CN104753596B - A kind of passive many mouthfuls of terminals of the fiber buss of light splitting RS 485 - Google Patents
A kind of passive many mouthfuls of terminals of the fiber buss of light splitting RS 485 Download PDFInfo
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- CN104753596B CN104753596B CN201410837393.1A CN201410837393A CN104753596B CN 104753596 B CN104753596 B CN 104753596B CN 201410837393 A CN201410837393 A CN 201410837393A CN 104753596 B CN104753596 B CN 104753596B
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Abstract
The invention discloses a kind of passive many mouthfuls of terminals of the fiber buss of light splitting RS 485, it is characterized in that, the optical network local sides of passive RS 485 and subscriber terminal equipment of the fiber buss of its two ends difference connected with passive light splitting RS 485, it includes power module, bus arbitration processor, multiple smooth modular converters, multiple high speed photo couplings, the interface units of multichannel RS 485, the subtending port circuits of two-way RS 485, two-way optical fiber subtending port circuit, multiple driving chips of RS 485, multichannel three-level lightning protection circuit and all the way uplink optical fiber mouthful circuit, wherein, the multiple smooth modular converter, the subtending port circuits of two-way RS 485 and multiple high speed photo couplings connection bus arbitration processor, uplink optical fiber mouthful circuit and two-way optical fiber subtending port connection light modular converter, multiple driving chips of RS 485 connect multiple high speed photo couplings and multichannel three-level lightning protection circuit.
Description
Technical field
The present invention relates to industry manufacture field, and in particular to a kind of passive many mouthfuls of terminals of light splitting RS-485 fiber buss.
Background technology
Intelligence instrument is grown up with the maturation of singlechip technology at the beginning of the eighties, present world's instrument market base
This is monopolized by intelligence instrument.Trace it to its cause the need for being exactly IT application in enterprises, in instrument selection, one of those must for enterprise
Condition is wanted to seek to connected network communication interface.It is initially data analog signal output simple procedure amount, later instrumentation tap is
RS-232 interface, this interface can realize point-to-point communication mode, but this mode can not realize network savvy.Then go out
Existing RS-485 solves this problem.
RS-485 uses differential signal negative logic, and -2V~-6V represents " 0 " that+2V~+6V is represented " 1 ".RS-485 has two lines
System and two kinds of wiring of four-wire system, four-wire system can only realize point-to-point communication mode, now seldom use, now to use two more
The line mode of connection, this mode of connection is that bus type topological structure typically can at most mount 32 knots on same bus
Point.The multiple slaves of the host tape of master-slave communication mode, i.e., one are generally adopted by RS-485 communication networks.Connect RS-485
" A ", " B " end of each interface is connected with a pair of twisted-pair feeders during communication link.
Traditional network topology typically uses the bus type structure of terminal coupling, and annular or star network are not supported.Networking
Medium mainly has twisted-pair cable and optical fiber, and twisted-pair cable and optical fiber are when building network, with following problem：
(1) common mode disturbances：RS-485 interfaces transmit aspect using differential mode, and need not be relative to some reference
Point detects signal, and system need to only detect that potential difference between two lines just can be with.But people, which often ignore transceiver, one
Fixed common-mode voltage range, RS-485 transceivers common-mode voltage range is -7~+12V, only meets above-mentioned condition, whole network
Could normal work.The reliable and stable of communication will be influenceed when common-mode voltage exceeds this scope in network line, or even is damaged
Interface.
(2)EMI：The common mode part sent in driver output signal needs a return path, such as neither one low-resistance
Backward channel (signal ground), source will be returned in the form of radiation, whole bus will be outside as a huge antenna
Radiated electromagnetic wave.
(3) bus is made using a twisted-pair cable, each node be connected in series, from bus to the extraction of each node
Line length should be as far as possible short, to make influence of the reflected signal in lead-out wire to bus signals minimum.
(4) the maximum communication distance about 1219m of bus is made using a twisted-pair cable, peak transfer rate is
10Mbps, transmission rate is inversely proportional with transmission range, under 100KbpS transmission rate, can just reach maximum communication away from
From if longer distance need to be transmitted, it is necessary to plus 485 repeaters.With the increase of transmission range, traffic rate can rapidly under
Drop, do not ensure that high-speed remote from communicating requirement.
The content of the invention
The purpose of the present invention is in view of the shortcomings of the prior art there is provided a kind of remote, high speed, Large Copacity, using RS-
485 combine fiber optic communication, the high many mouthfuls of terminals of passive light splitting RS-485 fiber buss of communication reliability.
The technical scheme that is used to achieve the above object of the present invention for：
A kind of many mouthfuls of terminals of passive light splitting RS-485 fiber buss, its two ends difference connected with passive light splitting RS-485 optical fiber is total
The passive RS-485 optical network local sides and subscriber terminal equipment of line, it includes power module, and bus arbitration processor, multiple light turn
Change the mold block, multiple high speed photo couplings, multichannel RS-485 interface units, two-way RS-485 subtending port circuits, the level connection of two-way optical fiber
Mouth circuit, multiple RS-485 driving chips, multichannel three-level lightning protection circuit and all the way uplink optical fiber mouthful circuit, wherein, it is the multiple
Light modular converter, all the way RS-485 subtending ports circuit and multiple high speed photo couplings connection bus arbitration processor, uplink optical fiber mouthful
Circuit and two-way optical fiber subtending port connection light modular converter, multiple RS-485 driving chips connect multiple high speed photo couplings and multichannel
Three-level lightning protection circuit.
It is transmitted the control signal at RS-485 bus marcos end by the conversion between optical signal and bus logic signal
To subscriber terminal equipment, subscriber terminal equipment is controlled；And, the data transfer that subscriber terminal equipment is fed back to RS-
485 bus marco ends.
RS-485 bus marcos end is sent after control signal, is converted into control signal by passive RS-485 optical network local sides
Optical signal, and many mouthfuls of terminals are transmitted through the fiber to, light is believed in the conversion between many mouthfuls of terminal optical signals and bus logic signal
Number it is converted into behind TTL logical signals " 0 " and " 1 ", RS-485 level signals is converted to through RS-485 driving chips, to user terminal
Equipment is controlled；Wherein to that should have optical output signal to be RS-485 bus logics " 0 " signal, correspondence is without optical output signal
RS-485 bus logics " 1 " signal.
Subscriber terminal equipment feedback data, by many mouthfuls of terminals by control signal be converted into TTL logical signals " 0 " and
After " 1 ", TTL logical signals are then converted into optical signal, wherein corresponding RS-485 bus logic " 0 " signal is to have light output letter
Number, correspondence RS-485 bus logic " 1 " signal is to be transmitted through the fiber to passive RS-485 without optical output signal, and by optical signal
Optical network local side, converts optical signals into RS-485 bus levels or RS-232 level signals, is then transmit to RS-485 total
Line traffic control end.
When subscriber terminal equipment is not received by the upload data command that local side apparatus is issued, many mouthfuls of terminals can only be in and detect
State is listened, any data will not be sent to bus, the data sending request of all many mouthfuls of terminals is all by RS-485 main central controls
Platform arbitration process processed.
Many mouthfuls of terminals are not when sending data, i.e. RS-485 bus frees, when being logical one (high level), optical interface list
The emitter of member can't send the laser of intensity；Many mouthfuls of terminals send logical zero (low level) when, UFIU UMSC Fiber Interface Unit
Launching opportunity sends the laser of some strength, to represent logical zero, many mouthfuls of terminals when sending logical one (high level),
The emitter of UFIU UMSC Fiber Interface Unit can't send the laser of intensity.
The photoelectric conversion module includes transmitter unit and receiving unit；Transmitter unit includes laser driver and laser
Device；Receiving unit includes photodiode and zoom comparison circuit.
By having light representations RS-485 bus logics " 0 " signal, no light representations RS-485 bus logics " 1 " signal；Bus
Equipment is not when sending signal, and the photoelectric conversion module Optical Transmit Unit of itself can not send the optical signal more than prescribed strength
Out, i.e., to possess transmitting arbitration functions when sending RS-485 bus logics " 1 ", prevent that bus is chaotic and causes nothing
The failure of method communication.
The two-way RS-485 subtending port circuits, to cascade the RS-485 subtending port circuits of extension for short distance,
Two-way optical fiber subtending port circuit, for the optical fiber subtending port circuit for cascading extension at a distance.
RS-485 buses are not when sending data, and bus is forced logical one (high level) state, when transmission logic
During " 1 " (high level) signal, RS485 bus levels keep logical one (high level) state without saltus step；And when transmission is patrolled
When volume " 0 " (low level), RS-485 buses are logical zero (low level) by logical one (high level) saltus step, when having sent logic
After " 0 " signal, bus logic state reverts to logical one (high level) again and maintained until next logical zero signal is arrived
Come.
Many mouthfuls of terminals are handled when RS-485 interface bus is logical zero (low level) by bus phase conversion circuit
Afterwards, logical one (high level) signal is exported, now the laser driver driving laser of the Optical Transmit Unit of photoelectric conversion module
Device sends the laser signal with some strength, and the signal is to represent RS-485 bus logics " 0 "；Many mouthfuls of terminals are in RS-485
When interface bus is logical one (high level), after phase conversion circuit is handled, logical zero (low level) signal, light are exported
The laser driver driving cut-off of the Optical Transmit Unit of electric modular converter, forces laser not send laser signal, the signal
Status representative RS-485 bus logics " 1 "；The photoelectric conversion module of many mouthfuls of terminals when light receiving unit has light input, output
High level " 1 ", after phase conversion circuit is handled, exports logical zero (low level) signal, makes to control interface bus in RS-485
Logical zero is exported, during input that the light receiving unit of the photoelectric conversion module of many mouthfuls of terminals is unglazed, low level " 0 " is exported, by phase
After the change-over circuit processing of position, logical one (high level) signal is exported, RS-485 interface bus is exported logical one.
The effect of many mouthfuls of terminals is that the message for returning multiple subscriber terminal equipments is sent in computer room by many mouthfuls of terminals
Entreat control platform.Many mouthfuls of terminals are generally placed upon with multiple subscriber terminal equipment occasions.Whole system is controlled between computer room center
Platform (such as long-distance meter-reading system platform) between user terminal, realize it is remote, at a high speed, with the thorough quarantine center's computer room of optical fiber
Local side apparatus and user terminal electrical connection, 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 is to realize electric signal
It is converted into optical signal and converts optical signals into the key element of electric signal, 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 respectively by photodetector, amplifying circuit
With high-speed comparator composition.
The beneficial effects of the invention are as follows：The many mouthfuls of terminals of the present invention, are the constructing communication network of point-to-multipoint, using slab guide
Type optical branching device (PLC, it can be integrated among local side apparatus, can also be independently of local side apparatus outside) the direct nothing of spectroscopic modes
RS-485 signals are transmitted in source, need not move through protocol conversion, it is not necessary to change original network architecture, compared to using TCP/IP networks
Transmission means, whole system very simple.Using the master of point-to-multipoint -- from structure, a passive RS-485 optical network local side is most
Greatly can 128 nodes of carry, can be with carry 128* by the RS-485 expansion interfaces cascade of n passive RS-485 optical network local sides
N network node, greatly improves the message capacity of system.Conventional point-to-point optical fiber connected mode needs two equipment pair
Connect, and now using point-to-multipoint master -- from optical fiber solutions, multiple subscriber terminal equipments share a local side apparatus, and entirely
Local side apparatus cost is many compared to save in the past.
Efficiently solve in the prior art, common mode disturbances, EMI, communication distance problem can transmit 10 kilometers to 40 kilometers
(depending on planar waveguide-type optical branching device splitting ratio)；The problem of traffic rate influences each other with transmission range；Signal due to
The reflection that impedance discontinuity is caused；Lifting system anti-lightning protective capacities, using all communication nodes of Fiber isolation, owns simultaneously
RS-485 ONT Optical Network Terminals use the superpower shocking preventing technology of three-level, thoroughly solve destruction of the thunderbolt to whole system and endanger.
Brief description of the drawings
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 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 the circuit diagram of RS-485 interface units 1；
Figure 11 is the circuit diagram of RS-485 interface units 2；
Figure 12 is the circuit diagram of RS-485 interface units 3；
Figure 13 is the circuit diagram of RS-485 interface units 4；
Figure 14 is the circuit diagram of RS-485 interface units 5；
Figure 15 is the circuit diagram of RS-485 interface units 6；
Figure 16 is the circuit diagram of RS-485 interface units 7；
Figure 17 is the circuit diagram of RS-485 interface units 8；
Figure 18 is the circuit diagram of RS-485 subtending ports 1；
Figure 19 is the circuit diagram of RS-485 subtending ports 2；
Figure 20 is the circuit diagram of optical fiber subtending port 1；
Figure 21 is the circuit diagram of optical fiber subtending port 2；
Figure 22 is uplink optical fiber mouthful circuit diagram；
Figure 23 is power module circuitry figure.
Embodiment
Embodiment：Referring to Fig. 1 to Fig. 7, the present embodiment provides a kind of passive many mouthfuls of terminals of light splitting RS-485 fiber buss, its
The passive RS-485 optical network local sides and subscriber terminal equipment of connected with passive light splitting RS-485 fiber buss are distinguished in two ends, and it includes
Power module, bus arbitration processor, multiple smooth modular converters, multiple high speed photo couplings, 8 road RS-485 interface units, two-way RS-
485 subtending port circuits, two-way optical fiber subtending port circuit, multiple RS-485 driving chips, multichannel three-level lightning protection circuit and one
Road uplink optical fiber mouthful circuit, wherein, the multiple smooth modular converter, all the way RS-485 subtending ports circuit and multiple high speed photo couplings
Connect bus arbitration processor, uplink optical fiber mouthful circuit and two-way optical fiber subtending port connection light modular converter, multiple RS-485
Driving chip connects multiple high speed photo couplings and multichannel three-level lightning protection circuit.
It is transmitted the control signal at RS-485 bus marcos end by the conversion between optical signal and bus logic signal
To subscriber terminal equipment, subscriber terminal equipment is controlled；And, the data transfer that subscriber terminal equipment is fed back to RS-
485 bus marco ends.
RS-485 bus marcos end is sent after control signal, is converted into control signal by passive RS-485 optical network local sides
Optical signal, and many mouthfuls of terminals are transmitted through the fiber to, light is believed in the conversion between many mouthfuls of terminal optical signals and bus logic signal
Number it is converted into behind TTL logical signals " 0 " and " 1 ", RS-485 level signals is converted to through RS-485 driving chips, to user terminal
Equipment is controlled；Wherein to that should have optical output signal to be RS-485 bus logics " 0 " signal, correspondence is without optical output signal
RS-485 bus logics " 1 " signal.
Subscriber terminal equipment feedback data, by many mouthfuls of terminals by control signal be converted into TTL logical signals " 0 " and
After " 1 ", TTL logical signals are then converted into optical signal, wherein corresponding RS-485 bus logic " 0 " signal is to have light output letter
Number, correspondence RS-485 bus logic " 1 " signal is to be transmitted through the fiber to passive RS-485 without optical output signal, and by optical signal
Optical network local side, converts optical signals into RS-485 bus levels or RS-232 level signals, is then transmit to RS-485 total
Line traffic control end.
When subscriber terminal equipment is not received by the upload data command that local side apparatus is issued, many mouthfuls of terminals can only be in and detect
State is listened, any data will not be sent to bus, the data sending request of all many mouthfuls of terminals is all by RS-485 bus marcos end
Arbitration process.
Many mouthfuls of terminals are not when sending data, i.e. RS-485 bus frees, when being logical one (high level), optical interface list
The emitter of member can't send the laser of intensity；Many mouthfuls of terminals send logical zero (low level) when, UFIU UMSC Fiber Interface Unit
Launching opportunity sends the laser of some strength, to represent logical zero, many mouthfuls of terminals when sending logical one (high level),
The emitter of UFIU UMSC Fiber Interface Unit can't send the laser of intensity.
The photoelectric conversion module includes transmitter unit and receiving unit；Transmitter unit includes laser driver and laser
Device；Receiving unit includes photodiode and zoom comparison circuit.
By having light representations RS-485 bus logics " 0 " signal, no light representations RS-485 bus logics " 1 " signal；Bus
Equipment is not when sending signal, and the photoelectric conversion module Optical Transmit Unit of itself can not send the optical signal more than prescribed strength
Out, i.e., to possess transmitting arbitration functions when sending RS-485 bus logics " 1 ", prevent that bus is chaotic and causes nothing
The failure of method communication.
The two-way RS-485 subtending port circuits, to cascade the RS-485 subtending port circuits of extension for short distance,
Two-way optical fiber subtending port circuit, for the optical fiber subtending port circuit for cascading extension at a distance.
RS-485 buses are not when sending data, and bus is forced logical one (high level) state, when transmission logic
During " 1 " (high level) signal, RS485 bus levels keep logical one (high level) state without saltus step；And when transmission is patrolled
When volume " 0 " (low level), RS-485 buses are logical zero (low level) by logical one (high level) saltus step, when having sent logic
After " 0 " signal, bus logic state reverts to logical one (high level) again and maintained until next logical zero signal is arrived
Come.
Many mouthfuls of terminals are defeated after the processing of bus phase conversion circuit when RS-485 interface bus logic is level "0"
Go out logical one (high level) signal, now the laser driver driving laser hair of the Optical Transmit Unit of photoelectric conversion module
Go out the laser signal with some strength, the signal is to represent RS-485 bus logics " 0 "；Many mouthfuls of terminals are in RS-485 interfaces
When bus is logical one (high level), after phase conversion circuit is handled, logical zero (low level) signal is exported, photoelectricity turns
The laser driver driving cut-off of the Optical Transmit Unit of block is changed the mold, forces laser not send laser signal, the signal condition
Represent RS-485 bus logics " 1 "；The photoelectric conversion module of many mouthfuls of terminals when light receiving unit has light input, export logic
" 1 " (high level), after phase conversion circuit is handled, exports logical zero (low level) signal, makes control interface in RS-485 total
Line exports logical zero, during input that the light receiving unit of the photoelectric conversion module of many mouthfuls of terminals is unglazed, exports logical zero (low electricity
It is flat), after phase conversion circuit is handled, logical one (high level) signal is exported, control interface bus output in RS-485 is patrolled
Collect " 1 " (high level).
The effect of many mouthfuls of terminals is that the message for returning multiple subscriber terminal equipments is sent in computer room by many mouthfuls of terminals
Entreat control platform.Many mouthfuls of terminals are generally placed upon with multiple subscriber terminal equipment occasions.Whole system is controlled between computer room center
Platform (such as long-distance meter-reading system platform) between user terminal, realize it is remote, at a high speed, with the thorough quarantine center's computer room of optical fiber
Local side apparatus and user terminal electrical connection, 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 is to realize electric signal
It is converted into optical signal and converts optical signals into the key element of electric signal, 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 respectively by photodetector, amplifying circuit
With high-speed comparator composition.
The high speed photo coupling isolation circuit of RS-485 interface units is to isolate with the main function of DC-DC insulating power supply modules
Between RS-485 buses and photoelectric conversion module, the electrical connection of electric power system, can protect photoelectric conversion module and power supply be
System.The function of nonpolarity automatic transceiving commutating circuit is to realize the automatic switchover of RS-485 bus transceiving datas, is a kind of delay
Control is enabled, circuit parameter passes through careful design, it is possible to prevente effectively from false triggering, it is to avoid bus produces mistake.Three-level lightning protection net
Network its three-level high-performance anti-lightning is constituted by high-quality TVS Transient Suppression Diodes, ceramic gas discharge tube, resettable fuse
Circuit, can pass through IEC6100-4-54 grades of standards：1.2/50us 4KV 8/20us 2KA.
The operation principle of many mouthfuls of terminals of passive light splitting RS-485 fiber buss systems is as follows：Many mouthfuls of terminals are in RS-485 interfaces
When unit bus logic is level "0", after the processing of bus arbitration processor, logical one (high level) signal is exported, now
The laser driver driving laser of the Optical Transmit Unit of uplink optical fibers interface photoelectric conversion module, sends with some strength
Laser signal, the signal is to represent RS-485 bus logics " 0 "；Many mouthfuls of terminals are in RS-485 interface unit bus logics
When " 1 " (high level), after the processing of bus arbitration processor, logical zero (low level) signal, uplink optical fibers interface light are exported
The laser driver driving cut-off of the Optical Transmit Unit of electric modular converter, forces laser not send laser signal, the signal
Status representative RS-485 bus logics " 1 "；Uplink optical fibers interface photoelectric conversion module when light receiving unit has light input, it is defeated
Go out logical one (high level), after the processing of bus arbitration processor, export logical zero (low level) signal, meet RS-485
Mouthful unit bus output logical zero, during input that the light receiving unit of the photoelectric conversion module of many mouthfuls of terminals is unglazed, exports logic
" 0 " (low level), after the processing of bus arbitration processor, exports logical one (high level) signal, makes RS-485 interface units
Bus exports logical one.
The RS-485 interface units of passive many mouthfuls of terminals of light splitting RS-485 fiber buss systems have automatic reverse function, can
Transmission-receiving function is automatically switched with the state according to data/address bus, it controls circuit to control by the delay of a sophisticated design is enabled
The working condition of RS-485 bus drivers processed.The RS-485 buses of many mouthfuls of terminals can be always in when data are not sent
State is intercepted, and RS-485 driving chips can keep exporting a high level, until the arrival of logical zero (low level),
State can just be changed, the photoelectric conversion module of uplink optical fibers interface is when light receiving unit has light input, and output logical one is (high
Level), after the processing of bus arbitration processor, logical zero (low level) signal is exported, this signal is sent to simultaneously to be moved certainly
To circuit, commutating circuit can export logical one (high level) to the transmission Enable Pin of RS-485 bus drivers and receive enable
End (sends and enables high level effectively, it is effective that reception enables low level), allows driver effectively, logic is transmitted to RS-485 buses
" 0 " (low level) signal；The photoelectric conversion module of uplink optical fibers interface in the unglazed input of light receiving unit, export logic
" 0 " (low level), after the processing of bus arbitration processor, exports logical one (high level) signal, this signal is sent to simultaneously
Automatic reversing circuit, commutating circuit can export the transmission Enable Pin that a logical zero (low level) arrives RS-485 bus drivers
With receive Enable Pin (send and enable high level effectively, receive enable low level effective), allow driver without effective, receiving enable is
Low level, RS-485 buses are in reception state, and the state of RS-485 buses determines that state (is one by the upper pull down resistor of bus
Individual high level logic one state), it is equal to RS-485 buses and transmits level"1" logical signal.
Many mouthfuls of terminals of passive light splitting RS-485 fiber buss systems two RS-485 cascade expansion interface between, two light
Fibre cascade expansion interface between, and RS-485 cascade expansion interface between optical fiber cascade expansion interface between be no data
Exchange, be a kind of Bus isolation state, they only have exchanging for data between meeting and uplink optical fibers interface.
RS-485 cascade the communication mode of expansion interface and uplink optical fibers interface with RS-485 interface units and with up light
The communication mode of fine interface.
Any one optical fiber cascade expansion interface photoelectric conversion module when light receiving unit has light input, output is patrolled
Collect " 1 " (high level), this RS-485 bus for representing the subscriber terminal equipment of bottom transfers a logical zero signal and come,
It is the input for being transparent to uplink optical fibers interface Optical Transmit Unit for this signal bus arbitration processor, now uplink optical fibers
The laser driver driving laser of the Optical Transmit Unit of interface photoelectric conversion module sends the laser letter with some strength
Number, the signal is to represent the RS-485 bus logics " 0 " that subscriber terminal equipment transmission comes；When optical fiber cascades the light of expansion interface
Electric modular converter when light receiving unit does not have light input, export logical zero low level, this user terminal for representing bottom sets
Standby RS-485 buses transfer a logical one signal and come, and are to be transparent to for this signal bus arbitration processor
The laser of the input, the now Optical Transmit Unit of uplink optical fibers interface photoelectric conversion module of row optical fiber interface Optical Transmit Unit
Driver does not drive laser to send laser signal, and the state is patrolled for representing the RS-485 buses that subscriber terminal equipment transmission comes
Collect " 1 ".
But the preferable possible embodiments of the present invention are the foregoing is only, and are not used to the scope of the claims of the limitation present invention, therefore
Equivalent step and structure change that all utilization present specifications are made, are all contained in protection scope of the present invention.
Claims (7)
1. a kind of many mouthfuls of terminals of passive light splitting RS-485 fiber buss, it is characterised in that its two ends difference connected with passive light splitting RS-
The passive RS-485 optical network local sides and subscriber terminal equipment of 485 fiber buss, it includes power module, bus arbitration processing
Device, multiple photoelectric conversion modules, multiple high speed photo couplings, multichannel RS-485 interface units, two-way RS-485 subtending port circuits, two
Road optical fiber subtending port circuit, multiple RS-485 driving chips, multichannel three-level lightning protection circuit and all the way uplink optical fiber mouthful circuit, its
In, the multiple photoelectric conversion module, all the way RS-485 subtending ports circuit and the connection bus arbitration processing of multiple high speed photo couplings
Device, uplink optical fiber mouthful circuit and two-way optical fiber subtending port connection photoelectric conversion module, multiple RS-485 driving chips connections are more
Individual high speed photo coupling and multichannel three-level lightning protection circuit；By the control to multiple subscriber terminal apparatus information transmission channels, by RS-
The control signal at 485 bus marco ends is transmitted to subscriber terminal equipment, and subscriber terminal equipment is controlled；And, by user
The data transfer of terminal device feedback realizes passive light splitting RS-485 fiber buss point-to-multipoints to RS-485 bus marcos end
Two-way communication.
2. many mouthfuls of terminals of passive light splitting RS-485 fiber buss according to claim 1, it is characterised in that RS-485 buses
Control end is sent after control signal, control signal is converted into optical signal by passive RS-485 optical network local sides, and pass through optical fiber
At most mouth terminal, the conversion between many mouthfuls of terminal optical signals and bus logic signal is transmitted, TTL logics letter is converted optical signals into
After number " 0 " and " 1 ", RS-485 level signals are converted to through RS-485 driving chips, subscriber terminal equipment is controlled；Wherein
To that should have optical output signal to be RS-485 bus logics " 0 " signal, correspondence is believed without optical output signal for RS-485 bus logics " 1 "
Number.
3. many mouthfuls of terminals of passive light splitting RS-485 fiber buss according to claim 1, it is characterised in that user terminal is set
Control signal, is converted into after TTL logical signals " 0 " and " 1 ", then by TTL logics by the data of standby feedback by many mouthfuls of terminals
Signal is converted into optical signal, wherein corresponding RS-485 bus logic " 0 " signal is has optical output signal, correspondence RS-485 buses are patrolled
" 1 " signal is collected to be transmitted through the fiber to passive RS-485 optical network local sides without optical output signal, and by optical signal, light is believed
Number RS-485 bus levels or RS-232 level signals are converted into, are then transmit to RS-485 bus marcos end.
4. many mouthfuls of terminals of passive light splitting RS-485 fiber buss according to claim 1, it is characterised in that user terminal is set
Standby when being not received by the upload data command that local side apparatus is issued, many mouthfuls of terminals only can be in state be intercepted, will not be to bus
Any data are sent, the data sending request of all many mouthfuls of terminals is all by RS-485 main central control platform arbitration process.
5. many mouthfuls of terminals of passive light splitting RS-485 fiber buss according to claim 1, it is characterised in that many mouthfuls of terminals exist
When not sending data, i.e. RS-485 bus frees, when being logical one, the emitter of UFIU UMSC Fiber Interface Unit can't send intensity
Laser；Many mouthfuls of terminals are when sending logical zero, and the launching opportunity of UFIU UMSC Fiber Interface Unit sends the laser of some strength, is used to
Logical zero is represented, many mouthfuls of terminals are when sending logical one, and the emitter of UFIU UMSC Fiber Interface Unit can't send the laser of intensity.
6. many mouthfuls of terminals of passive light splitting RS-485 fiber buss according to claim 1, it is characterised in that the photoelectricity turns
Changing the mold block includes transmitter unit and receiving unit；Transmitter unit includes laser driver and laser；Receiving unit includes photoelectricity
Diode and zoom comparison circuit.
7. many mouthfuls of terminals of passive light splitting RS-485 fiber buss according to claim 1, it is characterised in that by there is light table
Show RS-485 bus logics " 0 " signal, no light representations RS-485 bus logics " 1 " signal；Bus apparatus when not sending signal,
The optical signal that the photoelectric conversion module Optical Transmit Unit of itself can not send more than prescribed strength comes out, that is, is sending RS-485
During bus logic " 1 ", to possess transmitting arbitration functions, prevent that bus is chaotic and leads to not the failure of communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410837393.1A CN104753596B (en) | 2014-12-29 | 2014-12-29 | A kind of passive many mouthfuls of terminals of the fiber buss of light splitting RS 485 |
Applications Claiming Priority (1)
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| TWI705335B (en) * | 2018-10-15 | 2020-09-21 | 新唐科技股份有限公司 | Integrated circuit, bus system and detecting method thereof |
| CN112949247B (en) * | 2021-02-01 | 2022-05-20 | 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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