Abstract—The RS485 fieldbus has been widely used in
communication, data collecting and related fields. The stable
communication is the premise of its application. Maximum load,
terminal resistor and bias resistor are three main parameters of
RS485 field bus, which directly influence the stable of 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
offers a theoretical basis for the application of RS485 filed bus
and is very useful in many applications.
Index Terms—Fieldbus, RS485, bias resistor, terminal
resistor.
The authors are with the Faculty of Infrastructure Engineering, Dalian
University of Technology, China. (e-mail:zliangdut@qq.com,
rbliang1984@126.com, zjldlut@dlut.edu.cn).
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Cite:Liang Zhao, Ruobing Liang, and Jili Zhang, "The Solving of Bias Resistor and Its Effect on the RS485 Fieldbus," Journal of Advances in Computer Networks vol. 2, no. 1, pp. 71-75, 2014.
