CN104618020A - Passive light splitting RS-485 optical fiber bus single-ported terminal - Google Patents
Passive light splitting RS-485 optical fiber bus single-ported terminal Download PDFInfo
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Abstract
The invention discloses a passive light splitting RS-485 optical fiber bus single-ported terminal which is characterized in that two ends of the terminal are connected with a passive RS-485 optical network local side of a passive light splitting RS-485 optical fiber bus and a terminal device respectively, the terminal comprises a power module, a photoelectric conversion module, a phase conversion circuit, an RS-485 driving chip, two high-speed optical coupling circuits, a non-polar automatic transmitting and receiving reversing circuit and a three-level lightning protection circuit, one end of the photoelectric conversion module is connected with one end of the phase conversion circuit, the other end of the photoelectric conversion module is connected with one end of the first high-speed optical coupling circuit and one end of the second high-speed optical coupling circuit, the other end of the first high-speed optical coupling circuit is connected with one end of the non-polar automatic transmitting and receiving reversing circuit and the RS-485 driving chip, and the other end of the non-polar automatic transmitting and receiving reversing circuit, the other end of the second high-speed optical coupling circuit and the three-level lightning protection circuit are connected with the RS-485 driving chip.
Description
Technical field
The present invention relates to industry manufacture field, be specifically related to a kind of passive light splitting RS-485 fiber buss single port terminal.
Background technology
Intelligent instrument grows up along with the maturation of singlechip technology at the beginning of the eighties, instrument market, the present world substantially monopolize by intelligent instrument.Tracing it to its cause is exactly the needs of IT application in enterprises, and enterprise's one of them necessary condition when instrument selection will have connected network communication interface exactly.Be that data analog signal exports simple procedure amount at first, instrumentation tap was RS-232 interface afterwards, and this interface can realize point-to-point communication mode, but this mode can not realize network savvy.The RS-485 occurred subsequently solves this problem.
RS-485 adopts differential signal negative logic, and-2V ~-6V represents " 0 ", and+2V ~+6V represents " 1 ".RS-485 has two-wire system and four-wire system two kinds of wiring, four-wire system can only realize point-to-point communication mode, now seldom adopt, now what adopt is the two-wire system mode of connection more, and to be that bus type topological structure is generally maximum on same bus can mount 32 nodes to this mode of connection.In RS-485 communication network, general employing is master-slave communication mode, and namely a main frame band is multiple from machine.With a pair twisted-pair feeder, " A ", " B " of each interface end is coupled together when connecting RS-485 communication link.
The bus type structure that traditional network topology generally adopts terminal to mate, does not support annular or star network.Networking medium mainly contains twisted-pair cable and optical fiber, and twisted-pair cable and optical fiber, when building network, have following problem:
(1) common mode disturbances: RS-485 interface adopts differential mode signal transmission mode, does not need to carry out detection signal relative to certain reference point, the potential difference that system only need detect between two lines is just passable.But people often ignore transceiver certain common-mode voltage range, RS-485 transceiver common-mode voltage range is-7 ~+12V, only has and meets above-mentioned condition, and whole network could normal work.The reliable and stable of communication will be affected when common-mode voltage in network line exceeds this scope, even damage interface.
(2) EMI: the co-moulded parts sent in driver output signal needs a return path, as the backward channel (signal ground) of neither one low-resistance, will return source in the form of radiation, whole bus will as a huge outside radiated electromagnetic wave of antenna.
(3) adopt a twisted-pair cable to make bus, each node is connected in series, should be as far as possible short to the length of lead-out wire of each node from bus, to make the impact of the reflected signal in lead-out wire on bus signals minimum.
(4) maximum communication distance adopting a twisted-pair cable to make bus is about 1219m, peak transfer rate is 10Mbps, transmission rate and transmission range are inversely proportional to, under the transmission rate of 100KbpS, just can reach maximum communication distance, if longer distance need be transmitted, need to add 485 repeaters.Along with the increase of transmission range, traffic rate can decline rapidly, can not ensure high-speed remote from communicating requirement.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, provide one at a distance, at a high speed, Large Copacity, employing RS-485 in conjunction with optical fiber communication, the passive light splitting RS-485 fiber buss single port terminal that communication reliability is high.
The technical scheme that the present invention is adopted for achieving the above object is:
A kind of passive light splitting RS-485 fiber buss single port terminal, the passive RS-485 optical network local side of its two ends difference connected with passive light splitting RS-485 fiber buss and subscriber terminal equipment, it comprises power module, photoelectric conversion module, phase conversion circuit, RS-485 driving chip, two high speed photo coupling circuit, nonpolarity automatic transceiving commutating circuit and three grades of lightning protection circuits, wherein, described photoelectric conversion module one end connects phase conversion circuit one end, the phase conversion circuit other end connects the first high speed photo coupling circuit on one side and the second high speed photo coupling circuit on one side, the first high speed photo coupling circuit other end connects nonpolarity automatic transceiving commutating circuit one end and RS-485 driving chip, the nonpolarity automatic transceiving commutating circuit other end connects RS-485 driving chip, the second high speed photo coupling circuit other end connects RS-485 driving chip, three grades of lightning protection circuits connect RS-485 driving chip.
It is by the conversion between light signal and bus logic signal, the control signal of RS-485 bus marco end is transferred to subscriber terminal equipment, controls subscriber terminal equipment; And the transfer of data fed back by subscriber terminal equipment is to RS-485 bus marco end.
After RS-485 bus marco end sends control signal, control signal is converted to light signal by passive RS-485 optical network local side, and be transmitted through the fiber to single port terminal, conversion between single port terminal light signal and bus logic signal, after light signal being converted to TTL logical signal " 0 " and " 1 ", be converted to RS-485 level signal through RS-485 driving chip, subscriber terminal equipment is controlled; Wherein to optical output signal should be had to be RS-485 bus logic " 0 " signal, corresponding is RS-485 bus logic " 1 " signal without optical output signal.
The data of terminal equipment feedback, after converting control signal to TTL logical signal " 0 " and " 1 " by single port terminal, then TTL logical signal is converted to light signal, wherein corresponding RS-485 bus logic " 0 " signal is for there being optical output signal, corresponding RS-485 bus logic " 1 " signal is without optical output signal, and light signal is transmitted through the fiber to passive RS-485 optical network local side, light signal is converted to RS-485 bus level or RS-232 level signal, then transfer to RS-485 bus marco end.
When subscriber terminal equipment does not receive the uploading data instruction that local side apparatus issues, single port terminal only can be in the state of intercepting, can not send any data to bus, the data sending request of all single port terminals is all by RS-485 main central parametric controller arbitration process.
Single port terminal when not sending data, i.e. RS-485 bus free, during for logical one (high level), the transmitter of UFIU UMSC Fiber Interface Unit can't send the laser of intensity; Single port terminal is when sending logical zero (low level), the launching opportunity of UFIU UMSC Fiber Interface Unit sends the laser of some strength, in order to represent logical zero, single port terminal is when sending logical one (high level), and the transmitter of UFIU UMSC Fiber Interface Unit can't send the laser of intensity.
Described photoelectric conversion module comprises transmitter unit and receiving element; Transmitter unit comprises laser driver and laser; Receiving element comprises photodiode and amplifies comparison circuit.
By there being light representations RS-485 bus logic " 0 " signal, without light representations RS-485 bus logic " 1 " signal; Bus apparatus is not when sending signal, the photoelectric conversion module Optical Transmit Unit of self all can not send exceed prescribed strength light signal out, namely when sending RS-485 bus logic " 1 ", transmitting arbitration functions be possessed, preventing that bus is chaotic and causing the fault that cannot communicate.
RS-485 bus is not when sending data, bus is forced logical one (high level) state, when sending logical one (high level) signal, RS485 bus level does not carry out saltus step, keeps logical one (high level) state; And when sending logical zero (low level), RS-485 bus is logical zero (low level) by the saltus step of high level logic level"1", after sending logical zero signal, bus logic state reverts to again logical one (high level) and keeps until the arrival of next logical zero signal.
Single port terminal is when RS-485 interface bus logic is level "0", after the process of bus phase conversion circuit, output logic high level " 1 " signal, now the laser driver drive laser of the Optical Transmit Unit of photoelectric conversion module sends the laser signal with some strength, and this signal is in order to represent RS-485 bus logic " 0 "; Single port terminal is when RS-485 interface bus logic is level"1", after phase conversion circuit process, output logic high level " 0 " signal, the laser driver of the Optical Transmit Unit of photoelectric conversion module drives cut-off, force laser not send laser signal, this signal condition represents RS-485 bus logic " 1 "; The photoelectric conversion module of single port terminal when light receiving unit has light to input, output low level " 1 ", after phase conversion circuit process, output logic high level " 0 " signal, makes control interface bus output logic " 0 " in RS-485, during input that the light receiving unit of the photoelectric conversion module of single port terminal is unglazed, output low level " 0 ", after phase conversion circuit process, output logic high level " 1 " signal, makes control interface bus output logic " 1 " in RS-485.
The invention has the beneficial effects as follows: single port terminal of the present invention, for the constructing communication network of point-to-multipoint, adopt planar waveguide-type optical branching device (PLC, its accessible site is among local side apparatus, also can independent of outside local side apparatus) spectroscopic modes direct passive transmission RS-485 signal, without the need to through protocol conversion, do not need to change original network architecture, compare and adopt TCP/IP Internet Transmission mode, whole system is very simple.Adopt the master of point-to-multipoint--from structure, passive RS-485 optical network local side is maximum can carry 128 nodes, can a carry 128*n network node by the RS-485 expansion interface cascade of n passive RS-485 optical network local side, greatly improve the message capacity of system.Point-to-point Fiber connection mode in the past needs two equipment interconnections, and now adopts the master of point-to-multipoint--and from optical fiber solutions, multiple subscriber terminal equipment shares a local side apparatus, and whole local side apparatus cost will be saved a lot mutually than ever.
Efficiently solve in prior art, common mode disturbances, EMI, communication distance problem, can transmit 10 kilometers to 40 kilometers (determining according to planar waveguide-type optical branching device splitting ratio); Traffic rate and the interactional problem of transmission range; The reflection that signal causes due to impedance discontinuity; Elevator system anti-lightning protective capacities, adopt all communication nodes of Fiber isolation, all RS-485 Optical Network Terminal all adopt three grades of superpower shocking preventing technologies simultaneously, thoroughly solve thunderbolt and endanger the destruction of whole system.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention;
Fig. 2 is bus system block diagram of the present invention;
Fig. 3 is phase conversion circuit of the present invention, RS-485 driving chip, two high speed photo coupling circuit, nonpolarity automatic transceiving commutating circuit and three grades of lightning protection circuit circuit diagrams;
Fig. 4 is power module circuitry figure of the present invention;
Fig. 5 is power isolation circuit figure of the present invention;
Fig. 6 is indicating circuit figure of the present invention;
Fig. 7 is peripheral circuit diagram of the present invention.
Embodiment
Embodiment: see Fig. 1 to Fig. 7, the present embodiment provides a kind of passive light splitting RS-485 fiber buss single port terminal, the passive RS-485 optical network local side of its two ends difference connected with passive light splitting RS-485 fiber buss and terminal equipment, it comprises power module, photoelectric conversion module, phase conversion circuit, RS-485 driving chip, two high speed photo coupling circuit, nonpolarity automatic transceiving commutating circuit and three grades of lightning protection circuits, wherein, described photoelectric conversion module one end connects phase conversion circuit one end, the phase conversion circuit other end connects the first high speed photo coupling circuit on one side and the second high speed photo coupling circuit on one side, the first high speed photo coupling circuit other end connects nonpolarity automatic transceiving commutating circuit one end and RS-485 driving chip, the nonpolarity automatic transceiving commutating circuit other end connects RS-485 driving chip, the second high speed photo coupling circuit other end connects RS-485 driving chip, three grades of lightning protection circuits connect RS-485 driving chip.
It is by the conversion between light signal and bus logic signal, the control signal of RS-485 bus marco end is transferred to subscriber terminal equipment, controls subscriber terminal equipment; And the transfer of data fed back by subscriber terminal equipment is to RS-485 bus marco end.
After RS-485 bus marco end sends control signal, control signal is converted to light signal by passive RS-485 optical network local side, and be transmitted through the fiber to single port terminal, conversion between single port terminal light signal and bus logic signal, after light signal being converted to TTL logical signal " 0 " and " 1 ", be converted to RS-485 level signal through RS-485 driving chip, subscriber terminal equipment is controlled; Wherein to optical output signal should be had to be RS-485 bus logic " 0 " signal, corresponding is RS-485 bus logic " 1 " signal without optical output signal.
The data of terminal equipment feedback, after converting control signal to TTL logical signal " 0 " and " 1 " by single port terminal, then TTL logical signal is converted to light signal, wherein corresponding RS-485 bus logic " 0 " signal is for there being optical output signal, corresponding RS-485 bus logic " 1 " signal is without optical output signal, and light signal is transmitted through the fiber to passive RS-485 optical network local side, light signal is converted to RS-485 bus level or RS-232 level signal, then transfer to RS-485 bus marco end.
When subscriber terminal equipment does not receive the uploading data instruction that local side apparatus issues, single port terminal only can be in the state of intercepting, can not send any data to bus, the data sending request of all single port terminals is all by RS-485 main central parametric controller arbitration process.
Single port terminal when not sending data, i.e. RS-485 bus free, during for logical one (high level), the transmitter of UFIU UMSC Fiber Interface Unit can't send the laser of intensity; Single port terminal is when sending logical zero (low level), the launching opportunity of UFIU UMSC Fiber Interface Unit sends the laser of some strength, in order to represent logical zero, single port terminal is when sending logical one (high level), and the transmitter of UFIU UMSC Fiber Interface Unit can't send the laser of intensity.
Described photoelectric conversion module comprises transmitter unit and receiving element; Transmitter unit comprises laser driver and laser; Receiving element comprises photodiode and amplifies comparison circuit.
By there being light representations RS-485 bus logic " 0 " signal, without light representations RS-485 bus logic " 1 " signal; Bus apparatus is not when sending signal, the photoelectric conversion module Optical Transmit Unit of self all can not send exceed prescribed strength light signal out, namely when sending RS-485 bus logic " 1 ", transmitting arbitration functions be possessed, preventing that bus is chaotic and causing the fault that cannot communicate.
RS-485 bus is not when sending data, bus is forced logical one (high level) state, when sending logical one (high level) signal, RS485 bus level does not carry out saltus step, keeps logical one (high level) state; And when sending logical zero (low level), RS-485 bus is logical zero (low level) by the saltus step of high level logic level"1", after sending logical zero signal, bus logic state reverts to again logical one (high level) and keeps until the arrival of next logical zero signal.
Single port terminal is when RS-485 interface bus logic is level "0", after the process of bus phase conversion circuit, output logic high level " 1 " signal, now the laser driver drive laser of the Optical Transmit Unit of photoelectric conversion module sends the laser signal with some strength, and this signal is in order to represent RS-485 bus logic " 0 "; Single port terminal is when RS-485 interface bus logic is level"1", after phase conversion circuit process, output logic high level " 0 " signal, the laser driver of the Optical Transmit Unit of photoelectric conversion module drives cut-off, force laser not send laser signal, this signal condition represents RS-485 bus logic " 1 "; The photoelectric conversion module of single port terminal when light receiving unit has light to input, output low level " 1 ", after phase conversion circuit process, output logic high level " 0 " signal, makes control interface bus output logic " 0 " in RS-485, during input that the light receiving unit of the photoelectric conversion module of single port terminal is unglazed, output low level " 0 ", after phase conversion circuit process, output logic high level " 1 " signal, makes control interface bus output logic " 1 " in RS-485.
The Main Function of high speed photo coupling buffer circuit and DC-DC insulating power supply module be isolate between RS-485 bus and photoelectric conversion module, the electrical connection of electric power system, photoelectric conversion module and electric power system can be protected.The function of nonpolarity automatic transceiving commutating circuit is the automatic switchover realizing RS-485 bus transceiving data, and be the enable control of a kind of time delay, circuit parameter, through careful design, effectively can avoid false triggering, avoids bus to produce mistake.Three grades of lightning protection networks its form three grades of high-performance anti thunder strike circuits, by IEC6100-4-54 grade standard by high-quality TVS Transient Suppression Diode, ceramic gas discharge tube, resettable fuse: 1.2/50us 4KV 8/20us 2KA.
The operation principle of passive light splitting RS-485 fiber buss system single port terminal is as follows: the photoelectric conversion module of single port terminal when light receiving unit has light to input, export high level " 1 ", after phase conversion circuit process, output logic high level " 0 " signal, make RS-485 bus output logic " 0 ", during input that the light receiving unit of the photoelectric conversion module of single port terminal is unglazed, output low level " 0 ", after phase conversion circuit process, output logic high level " 1 " signal, makes control interface bus output logic " 1 " in RS-485.Single port terminal is when RS-485 bus logic is level "0", after phase conversion circuit process, output logic high level " 1 " signal, high speed photo coupling is with isolated, now the laser driver drive laser of the Optical Transmit Unit of photoelectric conversion module sends the laser signal with some strength, and this signal is in order to represent RS-485 bus logic " 0 "; Single port terminal is when RS-485 bus logic is level"1", after phase conversion circuit process, output logic high level " 0 " signal, the laser driver of the Optical Transmit Unit of photoelectric conversion module drives cut-off, force laser not send laser signal, this signal condition represents RS-485 bus logic " 1 ";
The RS-485 drive circuit of passive light splitting RS-485 fiber buss system single port terminal has automatic reverse function, can switch transmission-receiving function automatically according to the state of data/address bus, it is by the operating state of the time delay of a sophisticated design enable control circuit control RS-485 bus driver.The RS-485 bus of single port terminal always can be in the state of intercepting when not sending data, and RS-485 driving chip can keep output high level, until the arrival of level "0", just state can be changed, the photoelectric conversion module of single port terminal when light receiving unit has light to input, export high level " 1 ", after phase conversion circuit process, output logic " 0 " (low level) signal, this signal delivers to automatic reversing circuit simultaneously, commutating circuit can export a high level " 1 " and (send enable high level effective to the transmission Enable Pin of RS-485 bus driver and reception Enable Pin, receive enable Low level effective), make driver effective, logical zero (low level) signal is transmitted to RS-485 bus, the photoelectric conversion module of single port terminal when the unglazed input of light receiving unit, output low level " 0 ", after phase conversion circuit process, output logic " 1 " (high level) signal, this signal delivers to automatic reversing circuit simultaneously, commutating circuit can export a logical zero (low level) and (send enable high level effective to the transmission Enable Pin of RS-485 bus driver and reception Enable Pin, receive enable Low level effective), allow driver without effectively, receiving enable is low level, RS-485 bus is in accepting state, the state of RS-485 bus determines state (being a high level logic one state) by the upper pull down resistor of bus, be equal to and transmit logical one (high level) signal to RS-485 bus.
But the foregoing is only better possible embodiments of the present invention, and be not used to limit to the scope of the claims of the present invention, therefore the equivalent step done of all utilizations description of the present invention and structural change, be all included in protection scope of the present invention.
Claims (8)
1. a passive light splitting RS-485 fiber buss single port terminal, it is characterized in that, the passive RS-485 optical network local side of its two ends difference connected with passive light splitting RS-485 fiber buss and terminal equipment, it comprises power module, photoelectric conversion module, phase conversion circuit, RS-485 driving chip, two high speed photo coupling circuit, nonpolarity automatic transceiving commutating circuit and three grades of lightning protection circuits, wherein, described photoelectric conversion module one end connects phase conversion circuit one end, the phase conversion circuit other end connects the first high speed photo coupling circuit on one side and the second high speed photo coupling circuit on one side, the first high speed photo coupling circuit other end connects nonpolarity automatic transceiving commutating circuit one end and RS-485 driving chip, the nonpolarity automatic transceiving commutating circuit other end connects RS-485 driving chip, the second high speed photo coupling circuit other end connects RS-485 driving chip, three grades of lightning protection circuits connect RS-485 driving chip.
2. passive light splitting RS-485 fiber buss single port terminal according to claim 1, it is characterized in that, it is by the conversion between light signal and bus logic signal, the control signal of RS-485 bus marco end is transferred to subscriber terminal equipment, controls subscriber terminal equipment; And the transfer of data fed back by subscriber terminal equipment is to RS-485 bus marco end.
3. passive light splitting RS-485 fiber buss single port terminal according to claim 1, it is characterized in that, after RS-485 bus marco end sends control signal, control signal is converted to light signal by passive RS-485 optical network local side, and be transmitted through the fiber to single port terminal, conversion between single port terminal light signal and bus logic signal, after light signal being converted to TTL logical signal " 0 " and " 1 ", be converted to RS-485 level signal through RS-485 driving chip, subscriber terminal equipment is controlled; Wherein to optical output signal should be had to be RS-485 bus logic " 0 " signal, corresponding is RS-485 bus logic " 1 " signal without optical output signal.
4. passive light splitting RS-485 fiber buss single port terminal according to claim 1, it is characterized in that, the data of subscriber terminal equipment feedback, after converting control signal to TTL logical signal " 0 " and " 1 " by single port terminal, then TTL logical signal is converted to light signal, wherein corresponding RS-485 bus logic " 0 " signal is for there being optical output signal, corresponding RS-485 bus logic " 1 " signal is without optical output signal, and light signal is transmitted through the fiber to passive RS-485 optical network local side, light signal is converted to RS-485 bus level or RS-232 level signal, then RS-485 bus marco end is transferred to.
5. passive light splitting RS-485 fiber buss single port terminal according to claim 1, it is characterized in that, when subscriber terminal equipment does not receive the uploading data instruction that local side apparatus issues, single port terminal only can be in the state of intercepting, can not send any data to bus, the data sending request of all single port terminals is all by RS-485 bus marco end arbitration process.
6. passive light splitting RS-485 fiber buss single port terminal according to claim 1, it is characterized in that, single port terminal when not sending data, i.e. RS-485 bus free, during for logical one (high level), the transmitter of UFIU UMSC Fiber Interface Unit can't send the laser of intensity; Single port terminal is when sending logical zero (low level), the launching opportunity of UFIU UMSC Fiber Interface Unit sends the laser of some strength, in order to represent logical zero, single port terminal is when sending logical one (high level), and the transmitter of UFIU UMSC Fiber Interface Unit can't send the laser of intensity.
7. passive light splitting RS-485 fiber buss single port terminal according to claim 1, it is characterized in that, described photoelectric conversion module comprises transmitter unit and receiving element; Transmitter unit comprises laser driver and laser; Receiving element comprises photodiode and amplifies comparison circuit.
8. passive light splitting RS-485 fiber buss single port terminal according to claim 1, is characterized in that, by there being light representations RS-485 bus logic " 0 " signal, without light representations RS-485 bus logic " 1 " signal; Bus apparatus is not when sending signal, the photoelectric conversion module Optical Transmit Unit of self all can not send exceed prescribed strength light signal out, namely when sending RS-485 bus logic " 1 ", transmitting arbitration functions be possessed, preventing that bus is chaotic and causing the fault that cannot communicate.
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| CN201410834077.9A CN104618020B (en) | 2014-12-29 | 2014-12-29 | A kind of passive fiber buss single port terminals of light splitting RS 485 |
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| CN201410834077.9A CN104618020B (en) | 2014-12-29 | 2014-12-29 | A kind of passive fiber buss single port terminals of light splitting RS 485 |
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| CN104618020B CN104618020B (en) | 2018-03-27 |
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| CN105429122A (en) * | 2015-11-16 | 2016-03-23 | 国网山东省电力公司济宁供电公司 | Non-polar RS485 protective adapter circuit |
| CN106950890A (en) * | 2017-04-28 | 2017-07-14 | 南京搜新智能科技有限公司 | Intelligent switching circuit based on double 485 communications |
| CN109448357A (en) * | 2018-12-29 | 2019-03-08 | 刘向宁 | Teledata collection copies fiber optic communications devices, collector and single line communication network system |
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| CN202872757U (en) * | 2012-10-31 | 2013-04-10 | 袁维益 | RS485 photoelectric communication conversion device |
| CN103236835A (en) * | 2013-04-09 | 2013-08-07 | 浙江威星智能仪表股份有限公司 | Signal isolation grid circuit |
| CN203300035U (en) * | 2013-04-25 | 2013-11-20 | 国家电网公司 | Acquirer and power utilization information acquiring system |
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| US20020065109A1 (en) * | 2000-11-29 | 2002-05-30 | Tapio Mansikkaniemi | Wireless terminal device with user interaction system |
| US20090313299A1 (en) * | 2008-05-07 | 2009-12-17 | Bonev Robert | Communications network system and service provider |
| CN202872757U (en) * | 2012-10-31 | 2013-04-10 | 袁维益 | RS485 photoelectric communication conversion device |
| CN103236835A (en) * | 2013-04-09 | 2013-08-07 | 浙江威星智能仪表股份有限公司 | Signal isolation grid circuit |
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| CN105429122A (en) * | 2015-11-16 | 2016-03-23 | 国网山东省电力公司济宁供电公司 | Non-polar RS485 protective adapter circuit |
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| CN106950890A (en) * | 2017-04-28 | 2017-07-14 | 南京搜新智能科技有限公司 | Intelligent switching circuit based on double 485 communications |
| CN109448357A (en) * | 2018-12-29 | 2019-03-08 | 刘向宁 | Teledata collection copies fiber optic communications devices, collector and single line communication network system |
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| Publication number | Publication date |
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| CN104618020B (en) | 2018-03-27 |
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