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RS485 isolated communication circuit and its control method

A RS485, isolated communication technology, applied in the direction of data exchange, bus network, etc. through path configuration, can solve problems such as the inability to meet RS485 signal isolation requirements, and achieve the effect of avoiding communication confusion and improving stability.

Active Publication Date: 2015-09-09
INVT POWER ELECTRONICS SUZHOU CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] The existing RS485 isolated communication circuit usually uses the RS485 isolated transceiver alone for signal isolation communication. During the isolated communication process, the RS485 isolated transceiver receives the RS485 signal, and transmits the TTL signal after isolation. Although the isolation communication method can achieve the isolation effect, it cannot meet the isolation requirements of the RS485 signal in the true sense, that is, the input and output are both RS485 signals

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  • RS485 isolated communication circuit and its control method
  • RS485 isolated communication circuit and its control method
  • RS485 isolated communication circuit and its control method

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Embodiment Construction

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention, and similar component numbers in the drawings represent similar components. Apparently, the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0022] refer to Figure 1 to Figure 3 , The RS485 isolated communication circuit of the present invention includes an RS485 isolated transceiver 1, an RS485 transceiver 2 and a control module 3. Among them, RS485 isolated transceiver 1 is used to realize the isolation conversion between RS485 signal and TTL signal; Convert the opposite signal conversion; the contro...

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Abstract

The invention discloses an RS485 isolated communication circuit. The RS485 isolated communication circuit comprises an RS485 isolated transceiver, an RS485 transceiver and a control module, wherein the RS485 isolated transceiver is used for realizing isolated conversion between an RS485 signal and a TTL (Transistor-Transistor Logic) signal, the RS485 transceiver is used for realizing signal conversion opposite to the signal conversion carried out by the RS485 isolated transceiver, and the control module is connected between the RS485 transceiver and the RS485 isolated transceiver to control the transceiving states of the RS485 isolated transceiver and the RS485 transceiver. The RS485 isolated communication circuit provided by the invention adopts the control module for controlling the receiving and transmitting actions of the RS485 isolated transceiver and the RS485 transceiver so as to realize stable RS485 isolated communication in the true sense. Simultaneously, the invention also discloses a control method for the RS485 isolated communication circuit.

Description

technical field [0001] The present invention relates to an isolated communication circuit, in particular to an RS485 isolated communication circuit. Background technique [0002] RS485 is the most widely used serial interface in the PC and communication industry, and is defined as a single-ended standard that increases the communication distance in low-speed serial communication. In a strong interference environment, the method of isolating RS485 can improve the anti-interference ability of the system. Therefore, in the communication circuit, for example, in the data communication transmission between the host computer and DSP, it is usually necessary to use the RS485 isolation communication circuit to realize the RS485 signal. isolated communication. [0003] The existing RS485 isolated communication circuit usually uses the RS485 isolated transceiver alone for signal isolation communication. During the isolated communication process, the RS485 isolated transceiver receive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/40
Inventor 熊文
Owner INVT POWER ELECTRONICS SUZHOU CO LTD
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