CN104734780B - A kind of fiber buss CMTSs of passive light splitting RS 485 - Google Patents
A kind of fiber buss CMTSs of passive light splitting RS 485 Download PDFInfo
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Abstract
The invention discloses a kind of passive fiber buss CMTSs of light splitting RS 485, it is characterised in that the bus marco ends of RS 485 of the industrial optical fiber bus of its two ends difference connected with passive light splitting and the ONT Optical Network Terminals of passive RS 485；It includes the power module being connected with each other, master control borad, multiple planar waveguide-type optical branching devices and multiple optical ports, wherein, the master control borad includes controlling interface in RS 232, interface is controlled in RS 485, the subtending ports of two-way RS 485, multiple photoelectric conversion module and bus arbitration processors, the interfaces of RS 232 and two-way RS 485 subtending port the connection bus arbitration processor and the bus marco ends of RS 485, the multiple photoelectric conversion module one end connects bus arbitration processor, other end connection planar waveguide-type optical branching device one end, the planar waveguide-type optical branching device other end connects optical port.
Description
Technical field
The present invention relates to industry manufacture field, and in particular to a kind of passive light splitting RS-485 fiber buss CMTSs.
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 passive light splitting RS-485 fiber buss CMTSs of communication reliability.
The technical scheme that is used to achieve the above object of the present invention for：
A kind of passive light splitting RS-485 fiber buss CMTSs, the industrial optical fiber of its two ends difference connected with passive light splitting is total
The RS-485 bus marcos end of line and passive RS-485 ONT Optical Network Terminals；It includes the power module being connected with each other, and master control borad is more
Individual planar waveguide-type optical branching device and multiple optical ports, wherein, the master control borad includes controlling control in interface, RS-485 in RS-232 and connect
Interface and two is controlled in mouth, two-way RS-485 subtending ports, multiple photoelectric conversion module and bus arbitration processors, the RS-232
Road RS-485 subtending ports connection bus arbitration processor and RS-485 bus marcos end, the multiple photoelectric conversion module one end
Connect bus arbitration processor, other end connection planar waveguide-type optical branching device one end, the planar waveguide-type optical branching device other end
Connect optical port.
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
After TTL logical signals " 0 " and " 1 ", TTL logical signals are then converted into optical signal, wherein corresponding RS-485 bus logics " 0 "
Signal is has optical output signal, and correspondence RS-485 bus logic " 1 " signal is to pass through optical fiber without optical output signal, and by optical signal
Transmit to passive RS-485 ONT Optical Network Terminals, convert optical signals into RS-485 bus logic level signals, realization is set to terminal
Standby control.
The data of subscriber terminal equipment feedback, convert the data into TTL logics by passive RS-485 ONT Optical Network Terminals and believe
Number, optical signal is then converted into according to TTL logical signals, passive RS-485 optical network local sides is transmitted through the fiber to, 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.
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, and transmitter unit receives what bus arbitration processor was treated
Drive laser to light during RS-485 bus logics level " 0 ", send the optical signal of logical zero, receiving at bus arbitration
When managing the RS-485 bus logics level " 1 " that device is treated, drive circuit does not drive laser to light, and produces the light of logical one
Signal, receiving unit is receiving the logical zero optical signal that passive RS-485 ONT Optical Network Terminals are sent, and this optical signal is changed
Into the manageable logical one TTL high level signals of bus arbitration processor, this signal is converted into and patrolled by bus arbitration processor
" 0 " TTL low level signals are collected, is sent to after RS-485 bus driver chips and is sent to RS-485 bus marcos end, in no light letter
Number input when, this optical signal is converted into the manageable logical zero TTL low level signals of bus arbitration processor, bus is secondary
Cut out processor and this signal is converted into logical one TTL high level signals, RS- is sent to after being sent to RS-485 bus driver chips
485 bus marco ends.
The bus arbitration processor includes process chip, and the reset circuit being connected with the process chip, clock
Circuit, process chip power filter and decoupling circuit, DLL circuit, toggle switch circuit and Interface Expanding circuit.
Interface is controlled in the RS-232 includes bus driving circuits A, and the DC- being connected with bus driving circuits A
D/C power circuit, two photoelectric coupled circuits, interface card and lightning protection circuit.
Interface and RS-485 subtending ports are controlled in the RS-485 includes bus driving circuits B, and with the bus driver
The DC-DC power source circuit that circuit B is connected, two photoelectric coupled circuits, negative circuit, lightning protection circuit and interface card.
Planar waveguide-type optical branching device is responsible for the light that photoelectric conversion module transmitter unit is sent in system master making sheet is equal
It is even to be assigned to above each Fiber Node port and system master making sheet photoelectricity will be sent to after the optical signal convergence of each node
The receiving terminal of modular converter；System master making sheet is by controlling interface and controlling interface, two-way RS- in RS-485 all the way in RS-232 all the way
485 subtending ports, N number of photoelectric conversion module, bus arbitration processor group into.Controlled in RS-232 in interface and RS-485 and control interface
It is mainly used to realize the communication connection with RS-485 bus marcos platform (such as long-distance meter-reading system platform), can be according to actual need
Want optional one；Two RS-485 cascade port, can make local side apparatus extension two similar local side apparatus of connection, such as
Fruit is used to connect up local side apparatus as middle cascade device, then a RS-485 cascades port, and one is used to connect descending
Local side apparatus.Multiple local side apparatus cascade port using RS-485 can realize that the high power capacity of port number extends.
The Transistor-Transistor Logic level control signal that the photoelectric conversion module of master control borad is responsible for sending out bus arbitration processor is converted into light
Form be sent to planar waveguide-type optical branching device, and the optical signal sent back through planar waveguide-type optical branching device is reduced into bus
The manageable Transistor-Transistor Logic level signal of arbitration processor；Photoelectric conversion module is made up of transmitter unit and receiving unit.Transmitter unit
By laser driver and laser constitution；Receiving unit is made up of photodiode and zoom comparison circuit.Optical-electrical converter
When the input port of transmitter unit is level " 1 ", drive circuit driving laser lights, and the input port of transmitter unit is level
When " 0 ", laser cut-off does not light；Receiving unit exports high level " 1 ", unglazed input when reception has optical signal input
When, export low level " 0 ".
When controlling interface bus logic in RS-485 for level "0", after the processing of bus arbitration processor logical transition,
Logical one high level signal is exported, 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 "；Local side apparatus is controlled in RS-485
When interface bus logic is level"1", after the processing of bus arbitration processor logical transition, output logical zero low level letter
Number, the laser driver driving cut-off of the Optical Transmit Unit of photoelectric conversion module forces laser not send laser signal, should
Signal condition represents RS-485 bus logics " 1 "；The photoelectric conversion module of local side apparatus when light receiving unit has light input,
High level " 1 " is exported, after the processing of bus arbitration processor logical transition, logical zero low level signal is exported, makes RS-485
Middle control interface bus output logical zero, during input that the light receiving unit of the photoelectric conversion module of local side apparatus is unglazed, exports low electricity
Flat " 0 ", after the processing of bus arbitration processor logical transition, exports logic high " 1 " signal, makes to control interface in RS-485
Bus exports logical one.
Planar waveguide-type optical branching device (PLC Splitter) is a kind of integrated waveguide light based on quartz base plate to design
Power-splitting device, with small volume, operating wavelength range is wide, and reliability is high, the features such as light splitting uniformity is good.
RS-485 cascades port has automatic reverse function, can automatically switch transmitting-receiving work(according to the state of data/address bus
Can, it controls circuit to control the working condition of RS-485 bus drivers by the delay of a sophisticated design is enabled.Local side is set
For when RS-485 cascade port bus logics are level "0", directly it is transparent in RS-485 and is controlled by bus arbitration processor
Interface bus, when to allow it to be also logic be level "0", local side apparatus when RS-485 cascade port bus logics are level"1",
Directly it is transparent to by bus arbitration processor in RS-485 and controls interface bus, when to allow it to be also logic be level"1", Yong Huke
To realize the user terminal networking of Large Copacity using the cascade multiple local side apparatus of ports-Extending.
Bus arbitration processor is made up of high density, high speed CPLD or FPGA, by complicated digital logical operation, is completed
The communication logic control of each RS-485 fiber port, is the core of whole system, and bus arbitration processor is by RS-485 buses
The control command that control end is sent is broadcast to all Fiber Node ports, allows all terminal nodes to receive RS-485 total
The control instruction of line traffic control platform, when subscriber terminal equipment, which is received, to one's name sends instruction, it would be desirable to the data warp of submission
Cross passive light splitting RS-485 fiber buss terminals and be converted into optical signal, passive light splitting RS-485 optical fiber is sent to by optical fiber link
The bus arbitration processor of bus local side, it is after bus arbitration processor is handled according to the communication mechanism of agreement, data are correct
RS-485 bus marcos end is sent to, so as to realize the remote collection of data.
The beneficial effects of the invention are as follows：The network CMTS of the present invention, is the constructing communication network of point-to-multipoint, slab guide
It can be integrated among local side apparatus type optical branching device, can also be independently of local side apparatus outside, it is direct using PLC spectroscopic modes
Passive transmission RS-485 signals, need not move through protocol conversion, it is not necessary to change original network architecture, compared to using TCP/IP nets
Network transmission means, whole system very simple.Using the master of point-to-multipoint -- from structure, a passive RS-485 optical network local side
Maximum can 128 nodes of carry, can be with carry by the RS-485 expansion interfaces cascade of n passive RS-485 optical network local sides
128*n network node, greatly improves the message capacity of system.Conventional point-to-point optical fiber connected mode needs two and set
Standby docking, and now using point-to-multipoint master -- from optical fiber solutions, multiple subscriber terminal equipments share a local side apparatus, network
It is simple in construction, and whole 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 present system overall structure diagram；
Fig. 2 is bus arbitration processor cpu circuit figure；
Fig. 3 is bus arbitration processor reset circuit diagram；
Fig. 4 is bus arbitration processor clock circuit diagram；
Fig. 5 is bus arbitration processor process chip power filter and decoupling circuit figure；
Fig. 6 is bus arbitration processor DLL circuit diagram；
Fig. 7 is bus arbitration processor toggle switch circuit diagram；
Fig. 8 is bus arbitration processor interface expanded circuit figure；
Fig. 9 be RS-232 in control interface circuit figure；
Figure 10 is RS-485 subtending port circuit diagrams A；
Figure 11 is power module circuitry figure；
Figure 12 is light modular converter and planar waveguide-type optical branching device circuit diagram 1；
Figure 13 be RS-485 in control interface circuit figure；
Figure 14 is RS-485 subtending port circuit diagrams B
Figure 15 is light modular converter and planar waveguide-type optical branching device circuit diagram 2；
Figure 16 is light modular converter and planar waveguide-type optical branching device circuit diagram 3；
Figure 17 is light modular converter and planar waveguide-type optical branching device circuit diagram 4；
Figure 18 is light modular converter and planar waveguide-type optical branching device circuit diagram 5；
Figure 19 is light modular converter and planar waveguide-type optical branching device circuit diagram 6；
Figure 20 is light modular converter and planar waveguide-type optical branching device circuit diagram 7；
Figure 21 is light modular converter and planar waveguide-type optical branching device circuit diagram 8.
Embodiment
Embodiment：Referring to Fig. 1~Figure 21, the present embodiment provides a kind of passive light splitting RS-485 fiber buss CMTSs,
The RS-485 bus marcos end of the industrial optical fiber bus of its two ends difference connected with passive light splitting and passive RS-485 ONT Optical Network Terminals；
It includes the power module being connected with each other, master control borad, multiple planar waveguide-type optical branching devices and multiple optical ports, wherein, the master
Control plate includes controlling in RS-232 and controlling interface in interface, RS-485, two-way RS-485 subtending ports, multiple photoelectric conversion modules and total
Interface and two-way RS-485 subtending ports connection bus arbitration processor and RS-485 are controlled in line arbitration processor, the RS-232
Bus marco end, the multiple photoelectric conversion module one end connects bus arbitration processor, other end connection planar waveguide-type light
Shunt one end, planar waveguide-type optical branching device other end connection optical port.
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
After TTL logical signals " 0 " and " 1 ", TTL logical signals are then converted into optical signal, wherein corresponding RS-485 bus logics " 0 "
Signal is has optical output signal, and correspondence RS-485 bus logic " 1 " signal is to pass through optical fiber without optical output signal, and by optical signal
Transmit to passive RS-485 ONT Optical Network Terminals, convert optical signals into RS-485 bus logic level signals, realization is set to terminal
Standby control.
The data of subscriber terminal equipment feedback, convert the data into TTL logics by passive RS-485 ONT Optical Network Terminals and believe
Number, optical signal is then converted into according to TTL logical signals, passive RS-485 optical network local sides is transmitted through the fiber to, 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.
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, and transmitter unit receives what bus arbitration processor was treated
Drive laser to light during RS-485 bus logics level " 0 ", send the optical signal of logical zero, receiving at bus arbitration
When managing the RS-485 bus logics level " 1 " that device is treated, drive circuit does not drive laser to light, and produces the light of logical one
Signal, receiving unit is receiving the logical zero optical signal that passive RS-485 ONT Optical Network Terminals are sent, and this optical signal is changed
Into the manageable logical one TTL high level signals of bus arbitration processor, this signal is converted into and patrolled by bus arbitration processor
" 0 " TTL low level signals are collected, is sent to after RS-485 bus driver chips and is sent to RS-485 bus marcos end, in no light letter
Number input when, this optical signal is converted into the manageable logical zero TTL low level signals of bus arbitration processor, bus is secondary
Cut out processor and this signal is converted into logical one TTL high level signals, RS- is sent to after being sent to RS-485 bus driver chips
485 bus marco ends.
The bus arbitration processor includes process chip, and the reset circuit being connected with the process chip, clock
Circuit, process chip power filter and decoupling circuit, DLL circuit, toggle switch circuit and Interface Expanding circuit.
Interface is controlled in the RS-232 includes bus driving circuits A, and the DC- being connected with bus driving circuits A
D/C power circuit, two photoelectric coupled circuits, interface card and lightning protection circuit.
Interface, RS-485 subtending ports are controlled in the RS-485 includes bus driving circuits B, and electric with the bus driver
The DC-DC power source circuit that road B is connected, two photoelectric coupled circuits, negative circuit, lightning protection circuit and interface card.
Planar waveguide-type optical branching device is responsible for the light that photoelectric conversion module transmitter unit is sent in system master making sheet is equal
It is even to be assigned to above each Fiber Node port and system master making sheet photoelectricity will be sent to after the optical signal convergence of each node
The receiving terminal of modular converter；System master making sheet is by controlling interface and controlling interface, two-way RS- in RS-485 all the way in RS-232 all the way
485 subtending ports, N number of photoelectric conversion module, bus arbitration processor group into.Controlled in RS-232 in interface and RS-485 and control interface
It is mainly used to realize the communication connection with RS-485 bus marcos end (such as long-distance meter-reading system platform), can be according to actual needs
Optional one；Two RS-485 cascade port, can make local side apparatus extension two similar local side apparatus of connection, if
As middle cascade device, then a RS-485 cascade port is for connecting up local side apparatus, and one is used to connect descending office
End equipment.Multiple local side apparatus cascade port using RS-485 can realize that the high power capacity of port number extends.
The Transistor-Transistor Logic level control signal that the photoelectric conversion module of master control borad is responsible for sending out bus arbitration processor is converted into light
Form be sent to planar waveguide-type optical branching device, and the optical signal sent back through planar waveguide-type optical branching device is reduced into bus
The manageable Transistor-Transistor Logic level signal of arbitration processor；Photoelectric conversion module is made up of transmitter unit and receiving unit.Transmitter unit
By laser driver and laser constitution；Receiving unit is made up of photodiode and zoom comparison circuit.Optical-electrical converter
When the input port of transmitter unit is level " 1 ", drive circuit driving laser lights, and the input port of transmitter unit is level
When " 0 ", laser cut-off does not light；Receiving unit exports high level " 1 ", unglazed input when reception has optical signal input
When, export low level " 0 ".
When controlling interface bus logic in RS-485 for level "0", after the processing of bus arbitration processor logical transition,
Logical one high level signal is exported, 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 "；Local side apparatus is controlled in RS-485
When interface bus logic is level"1", after the processing of bus arbitration processor logical transition, output logical zero low level letter
Number, the laser driver driving cut-off of the Optical Transmit Unit of photoelectric conversion module forces laser not send laser signal, should
Signal condition represents RS-485 bus logics " 1 "；The photoelectric conversion module of local side apparatus when light receiving unit has light input,
High level " 1 " is exported, after the processing of bus arbitration processor logical transition, logical zero low level signal is exported, makes RS-485
Middle control interface bus output logical zero, during input that the light receiving unit of the photoelectric conversion module of local side apparatus is unglazed, exports low electricity
Flat " 0 ", after the processing of bus arbitration processor logical transition, exports logic high " 1 " signal, makes to control interface in RS-485
Bus exports logical one.
Planar waveguide-type optical branching device (PLC Splitter) is a kind of integrated waveguide light based on quartz base plate to design
Power-splitting device, with small volume, operating wavelength range is wide, and reliability is high, the features such as light splitting uniformity is good.
RS-485 cascades port has automatic reverse function, can automatically switch transmitting-receiving work(according to the state of data/address bus
Can, it controls circuit to control the working condition of RS-485 bus drivers by the delay of a sophisticated design is enabled.Local side is set
For when RS-485 cascade port bus logics are level "0", directly it is transparent in RS-485 and is controlled by bus arbitration processor
Interface bus, when to allow it to be also logic be level "0", local side apparatus when RS-485 cascade port bus logics are level"1",
Directly it is transparent to by bus arbitration processor in RS-485 and controls interface bus, when to allow it to be also logic be level"1", Yong Huke
To realize the client terminal networking of Large Copacity using the cascade multiple local side apparatus of ports-Extending.
Bus arbitration processor is made up of high density, high speed CPLD or FPGA, by complicated digital logical operation, is completed
The communication logic control of each RS-485 fiber port, is the core of whole system, and bus arbitration processor is by RS-485 buses
The control command that central control terminal is sent is broadcast to all Fiber Node ports, allows all terminal nodes to receive RS-
The control instruction of 485 bus marco platforms, when subscriber terminal equipment, which is received, to one's name sends instruction, it would be desirable to the number of submission
Optical signal is converted into according to by passive light splitting RS-485 fiber buss terminals, passive light splitting RS-485 is sent to by optical fiber link
The bus arbitration processor of fiber buss local side, after bus arbitration processor is handled according to the communication mechanism of agreement, by data just
True is sent to RS-485 bus marcos end, so as to realize the remote collection of data.
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 (5)
1. a kind of passive light splitting RS-485 fiber buss CMTSs, it is characterised in that the difference connected with passive light splitting of its two ends
The RS-485 bus marcos end of industrial optical fiber bus and passive RS-485 ONT Optical Network Terminals；It includes the power supply mould being connected with each other
Block, master control borad, multiple planar waveguide-type optical branching devices and multiple optical ports, wherein, the master control borad includes controlling interface in RS-232,
Interface, two-way RS-485 subtending ports, multiple photoelectric conversion module and bus arbitration processors, the RS-232 are controlled in RS-485
Middle control interface and two-way RS-485 subtending ports connection bus arbitration processor and RS-485 bus marcos end, the multiple photoelectricity
Modular converter one end connects bus arbitration processor, other end connection planar waveguide-type optical branching device one end, planar waveguide-type light
The shunt other end connects optical port；Bus arbitration processor completes each RS-485 optical fiber by complicated digital logical operation
The communication logic control of port, the control signal at RS-485 bus marcos end is transmitted to subscriber terminal equipment, to user terminal
Equipment is controlled；And, the data transfer that subscriber terminal equipment is fed back realizes passive light splitting to RS-485 bus marcos end
The two-way communication of RS-485 fiber buss point-to-multipoints.
2. passive light splitting RS-485 fiber buss CMTSs according to claim 1, it is characterised in that RS-485 buses
Control end is sent after control signal, by passive RS-485 optical network local sides 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
ONT Optical Network Terminal, converts optical signals into RS-485 bus logic level signals, realizes the control to terminal device.
3. passive light splitting RS-485 fiber buss CMTSs according to claim 1, it is characterised in that user terminal is set
The data of standby feedback, convert the data into TTL logical signals, then according to TTL logics by passive RS-485 ONT Optical Network Terminals
Signal is converted into optical signal, is transmitted through the fiber to passive RS-485 optical network local sides, converts optical signals into RS-485 buses
Level or RS-232 level signals, are then transmit to RS-485 bus marcos end.
4. passive light splitting RS-485 fiber buss CMTSs 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, transmitter unit receive the treated RS-485 bus logic level of bus arbitration processor
Drive laser to light when " 0 ", send the optical signal of logical zero, receive the treated RS-485 of bus arbitration processor
During bus logic level " 1 ", drive circuit does not drive laser to light, and produces the optical signal of logical one, and receiving unit is being received
The logical zero optical signal sent to passive RS-485 ONT Optical Network Terminals, this optical signal is converted into bus arbitration processor can
With the logical one TTL high level signals of processing, this signal is converted into logical zero TTL low levels by bus arbitration processor to be believed
Number, it is sent to after RS-485 bus driver chips and is sent to RS-485 bus marcos end, when no optical signal is inputted, this light is believed
The manageable logical zero TTL low level signals of bus arbitration processor number are converted into, bus arbitration processor turns this signal
Logical one TTL high level signals are turned to, is sent to after RS-485 bus driver chips and is sent to RS-485 bus marcos end.
5. passive light splitting RS-485 fiber buss CMTSs according to claim 1, it is characterised in that the bus is secondary
Cutting out processor includes process chip, and the reset circuit being connected with the process chip, clock circuit, the filter of process chip power supply
Involve decoupling circuit, DLL circuit, toggle switch circuit and Interface Expanding circuit.
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Address after: Room 501, Building 1, No. 5, Zaosan Market Street, Dongcheng Street, Dongguan City, Guangdong Province, 523000 Patentee after: Guangdong Qiding Optoelectronics Technology Co.,Ltd. Address before: Room 10, 7th Floor, Commercial Building, Phase II, Goldman Sachs Technology Park, No. 5, Longxi Road, Zhouxi, Nancheng District, Dongguan City, Guangdong Province, 523000 Patentee before: SMART OPTICAL COMMUNICATION CO.,LTD. |