CN104753596A - Multi-port terminal of passive beam splitting RS-485 optical fiber bus - Google Patents
Multi-port terminal of passive beam splitting RS-485 optical fiber bus Download PDFInfo
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Abstract
The invention discloses a multi-port terminal of a passive beam splitting RS-485 optical fiber bus. The multi-port terminal is characterized in that the two ends of the multi-port terminal are connected with passive RS-485 optical network local sides of the passive beam splitting RS-485 optical fiber bus and user terminal devices, the multi-port terminal comprises a power supply module, a bus arbitration processor, a plurality of optical conversion modules, a plurality of high-speed optical couplers, multiple RS-485 interface units, two RS-485 cascading interface circuits, two optical fiber cascading interface circuits, multiple routes of RS-485 drive chips, multiple three-stage lightning protection circuits and an optical fiber uplink port circuit, the optical conversion modules, the two RS-485 cascading interface circuits and the high-speed optical couplers are connected with the bus arbitration processor, the optical uplink port circuit and two optical fiber cascading interfaces are connected with the optical conversion modules, and the RS-485 drive chips are connected with the high-speed optical couplers and the three-stage lightning prevention circuits.
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 many mouthfuls of terminals.
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, passive light splitting RS-485 fiber buss many mouthfuls of terminals 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 many mouthfuls of terminals, 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, bus arbitration processor, multiple smooth modular converter, multiple high speed photo coupling, multichannel RS-485 interface unit, two-way RS-485 subtending port circuit, two-way optical fiber subtending port circuit, multiple RS-485 driving chip, multichannel three grades of lightning protection circuits and a road uplink optical fiber mouth circuit, wherein, described multiple smooth modular converter, one road RS-485 subtending port circuit is connected bus arbitration processor with multiple high speed photo coupling, uplink optical fiber mouth circuit is connected light modular converter with two-way optical fiber subtending port, multiple RS-485 driving chip connects multiple high speed photo coupling and multichannel three grades of lightning protection circuits.
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 many mouthfuls of terminals, conversion between many mouthfuls of terminal light signals 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 subscriber terminal equipment feedback, after converting control signal to TTL logical signal " 0 " and " 1 " by many mouthfuls of terminals, 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, many mouthfuls of terminals only can be in the state of intercepting, can not send any data to bus, the data sending request of all many mouthfuls of terminals is all by RS-485 main central parametric controller arbitration process.
Many mouthfuls of terminals 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; Many mouthfuls of terminals are 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, many mouthfuls of terminals are 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.
Described two-way RS-485 subtending port circuit is the RS-485 subtending port circuit expanded for short distance cascade, and two-way optical fiber subtending port circuit is the optical fiber subtending port circuit expanded for remote cascade.
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 logical one (high level) saltus step, 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.
Many mouthfuls of terminals are when RS-485 interface bus is logical zero (low level), after the process of bus phase conversion circuit, output logic " 1 " (high level) 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 "; Many mouthfuls of terminals are when RS-485 interface bus is logical one (high level), after phase conversion circuit process, output logic " 0 " (low level) 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 many mouthfuls of terminals when light receiving unit has light to input, export high level " 1 ", after phase conversion circuit process, output logic " 0 " (low level) signal, make control interface bus output logic " 0 " in RS-485, during input that the light receiving unit of the photoelectric conversion module of many mouthfuls of terminals is unglazed, output low level " 0 ", after phase conversion circuit process, output logic " 1 " (high level) signal, makes RS-485 interface bus output logic " 1 ".
The effect of many mouthfuls of terminals is that the message returned by multiple subscriber terminal equipment is sent to machine room center controlling platform by many mouthfuls of terminals.Many mouthfuls of terminals are generally placed on has multiple subscriber terminal equipment occasion.Whole system is between machine room center controlling platform (as long-distance meter-reading system platform) and user terminal, realize being electrically connected at a distance, at a high speed, with optical fiber thorough quarantine center machine room local side apparatus and user terminal, improve the communication reliability of system.
The function of the uplink optical fibers interface of many mouthfuls of terminals and the photoelectric conversion module of cascaded optical fiber interface realizes the signal of telecommunication to convert light signal and key element light signal being converted to the signal of telecommunication to, and it is made up of Optical Transmit Unit and light receiving unit.Optical Transmit Unit is respectively by laser drive circuit and laser constitution; Light receiving unit is made up of photodetector, amplifying circuit and high-speed comparator respectively.
The invention has the beneficial effects as follows: many mouthfuls of terminals 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 bus arbitration processor cpu circuit figure;
Fig. 4 is bus arbitration processor reset circuit diagram;
Fig. 5 is bus arbitration processor clock circuit diagram;
Fig. 6 is bus arbitration processor process chip power filter and decoupling circuit figure;
Fig. 7 is bus arbitration processor DLL (dynamic link library) circuit diagram;
Fig. 8 is bus arbitration processor toggle switch circuit diagram;
Fig. 9 is bus arbitration processor interface expanded circuit figure;
Figure 10 is RS-485 interface unit 1 circuit diagram;
Figure 11 is RS-485 interface unit 2 circuit diagram;
Figure 12 is RS-485 interface unit 3 circuit diagram;
Figure 13 is RS-485 interface unit 4 circuit diagram;
Figure 14 is RS-485 interface unit 5 circuit diagram;
Figure 15 is RS-485 interface unit 6 circuit diagram;
Figure 16 is RS-485 interface unit 7 circuit diagram;
Figure 17 is RS-485 interface unit 8 circuit diagram;
Figure 18 is RS-485 subtending port 1 circuit diagram;
Figure 19 is RS-485 subtending port 2 circuit diagram;
Figure 20 is optical fiber subtending port 1 circuit diagram;
Figure 21 is optical fiber subtending port 2 circuit diagram;
Figure 22 is uplink optical fiber mouth circuit diagram;
Figure 23 is power module circuitry figure.
Embodiment
Embodiment: see Fig. 1 to Fig. 7, the present embodiment provides a kind of passive light splitting RS-485 fiber buss many mouthfuls of terminals, 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, bus arbitration processor, multiple smooth modular converter, multiple high speed photo coupling, 8 road RS-485 interface units, two-way RS-485 subtending port circuit, two-way optical fiber subtending port circuit, multiple RS-485 driving chip, multichannel three grades of lightning protection circuits and a road uplink optical fiber mouth circuit, wherein, described multiple smooth modular converter, one road RS-485 subtending port circuit is connected bus arbitration processor with multiple high speed photo coupling, uplink optical fiber mouth circuit is connected light modular converter with two-way optical fiber subtending port, multiple RS-485 driving chip connects multiple high speed photo coupling and multichannel three grades of lightning protection circuits.
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 many mouthfuls of terminals, conversion between many mouthfuls of terminal light signals 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 subscriber terminal equipment feedback, after converting control signal to TTL logical signal " 0 " and " 1 " by many mouthfuls of terminals, 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, many mouthfuls of terminals only can be in the state of intercepting, and can not send any data to bus, and the data sending request of all many mouthfuls of terminals is all by RS-485 bus marco end arbitration process.
Many mouthfuls of terminals 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; Many mouthfuls of terminals are 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, many mouthfuls of terminals are 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.
Described two-way RS-485 subtending port circuit is the RS-485 subtending port circuit expanded for short distance cascade, and two-way optical fiber subtending port circuit is the optical fiber subtending port circuit expanded for remote cascade.
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 logical one (high level) saltus step, 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.
Many mouthfuls of terminals are when RS-485 interface bus logic is level "0", after the process of bus phase conversion circuit, output logic " 1 " (high level) 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 "; Many mouthfuls of terminals are when RS-485 interface bus is logical one (high level), after phase conversion circuit process, output logic " 0 " (low level) 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 many mouthfuls of terminals when light receiving unit has light to input, output logic " 1 " (high level), after phase conversion circuit process, output logic " 0 " (low level) signal, make control interface bus output logic " 0 " in RS-485, during input that the light receiving unit of the photoelectric conversion module of many mouthfuls of terminals is unglazed, output logic " 0 " (low level), after phase conversion circuit process, output logic " 1 " (high level) signal, makes control interface bus output logic " 1 " (high level) in RS-485.
The effect of many mouthfuls of terminals is that the message returned by multiple subscriber terminal equipment is sent to machine room center controlling platform by many mouthfuls of terminals.Many mouthfuls of terminals are generally placed on has multiple subscriber terminal equipment occasion.Whole system is between machine room center controlling platform (as long-distance meter-reading system platform) and user terminal, realize being electrically connected at a distance, at a high speed, with optical fiber thorough quarantine center machine room local side apparatus and user terminal, improve the communication reliability of system.
The function of the uplink optical fibers interface of many mouthfuls of terminals and the photoelectric conversion module of cascaded optical fiber interface realizes the signal of telecommunication to convert light signal and key element light signal being converted to the signal of telecommunication to, and it is made up of Optical Transmit Unit and light receiving unit.Optical Transmit Unit is respectively by laser drive circuit and laser constitution; Light receiving unit is made up of photodetector, amplifying circuit and high-speed comparator respectively.
The high speed photo coupling buffer circuit of RS-485 interface unit and the Main Function of 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 many mouthfuls of terminals is as follows: many mouthfuls of terminals are when RS-485 interface unit bus logic is level "0", after the process of bus arbitration processor, output logic " 1 " (high level) signal, the now laser driver drive laser of the Optical Transmit Unit of uplink optical fibers interface photoelectric conversion module, send the laser signal with some strength, this signal is in order to represent RS-485 bus logic " 0 "; Many mouthfuls of terminals are when RS-485 interface unit bus logic " 1 " (high level), after the process of bus arbitration processor, output logic " 0 " (low level) signal, the laser driver of the Optical Transmit Unit of uplink optical fibers interface photoelectric conversion module drives cut-off, force laser not send laser signal, this signal condition represents RS-485 bus logic " 1 "; Uplink optical fibers interface photoelectric conversion module when light receiving unit has light to input, output logic " 1 " (high level), after the process of bus arbitration processor, output logic " 0 " (low level) signal, make RS-485 interface unit bus output logic " 0 ", during input that the light receiving unit of the photoelectric conversion module of many mouthfuls of terminals is unglazed, output logic " 0 " (low level), after the process of bus arbitration processor, output logic " 1 " (high level) signal, makes RS-485 interface unit bus output logic " 1 ".
The RS-485 interface unit of passive light splitting RS-485 fiber buss system many mouthfuls of terminals 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 many mouthfuls of terminals 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 logical zero (low level), just state can be changed, the photoelectric conversion module of uplink optical fibers interface is when light receiving unit has light to input, output logic " 1 " (high level), after the process of bus arbitration processor, output logic " 0 " (low level) signal, this signal delivers to automatic reversing circuit simultaneously, commutating circuit meeting output logic " 1 " (high level) (sends enable high level effective to the transmission Enable Pin of RS-485 bus driver with 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 uplink optical fibers interface when the unglazed input of light receiving unit, output logic " 0 " (low level), after the process of bus arbitration processor, 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 level"1" logical signal to RS-485 bus.
Between two RS-485 cascade expansion interfaces of passive light splitting RS-485 fiber buss system many mouthfuls of terminals, between two optical fiber cascade expansion interfaces, and there is no exchanges data between RS-485 cascade expansion interface and between optical fiber cascade expansion interface, be a kind of Bus isolation state, they only have the exchange of data between meeting and uplink optical fibers interface.
The communication mode of RS-485 cascade expansion interface and uplink optical fibers interface is with RS-485 interface unit and the communication mode with uplink optical fibers interface.
The photoelectric conversion module of any one optical fiber cascade expansion interface when light receiving unit has light to input, output logic " 1 " (high level), this RS-485 bus representing the subscriber terminal equipment of bottom transfers a logical zero signal and comes, the input being transparent to uplink optical fibers interface Optical Transmit Unit for this signal bus arbitration processor, now the laser driver drive laser of the Optical Transmit Unit of uplink optical fibers interface photoelectric conversion module sends the laser signal with some strength, the RS-485 bus logic " 0 " that this signal sends in order to representative of consumer terminal equipment, when optical fiber cascade expansion interface photoelectric conversion module light receiving unit not light input time, output logic " 0 " low level, this RS-485 bus representing the subscriber terminal equipment of bottom transfers a logical one signal and comes, the input being transparent to uplink optical fibers interface Optical Transmit Unit for this signal bus arbitration processor, now the laser driver of the Optical Transmit Unit of uplink optical fibers interface photoelectric conversion module not drive laser send laser signal, this state is used for the RS-485 bus logic " 1 " that representative of consumer terminal equipment sends.
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 (9)
1. a passive light splitting RS-485 fiber buss many mouthfuls of terminals, 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 subscriber terminal equipment, it comprises power module, bus arbitration processor, multiple smooth modular converter, multiple high speed photo coupling, multichannel RS-485 interface unit, two-way RS-485 subtending port circuit, two-way optical fiber subtending port circuit, multiple RS-485 driving chip, multichannel three grades of lightning protection circuits and a road uplink optical fiber mouth circuit, wherein, described multiple smooth modular converter, one road RS-485 subtending port circuit is connected bus arbitration processor with multiple high speed photo coupling, uplink optical fiber mouth circuit is connected light modular converter with two-way optical fiber subtending port, multiple RS-485 driving chip connects multiple high speed photo coupling and multichannel three grades of lightning protection circuits.
2. passive light splitting RS-485 fiber buss according to claim 1 many mouthfuls of terminals, 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 according to claim 1 many mouthfuls of terminals, 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 many mouthfuls of terminals, conversion between many mouthfuls of terminal light signals 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 according to claim 1 many mouthfuls of terminals, it is characterized in that, the data of subscriber terminal equipment feedback, after converting control signal to TTL logical signal " 0 " and " 1 " by many mouthfuls of terminals, 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 according to claim 1 many mouthfuls of terminals, it is characterized in that, when subscriber terminal equipment does not receive the uploading data instruction that local side apparatus issues, many mouthfuls of terminals only can be in the state of intercepting, can not send any data to bus, the data sending request of all many mouthfuls of terminals is all by RS-485 main central parametric controller arbitration process.
6. passive light splitting RS-485 fiber buss according to claim 1 many mouthfuls of terminals, it is characterized in that, many mouthfuls of terminals 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; Many mouthfuls of terminals are 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, many mouthfuls of terminals are 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 according to claim 1 many mouthfuls of terminals, 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 according to claim 1 many mouthfuls of terminals, 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.
9. passive light splitting RS-485 fiber buss according to claim 1 many mouthfuls of terminals, it is characterized in that, described two-way RS-485 subtending port circuit, for the RS-485 subtending port circuit expanded for short distance cascade, two-way optical fiber subtending port circuit is the optical fiber subtending port circuit expanded for remote cascade.
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| CN106059876A (en) * | 2016-06-22 | 2016-10-26 | 重庆世纪之光科技实业有限公司 | Mode switching control method, device and system for unidirectional serial bus network |
| CN111045973A (en) * | 2018-10-15 | 2020-04-21 | 新唐科技股份有限公司 | Integrated circuit, bus system and control method thereof |
| CN112949247A (en) * | 2021-02-01 | 2021-06-11 | 上海天数智芯半导体有限公司 | Phase-based on-chip bus scheduling device and method |
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| CN102064904B (en) * | 2009-11-12 | 2013-09-11 | 华为技术有限公司 | Service transmission method, system and device of multi-service shared optical distribution network (ODN) |
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