CN109460376A - The transmission of data serial code and RS485 converter - Google Patents
The transmission of data serial code and RS485 converter Download PDFInfo
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- CN109460376A CN109460376A CN201811516951.9A CN201811516951A CN109460376A CN 109460376 A CN109460376 A CN 109460376A CN 201811516951 A CN201811516951 A CN 201811516951A CN 109460376 A CN109460376 A CN 109460376A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims description 25
- 230000000087 stabilizing effect Effects 0.000 claims description 19
- 238000002955 isolation Methods 0.000 claims description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 5
- 238000009421 internal insulation Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 11
- 239000003245 coal Substances 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005670 electromagnetic radiation Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 241000596154 Belamcanda Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 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
- G06F13/382—Information transfer, e.g. on bus using universal interface adapter
- G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
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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
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- 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
- H04L12/40032—Details regarding a bus interface enhancer
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- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses a kind of transmission of data serial code and RS485 converter, it include: micro controller module, the basic external circuit module of microcontroller, numeric string code interface module, RS485 module, storage module, intrinsic safety electric source module, the basic external circuit module of the microcontroller, numeric string code interface module, RS485 module, storage module are connected with micro controller module respectively, and the intrinsic safety electric source module is connected to its power supply with micro controller module, the basic external circuit module of microcontroller, numeric string code interface module, RS485 module, storage module respectively.Data serial code transmission of the invention reaches 3 grades of requirements above with RS485 converter electromagnetism interference degree, can mutually convert between data serial code signal and RS485 signal.It is strong that the converter advantage is that stable and reliable for performance, strong antijamming capability, Operation and Maintenance be simple, signal receives transfer capability, convenient for installing in underground coal mine, helps the connected network communication between equipment.
Description
Technical field
The present invention relates to a kind of transmission of data serial code and RS485 converter, belong to technical field of communication equipment.
Background technique
Data serial code is that a kind of constant-current type current pulse signal standard has using one way data communication mode
Good anti-interference ability, but do not have network savvy, the internet of things era is greatly developed currently, is no longer satisfied intelligence
The requirement of communication.
RS485 is the standard of the electrical characteristic of the driver and receiver in a definition balance digital multi-drop system, is adopted
It, can be under the conditions of remote and electronic noise using the digital communications network of the standard with half-duplex asynchronous data communication mode
It can effectively transmitted signal under big environment.Point-to-point communication may be implemented in it, and is able to achieve network savvy.It is applied more is collecting
Between middle control hinge and decentralised control unit.
What existing coal mine simulation quantity sensor was sent is data serial code data, and colliery monitoring substation uses RS485
Standard carries out communication networking, in order to enable coal mine sensor to realize connected network communication with colliery monitoring substation, it is necessary to develop a kind of suitable
The transmission of data serial code and RS485 converter for electromagnetic interference environment under coal mine.
Summary of the invention
The purpose of the present invention is to provide a kind of transmission of data serial code and RS485 converter, for monitoring to coal mine
The mutual conversion of substation and various analog sensor communication modes.The data serial yardage sended over by receiving sensor
According to being converted using microcontrol processor, the signaling mode for being transformed into RS485 standard sends outstation to again.Meanwhile
RS485 interface end also needs to be added the circuit of anti-electromagnetic-radiation interference, to guarantee that sensor can not be by the interference of electromagnetic radiation.
The purpose of the present invention is achieved by the following technical programs:
A kind of transmission of data serial code and RS485 converter, comprising: the basic external electrical of micro controller module 1, microcontroller
Road module 2, numeric string code interface module 3, RS485 module 4, storage module 5, intrinsic safety electric source module 6, the microcontroller are basic
External circuit module 2, numeric string code interface module 3, RS485 module 4, storage module 5 are connected with micro controller module 1 respectively,
The intrinsic safety electric source module 6 respectively with micro controller module 1, the basic external circuit module 2 of microcontroller, numeric string code interface mould
Block 3, RS485 module 4, storage module 5 are connected to its power supply.
The purpose of the present invention can also be further realized by following technical measures:
Aforementioned digital serial code transmission with RS485 converter, wherein intrinsic safety electric source module 6 include Voltage stabilizing module 1805, can
Control silicon Q1, diode D1, diode D2, Anti-surging diode D4, zener diode D5, capacitor C1, resistance R3, the Anti-surging
The plus earth of diode D4, cathode connect 18V power supply, and the anode of the diode D1 meets 18V power supply, cathode and diode D2
Anode is connected, and the cathode of diode D2 is connected with 2 feet of Voltage stabilizing module 1805, the 3 feet ground connection of the Voltage stabilizing module 1805, described
1 foot of Voltage stabilizing module 1805 exports 5V power supply, and the capacitor C1, resistance R3 form parallel circuit, and one end of parallel circuit is grounded,
The anode of another termination zener diode D5, the cathode of zener diode D5 meet 1 foot of Voltage stabilizing module 1805, the silicon-controlled Q1
Anode be connected with 1 foot of Voltage stabilizing module 1805, minus earth, trigger electrode connects the anode of zener diode D5.
The transmission of aforementioned digital serial code and RS485 converter, wherein numeric string code interface module 3 includes that LM321 signal is put
Big device, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, capacitor C10, capacitor C11, capacitor C12, diode
A termination data serial code signal of D11, isolation resistance R508, the resistance R11, the other end series resistance R12 of resistance R11
It is followed by the end-IN of LM321 signal amplifier, the plus earth of the diode D11, the cathode of diode D11 is connected to resistance
Between R11, resistance R12, the resistance R13 is parallel to the both ends of diode D11, a termination LM321 signal of the capacitor C11
The end-IN of amplifier, the other end ground connection of capacitor C11, a termination 5V positive pole of the resistance R14, resistance R14's is another
End is grounded through resistance R15, and the end+IN of the LM321 signal amplifier is connected between resistance R14, resistance R15, the LM321 letter
The end the V- ground connection of number amplifier, the V+ of the LM321 signal amplifier terminate 5V positive pole, and the capacitor C10 is connected to 5V electricity
Between source anode and ground, the capacitor C12 is connected between the OUT terminal and ground of LM321 signal amplifier, and the LM321 signal is put
The output signal of big device is through micro controller module 1 incoming after isolation resistance R508.
The transmission of aforementioned digital serial code and RS485 converter, wherein RS485 module 4 includes RS485 transceiver U4, pull-up
Resistance R43, pull down resistor R44, RS485 transceiver U4 are the enhanced RS485 transceiver with isolation, model ADM2483, institute
The 3rd foot for stating RS485 transceiver U4 receives the signal sended over from micro controller module 1, by RS485 transceiver U4's
Internal insulation device and transceiver are sent from the 12nd foot through pull-up resistor R43；Received signal passes through pull down resistor R44, from
The 13rd foot of RS485 transceiver U4 returns to micro-control from the 6th foot of RS485 transceiver U4 by internal transceiver and isolator
Device module 1 processed.
Compared with prior art, the beneficial effects of the present invention are: the transmission of data serial code and RS485 converter of the invention
Electromagnetism interference degree reaches 3 grades of requirements above, can mutually convert between data serial code signal and RS485 signal.The conversion
It is strong that device advantage is that stable and reliable for performance, strong antijamming capability, Operation and Maintenance be simple, signal receives transfer capability, convenient in coal mine
Underground installation, helps the connected network communication between equipment.
Detailed description of the invention
Fig. 1 is system construction drawing of the invention；
Fig. 2 is intrinsic safety electric source module circuit schematic of the invention；
Fig. 3 is numeric string code interface module circuit schematic diagram of the invention；
Fig. 4 is RS485 module circuit schematic of the invention.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples.
As shown in Figure 1, the transmission of data serial code and RS485 converter of the invention, comprising: micro controller module 1, micro-control
The basic external circuit module 2 of device processed, numeric string code interface module 3, RS485 module 4, storage module 5, intrinsic safety electric source module 6, institute
State the basic external circuit module 2 of microcontroller, numeric string code interface module 3, RS485 module 4, storage module 5 respectively with micro-control
Device module 1 processed be connected, the intrinsic safety electric source module 6 respectively with micro controller module 1, the basic external circuit module 2 of microcontroller,
Numeric string code interface module 3, RS485 module 4, storage module 5 are connected to its power supply.The basic external circuit mould of microcontroller
Block 2 provides crystal oscillator, reset function cooperation micro controller module 1 works, and storage module 5 can be used eeprom memory for saving
Data, data serial signal amplifies through numeric string code interface module 3, isolation is delivered to micro controller module 1 and is converted into RS485 letter
Number, RS485 signal is delivered to after RS485 module 4 is isolated to colliery monitoring substation and carries out signal transmission, by mine supervision point
The signal returned stand after the isolation of RS485 module 4, returns to micro controller module 1.
In order to guarantee that sensor can not be needed to be added in intrinsic safety electric source module 6 anti-electromagnetism spoke by the interference of electromagnetic radiation
The circuit that blackberry lily is disturbed, as shown in Fig. 2, intrinsic safety electric source module 6 includes Voltage stabilizing module 1805, silicon-controlled Q1, diode D1, diode
D2, Anti-surging diode D4, zener diode D5, capacitor C1, resistance R3, the plus earth of the Anti-surging diode D4, yin
Pole connects 18V power supply, and the anode of the diode D1 connects 18V power supply, cathode is connected with the anode of diode D2, the yin of diode D2
Pole is connected with 2 feet of Voltage stabilizing module 1805, the 3 feet ground connection of the Voltage stabilizing module 1805, the 1 foot output of the Voltage stabilizing module 1805
5V power supply, the capacitor C1, resistance R3 form parallel circuit, one end ground connection of parallel circuit, another termination zener diode D5
Anode, the cathode of zener diode D5 connects 1 foot of Voltage stabilizing module 1805, the anode and Voltage stabilizing module 1805 of the silicon-controlled Q1
1 foot be connected, minus earth, trigger electrode connects the anode of zener diode D5.
When thering is biggish lightning surge interference source or electric transient pulse train interference source to enter 18V intrinsic safety electric source input terminal
When, Anti-surging diode D4 can fall the energy of these interference source signals with transient absorption.Diode D1, diode D2 are as dual
Current-limiting protection measure prevents late-class circuit from breaking down and generates larger current reverse reflux to intrinsically safe circuit output end, plays this
Pacify protective effect.If Voltage stabilizing module 1805 breaks down after failure, when 18V direct current being caused directly to seal in late-class circuit,
The zener diode D5 of 5V reversely ends, and silicon-controlled Q1 is opened, and 18V intrinsic safety DC input is directly entered short-circuit protection shape
State again serves to safety protection effect.
As shown in figure 3, numeric string code interface module 3 includes LM321 signal amplifier, resistance R11, resistance R12, resistance
R13, resistance R14, resistance R15, capacitor C10, capacitor C11, capacitor C12, diode D11, isolation resistance R508, the resistance
A termination data serial code signal of R11, the other end series resistance R12 of resistance R11 are followed by the-IN of LM321 signal amplifier
End, the plus earth of the diode D11, the cathode of diode D11 are connected between resistance R11, resistance R12, the resistance R13
The both ends of diode D11 are parallel to, the end-IN of a termination LM321 signal amplifier of the capacitor C11, capacitor C11's is another
End ground connection, a termination 5V positive pole of the resistance R14, the other end of resistance R14 are grounded through resistance R15, the LM321 letter
The end+IN of number amplifier is connected between resistance R14, resistance R15, the end the V- ground connection of the LM321 signal amplifier, described
The V+ of LM321 signal amplifier terminates 5V positive pole, and the capacitor C10 is connected between 5V positive pole and ground, the capacitor
C12 is connected between the OUT terminal and ground of LM321 signal amplifier, and the output signal of the LM321 signal amplifier is through isolation resistance
Incoming micro controller module 1 after R508.
In Fig. 3, data serial code signal is entered by P1 interface, by the LM321 signal amplifier amplification of U10 and R508
2nd foot of incoming master controller U501STC11F04E single-chip microcontroller after isolation resistance, by the 8th after being handled by microcontroller
Human hair combing waste is seen off.
As shown in figure 4, RS485 module 4 includes RS485 transceiver U4, pull-up resistor R43, pull down resistor R44, RS485 receipts
Sending out device U4 is the enhanced RS485 transceiver with isolation, and the 3rd foot of model ADM2483, the RS485 transceiver U4 receive
The signal sended over from micro controller module 1, by the internal insulation device and transceiver of RS485 transceiver U4, from the 12nd
Foot is sent through pull-up resistor R43；Received signal passes through pull down resistor R44, passes through from the 13rd foot of RS485 transceiver U4
Internal transceiver and isolator return to micro controller module 1 from the 6th foot of RS485 transceiver U4.
In addition to the implementation, the present invention can also have other embodiments, all to use equivalent substitution or equivalent transformation shape
At technical solution, be all fallen within the protection domain of application claims.
Claims (4)
1. a kind of data serial code transmission and RS485 converter characterized by comprising micro controller module, microcontroller base
This external circuit module, numeric string code interface module, RS485 module, storage module, intrinsic safety electric source module, the microcontroller
Basic external circuit module, numeric string code interface module, RS485 module, storage module are connected with micro controller module respectively, institute
State intrinsic safety electric source module respectively with micro controller module, the basic external circuit module of microcontroller, numeric string code interface module,
RS485 module, storage module are connected to its power supply.
2. data serial code transmission as described in claim 1 and RS485 converter, which is characterized in that the intrinsic safety electric source mould
Block includes Voltage stabilizing module 1805, silicon-controlled Q1, diode D1, diode D2, Anti-surging diode D4, zener diode D5, electricity
Hold C1, resistance R3, the plus earth of the Anti-surging diode D4, cathode connect 18V power supply, and the anode of the diode D1 connects
18V power supply, cathode are connected with the anode of diode D2, and the cathode of diode D2 is connected with 2 feet of Voltage stabilizing module 1805, described steady
3 feet of die block 1805 are grounded, and 1 foot of the Voltage stabilizing module 1805 exports 5V power supply, and the capacitor C1, resistance R3 composition are in parallel
Circuit, one end ground connection of parallel circuit, the anode of another termination zener diode D5, the cathode of zener diode D5 connect pressure stabilizing mould
1 foot of block 1805, the anode of the silicon-controlled Q1 are connected with 1 foot of Voltage stabilizing module 1805, and minus earth, trigger electrode connects pressure stabilizing two
The anode of pole pipe D5.
3. data serial code transmission as described in claim 1 and RS485 converter, which is characterized in that the numeric string code connects
Mouth mold block includes LM321 signal amplifier, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, capacitor C10, electricity
Hold a termination data serial code signal of C11, capacitor C12, diode D11, isolation resistance R508, the resistance R11, resistance
The other end series resistance R12 of R11 is followed by the end-IN of LM321 signal amplifier, the plus earth of the diode D11, two poles
The cathode of pipe D11 is connected between resistance R11, resistance R12, and the resistance R13 is parallel to the both ends of diode D11, the capacitor
The end-IN of a termination LM321 signal amplifier of C11, the other end ground connection of capacitor C11, a termination 5V electricity of the resistance R14
Source anode, the other end of resistance R14 are grounded through resistance R15, and the end+IN of the LM321 signal amplifier is connected to resistance R14, electricity
It hinders between R15, the end V- of the LM321 signal amplifier is grounded, and the V+ termination 5V power supply of the LM321 signal amplifier is just
Pole, the capacitor C10 are connected between 5V positive pole and ground, the capacitor C12 be connected to LM321 signal amplifier OUT terminal and
Between ground, the output signal of the LM321 signal amplifier is through micro controller module incoming after isolation resistance R508.
4. data serial code transmission as described in claim 1 and RS485 converter, which is characterized in that the RS485 module packet
Including RS485 transceiver U4, pull-up resistor R43, pull down resistor R44, RS485 transceiver U4 is that the enhanced RS485 with isolation is received
Device is sent out, the 3rd foot of model ADM2483, the RS485 transceiver U4 receive the letter sended over from micro controller module
Number, by the internal insulation device and transceiver of RS485 transceiver U4, sent from the 12nd foot through pull-up resistor R43；It is received
Signal passes through pull down resistor R44, from the 13rd foot of RS485 transceiver U4 by internal transceiver and isolator, receives and dispatches from RS485
The 6th foot of device U4 returns to micro controller module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811516951.9A CN109460376B (en) | 2018-12-12 | 2018-12-12 | Digital serial code transmission and RS485 converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811516951.9A CN109460376B (en) | 2018-12-12 | 2018-12-12 | Digital serial code transmission and RS485 converter |
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| CN109460376A true CN109460376A (en) | 2019-03-12 |
| CN109460376B CN109460376B (en) | 2024-06-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568034A (en) * | 2019-07-25 | 2019-12-13 | 武汉市中易天地物联科技有限公司 | Anti-interference digital pH sensor |
| CN112910257A (en) * | 2021-03-24 | 2021-06-04 | 镇江中煤电子有限公司 | Intrinsic safety circuit of 8-electric-port kilomega double-optical-port switch power supply for mine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355053A (en) * | 2011-08-10 | 2012-02-15 | 西安金源电气股份有限公司 | Transformer air-cooled control ied |
| CN202268916U (en) * | 2011-11-03 | 2012-06-06 | 河南驰诚电气有限公司 | RS485 communication isolation module |
| US20160172994A1 (en) * | 2014-12-12 | 2016-06-16 | Finetek Co., Ltd. | Multifunctional signal isolation converter |
| CN106991063A (en) * | 2014-09-17 | 2017-07-28 | 葛云龙 | USB turns the active isolating converters of RS 485 |
| CN108664439A (en) * | 2018-05-15 | 2018-10-16 | 北京机械设备研究所 | A kind of analogue quantity output circuit device of number isolation |
| CN209070522U (en) * | 2018-12-12 | 2019-07-05 | 镇江中煤电子有限公司 | The transmission of data serial code and RS485 converter |
-
2018
- 2018-12-12 CN CN201811516951.9A patent/CN109460376B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355053A (en) * | 2011-08-10 | 2012-02-15 | 西安金源电气股份有限公司 | Transformer air-cooled control ied |
| CN202268916U (en) * | 2011-11-03 | 2012-06-06 | 河南驰诚电气有限公司 | RS485 communication isolation module |
| CN106991063A (en) * | 2014-09-17 | 2017-07-28 | 葛云龙 | USB turns the active isolating converters of RS 485 |
| US20160172994A1 (en) * | 2014-12-12 | 2016-06-16 | Finetek Co., Ltd. | Multifunctional signal isolation converter |
| CN108664439A (en) * | 2018-05-15 | 2018-10-16 | 北京机械设备研究所 | A kind of analogue quantity output circuit device of number isolation |
| CN209070522U (en) * | 2018-12-12 | 2019-07-05 | 镇江中煤电子有限公司 | The transmission of data serial code and RS485 converter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568034A (en) * | 2019-07-25 | 2019-12-13 | 武汉市中易天地物联科技有限公司 | Anti-interference digital pH sensor |
| CN112910257A (en) * | 2021-03-24 | 2021-06-04 | 镇江中煤电子有限公司 | Intrinsic safety circuit of 8-electric-port kilomega double-optical-port switch power supply for mine |
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| Publication number | Publication date |
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| CN109460376B (en) | 2024-06-04 |
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