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RS-485 signal line polarity self-adaption implementation device based on double UART

A RS-485 and RS485 technology, applied in the field of dual UART-based RS-485 signal line polarity self-adaptive implementation device, can solve problems such as errors and wasted man-hours, and achieve the effect of convenient procurement and fast wiring

Pending Publication Date: 2021-12-24
鸣志电器(太仓)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is also more commonly used, but often errors
In order to prevent wrong connection, it is necessary to check after wiring, which is a waste of man-hours

Method used

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  • RS-485 signal line polarity self-adaption implementation device based on double UART
  • RS-485 signal line polarity self-adaption implementation device based on double UART
  • RS-485 signal line polarity self-adaption implementation device based on double UART

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Embodiment Construction

[0042]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0043] The invention is a dual-UART-based RS-485 signal line polarity self-adaptive realization device, which supports the exchange of RS-485 signals A and B, and solves the trouble caused by reverse connection. When the present invention is adopted, the two communication lines A and B of RS-485 may not be distinguished, and the judgment is made by the MCU. The present invention adopts two-way UARTs to receive, one UART uses forward reception, and the other...

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Abstract

The invention relates to an RS-485 signal line polarity self-adaption implementation device based on double UARTs, which comprises an RS485 transceiver and an MCU, and further comprises a conversion circuit for receiving an RS-485 reversed polarity signal, and the conversion circuit is connected between one UART of the double UARTs and the RS-485 transceiver. Compared with the prior art, the invention has the advantages of fast wiring, time saving, labor saving and the like.

Description

technical field [0001] The invention relates to an RS-485 bus, in particular to an RS-485 signal line polarity self-adaptive realization device based on dual UARTs. Background technique [0002] RS-485 bus is a common communication line, which is widely used in instrumentation, lighting and other industries. In general applications, the RS-485 signal is converted through a transceiver and CMOS signal or TTL signal, and then connected to the MCU. When wiring the actual RS-485 control system, if the two signal lines A and B are reversed, normal communication will not be possible. However, the on-site wiring is generally not connected with electricity, and the problem can only be found after the power is turned on. In this way, if it is wrongly connected, it will be corrected after power off again, which is very troublesome. [0003] In actual practice, MCU is often used for RS-485 communication. Since RS-485 uses differential signals for transmission, while ordinary MCUs u...

Claims

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Application Information

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IPC IPC(8): G06F13/38
CPCG06F13/385
Inventor 王旭陈小红
Owner 鸣志电器(太仓)有限公司