CN104394054A - Arborescence remote communication bus system - Google Patents
Arborescence remote communication bus system Download PDFInfo
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- CN104394054A CN104394054A CN201410783838.2A CN201410783838A CN104394054A CN 104394054 A CN104394054 A CN 104394054A CN 201410783838 A CN201410783838 A CN 201410783838A CN 104394054 A CN104394054 A CN 104394054A
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Abstract
The invention discloses an arborescence remote communication bus system which comprises an above-well communication system and an under-well communication system, wherein an above-well single chip microcomputer is connected with a communication call receiving driving circuit through an above-well communication chip; the under-well communication system comprises a signal receiving circuit and a signal answer circuit; an under-well communication chip is connected with the signal answer circuit; a phase detection control circuit is connected between the signal receiving circuit and the under-well communication chip and is connected with the under-well communication chip through a communication clock; the communication call receiving driving circuit is connected with the signal receiving circuit and the signal answer circuit and can realize information transmission; the under-well single chip microcomputer is also connected with and controls an output circuit and a display circuit. By adoption of the structure, the arborescence remote communication bus system can realize long-distance communication transmission and random arborescence connection; network topology can be expanded without an active node; furthermore, each transmission unit does not need to be coordinated with cable impedance and is not connected by being aligned with the polarity; common-mode interference resistant and relay-free long-distance driving can be realized.
Description
Technical field
The present invention relates to a kind of underground mine use network communication bus system, specifically a kind of tree-shaped remote communication bus system.
Background technology
Network communication bus technology is widely used, to be that communication distance is short be no more than 10M to its major defect usually, although there is rate adaptation long distance bus, but be all that point-to-point communication can not any tree-shaped connection, network topology must rely on active node to expand, and each transmission unit cable resistance must mate, otherwise serious signal reflex can occur cause error code, this is too harsh to underground coal mine application conditions; In prior art, not non-relay long distance drives bus, therefore, constrains the development of Mine Communication.
Summary of the invention
The technical problem to be solved in the present invention is to provide one can any tree-shaped link and do not need impedance matching, do not need to aim at polarity and connect, and can resist the tree-shaped remote communication bus system that the non-relay long distance of common mode disturbances drives.
In order to solve the problems of the technologies described above, tree-shaped remote communication bus system of the present invention, comprise the aboveground communication system being positioned at ground and the underground communication system being positioned at underground, aboveground communication system comprises the aboveground single-chip microcomputer be connected with host computer by signal conversion circuit, aboveground single-chip microcomputer connects a communication call by aboveground communication chip and receives drive circuit, TTL call signal is converted to two-way NRZ by signal conversion circuit by host computer, underground communication system comprises signal receiving circuit and answer back circuit, signal receiving circuit is connected with a signal polarity testing circuit and a polarity control circuit, information transmission is carried out between signal polarity testing circuit and polarity control circuit, signal receiving circuit is also connected with a down-hole single-chip microcomputer by underground communica tion chip, described down-hole single-chip microcomputer is connected with a data acquisition translation circuit and can by data message under data acquisition translation circuit production wells, described underground communica tion chip is connected with answer back circuit and can to answer back circuit transmission information, phase-detection control circuit is connected between signal receiving circuit with underground communica tion chip, phase-detection control circuit is by communication clock connecting downhole communication chip, described communication call receives drive circuit and is connected with signal receiving circuit and answer back circuit and can carries out information transmission, down-hole monolithic is connection control output circuit and display circuit also.
Described signal conversion circuit, aboveground single-chip microcomputer and aboveground communication chip are by DC power supply.
Described aboveground single-chip microcomputer is connected with state indication unit, and communication call receives drive circuit and is connected with aboveground intrinsic safety electric source.
Described answer back circuit connecting downhole intrinsic safety electric source.
Described communication call receives drive circuit and comprises two port SI of communication chip Serial data receiving end on the port C of communication chip serial data transmitting terminal and connecting well on the comparator IC9A of reverse voltage and comparator IC9B and connecting well each other, the communication line of described port C connects photoelectrical coupler 1G3, the communication line of described port SI connects photoelectrical coupler 1G2, 1 pin of described comparator IC9A connects two pins of transistor 1BG4 and transistor 1BG5 simultaneously, 7 pin of described comparator IC9B connect two pins of transistor 1BG6 and transistor 1BG7 simultaneously, described transistor 1BG5 is connected by a branch road with two No. two pins of transistor 1BG7, transistor 1BG4 is connected by No. two branch roads with two No. two pins of transistor 1BG6, 2 pin of described comparator IC9A, be connected on a branch road by resistance 1R24 between 5 pin of comparator IC9B, 2 pin of comparator IC9A, also be connected on No. two branch roads by resistance 1R23 between 5 pin of comparator IC9B, 3 pin of described comparator IC9A, comparator IC9B 6 between be connected on a branch road by resistance 1R26, 3 pin of described comparator IC9A, comparator IC9B 6 between be connected on No. two branch roads by resistance 1R25, light-receiving end one end of described photoelectrical coupler 1G3 is connected to 3 pin of comparator IC9A, comparator IC9B 6 between, one end is connected on a branch road in addition, described transistor 1BG6 is connected 1 pin of communication interface CR1 jointly with No. three pins of transistor 1BG7, one end of described photoelectrical coupler 1G2 is connected between No. three pins of transistor 1BG4 and transistor 1BG5 by resistance 1R21, other one end of photoelectrical coupler 1G2 connects 2 pin of CR1 by No. three branch roads, described No. three branch roads are parallel with resistance 1R22, 1D1 and 1D5 of 1D2 and series connection mutually, described No. three branch roads also connect transistor 1BG4, No. three pins of transistor 1BG5, transistor 1BG6, No. three pins of transistor 1BG7 connect No. three branch roads by 1DLY2.
After adopting above-mentioned structure, by signal conversion circuit, TTL call signal is converted to the two-way NRZ of +/-30V, recall signal is converted to the high/low feature of impedance simultaneously, realizes network remote signal transmission; Signal polarity control circuit in substation can by the bus marco that connects at random to correct status, thus realize using common 2 heart yearn cables to realize the single-chip microcomputer distributed network communication of long distance, nonpolarity connection, thus achieve long distance and carry out communications, can any tree-shaped connection, network topology does not need to rely on active node expansion, and each transmission unit does not need cable resistance to mate, do not need to aim at polarity and connect, the non-relay long distance of common mode disturbances can be resisted to drive.
Accompanying drawing explanation
Fig. 1 is the tree-shaped remote communication bus system principle diagram of the present invention;
Fig. 2 is that in the present invention, communication call receives driving circuit principle figure;
Fig. 3 is that in the present invention, Signal reception answers circuit theory diagrams.
Embodiment
Below in conjunction with the drawings and specific embodiments, tree-shaped remote communication bus system of the present invention is described in further detail.
As shown in the figure, tree-shaped remote communication bus system of the present invention, comprise the aboveground communication system being positioned at ground and the underground communication system being positioned at underground, aboveground communication system comprises the aboveground single-chip microcomputer be connected with host computer by signal conversion circuit, aboveground single-chip microcomputer is transmitted mutually between can being connected with host computer by signal conversion circuit, aboveground single-chip microcomputer connects a communication call by aboveground communication chip and receives drive circuit, described underground communication system comprises signal receiving circuit and answer back circuit, signal receiving circuit is connected with a signal polarity testing circuit and a polarity control circuit, information transmission is carried out between signal polarity testing circuit and polarity control circuit, signal receiving circuit is also connected with a down-hole single-chip microcomputer by underground communica tion chip, signal receiving circuit can by carrying out information transmission mutually between underground communica tion chip and down-hole single-chip microcomputer, down-hole single-chip microcomputer is connected with a data acquisition translation circuit and can by data message under data acquisition translation circuit production wells, underground communica tion chip is connected with answer back circuit and can to answer back circuit transmission information, phase-detection control circuit is connected between signal receiving circuit with underground communica tion chip, phase-detection control circuit is by communication clock connecting downhole communication chip, communication call receives drive circuit and is connected with signal receiving circuit and answer back circuit and can carries out information transmission, down-hole monolithic is connection control output circuit and display circuit also, wherein, signal conversion circuit, aboveground single-chip microcomputer and aboveground communication chip are by DC power supply, aboveground single-chip microcomputer is connected with state indication unit, and communication call receives drive circuit and is connected with aboveground intrinsic safety electric source, answer back circuit connecting downhole intrinsic safety electric source.
It should be noted that, in the present invention, said communication call receives drive circuit and comprises two port SI of communication chip Serial data receiving end on the port C of communication chip serial data transmitting terminal and connecting well on the comparator IC9A of reverse voltage and comparator IC9B and connecting well each other, the communication line of described port C connects photoelectrical coupler 1G3, the communication line of described port SI connects photoelectrical coupler 1G2, 1 pin of described comparator IC9A connects two pins of transistor 1BG4 and transistor 1BG5 simultaneously, 7 pin of comparator IC9B connect two pins of transistor 1BG6 and transistor 1BG7 simultaneously, described transistor 1BG5 is connected by a branch road with two No. two pins of transistor 1BG7, transistor 1BG4 is connected by No. two branch roads with two No. two pins of transistor 1BG6, 2 pin of described comparator IC9A, be connected on a branch road by resistance 1R24 between 5 pin of comparator IC9B, 2 pin of comparator IC9A, also be connected on No. two branch roads by resistance 1R23 between 5 pin of comparator IC9B, 3 pin of described comparator IC9A, comparator IC9B 6 between be connected on a branch road by resistance 1R26, 3 pin of described comparator IC9A, comparator IC9B 6 between be connected on No. two branch roads by resistance 1R25, light-receiving end one end of described photoelectrical coupler 1G3 is connected to 3 pin of comparator IC9A, comparator IC9B 6 between, one end is connected on a branch road in addition, described transistor 1BG6 is connected 1 pin of communication interface CR1 jointly with No. three pins of transistor 1BG7, one end of described photoelectrical coupler 1G2 is connected between No. three pins of transistor 1BG4 and transistor 1BG5 by resistance 1R21, other one end of photoelectrical coupler 1G2 connects 2 pin of CR1 by No. three branch roads, described No. three branch roads are parallel with resistance 1R22, 1D1 and 1D5 of 1D2 and series connection mutually, described No. three branch roads also connect transistor 1BG4, No. three pins of transistor 1BG5, transistor 1BG6, No. three pins of transistor 1BG7 connect No. three branch roads by 1DLY2.
Visible by accompanying drawing, in the present invention, downstream signal adopts high breaking the bridge road isolation drive, positive and negative difference 30V NRZ, swinging of signal peak value is up to 60Vpp, upward signal adopts passive impedance detection (on/off state code element), network communication mode master-slave response mode is namely: active positive and negative difference 30V downlink call, the up answer of passive group road impedance state.
The downstream signal energy takes from instrument 30V DC/DC isolated variable power supply, there is driving force (the downhole anti-explosion essential safety parameter restriction of 200mA, 600mA can be accomplished in ground), this suspended power supply supply doube bridge road line driver, the non-relay network of 64 substations in driving 20 kilometers can be realized, interface chip and bridge circuit driver device high-speed photoelectric coupler are isolated, and insulate signal line and computer motherboard the common mode inhibition capacity of isolating and making it to have more than 1500V completely.
Upward signal is whole network group, each terminal is all without the need to auxiliary power unit, recall signal is with impedance conducting, cutoff characteristic conducts to central station, each terminal equivalent parallel several photoelectrical couplers together, during answering, signaling stops, bus is in spacing DC potential state, this current potential provides detection power supply for each terminal, any terminal is subject to photon-electron excitation all can generation current in the bus, the stateless that has that this electric current detects in master station had both reduced the answer information of terminal, each timeslice only allows single terminal end to use in the bus, express sequential to be assumed unified command of by central station.Owing to have employed passive photoelectric isolation, terminal equipment and communication bus is made to achieve electrical equipment completely isolated and have the common mode inhibition capacity tolerating more than 1500V.
Bus system of the present invention not only can random tree extension, also not to the rigors of cable resistance coupling, only be separated receiving area at interface current ring and have a leakage current balance resistance, in order to offset the leakage current interference of long-distance cable under the wet environment of down-hole, this resistance 50 Europe is suitable with cable resistance, without the need to adjusting again.
Drive axle road adopts similar BTL power amplifier to drive, operational amplifier is adopted to encourage two complementary transistors, make it the driving force with moment 30V/0.5A, front end, drive axle road adopts the photoelectrical coupler phase inverter of designed, designed, in order to do the use of 5V power supply and the isolation of 30V suspended power supply, there is high speed swinging characteristic, effectively can reduce intermodulation distortion and switching over loss, the control circuit arranged, automatically the access polarity of signal bus can be monitored, by the access polarity of photoelectric switch automatic switching signal bus and automatic Memory, base band bidirectional bus achieves the nonpolarity connection of two-wire system, even if there occurs polarity inversion in run duration bus, total system all can follow change automatically, overcome the trouble distinguishing wiring polarity by cable core color, user is simple and direct as illuminating line connects electric light, after instrument power down was lost efficacy to polar circuit automatically, electronic switch in instrument cuts off the electrical connection with bus automatically, any impact can not be produced to bus impedance.
Due to two wires of terminal communication circuit in system arbitrarily connect after the error probability of 50% all can be had to occur, this technology is called out the feature automatic decision of code according to communication protocol in information flow and is adjusted self access polarity, each interim of synchronous communication can insert a fixing interrogation reply cycle, just be transmitter absent-subscriber condition this moment, transmission level presents the duration of a static high level state data fields, use illustrated hardware time order circuit can detect answer field signal, if the reverse misconnection of bus, signal phase reverses, answer field level and become low level, testing circuit accurately can judge the access polarity of circuit accordingly, make whole network unification in identical polarity, as shown in the figure, signal input part uses a pair photoelectrical coupler of positive and negative two input directions, bus message input must via wherein one enter, two photoelectrical couplers can only have one, and to be access in another locked by electronic switch, the access right of two photoelectricity is locked by mnemon, the access state changing photoelectrical coupler just changes input signal polarity, the code element of supervisory signal input port, just polarity adjustment order is automatically sent when can't detect to answer field duration level and continue several week after date, trigger mnemon negate upset, input polarity is made to follow torsion, field signal is answered until can correctly receive, otherwise continue negate to control.After correctly receiving answer field level, testing circuit no longer exports trigger impulse, and mnemon just can remember this next state, if instrument not power down will keep polarity memory always.
Its operation principle is as follows:
The serial data transmitting terminal of C terminated communications chip (Z85C30, hereinafter referred to as communication chip) in Fig. 2, the Serial data receiving end of SI terminated communications chip, adopts the communication of SDLC principal and subordinate calling/response mode.
1, call out:
Call signal by the serial data output terminal of communication chip export namely in figure C hold, enter photoelectrical coupler 1G3, the TTL pulse enable signal G3 light-receiving end of beating follows signal generation conducting by change, it is connected across on bridge resistance, 1R26, the 1G3 of change can make bridge voltage follow drive singal to swing up and down, and be connected into A, B bis-groups of amplifiers of the IC9 of comparator, 2,5 pin are connected on the reference voltage of a 0.57V, this voltage is that the voltage divider be made up of 1R23,1R24 produces.Two groups of amplifiers export voltage reverse each other, amplify through the complementary emitter follower of excessive power, Transistor-Transistor Logic level is converted to+,-30V strong pulse signal of beating.
When C end is optocoupler 1G3 light-receiving end conducting during low level, 1R26 short circuit, amplifier 3,6 pin level is lower than 2,5 pin, and 7 pin are high level, and 1 pin is low level, and 1BG7,1BG4 end, and 1BG5,1BG6 conducting, 1 pin of CR1 is 30V, and 2 pin are 0V.
When C end is optocoupler 1G3 light-receiving end cut-off during high level, 1R26 is non-shorting, and amplifier 3,6 pin level is higher than 2,5 pin, and 7 pin are low level, and 1 pin is high level, 1BG7,1BG4 conducting, and 1BG5,1BG6 end, and 1 pin of CR1 is 0V, and 2 pin are 30V.
CR1 is connected on transmission line, and this baseband signal has extremely strong driving-energy, and peak-to-peak voltage is 60V, and short circuit current can reach 200mA, and therefore it has good interference free performance and extremely strong communication capacity.
Communication chip circuit is isolated by photoelectrical coupler and drive circuit, and the 30V power supply new chip power supply that communicates with 5V is also isolate separately, after abnormal voltage appears in outer circuit, can ensure instrument internal circuit safety.
2, receive:
During receiving terminal recall signal, terminal is upwards conducted with impedance conducting, cutoff characteristic, each terminal equivalent parallel several photoelectrical couplers together, during answering, signaling stops, bus is in spacing DC potential state, this current potential provides detection power supply for each terminal, any terminal is subject to photon-electron excitation all can generation current in the bus, by detecting the answer information of the presence or absence state reduction terminal of this electric current, each timeslice only allows single terminal end to use in the bus, and sequential is assumed unified command of by main website.
During reception information, 1 pin of CR1 is 0V, and 2 pin are close to 30V.When terminal answers information is for cut-off, bus loop no current, 1R22 both end voltage is that 0,1G2 luminous end is not luminous, and light-receiving end cut-off SI is high level.When terminal answers information is conducting, bus loop has electric current, and 1R22 both end voltage is luminous higher than 1.4V, 1G2 luminous end, and light-receiving end conducting, SI is low level.Restore terminal answers information like this.
1, Signal reception
(1) when 1 pin of CR1 be signal+, 2 pin be signal-time, through signal polarity testing circuit, HX is held and exports high level, GD104 conducting.
Now, when 1 pin of CR1 is 30V, when 2 pin are 0V, signal code is through R101, R110, GD104, D107, BG103, R109, GD102, D106, R102 flow to 2 pin of CR1, and GD102, BG102 conducting, RXD holds output low level and is sent to the signal receiving end of communication chip.When 1 pin of CR1 is 0V, when 2 pin are 30V, due to GD103 cut-off, GD102 is ended, and BG102 also ends, and RXD end exports high level and is sent to the signal receiving end of communication chip.
(2) when 2 pin of CR1 be signal+, 1 pin be signal-time, make HX hold output low level, GD103 conducting through signal polarity testing circuit.
Now, when 2 pin of CR1 are 30V, when 1 pin is 0V, signal code is through R102, R111, GD103, D108, BG103, R109, GD102, D106, R102 flow to 1 pin of CR1, and GD102, BG102 conducting, RXD holds output low level and is sent to the signal receiving end of communication chip.When 1 pin of CR1 is 30V, when 2 pin are 0V, due to GD104 cut-off, GD102 is ended, and BG102 also ends, and RXD end exports high level and is sent to the signal receiving end of communication chip.
Through said process, realize the reception of substation to main website call signal.
1, recall signal
After substation correctly receives called signal, enter interrogation reply cycle, during answering, TXKZ end is set to high level (being low level during non-answer) by CPU, the serial data output terminal of TXD terminated communications chip.
(1), during answering, when 1 pin of CR2 is 30V, when 2 pin are 0V, if TXD end is high level, BG101 ends, and in communication line, no current flows through, and belongs to the cut-off state of substation recall signal; If TXD end is low level, BG101 conducting, has electric current to flow through in communication line, belong to the conducting state of substation recall signal.Current flow paths enters communication line through 2 pin of 1 pin of CR2, R101, D101, BG101, D104, R102 arrival CR2 successively.
(2), during answering, when 1 pin of CR2 is 0V, when 2 pin are 30V, if TXD end is high level, BG101 ends, and in communication line, no current flows through, and belongs to the cut-off state of substation recall signal; If TXD end is low level, BG101 conducting, has electric current to flow through in communication line, belong to the conducting state of substation recall signal.Current flow paths enters communication line through 1 pin of 2 pin of CR2, R102, D103, BG101, D102, R101 arrival CR2 successively.
Through said process, answer data frame successively by the change of conducting, cut-off, is realized substation data and namely answers to the transmission of main website by substation.
Claims (5)
1. a tree-shaped remote communication bus system, comprise the aboveground communication system being positioned at ground and the underground communication system being positioned at underground, it is characterized in that: described aboveground communication system comprises the aboveground single-chip microcomputer be connected with host computer by signal conversion circuit, described aboveground single-chip microcomputer connects a communication call by aboveground communication chip and receives drive circuit, TTL call signal is converted to two-way NRZ by signal conversion circuit by described host computer, described underground communication system comprises signal receiving circuit and answer back circuit, signal receiving circuit is connected with a signal polarity testing circuit and a polarity control circuit, information transmission is carried out between signal polarity testing circuit and polarity control circuit, signal receiving circuit is also connected with a down-hole single-chip microcomputer by underground communica tion chip, described down-hole single-chip microcomputer is connected with a data acquisition translation circuit and can by data message under data acquisition translation circuit production wells, described underground communica tion chip is connected with answer back circuit and can to answer back circuit transmission information, phase-detection control circuit is connected between described signal receiving circuit with underground communica tion chip, phase-detection control circuit is by communication clock connecting downhole communication chip, described communication call receives drive circuit and is connected with signal receiving circuit and answer back circuit and can carries out information transmission, described down-hole monolithic also connection control output circuit and display circuit.
2. according to tree-shaped remote communication bus system according to claim 1, it is characterized in that: described signal conversion circuit, aboveground single-chip microcomputer and aboveground communication chip are by DC power supply.
3. according to tree-shaped remote communication bus system according to claim 1, it is characterized in that: described aboveground single-chip microcomputer is connected with state indication unit, communication call receives drive circuit and is connected with aboveground intrinsic safety electric source.
4. according to tree-shaped remote communication bus system according to claim 1, it is characterized in that: described answer back circuit connecting downhole intrinsic safety electric source.
5. according to tree-shaped remote communication bus system according to claim 1, it is characterized in that: described communication call receives drive circuit and comprises two port SI of communication chip Serial data receiving end on the port C of communication chip serial data transmitting terminal and connecting well on the comparator IC9A of reverse voltage and comparator IC9B and connecting well each other, the communication line of described port C connects photoelectrical coupler 1G3, the communication line of described port SI connects photoelectrical coupler 1G2, 1 pin of described comparator IC9A connects two pins of transistor 1BG4 and transistor 1BG5 simultaneously, 7 pin of described comparator IC9B connect two pins of transistor 1BG6 and transistor 1BG7 simultaneously, described transistor 1BG5 is connected by a branch road with two No. two pins of transistor 1BG7, transistor 1BG4 is connected by No. two branch roads with two No. two pins of transistor 1BG6, 2 pin of described comparator IC9A, be connected on a branch road by resistance 1R24 between 5 pin of comparator IC9B, 2 pin of comparator IC9A, also be connected on No. two branch roads by resistance 1R23 between 5 pin of comparator IC9B, 3 pin of described comparator IC9A, comparator IC9B 6 between be connected on a branch road by resistance 1R26, 3 pin of described comparator IC9A, comparator IC9B 6 between be connected on No. two branch roads by resistance 1R25, light-receiving end one end of described photoelectrical coupler 1G3 is connected to 3 pin of comparator IC9A, comparator IC9B 6 between, one end is connected on a branch road in addition, described transistor 1BG6 is connected 1 pin of communication interface CR1 jointly with No. three pins of transistor 1BG7, one end of described photoelectrical coupler 1G2 is connected between No. three pins of transistor 1BG4 and transistor 1BG5 by resistance 1R21, other one end of photoelectrical coupler 1G2 connects 2 pin of CR1 by No. three branch roads, described No. three branch roads are parallel with resistance 1R22, 1D1 and 1D5 of 1D2 and series connection mutually, described No. three branch roads also connect transistor 1BG4, No. three pins of transistor 1BG5, transistor 1BG6, No. three pins of transistor 1BG7 connect No. three branch roads by 1DLY2.
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| CN201410783838.2A CN104394054A (en) | 2014-12-16 | 2014-12-16 | Arborescence remote communication bus system |
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| CN201410783838.2A CN104394054A (en) | 2014-12-16 | 2014-12-16 | Arborescence remote communication bus system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105827554A (en) * | 2016-03-10 | 2016-08-03 | 重庆大学 | Optimization method and apparatus of matched resistance of flexray bus node |
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| US20110222682A1 (en) * | 2005-06-23 | 2011-09-15 | Agere Systems Inc. | Continuous Power Transfer Scheme for Two-Wire Serial Link |
| CN202810943U (en) * | 2012-09-07 | 2013-03-20 | 郑州创威煤安科技有限公司 | Coal mine safety monitoring system |
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| US20110222682A1 (en) * | 2005-06-23 | 2011-09-15 | Agere Systems Inc. | Continuous Power Transfer Scheme for Two-Wire Serial Link |
| CN2924672Y (en) * | 2006-06-14 | 2007-07-18 | 天津市泰华科技有限公司 | Pulse coding-decoding communication interface system with two-way data communication function |
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| CN105827554A (en) * | 2016-03-10 | 2016-08-03 | 重庆大学 | Optimization method and apparatus of matched resistance of flexray bus node |
| CN105827554B (en) * | 2016-03-10 | 2019-02-15 | 重庆大学 | A kind of optimization method and device of FlexRay bus node build-out resistor |
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Application publication date: 20150304 |