Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A non-polar transceiver unit and rs-485 communication circuit

A RS-485, transceiver unit technology, applied in the field of communication circuits, can solve problems affecting the efficiency and quality of construction, inability to communicate correctly, and inability to achieve, to facilitate construction, eliminate communication failures, and ensure correctness.

Active Publication Date: 2016-04-20
HISENSE HOME APPLIANCES GRP CO LTD +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in actual engineering, due to various reasons, there will be situations where the two pairs of terminals are connected in reverse, such as figure 2 As shown, the phenomenon that the correct communication cannot be caused
[0004] In general engineering, when figure 2 As shown in the case of wrong wiring, we only need to exchange the two wires at either end. However, in some projects, if we want to change the wiring, the cost is often too high or it is simply impossible to achieve. Seriously Affect the efficiency and quality of construction

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A non-polar transceiver unit and rs-485 communication circuit
  • A non-polar transceiver unit and rs-485 communication circuit
  • A non-polar transceiver unit and rs-485 communication circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] as attached image 3 As shown, a non-polarity transceiver unit includes an RS-485 chip D3 with a communication interface A terminal and a B terminal, an MCU chip D4 capable of detecting the signal phase of its own RXD terminal, the RO terminal of the RS-485 chip D3 and the MCU chip The RXD end of D4 is connected, the DI end of the RS-485 chip D3 is connected with the TXD end of the MCU chip D4, and the P0 of the MCU chip is also connected between the RO end and the RXD end, and between the DI end and the TXD end. The non-polar logic circuit controlled by the 0 terminal is used to transmit the signal correctly when the A terminal and the B terminal of the communication interface of the RS-485 chip are positively connected, and reverse the polarity of the output signal of the RO terminal and the input signal of the DI terminal when the reverse connection is made. The correct transmission of the signal is realized, and at the same time, the RE terminal and the DE terminal ...

Embodiment 2

[0050] as attached Figure 5 As shown, a non-polar transceiver unit includes an RS-485 chip D3 with a communication port A and a B port, and an MCU chip D4 capable of detecting the signal phase of its own RXD port. The RO end of the RS-485 chip D3 is connected to the RXD end of the MCU chip D4, the DI end of the RS-485 chip D3 is connected to the TXD end of the MCU chip D4, and the RE end of the RS-485 chip D3 and the DE end are connected with the P0.1 end of the MCU chip D4. A non-polar logic circuit controlled by the P0.0 terminal of the MCU chip is also connected between the RO terminal and the RXD terminal, and between the DI terminal and the TXD terminal, to reverse the RO when the communication interface of the RS-485 chip is reversed. The output signal of the terminal and the polarity of the input signal of the DI terminal realize the correct transmission of the signal.

[0051] In this embodiment, the RE end and the DE end of the RS-485 chip D3 are all connected with...

Embodiment 3

[0067] as attached Figure 7 As shown, the nonpolar RS-485 communication circuit in this embodiment includes 2 nonpolar transceiver units as shown in embodiment 1 (according to needs, also can be more than 2), and MCU chip D1 and RS-485 chip The signal communication unit composed of D2, the MCU chip D1 and the RS-485 chip D2 are connected in the same way as in Embodiment 1 or 2. The A terminal and B terminal of the communication interface of the RS-485 chip D2 are connected to the RS-485 bus, and the two non-polarity transceiver units are also connected to the RS-485 bus. The correct sending and receiving of signals can be realized whether the A-end and B-end of the communication interface of the two RS-485 chips D3 are wired positively or negatively.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a polarity insensitive transmit-receive unit and an RS-485 communication circuit. The polarity insensitive transmit-receive unit and the RS-485 communication circuit comprise an RS-485 chip with a communication port end A and a communication port end B and an MCU chip which can detect a signal phase of an RXD end of the MCU chip. An RO end of the RS-485 chip is connected with the RXD end of the MCU chip. A DI end of the RS-485 chip is connected with a TXD end of the MCU. A polarity insensitive logic circuit which is controlled by a P0.0 end of the MCU chip is connected between the RO end and the RXD end and between the DI end and the TXD end and used for reversing polarities of an input signal of the DI end and an output signal of the RO end when the communication ports of the RS-485 chip are connected in a reversed mode. As the polarity insensitive logic circuit which is controlled by the MCU chip is connected between the RS-485 and the MCU, communication failures due to faulty wire connection are prevented, correctness of communication signals is ensured, the requirement for craftsmanship of construction staff is reduced, construction efficiency is improved and application is wide.

Description

technical field [0001] The invention relates to the field of communication circuits, more specifically, to a non-polarity transceiver unit and an RS-485 communication circuit. Background technique [0002] RS-485 is an industrial communication interface, which adopts the combination of balanced driver and differential receiver, which has enhanced anti-interference ability, that is, good anti-noise interference and long transmission distance. The maximum transmission distance standard value is 4000 feet, and it can actually reach 3000 feet Meters, the transmission rate is large, the speed can reach 35Mbps in short-distance transmission, and the speed can reach 100kbps in long-distance transmission. Many of the current multi-line systems are interconnected using the RS-485 bus, such as the multi-line digital scroll air-conditioning system, the RS-485 bus connection has polarity requirements, and it cannot be reversed. Ordinary RS-485 communication circuits correct wiring diag...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/003
Inventor 陈坚波鹿红伟
Owner HISENSE HOME APPLIANCES GRP CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com