式系统应用》2014年第6期14-17,共4页Microcontrollers & Embedded Systems

摘　　要：最大负载、终端电阻、偏置电阻是感知层RS485总线的3个关键参数,本文通过建立RS485总线的等效电路模型,采用电流流向法对偏置电阻的理论值进行求解,进而分析了其对总线最大负载和终端电阻的影响,为RS485总线的应用提供了理论基础,具有很高的实用价值。Maximum load,terminal resistor and bias resistor are three main parameters of RS485 field bus,which directly influence the stability of the system.This paper adopts the current flow method to solve the theoretical value of bias resistor based on the equivalent circuit model of RS485 field bus,and further analyzes the influence on the maximum load and terminal resistor.The research result of-fers a theoretical basis for the application of RS485 filed bus and is very useful in many applications.

关 键 词：现场总线 RS485 偏置电阻 终端电阻 

分 类 号：TP336[自动化与计算机技术—计算机系统结构]