CN109376109A - Multiple serial communication switching device - Google Patents
Multiple serial communication switching device Download PDFInfo
- Publication number
- CN109376109A CN109376109A CN201811502996.0A CN201811502996A CN109376109A CN 109376109 A CN109376109 A CN 109376109A CN 201811502996 A CN201811502996 A CN 201811502996A CN 109376109 A CN109376109 A CN 109376109A
- Authority
- CN
- China
- Prior art keywords
- data
- conversion chip
- mcu
- door
- control terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004891 communication Methods 0.000 title claims abstract description 55
- 238000006243 chemical reaction Methods 0.000 claims abstract description 67
- 230000000694 effects Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
- G06F13/4286—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus using a handshaking protocol, e.g. RS232C link
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4004—Coupling between buses
- G06F13/4022—Coupling between buses using switching circuits, e.g. switching matrix, connection or expansion network
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0002—Serial port, e.g. RS232C
Abstract
The present invention provides a kind of multiple serial communication switching device, including MCU, data input-switching circuit, data transmit-receive control circuit, RS232 conversion chip U5, RS485/422 conversion chip U3 and U4；Each input terminal of data input-switching circuit is separately connected the RXD data output end of the RXD data output end of RS232 conversion chip U5, RS485/422 conversion chip U3；The RXD data port of the output end connection MCU of data input-switching circuit；MCU realizes the received switching of RS232/RS485/RS422 serial port communication data by the control to data input-switching circuit；RS485/422 conversion chip U3 is used for the data transmit-receive of RS485 serial communication, and U3 doubles as the data receiver of RS422 serial communication, and data of the RS485/422 conversion chip U4 for RS422 serial communication are sent；MCU realizes the control to RS485/422 conversion chip U3, U4 by control terminal and data transmit-receive control circuit.The present invention is flexible and convenient to use.
Description
Technical field
The present invention relates to industrial communication technical field, especially a kind of multiple serial communication switching device.
Background technique
In the prior art, multiple serial communication RS232, RS485, RS422 cannot access circuit and the RXD number of MCU simultaneously
Mutual serious interference when being communicated, while accessed according to port and TXD data port, data are unable to normal transmission, tradition
Method needs manual each serial communication route of off and on, inconvenient for operation and cumbersome.
Summary of the invention
It is an object of the present invention to overcome the shortcomings of the prior art and provide a kind of switchings of multiple serial communication to fill
It sets, can be realized the automatic switchover of multiple serial communication, flexible and convenient to use, circuit is simple and practical.The technology that the present invention uses
Scheme is:
A kind of multiple serial communication switching device, including MCU, data input-switching circuit, data transmit-receive control circuit, RS232
Conversion chip U5, RS485/422 conversion chip U3 and U4；
Each input terminal of data input-switching circuit is separately connected RXD data output end, the RS485/ of RS232 conversion chip U5
The RXD data output end of 422 conversion chip U3；The RXD data port of the output end connection MCU of data input-switching circuit；MCU
By the control to data input-switching circuit, the received switching of RS232/RS485/RS422 serial port communication data is realized；
RS485/422 conversion chip U3 is used for the data transmit-receive of RS485 serial communication, and MCU passes through control terminal and data transmit-receive control
Circuit control RS485/422 conversion chip U3 processed carries out the data transmit-receive of RS485 serial communication；The TXD data port of MCU is distinguished
Connect the TXD data input pin of RS232 conversion chip U5, TXD data input pin, the RS485/ of RS485/422 conversion chip U3
The TXD data input pin of 422 conversion chip U4；
RS485/422 conversion chip U3 doubles as the data receiver of RS422 serial communication, and RS485/422 conversion chip U4 is used for
The data of RS422 serial communication are sent；MCU is realized by control terminal and data transmit-receive control circuit converts core to RS485/422
The control of piece U3, U4.
Specifically, data input-switching circuit includes and door U1A, U1B or door U2A, U2B；
With the RXD data output end of the A input termination RS232 conversion chip U5 of door U1A, the B input with door U1A terminates MCU's
RS232 control terminal, with the Y output termination of door U1A or the A input terminal of door U2A；Or A input terminal and B the input terminal difference of door U2B
Meet the enable end EN485 of MCU and the A input terminal of RS422 control terminal or Y the output termination and door U1B of door U2B, the B with door U1B
The RXD data output end of input termination RS485/422 conversion chip U3 is inputted with the Y output termination of door U1B or the B of door U2A
End；Or the RXD data port of the Y output termination MCU of door U2A.
Specifically, data transmit-receive control circuit includes and door U1C；It is controlled with the RS485 of the A input termination MCU of door U1C
End, the enable end EN485 with the B input termination MCU of door U1C, with the output termination RS485/422 conversion chip U3's of door U1C
It receives control terminal and sends control terminal；
The reception control terminal of RS485/422 conversion chip U4 connects high level, the hair of RS485/422 conversion chip U4 by resistance R2
Send the RS422 control terminal of control termination MCU；
The reception control terminal of RS485/422 conversion chip U3, U4 are all that low level is effective, and sending control terminal is all that high level has
Effect.
Further,
When the signal of the RS232 control terminal of MCU, RS485 control terminal, RS422 control terminal, the enable end EN485 is respectively 1,0,0,0
When, it is switched to RS232 serial communication；
When the signal of the RS232 control terminal of MCU, RS422 control terminal, the enable end EN485 is respectively 0,0,1, it is switched to RS485 string
Port communications；The data transmit-receive of the signal control RS485 serial communication of the RS485 control terminal of MCU；
When the signal of the RS232 control terminal of MCU, RS485 control terminal, RS422 control terminal, the enable end EN485 is respectively 0,0,1,0
When, it is switched to RS422 serial communication.
The present invention has the advantages that
1) facilitate the intelligence for carrying out tri- kinds of signals of RS232, RS485, RS422 to automatically switch, can also be set as single by MCU
Communication pattern, it is flexible and convenient to use.
2) circuit is simple and practical, at low cost.
Detailed description of the invention
Fig. 1 is electrical diagram of the invention.
Fig. 2 is the principle of the present invention figure.
Specific embodiment
Below with reference to specific drawings and examples, the invention will be further described.
As shown in Figure 1, a kind of multiple serial communication switching device proposed by the present invention, including MCU, data input switching electricity
Road, data transmit-receive control circuit, RS232 conversion chip U5, RS485/422 conversion chip U3 and U4；
Each input terminal of data input-switching circuit is separately connected RXD data output end, the RS485/ of RS232 conversion chip U5
The RXD data output end of 422 conversion chip U3；The RXD data port of the output end connection MCU of data input-switching circuit；MCU
By the control to data input-switching circuit, the received switching of RS232/RS485/RS422 serial port communication data is realized；
RS485/422 conversion chip U3 is used for the data transmit-receive of RS485 serial communication, and MCU passes through control terminal and data transmit-receive control
Circuit control RS485/422 conversion chip U3 processed carries out the data transmit-receive of RS485 serial communication；The TXD data port of MCU is distinguished
Connect the TXD data input pin of RS232 conversion chip U5, TXD data input pin, the RS485/ of RS485/422 conversion chip U3
The TXD data input pin of 422 conversion chip U4；
RS485/422 conversion chip U3 doubles as the data receiver of RS422 serial communication, and RS485/422 conversion chip U4 is used for
The data of RS422 serial communication are sent；MCU is realized by control terminal and data transmit-receive control circuit converts core to RS485/422
The control of piece U3, U4.
As shown in Fig. 2, data input-switching circuit includes and door U1A, U1B or door U2A, U2B；
With the RXD data output end of the A input termination RS232 conversion chip U5 of door U1A, the B input with door U1A terminates MCU's
RS232 control terminal, with the Y output termination of door U1A or the A input terminal of door U2A；Or A input terminal and B the input terminal difference of door U2B
Meet the enable end EN485 of MCU and the A input terminal of RS422 control terminal or Y the output termination and door U1B of door U2B, the B with door U1B
The RXD data output end of input termination RS485/422 conversion chip U3 is inputted with the Y output termination of door U1B or the B of door U2A
End；Or the RXD data port of the Y output termination MCU of door U2A；
Data transmit-receive control circuit includes and door U1C；The RS485 control terminal that MCU is terminated with the A input of door U1C, the B with door U1C
The enable end EN485 of input termination MCU, reception control terminal and hair with the output termination RS485/422 conversion chip U3 of door U1C
Send control terminal；
The reception control terminal of RS485/422 conversion chip U4 connects high level, the hair of RS485/422 conversion chip U4 by resistance R2
Send the RS422 control terminal of control termination MCU；
The reception control terminal (2 feet of U3, U4 in Fig. 2) of RS485/422 conversion chip U3, U4 are all that low level is effective, are sent
Control terminal (3 feet of U3, U4 in Fig. 2) is all that high level is effective；The A of RS485/422 conversion chip U3, B interface end can be used as
The sending and receiving end of RS485 serial communication also can be used as the receiving end of RS422 serial communication；A, B of RS485/422 conversion chip U4
Transmitting terminal of the interface end as RS422 serial communication；
In foregoing circuit, RS232 conversion chip U5 uses MAX232, and RS485/422 conversion chip U3, U4 are all made of
SP485EEN；
When the signal of the RS232 control terminal of MCU, RS485 control terminal, RS422 control terminal, the enable end EN485 is respectively 1,0,0,0
When (1 represents high level, and 0 represents low level), be switched to RS232 serial communication；Or door U2B output 0,0 is also exported with door U1B,
At this time or door U2A only receives through the data with the received RXD data output end from RS232 conversion chip U5 of door U1A；
The transmission data of the TXD data port of MCU enter the TXD data input pin of RS232 conversion chip U5；
When the signal of the RS232 control terminal of MCU, RS422 control terminal, the enable end EN485 is respectively 0,0,1, it is switched to RS485 string
Port communications；The data transmit-receive of the signal control RS485 serial communication of the RS485 control terminal of MCU, when the RS485 control terminal of MCU
Signal is 1, then sends for the data of RS485 serial communication, and the signal of the RS485 control terminal of MCU is 0, then logical for RS485 serial ports
The data receiver of letter realizes the data transmit-receive of RS485 serial communication by RS485/422 conversion chip U3；RS485/422 conversion
The shutdown of high level that the data receiver function of chip U4 is connect by resistance R2, due to 3 feet of U4 at this time connect low level thus its
Data sending function is also switched off；The data receiver of RS232 serial communication has also been cut off with the shutdown of door U1A；
When the signal of the RS232 control terminal of MCU, RS485 control terminal, RS422 control terminal, the enable end EN485 is respectively 0,0,1,0
When, it is switched to RS422 serial communication；RS485/422 conversion chip U3 is responsible for data receiver at this time, and RS485/422 converts core
Piece U4 is responsible for data transmission.
Multiple serial communication switching device proposed by the present invention facilitates and carries out tri- kinds of signals of RS232, RS485, RS422
Intelligence automatically switches, and single communication mode can also be set as by MCU；Data input-switching circuit, data transmit-receive control electricity
The simple common logical AND gate of routing and logic sum gate chip composition, circuit is simple and practical, and wide usage is good, solves multi-channel serial port
The problem of communicating while carrying out.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (4)
1. a kind of multiple serial communication switching device, which is characterized in that including MCU, data input-switching circuit, data transmit-receive control
Circuit processed, RS232 conversion chip U5, RS485/422 conversion chip U3 and U4；
Each input terminal of data input-switching circuit is separately connected RXD data output end, the RS485/ of RS232 conversion chip U5
The RXD data output end of 422 conversion chip U3；The RXD data port of the output end connection MCU of data input-switching circuit；MCU
By the control to data input-switching circuit, the received switching of RS232/RS485/RS422 serial port communication data is realized；
RS485/422 conversion chip U3 is used for the data transmit-receive of RS485 serial communication, and MCU passes through control terminal and data transmit-receive control
Circuit control RS485/422 conversion chip U3 processed carries out the data transmit-receive of RS485 serial communication；The TXD data port of MCU is distinguished
Connect the TXD data input pin of RS232 conversion chip U5, TXD data input pin, the RS485/ of RS485/422 conversion chip U3
The TXD data input pin of 422 conversion chip U4；
RS485/422 conversion chip U3 doubles as the data receiver of RS422 serial communication, and RS485/422 conversion chip U4 is used for
The data of RS422 serial communication are sent；MCU is realized by control terminal and data transmit-receive control circuit converts core to RS485/422
The control of piece U3, U4.
2. multiple serial communication switching device as described in claim 1, which is characterized in that
Data input-switching circuit includes and door U1A, U1B or door U2A, U2B；
With the RXD data output end of the A input termination RS232 conversion chip U5 of door U1A, the B input with door U1A terminates MCU's
RS232 control terminal, with the Y output termination of door U1A or the A input terminal of door U2A；Or A input terminal and B the input terminal difference of door U2B
Meet the enable end EN485 of MCU and the A input terminal of RS422 control terminal or Y the output termination and door U1B of door U2B, the B with door U1B
The RXD data output end of input termination RS485/422 conversion chip U3 is inputted with the Y output termination of door U1B or the B of door U2A
End；Or the RXD data port of the Y output termination MCU of door U2A.
3. multiple serial communication switching device as claimed in claim 1 or 2, which is characterized in that
Data transmit-receive control circuit includes and door U1C；The RS485 control terminal that MCU is terminated with the A input of door U1C, the B with door U1C
The enable end EN485 of input termination MCU, reception control terminal and hair with the output termination RS485/422 conversion chip U3 of door U1C
Send control terminal；
The reception control terminal of RS485/422 conversion chip U4 connects high level, the hair of RS485/422 conversion chip U4 by resistance R2
Send the RS422 control terminal of control termination MCU；
The reception control terminal of RS485/422 conversion chip U3, U4 are all that low level is effective, and sending control terminal is all that high level has
Effect.
4. multiple serial communication switching device as claimed in claim 3, which is characterized in that
When the signal of the RS232 control terminal of MCU, RS485 control terminal, RS422 control terminal, the enable end EN485 is respectively 1,0,0,0
When, it is switched to RS232 serial communication；
When the signal of the RS232 control terminal of MCU, RS422 control terminal, the enable end EN485 is respectively 0,0,1, it is switched to RS485 string
Port communications；The data transmit-receive of the signal control RS485 serial communication of the RS485 control terminal of MCU；
When the signal of the RS232 control terminal of MCU, RS485 control terminal, RS422 control terminal, the enable end EN485 is respectively 0,0,1,0
When, it is switched to RS422 serial communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811502996.0A CN109376109A (en) | 2018-12-10 | 2018-12-10 | Multiple serial communication switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811502996.0A CN109376109A (en) | 2018-12-10 | 2018-12-10 | Multiple serial communication switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109376109A true CN109376109A (en) | 2019-02-22 |
Family
ID=65372923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811502996.0A Pending CN109376109A (en) | 2018-12-10 | 2018-12-10 | Multiple serial communication switching device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109376109A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117609144A (en) * | 2024-01-23 | 2024-02-27 | 深圳市三旺通信股份有限公司 | RS485, RS422 and RS232 three-in-one interface multiplexing circuit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202177898U (en) * | 2011-07-27 | 2012-03-28 | 上海耀华称重系统有限公司 | RS232/RS485 (Recommended Standard 232/Recommended Standard 232) switching circuit of universal asynchronous receiver transmitter (UART) |
| CN202649998U (en) * | 2012-05-17 | 2013-01-02 | 北京北变智达科技有限公司 | RS232/RS485/RS422 comprehensive test interface circuit |
| CN203027245U (en) * | 2012-11-09 | 2013-06-26 | 深圳市祈飞科技有限公司 | RS232 and RS485 adaptive interface circuit |
| CN204044808U (en) * | 2014-08-11 | 2014-12-24 | 上海艾络格电子技术有限公司 | The device that a kind of RS232 of realization, RS485 and USB turn mutually |
| CN205039834U (en) * | 2015-10-15 | 2016-02-17 | 江苏天泽环保科技有限公司 | Communication device's of many serial portss automatic switch -over circuit |
| CN209044590U (en) * | 2018-12-10 | 2019-06-28 | 无锡路通视信网络股份有限公司 | Multiple serial communication switching device |
-
2018
- 2018-12-10 CN CN201811502996.0A patent/CN109376109A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202177898U (en) * | 2011-07-27 | 2012-03-28 | 上海耀华称重系统有限公司 | RS232/RS485 (Recommended Standard 232/Recommended Standard 232) switching circuit of universal asynchronous receiver transmitter (UART) |
| CN202649998U (en) * | 2012-05-17 | 2013-01-02 | 北京北变智达科技有限公司 | RS232/RS485/RS422 comprehensive test interface circuit |
| CN203027245U (en) * | 2012-11-09 | 2013-06-26 | 深圳市祈飞科技有限公司 | RS232 and RS485 adaptive interface circuit |
| CN204044808U (en) * | 2014-08-11 | 2014-12-24 | 上海艾络格电子技术有限公司 | The device that a kind of RS232 of realization, RS485 and USB turn mutually |
| CN205039834U (en) * | 2015-10-15 | 2016-02-17 | 江苏天泽环保科技有限公司 | Communication device's of many serial portss automatic switch -over circuit |
| CN209044590U (en) * | 2018-12-10 | 2019-06-28 | 无锡路通视信网络股份有限公司 | Multiple serial communication switching device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117609144A (en) * | 2024-01-23 | 2024-02-27 | 深圳市三旺通信股份有限公司 | RS485, RS422 and RS232 three-in-one interface multiplexing circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105786742B (en) | Server serial port switching device and method and server | |
| CN201072550Y (en) | Selection circuit suitable for duplex data transmission interface | |
| CN202084028U (en) | Modularized multi-serial port expanding device | |
| CN206498430U (en) | A kind of bridger | |
| CN205038637U (en) | RS232 and RS485422 interface converter based on microprocessor | |
| CN106383800A (en) | Intelligent serial interface equipment switching device and method | |
| CN216596246U (en) | Self-adaptive circuit compatible with multi-serial port protocol and communication equipment | |
| CN209044590U (en) | Multiple serial communication switching device | |
| CN212009333U (en) | Interface board compatible with multiple interface signals | |
| CN103972909A (en) | TSC (thyristor switched capacitor) system and RS485 communication method thereof based on FPGA (Field Programmable Gate Array) | |
| CN109376109A (en) | Multiple serial communication switching device | |
| CN210137320U (en) | RS485 circuit capable of automatically switching receiving and transmitting states | |
| CN111372257B (en) | Remote coverage unit control method and device and remote coverage unit | |
| CN205788168U (en) | Master-slave mode serial equipment hub | |
| CN105045740A (en) | Conversion method and circuit for communication interfaces | |
| CN101834622B (en) | Singlechip control chip, data transceiving method and data transmission device | |
| CN201163783Y (en) | Multi-serial port card based on CAN bus | |
| CN101483484B (en) | Optical fiber straight-forward station adapter and working method | |
| CN107908584B (en) | Multi-path RS-485 communication network | |
| CN205091733U (en) | Communication interface conversion device | |
| CN201820120U (en) | Self-adapting multibus execution mechanism controller | |
| CN214376432U (en) | Terminal RS485 and RS232 switching circuit are fused to platform district intelligence | |
| CN205249496U (en) | Wireless communication terminal | |
| CN213042273U (en) | Circuit for converting two-wire system serial bus interface into single-wire half-duplex bus interface | |
| CN209170052U (en) | A kind of multi-level communication conversion module that 10kV switch controller is embedded |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |