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.
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
