CN206259933U - A kind of RS485 communication links for carrying isolation - Google Patents
A kind of RS485 communication links for carrying isolation Download PDFInfo
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- CN206259933U CN206259933U CN201621347985.6U CN201621347985U CN206259933U CN 206259933 U CN206259933 U CN 206259933U CN 201621347985 U CN201621347985 U CN 201621347985U CN 206259933 U CN206259933 U CN 206259933U
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- transceivers
- chip microcomputer
- xor gate
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Abstract
The utility model discloses a kind of RS485 communication links for carrying isolation,Including single-chip microcomputer,XOR gate,RS485 transceivers,Shielded Twisted Pair,The TXD of the single-chip microcomputer,RXD interfaces are respectively at the TXD with RS485 transceivers,RXD interfaces are connected,The P1.0 of single-chip microcomputer,P1.1 interfaces are connected with the input of XOR gate,The output end of the XOR gate is connected with the DE/RE interfaces of RS485 transceivers,The A of RS485 transceivers,B ports connect Shielded Twisted Pair,The utility model compares prior art,Employ the RS485 transceivers for carrying isolation,Simplify circuit design,Enhance the stability and reliability of circuit,RS485 transceivers are controlled by XOR,Prevent from hanging communication bus when single chip microcomputer halt or reset state,Ensure the proper communication of other faultless communication nodes in network.
Description
Technical field
The utility model is related to electronic information field, relates generally to a kind of RS485 communication links for carrying isolation.
Background technology
In Industry Control occasion, RS485 communication bus is simple because of its interface, and networking is convenient, the features such as long transmission distance and
It is used widely.The main half-duplex network of network of RS485 interfaces composition, the transmission of usually two line differential balances, order wire
Transmitted using Shielded Twisted Pair more than cable.This mode of connection is bus type topological structure, can at most be mounted on same bus
32 communication nodes.The host tape multiple slave of master-slave communication mode, i.e., one is generally adopted by RS485 communication networks.
As shown in Fig. 2 in many cases, simply simply with a pair of twisted-pair feeders by each interface during connection RS-485 communication links
" A ", " B " end couple together, and constitute a small-sized communication LAN.This mode is simple, applicable, but there is also one it is fatal
Defect：When RS485 transceivers DE/RE is in high level all the time, RS485 transceivers will all the time be in transmission state, in master
From communication network, when certain node is in transmission state all the time, there is the risk of whole network " being hung ".
Therefore, prior art has yet to be improved and developed.
Utility model content
In view of above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of RS485 for carrying isolation to lead to
Letter link, it is intended to solve it is existing when in LAN a certain equipment occur crashing or when communication interface breaks down, exist whole
The problem of individual network " being hung ".
The technical solution of the utility model is as follows：
The utility model discloses a kind of RS485 communication links for carrying isolation, wherein, including single-chip microcomputer, XOR gate,
RS485 transceivers, Shielded Twisted Pair, TXD, RXD interface of the single-chip microcomputer connect respectively at TXD, the RXD with RS485 transceivers
Mouth connection, P1.0, P1.1 interface of single-chip microcomputer is connected with the input of XOR gate, the output end and RS485 of the XOR gate
The DE/RE interfaces connection of transceiver, A, B port connection Shielded Twisted Pair of RS485 transceivers.
A kind of RS485 communication links for carrying isolation, wherein, described RS485 transceivers are that the RS485 for carrying isolation is received
Hair device.
Beneficial effect：The utility model compares prior art, employs the RS485 transceivers for carrying isolation, simplifies electricity
Road is designed, and enhances the stability and reliability of circuit.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is prior art schematic diagram.
Marked in figure：10th, single-chip microcomputer；20th, XOR gate；30th, RS485 transceivers；40th, Shielded Twisted Pair.
Specific embodiment
The utility model provides a kind of RS485 communication bus for carrying isolation, to make the purpose of this utility model, technical side
Case and effect are clearer, clear and definite, and the utility model is further described below.It should be appreciated that tool described herein
Body embodiment is only used to explain the utility model, is not used to limit the utility model.
The utility model provide a kind of RS485 communication bus for carrying isolation, it include single-chip microcomputer 10, XOR gate 20,
RS485 transceivers 30 and Shielded Twisted Pair 40, TXD, RXD interface of the single-chip microcomputer 10 and TXD, RXD of RS485 transceivers 30
Interface is connected, and P1.0, P1.1 interface of single-chip microcomputer 10 is connected with the input 20 of XOR gate, the output end of XOR gate 20 and
The DE/RE interfaces connection of RS485 transceivers 30, A, B port connection Shielded Twisted Pair of RS485 transceivers 30, specifically, such as schemes
Shown in 1.
Preferably, RS485 transceivers 30 simplify circuit design using the RS485 transceivers for carrying isolation, strengthen circuit
Stability and reliability.
Preferably, single-chip microcomputer 10 is connected by XOR gate 20 with RS485 transceivers 30, when single-chip microcomputer 10 will receive data,
XOR door operation P1.0=0 and P1.1=0 or P1.0=1 and P1.1=1（I.e. the DE/RE interfaces of RS485 transceivers are low level）；It is single
When piece machine 10 sends data, XOR door operation P1.0=0 and P1.1=1 or P1.0=1 and P1.1=0, when level is different, then XOR gate
Output high level（I.e. the DE/RE interfaces of RS485 transceivers are high level）.When single-chip microcomputer 10 crashes, P1.0=1 and P1.1=1（I.e.
P1.0 interfaces and P1.1 interfaces are in high level state, XOR gate output low level, and the DE/RE interfaces of RS485 transceivers are
Low level state）, so may insure that RS485 transceivers 30 are in when single-chip microcomputer 10 crashes and receive data mode.Work as RS485
Transceiver 30 is in when receiving data mode, externally in high-impedance state, does not interfere with the normal work of whole link.
A kind of RS485 communication links for carrying isolation that the utility model is provided, are received and dispatched using the RS485 for carrying isolation
Device, it is different from the RS485 transceivers that prior art is used, the design of telecommunication circuit is simplified, it is different by two I/0 mouthfuls of single-chip microcomputer
Or rear control carries the RS485 transceivers of isolation, manipulates single-chip microcomputer output level, make RS485 transceivers in single chip microcomputer halt
Hanging for whole piece circuit can be prevented in data mode is received, it is ensured that network proper communication.
It should be appreciated that application of the present utility model is not limited to above-mentioned citing, those of ordinary skill in the art are come
Say, can according to the above description be improved or converted, all these modifications and variations should all belong to the appended power of the utility model
The protection domain that profit is required.
Claims (2)
1. a kind of RS485 communication links for carrying isolation, it is characterised in that including single-chip microcomputer, XOR gate, RS485 transceivers, screen
Twisted-pair feeder is covered, TXD, RXD interface of the single-chip microcomputer are connected respectively at TXD, RXD interface with RS485 transceivers, single-chip microcomputer
P1.0, P1.1 interface are connected with the input of XOR gate, and output end and the DE/RE of RS485 transceivers of the XOR gate connect
Mouth connection, A, B port connection Shielded Twisted Pair of RS485 transceivers.
2. a kind of RS485 communication links for carrying isolation according to claim 1, it is characterised in that described RS485 is received
Hair device is the RS485 transceivers for carrying isolation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621347985.6U CN206259933U (en) | 2016-12-09 | 2016-12-09 | A kind of RS485 communication links for carrying isolation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621347985.6U CN206259933U (en) | 2016-12-09 | 2016-12-09 | A kind of RS485 communication links for carrying isolation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206259933U true CN206259933U (en) | 2017-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621347985.6U Active CN206259933U (en) | 2016-12-09 | 2016-12-09 | A kind of RS485 communication links for carrying isolation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114650077A (en) * | 2020-12-17 | 2022-06-21 | 航天科工惯性技术有限公司 | Communication circuit of transmitting-receiving self-control RS485 interface |
-
2016
- 2016-12-09 CN CN201621347985.6U patent/CN206259933U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114650077A (en) * | 2020-12-17 | 2022-06-21 | 航天科工惯性技术有限公司 | Communication circuit of transmitting-receiving self-control RS485 interface |
| CN114650077B (en) * | 2020-12-17 | 2023-07-14 | 航天科工惯性技术有限公司 | Communication circuit of receiving and transmitting self-control RS485 interface |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Three, building six, building 7, building 17, block A, Han Tian science and Technology City, Guicheng Road, Nanhai District, Foshan, Guangdong, 528200 Patentee after: Guangdong Keruide Electric Technology Co., Ltd. Address before: Three, building six, building 7, building 17, block A, Han Tian science and Technology City, Guicheng Road, Nanhai District, Foshan, Guangdong, 528200 Patentee before: FOSHAN CREDIBLE ELECTRIC TECHNOLOGY CO., LTD. |