基于脉冲变压器的总线式RS485隔离器

摘要

In order to simplify the design, proposes the bus type RS485 isolation coupler based on the pulse transformer. This plan's characteristics are simple, practical, do not need the power source, not to need to consider the data direction, the automatic adaptation limited range baud rate, the RS485 network user community understand easily and the control, and so on. In the article has publicized the basic experiment electric circuit and the pulse transformer's main design basis. Especially under the industry environment, this plan can improve the half-duplex A, B the two-wire system RS485 communications network. Its basic philosophy is also suitable for full-duplex W, X, Y, Z the four-wire system RS485/RS422 communications network.%为简化总线式RS485隔离器的设计，提出基于脉冲变压器的总线式RS485隔离器的技术方案。该方案具有简单实用、无需电源、无需考虑数据流向、在有限范围内波特率自适应、底层用户群体易于理解和掌控等特点。给出了基本实验电路和脉冲变压器的主要设计依据。基于脉冲变压器的总线式RS485隔离器．尤其适合工业环境下半双工的A、B两线制RS485通信网的升级改造，其基本思想也适用于全双工的W、X、Y、Z四线制RS485／RS422通信网。