CN110266573A - More piece point control circuit based on 485 communications - Google Patents
More piece point control circuit based on 485 communications Download PDFInfo
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- CN110266573A CN110266573A CN201910641446.5A CN201910641446A CN110266573A CN 110266573 A CN110266573 A CN 110266573A CN 201910641446 A CN201910641446 A CN 201910641446A CN 110266573 A CN110266573 A CN 110266573A
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- 238000004891 communication Methods 0.000 title claims abstract description 34
- 239000003990 capacitor Substances 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 description 8
- 230000005611 electricity Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 208000025274 Lightning injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
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- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40013—Details regarding a bus controller
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0659—Management of faults, events, alarms or notifications using network fault recovery by isolating or reconfiguring faulty entities
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Small-Scale Networks (AREA)
Abstract
The invention discloses a kind of more piece point control circuits based on 485 communications, including a main RS485 interface module and several from RS485 interface module, the main RS485 interface module is connect with first from RS485 interface module by Shielded Twisted Pair, described first from RS485 interface module by Shielded Twisted Pair with second from RS485 interface module, and so on, described (n-1)th connect with n-th from RS485 interface module from RS485 interface module Shielded Twisted Pair.When the power module from RS485 interface module damages, end of incoming cables is directly connected to by this from RS485 interface module by the switching of relay contact with there is end, this is set to be detached from communication bus from the RS485 interface module, at this point, the RS485 interface module received signal of power module damage is handled without the RS485 interface circuit in it.
Description
Technical field
The present invention relates to serial communication circuit technical fields more particularly to a kind of multinode based on 485 communications to control electricity
Road.
Background technique
RS-485 universal serial bus uses balance transmission and differential received, therefore has the ability for inhibiting common mode interference, therefore
Require communication distance be tens meters to upper km when, RS-485 is widely used.It is generally adopted by RS485 communication network
Master-slave communication mode, the i.e. multiple slaves of host tape, topological structure are as shown in Figure 1.When using RS485 interface, for spy
Fixed transmission line is transmitted from RS485 interface to the load permitted maximum cable length of its data signal transmission and signal
Baud rate is inversely proportional, this length data is mainly influenced by factors such as distorted signals and noises.Theoretically, traffic rate exists
100Kbps and it is following when, the longest transmission range of RS485 is up to 1200 meters, but the distance transmitted in practical applications is also because of core
The transmission characteristic of piece and cable and difference.In addition, in existing topological structure when some node breaks down, to communication
It is affected caused by bus.
Summary of the invention
The technical problem to be solved by the present invention is to how to provide it is a kind of can not only extend total transmission range, but also can be to prevent
When only some node breaks down, to the more piece point control circuit for 485 communications that communication bus impacts.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of multinode control based on 485 communications
Circuit processed, it is characterised in that: including a main RS485 interface module and several from RS485 interface module, the main RS485
Interface module is connect with first from RS485 interface module by Shielded Twisted Pair, and described first passes through screen from RS485 interface module
Cover twisted pair and second from RS485 interface module, and so on, described (n-1)th from RS485 interface module Shielded Twisted Pair and the
N is connected from RS485 interface module, and n is the natural number greater than 2, described to pass through in module from RS485 interface module when normal
It RS485 interface circuit and adjacent described is communicated from RS485 interface module；When the power supply mould from RS485 interface module
When block damages, end of incoming cables should be directly connected to there is end from RS485 interface module by the switching of relay contact, make this from
The RS485 interface module is detached from communication bus, at this point, the RS485 interface module received signal of power module damage is not
By the RS485 interface circuit processing in it.
It include two power supplys a further technical solution lies in: the main RS485 interface module and from RS485 interface module
Module, two relays, two 485 chips and opto-coupler chips, the power module are respectively the relay, 485 chips
And opto-coupler chip provides working power；Two terminals of signal input end of incoming cables P1 connect input differential signal A, B respectively, institute
Two connecting terminals for stating P1 are connect with the common end of double-point double-throw switch in relay K1 respectively, double-pole in the relay K1
Two normally closed interlock terminals of double-point double-throw switch are distinguished in the two normally closed interlock terminals and relay K2 of commutator
Connection；Two normally open contact terminals of double-point double-throw switch are respectively divided into three tunnels in the relay K1, one of them is normally opened
The first via of contact terminals is connect with 6 feet of MAX485SEA cake core U2, and the second tunnel is grounded through zener diode D1, third
Road connects+5V power supply through resistance R3, and the first via of another normally open contact terminals is connect with 7 feet of MAX485SEA cake core U1,
Second tunnel is grounded through zener diode D2, and third road is grounded through resistance R5；The U2 only works in reception pattern；The 8 of the U2
Foot is divided into two-way, and the first via is connect with+5V power supply, and the second tunnel is grounded through capacitor C1；2 feet, 3 feet and the 5 feet ground connection of the U2；Institute
4 feet for stating U2 are hanging；1 foot of the U2 is divided into three tunnels, and the first via is connect with the cathode of light emitting diode in optocoupler U3, the second tunnel
+ 5V power supply is connect through resistance R2, third road is connect with 4 feet of MAX485SEA cake core U4；Two of signal outlet terminal P5 connect
Line end is differential signal outputs, two differential signal outputs of the P5 respectively with double-point double-throw switch in relay K2
Common end connects, and two normally open contact terminals of double-point double-throw switch are respectively divided into three tunnels in the relay K2, wherein one
The first via of a normally open contact terminals is connect with 6 feet of MAX485SEA cake core U4, and the second tunnel connects through zener diode D3
Ground, third road connect+5V power supply through resistance R6, the first via of another normally open contact terminals and the 7 of MAX485SEA cake core U4
Foot connection, the second tunnel are grounded through zener diode D4, and third road is grounded through resistance R7；The U4 only works in sending mode；Institute
8 feet for stating U4 are divided into two-way, and the first via is connect with+5V power supply, and the second tunnel is grounded through capacitor C3；2 feet, 3 feet of the U4 meet+5V
Power supply；1 foot of the U4 is hanging, the 5 feet ground connection of the U4；
The anode of light emitting diode connects+5V power supply through resistance R4 in the optocoupler U3, the hair of phototriode in the optocoupler U3
Emitter grounding, the collector of phototriode is divided into two-way in the optocoupler U3, and the first via is the letter of the RS485 interface module
Number output end, provides Transistor-Transistor Logic level signal for microprocessor, the second tunnel connects+5V power supply through resistance R1.
A further technical solution lies in: the first power module includes AC/DC conversion chip P2, the input termination of the P2
Alternating current 220V power supply, the positive output end of the AC/DC conversion chip P2 are divided into three tunnels after inductance L1, and the first via is described first
+ 5V the power output end of power module, the second tunnel are grounded through capacitor C4, and third road is grounded through capacitor C6.
A further technical solution lies in: second power supply module includes AC/DC conversion chip P3, the input termination of the P3
Alternating current 220V power supply, the positive output end of the AC/DC conversion chip P3 are divided into three tunnels after inductance L2, and the first via is described second
+ 5V the power output end of power module, the second tunnel are grounded through capacitor C5, and third road is grounded through capacitor C7.
A further technical solution lies in: the signal output end being connect from RS485 interface module with the optocoupler
It is connect with the Transistor-Transistor Logic level serial ports input terminal of the single-chip microcontroller U1.
The beneficial effects of adopting the technical scheme are that in herein described control circuit, when node occurs
When lightning stroke or other reasons cause power module P3 failure without output, relay K1, K2 coil losing electricity, normally closed interlock closure,
Normally open contact is opened, and the RS485 differential signal that terminals P1 is inputted directly is exported through terminals P5, and the node is total from communication
It is bypassed on line, it is ensured that communication bus is reliably connected.The control circuit receives RS485 differential signal by U2() and U4
After (transmission) conversion, the effective propagation path between every two communication node is theoretically obtainable the longest transmission distance of RS485
From, and communication node number is unrestricted, in this way, total communication distance can be unrestricted.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is RS485 universal serial bus topology diagram in the prior art；
Fig. 2 is relay communication topology diagram of the embodiment of the present invention；
Fig. 3 is the circuit diagram of RS485 interface module (communication node) in the embodiment of the present invention.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, but the present invention can be with
Implemented using other than the one described here other way, those skilled in the art can be without prejudice to intension of the present invention
In the case of do similar popularization, therefore the present invention is not limited by the specific embodiments disclosed below.
As shown in Fig. 2, the embodiment of the invention discloses a kind of more piece point control circuit based on 485 communications, including one
Main RS485 interface module and several from RS485 interface module, the main RS485 interface module passes through Shielded Twisted Pair and the
One connects from RS485 interface module, described first from RS485 interface module by Shielded Twisted Pair with second from RS485 interface
Module, and so on, described (n-1)th connect with n-th from RS485 interface module from RS485 interface module Shielded Twisted Pair, and n is
Natural number greater than 2, when normal, it is described from RS485 interface module by RS485 interface circuit in module and it is adjacent described in
It is communicated from RS485 interface module；It, should be from RS485 interface module when the power module from RS485 interface module damages
End of incoming cables is directly connected to there is end by the switching of relay contact, this is made to be detached from communication always from the RS485 interface module
Line, at this point, power module damage the RS485 interface module received signal without the RS485 interface circuit in it at
Reason.
Further, as shown in figure 3, the main RS485 interface module and from RS485 interface module include two power supply moulds
Block, two relays, two 485 chips and opto-coupler chips, the power module be respectively the relay, 485 chips with
And opto-coupler chip provides working power；Two terminals of signal input end of incoming cables P1 connect input differential signal A, B respectively, described
Two connecting terminals of P1 are connect with the common end of double-point double-throw switch in relay K1 respectively, and double-pole is double in the relay K1
Two normally closed interlock terminals of throw switch and two normally closed interlock terminals of double-point double-throw switch in relay K2 connect respectively
It connects；Two normally open contact terminals of double-point double-throw switch are respectively divided into three tunnels in the relay K1, one of them normally opened touching
The first via of head terminals is connect with 6 feet of MAX485SEA cake core U2, and the second tunnel is grounded through zener diode D1, third road
+ 5V power supply is connect through resistance R3, the first via of another normally open contact terminals is connect with 7 feet of MAX485SEA cake core U1, the
Two tunnels are grounded through zener diode D2, and third road is grounded through resistance R5；The U2 only works in reception pattern；8 feet of the U2
It is divided into two-way, the first via is connect with+5V power supply, and the second tunnel is grounded through capacitor C1；2 feet, 3 feet and the 5 feet ground connection of the U2；It is described
4 feet of U2 are hanging；1 foot of the U2 is divided into three tunnels, and the first via is connect with the cathode of light emitting diode in optocoupler U3, the second road warp
Resistance R2 connects+5V power supply, and third road is connect with 4 feet of MAX485SEA cake core U4；Two wiring of signal outlet terminal P5
End is differential signal outputs, two differential signal outputs of P5 public affairs with double-point double-throw switch in relay K2 respectively
End connects altogether, and two normally open contact terminals of double-point double-throw switch are respectively divided into three tunnels in the relay K2, one of them
The first via of normally open contact terminals is connect with 6 feet of MAX485SEA cake core U4, and the second tunnel is grounded through zener diode D3,
Third road connects+5V power supply through resistance R6, the first via of another normally open contact terminals and 7 feet of MAX485SEA cake core U4
Connection, the second tunnel are grounded through zener diode D4, and third road is grounded through resistance R7；The U4 only works in sending mode；It is described
8 feet of U4 are divided into two-way, and the first via is connect with+5V power supply, and the second tunnel is grounded through capacitor C3；2 feet, 3 feet of the U4 connect+5V electricity
Source；1 foot of the U4 is hanging, the 5 feet ground connection of the U4；
The anode of light emitting diode connects+5V power supply through resistance R4 in the optocoupler U3, the hair of phototriode in the optocoupler U3
Emitter grounding, the collector of phototriode is divided into two-way in the optocoupler U3, and the first via is the letter of the RS485 interface module
Number output end, provides Transistor-Transistor Logic level signal for microprocessor, the second tunnel connects+5V power supply through resistance R1.
Further, as shown in figure 3, the first power module includes AC/DC conversion chip P2, the input of the P2, which terminates, is handed over
220V power supply is flowed, the positive output end of the AC/DC conversion chip P2 is divided into three tunnels after inductance L1, and the first via is first electricity
+ 5V the power output end of source module, the second tunnel are grounded through capacitor C4, and third road is grounded through capacitor C6.
Further, as shown in figure 3, second power supply module includes AC/DC conversion chip P3, the input of the P3, which terminates, is handed over
220V power supply is flowed, the positive output end of the AC/DC conversion chip P3 is divided into three tunnels after inductance L2, and the first via is second electricity
+ 5V the power output end of source module, the second tunnel are grounded through capacitor C5, and third road is grounded through capacitor C7.
In Fig. 3, P2, P3 are power module, and the alternating current 220V voltage of input is converted to stable direct current 5V voltage；U1 is
Single-chip microcontroller with serial ports；U3 is optocoupler, plays signal isolation；U2, U4 are MAX485 chip, and U2, which only works, is receiving mould
Formula, U4 only work in sending mode；K1, K2 are relay, play signal switching；P1 is RS485 signal input terminal, P5
For RS485 signal outlet terminal.
When normally powering on, the coil of relay K1, K2 obtain electric, normally open contact closure, P1 terminals and U2 connection, P5
Terminals and U4 connect (double-point double-throw switch connects the contact of upside in Fig. 3 with U2 and U4 respectively in K1, K2).P1 input
RS485 differential signal is converted to Transistor-Transistor Logic level signal through U2, which receives by the serial ports that optocoupler is input to single-chip microcontroller U1
End is used for data processing；The Transistor-Transistor Logic level signal of U2 conversion is input to the Transistor-Transistor Logic level receiving end of U4 simultaneously, and U4 believes Transistor-Transistor Logic level
Number be converted to RS485 differential signal exports through P5 terminals.
When being struck by lightning occurs in node or other reasons cause power module P3 failure without output, relay K1, K2 deactivation coil
Electricity, normally closed interlock closure, normally open contact are opened, and the RS485 differential signal that P1 terminals are inputted is directly defeated through P5 terminals
Out, which is bypassed from communication bus, while guarantees that communication bus is reliably connected.
The design by RS485 differential signal by U2(receive) and U4(send) convert after, between every two communication node
Effective propagation path be theoretically obtainable the longest transmission range of RS485, and communication node number is unrestricted, in this way, always
Communication distance can be unrestricted.
Claims (5)
1. a kind of more piece point control circuit based on 485 communications, it is characterised in that: if including a main RS485 interface module and
Dry is connected with first from RS485 interface module from RS485 interface module, the main RS485 interface module by Shielded Twisted Pair
Connect, described first from RS485 interface module by Shielded Twisted Pair with second from RS485 interface module, and so on, described the
N-1 is connect with n-th from RS485 interface module from RS485 interface module Shielded Twisted Pair, and n is the natural number greater than 2, when normal,
It is described from RS485 interface module by RS485 interface circuit in module and it is adjacent described in communicate from RS485 interface module；
When the power module from RS485 interface module damages, it is somebody's turn to do the switching that passed through relay contact from RS485 interface module
End of incoming cables is directly connected to there is end, this is made to be detached from communication bus from the RS485 interface module, at this point, power module damages
The RS485 interface module received signal without in it RS485 interface circuit handle.
2. the more piece point control circuit as described in claim 1 based on 485 communications, it is characterised in that: the main RS485 interface
Module and from RS485 interface module include two power modules, two relays, two 485 chips and opto-coupler chips, it is described
Power module is respectively that the relay, 485 chips and opto-coupler chip provide working power；Signal inputs the two of end of incoming cables P1
A terminals connect input differential signal A, B respectively, and two connecting terminals of the P1 are opened with double-pole double throw in relay K1 respectively
The common end of pass connects, double-pole in the two normally closed interlock terminals and relay K2 of double-point double-throw switch in the relay K1
Two normally closed interlock terminals of commutator are separately connected；Two normally open contacts of double-point double-throw switch in the relay K1
Terminals are respectively divided into three tunnels, and the first via of one of normally open contact terminals and 6 feet of MAX485SEA cake core U2 connect
It connecing, the second tunnel is grounded through zener diode D1, and third road connects+5V power supply through resistance R3, and the of another normally open contact terminals
It is connect all the way with 7 feet of MAX485SEA cake core U1, the second tunnel is grounded through zener diode D2, and third road is grounded through resistance R5；
The U2 only works in reception pattern；8 feet of the U2 are divided into two-way, and the first via is connect with+5V power supply, and the second tunnel is through capacitor C1
Ground connection；2 feet, 3 feet and the 5 feet ground connection of the U2；4 feet of the U2 are hanging；1 foot of the U2 is divided into three tunnels, the first via
It is connect with the cathode of light emitting diode in optocoupler U3, the second tunnel connects+5V power supply, third road and MAX485SEA type core through resistance R2
4 feet of piece U4 connect;Two terminals of signal outlet terminal P5 are differential signal outputs, and two difference of the P5 are believed
Number output end is connect with the common end of double-point double-throw switch in relay K2 respectively, double-point double-throw switch in the relay K2
Two normally open contact terminals are respectively divided into three tunnels, the first via and MAX485SEA type core of one of normally open contact terminals
6 feet of piece U4 connect, and the second tunnel is grounded through zener diode D3, and third road connects+5V power supply through resistance R6, another normally open contact
The first via of terminals is connect with 7 feet of MAX485SEA cake core U4, and the second tunnel is grounded through zener diode D4, third road warp
Resistance R7 ground connection；The U4 only works in sending mode；8 feet of the U4 are divided into two-way, and the first via is connect with+5V power supply, the
Two tunnels are grounded through capacitor C3；2 feet, 3 feet of the U4 connect+5V power supply；1 foot of the U4 is hanging, the 5 feet ground connection of the U4；
The anode of light emitting diode connects+5V power supply through resistance R4 in the optocoupler U3, the hair of phototriode in the optocoupler U3
Emitter grounding, the collector of phototriode is divided into two-way in the optocoupler U3, and the first via is the letter of the RS485 interface module
Number output end, provides Transistor-Transistor Logic level signal for microprocessor, the second tunnel connects+5V power supply through resistance R1.
3. the more piece point control circuit as claimed in claim 2 based on 485 communications, it is characterised in that: the first power module packet
AC/DC conversion chip P2 is included, the input of the P2 terminates alternating current 220V power supply, the positive output end of the AC/DC conversion chip P2
It is divided into three tunnels after inductance L1, the first via is the+5V power output end of first power module, and the second tunnel connects through capacitor C4
Ground, third road are grounded through capacitor C6.
4. the more piece point control circuit as claimed in claim 2 based on 485 communications, it is characterised in that: second power supply module packet
AC/DC conversion chip P3 is included, the input of the P3 terminates alternating current 220V power supply, the positive output end of the AC/DC conversion chip P3
It is divided into three tunnels after inductance L2, the first via is the+5V power output end of the second power supply module, and the second tunnel connects through capacitor C5
Ground, third road are grounded through capacitor C7.
5. the more piece point control circuit as claimed in claim 2 based on 485 communications, it is characterised in that: described from RS485 interface
The signal output end connecting in module with the optocoupler is connect with the Transistor-Transistor Logic level serial ports input terminal of the single-chip microcontroller U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910641446.5A CN110266573A (en) | 2019-07-16 | 2019-07-16 | More piece point control circuit based on 485 communications |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910641446.5A CN110266573A (en) | 2019-07-16 | 2019-07-16 | More piece point control circuit based on 485 communications |
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| Publication Number | Publication Date |
|---|---|
| CN110266573A true CN110266573A (en) | 2019-09-20 |
Family
ID=67926500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910641446.5A Pending CN110266573A (en) | 2019-07-16 | 2019-07-16 | More piece point control circuit based on 485 communications |
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| CN (1) | CN110266573A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112260916A (en) * | 2020-09-18 | 2021-01-22 | 深圳市裕展精密科技有限公司 | Communication circuit, communication network, and communication abnormality processing method |
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2019
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| CN2612082Y (en) * | 2003-04-04 | 2004-04-14 | 京东方科技集团股份有限公司 | Rechargeable battery pack |
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