CN104734780A - Passive light-splitting RS-485 optical fiber bus local side system - Google Patents
Passive light-splitting RS-485 optical fiber bus local side system Download PDFInfo
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Abstract
The invention discloses a passive light-splitting RS-485 optical fiber bus local side system. The system is characterized in that the two ends of the system are connected with an RS-485 bus control terminal and a passive RS-485 optical network terminal of an industry optical fiber bus for passive light splitting respectively. The system comprises a power module, a main control panel, a plurality of plane waveguide optical dividers and a plurality of light ports which are connected. The main control panel comprises an RS-232 center control interface, an RS-485 center control interface, two RS-485 cascade interfaces, a plurality of photoelectric conversion modules and a bus arbitration processor. The RS-232 interface and the two RS-485 cascade interfaces are connected with the bus arbitration processor and the RS-485 bus control terminal. One ends of the multiple photovoltaic conversion modules are connected with the bus arbitration processor, and the other ends of the multiple photovoltaic conversion modules are connected with one ends of the plane waveguide optical dividers. The other ends of the plane waveguide optical dividers are connected with the light ports.
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 CMTS.
Background technology
Intelligent instrument grows up along with the maturation of singlechip technology at the beginning of the eighties, instrument market, the present world substantially monopolize by intelligent instrument.Tracing it to its cause is exactly the needs of IT application in enterprises, and enterprise's one of them necessary condition when instrument selection will have connected network communication interface exactly.Be that data analog signal exports simple procedure amount at first, instrumentation tap was RS-232 interface afterwards, and this interface can realize point-to-point communication mode, but this mode can not realize network savvy.The RS-485 occurred subsequently solves this problem.
RS-485 adopts differential signal negative logic, and-2V ~-6V represents " 0 ", and+2V ~+6V represents " 1 ".RS-485 has two-wire system and four-wire system two kinds of wiring, four-wire system can only realize point-to-point communication mode, now seldom adopt, now what adopt is the two-wire system mode of connection more, and to be that bus type topological structure is generally maximum on same bus can mount 32 nodes to this mode of connection.In RS-485 communication network, general employing is master-slave communication mode, and namely a main frame band is multiple from machine.With a pair twisted-pair feeder, " A ", " B " of each interface end is coupled together when connecting RS-485 communication link.
The bus type structure that traditional network topology generally adopts terminal to mate, does not support annular or star network.Networking medium mainly contains twisted-pair cable and optical fiber, and twisted-pair cable and optical fiber, when building network, have following problem:
(1) common mode disturbances: RS-485 interface adopts differential mode signal transmission mode, does not need to carry out detection signal relative to certain reference point, the potential difference that system only need detect between two lines is just passable.But people often ignore transceiver certain common-mode voltage range, RS-485 transceiver common-mode voltage range is-7 ~+12V, only has and meets above-mentioned condition, and whole network could normal work.The reliable and stable of communication will be affected when common-mode voltage in network line exceeds this scope, even damage interface.
(2) EMI: the co-moulded parts sent in driver output signal needs a return path, as the backward channel (signal ground) of neither one low-resistance, will return source in the form of radiation, whole bus will as a huge outside radiated electromagnetic wave of antenna.
(3) adopt a twisted-pair cable to make bus, each node is connected in series, should be as far as possible short to the length of lead-out wire of each node from bus, to make the impact of the reflected signal in lead-out wire on bus signals minimum.
(4) maximum communication distance adopting a twisted-pair cable to make bus is about 1219m, peak transfer rate is 10Mbps, transmission rate and transmission range are inversely proportional to, under the transmission rate of 100KbpS, just can reach maximum communication distance, if longer distance need be transmitted, need to add 485 repeaters.Along with the increase of transmission range, traffic rate can decline rapidly, can not ensure high-speed remote from communicating requirement.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, provide one at a distance, at a high speed, Large Copacity, employing RS-485 in conjunction with optical fiber communication, the passive light splitting RS-485 fiber buss CMTS 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 CMTS, the RS-485 bus marco end of the industrial optical fiber bus of its two ends difference connected with passive light splitting and passive RS-485 Optical Network Terminal, it comprises interconnective power module, master control borad, multiple planar waveguide-type optical branching device and multiple light mouth, wherein, described master control borad comprises control interface in RS-232, control interface in RS-485, two-way RS-485 subtending port, multiple photoelectric conversion module and bus arbitration processor, in described RS-232, control interface is connected bus arbitration processor and RS-485 bus marco end with two-way RS-485 subtending port, described multiple photoelectric conversion module one end connects bus arbitration processor, the other end connects planar waveguide-type optical branching device one end, the planar waveguide-type optical branching device other end connects light mouth.
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, after converting control signal to TTL logical signal " 0 " and " 1 " by passive RS-485 optical network local side, 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 Terminal, light signal is converted to RS-485 bus logic level signal, realize the control to terminal equipment.
The data of subscriber terminal equipment feedback, by passive RS-485 Optical Network Terminal, data transaction is become TTL logical signal, then light signal is converted to according to TTL logical signal, be 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.
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, when transmitter unit receives the RS-485 bus logic level " 0 " of bus arbitration processor process, drive laser is luminous, send the light signal of logical zero, when receiving the RS-485 bus logic level " 1 " of bus arbitration processor process, drive circuit not drive laser is luminous, produce the light signal of logical one, the logical zero light signal that receiving element is receiving passive RS-485 Optical Network Terminal and sends, this light signal is converted to bus arbitration processor manageable logical one TTL high level signal, this signal is converted into logical zero TTL low level signal by bus arbitration processor, RS-485 bus marco end is sent to after delivering to RS-485 bus driver chip, when not having light signal to input, this light signal is converted to bus arbitration processor manageable logical zero TTL low level signal, this signal is converted into logical one TTL high level signal by bus arbitration processor, RS-485 bus marco end is sent to after delivering to RS-485 bus driver chip.
Described bus arbitration processor comprises process chip, and the reset circuit be connected with this process chip, clock circuit, process chip power filter and decoupling circuit, DLL (dynamic link library) circuit, toggle switch circuit and Interface Expanding circuit.
In described RS-232, control interface comprises bus driving circuits A, and the DC-DC power source circuit be connected with this bus driving circuits A, two photoelectric coupled circuit, interface card and lightning protection circuits.
In described RS-485, control interface and RS-485 subtending port comprise bus driving circuits B, and the DC-DC power source circuit be connected with this bus driving circuits B, two photoelectric coupled circuit, negative circuit, lightning protection circuit and interface cards.
The light that planar waveguide-type optical branching device is responsible for photoelectric conversion module transmitter unit in system master making sheet to send is assigned to above each Fiber Node port uniformly and delivers to the receiving terminal of system master making sheet photoelectric conversion module after being converged by the light signal of each node; System master making sheet is made up of control interface, two-way RS-485 subtending port, N number of photoelectric conversion module, bus arbitration processor in control interface in a road RS-232 and a road RS-485.In RS-232, in control interface and RS-485, control interface is mainly used to realize the communication connection with RS-485 bus marco platform (as long-distance meter-reading system platform), can optional one according to actual needs; Two RS-485 cascade ports, can make the local side apparatus that a local side apparatus expansion connection two is similar, if as middle cascade device, then a RS-485 cascade port is for connecting up local side apparatus, and one for connecting descending local side apparatus.Multiple local side apparatus uses RS-485 cascade port can realize the high power capacity expansion of port number.
The form that the Transistor-Transistor Logic level control signal that the photoelectric conversion module of master control borad is responsible for bus arbitration processor to send converts light to delivers to planar waveguide-type optical branching device, and the light signal sent back through planar waveguide-type optical branching device is reduced into the manageable Transistor-Transistor Logic level signal of bus arbitration processor; Photoelectric conversion module is made up of transmitter unit and receiving element.Transmitter unit is by laser driver and laser constitution; Receiving element is made up of photodiode and amplification comparison circuit.When the input port of the transmitter unit of optical-electrical converter is level " 1 ", drive circuit drive laser is luminous, and when the input port of transmitter unit is level " 0 ", laser ends, not luminous; Receiving element, when reception has light signal to input, exports high level " 1 ", during unglazed input, and output low level " 0 ".
When in RS-485, control interface bus logic is level "0", after bus arbitration processor logic conversion process, 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 "; Local side apparatus is when in RS-485, control interface bus logic is level"1", after bus arbitration processor logic conversion 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 local side apparatus when light receiving unit has light to input, export high level " 1 ", after bus arbitration processor logic conversion 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 local side apparatus is unglazed, output low level " 0 ", after bus arbitration processor logic conversion process, output logic high level " 1 " signal, makes control interface bus output logic " 1 " in RS-485.
The features such as it is a kind of integrated waveguide optical power distribution devices based on quartz base plate that planar waveguide-type optical branching device (PLC Splitter) designs, and have volume little, operating wavelength range is wide, and reliability is high, and point optical uniformity is good.
RS-485 cascade port has automatic reverse function, can switch transmission-receiving function automatically according to the state of data/address bus, and it is by the operating state of the time delay of a sophisticated design enable control circuit control RS-485 bus driver.Local side apparatus is when RS-485 cascade port bus logic is level "0", directly be transparent to control interface bus in RS-485 by bus arbitration processor, allow it also for logic be level "0" time, local side apparatus is when RS-485 cascade port bus logic is level"1", directly be transparent to control interface bus in RS-485 by bus arbitration processor, allow it also for logic be level"1" time, user can use the multiple local side apparatus of cascade ports-Extending to realize jumbo user terminal networking.
Bus arbitration processor is by high density, high speed CPLD or FPGA composition, by the digital logical operation of complexity, the communication logic completing each RS-485 fiber port controls, it is the core of whole system, the control command that RS-485 bus marco end sends is broadcast to all Fiber Node ports by bus arbitration processor, allow all terminal nodes can receive the control command of RS-485 bus marco platform, when subscriber terminal equipment receives to one's name transmission instruction, light signal is converted to through passive light splitting RS-485 fiber buss terminal by needing the data submitted to, the bus arbitration processor of passive light splitting RS-485 fiber buss local side is sent to by optical fiber link, after the communication mechanism process of bus arbitration processor according to agreement, correct for data is sent to RS-485 bus marco end, thus realize the remote collection of data.
The invention has the beneficial effects as follows: linked office of the present invention end system, for the constructing communication network of point-to-multipoint, its accessible site of planar waveguide-type optical branching device is among local side apparatus, also can independent of outside local side apparatus, adopt PLC 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 adopt the master of point-to-multipoint--from optical fiber solutions, multiple subscriber terminal equipment shares a local side apparatus, and network configuration is simple, 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 present system overall structure schematic 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 (dynamic link library) circuit diagram;
Fig. 7 is bus arbitration processor toggle switch circuit diagram;
Fig. 8 is bus arbitration processor interface expanded circuit figure;
Fig. 9 is control interface circuit diagram in RS-232;
Figure 10 is RS-485 subtending port circuit diagram 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 is control interface circuit diagram in RS-485;
Figure 14 is RS-485 subtending port circuit diagram 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: see Fig. 1 ~ Figure 21, the present embodiment provides a kind of passive light splitting RS-485 fiber buss CMTS, the RS-485 bus marco end of the industrial optical fiber bus of its two ends difference connected with passive light splitting and passive RS-485 Optical Network Terminal, it comprises interconnective power module, master control borad, multiple planar waveguide-type optical branching device and multiple light mouth, wherein, described master control borad comprises control interface in RS-232, control interface in RS-485, two-way RS-485 subtending port, multiple photoelectric conversion module and bus arbitration processor, in described RS-232, control interface is connected bus arbitration processor and RS-485 bus marco end with two-way RS-485 subtending port, described multiple photoelectric conversion module one end connects bus arbitration processor, the other end connects planar waveguide-type optical branching device one end, the planar waveguide-type optical branching device other end connects light mouth.
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, after converting control signal to TTL logical signal " 0 " and " 1 " by passive RS-485 optical network local side, 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 Terminal, light signal is converted to RS-485 bus logic level signal, realize the control to terminal equipment.
The data of subscriber terminal equipment feedback, by passive RS-485 Optical Network Terminal, data transaction is become TTL logical signal, then light signal is converted to according to TTL logical signal, be 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.
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, when transmitter unit receives the RS-485 bus logic level " 0 " of bus arbitration processor process, drive laser is luminous, send the light signal of logical zero, when receiving the RS-485 bus logic level " 1 " of bus arbitration processor process, drive circuit not drive laser is luminous, produce the light signal of logical one, the logical zero light signal that receiving element is receiving passive RS-485 Optical Network Terminal and sends, this light signal is converted to bus arbitration processor manageable logical one TTL high level signal, this signal is converted into logical zero TTL low level signal by bus arbitration processor, RS-485 bus marco end is sent to after delivering to RS-485 bus driver chip, when not having light signal to input, this light signal is converted to bus arbitration processor manageable logical zero TTL low level signal, this signal is converted into logical one TTL high level signal by bus arbitration processor, RS-485 bus marco end is sent to after delivering to RS-485 bus driver chip.
Described bus arbitration processor comprises process chip, and the reset circuit be connected with this process chip, clock circuit, process chip power filter and decoupling circuit, DLL (dynamic link library) circuit, toggle switch circuit and Interface Expanding circuit.
In described RS-232, control interface comprises bus driving circuits A, and the DC-DC power source circuit be connected with this bus driving circuits A, two photoelectric coupled circuit, interface card and lightning protection circuits.
In described RS-485, control interface, RS-485 subtending port comprise bus driving circuits B, and the DC-DC power source circuit be connected with this bus driving circuits B, two photoelectric coupled circuit, negative circuit, lightning protection circuit and interface cards.
The light that planar waveguide-type optical branching device is responsible for photoelectric conversion module transmitter unit in system master making sheet to send is assigned to above each Fiber Node port uniformly and delivers to the receiving terminal of system master making sheet photoelectric conversion module after being converged by the light signal of each node; System master making sheet is made up of control interface, two-way RS-485 subtending port, N number of photoelectric conversion module, bus arbitration processor in control interface in a road RS-232 and a road RS-485.In RS-232, in control interface and RS-485, control interface is mainly used to realize the communication connection with RS-485 bus marco end (as long-distance meter-reading system platform), can optional one according to actual needs; Two RS-485 cascade ports, can make the local side apparatus that a local side apparatus expansion connection two is similar, if as middle cascade device, then a RS-485 cascade port is for connecting up local side apparatus, and one for connecting descending local side apparatus.Multiple local side apparatus uses RS-485 cascade port can realize the high power capacity expansion of port number.
The form that the Transistor-Transistor Logic level control signal that the photoelectric conversion module of master control borad is responsible for bus arbitration processor to send converts light to delivers to planar waveguide-type optical branching device, and the light signal sent back through planar waveguide-type optical branching device is reduced into the manageable Transistor-Transistor Logic level signal of bus arbitration processor; Photoelectric conversion module is made up of transmitter unit and receiving element.Transmitter unit is by laser driver and laser constitution; Receiving element is made up of photodiode and amplification comparison circuit.When the input port of the transmitter unit of optical-electrical converter is level " 1 ", drive circuit drive laser is luminous, and when the input port of transmitter unit is level " 0 ", laser ends, not luminous; Receiving element, when reception has light signal to input, exports high level " 1 ", during unglazed input, and output low level " 0 ".
When in RS-485, control interface bus logic is level "0", after bus arbitration processor logic conversion process, 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 "; Local side apparatus is when in RS-485, control interface bus logic is level"1", after bus arbitration processor logic conversion 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 local side apparatus when light receiving unit has light to input, export high level " 1 ", after bus arbitration processor logic conversion 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 local side apparatus is unglazed, output low level " 0 ", after bus arbitration processor logic conversion process, output logic high level " 1 " signal, makes control interface bus output logic " 1 " in RS-485.
The features such as it is a kind of integrated waveguide optical power distribution devices based on quartz base plate that planar waveguide-type optical branching device (PLC Splitter) designs, and have volume little, operating wavelength range is wide, and reliability is high, and point optical uniformity is good.
RS-485 cascade port has automatic reverse function, can switch transmission-receiving function automatically according to the state of data/address bus, and it is by the operating state of the time delay of a sophisticated design enable control circuit control RS-485 bus driver.Local side apparatus is when RS-485 cascade port bus logic is level "0", directly be transparent to control interface bus in RS-485 by bus arbitration processor, allow it also for logic be level "0" time, local side apparatus is when RS-485 cascade port bus logic is level"1", directly be transparent to control interface bus in RS-485 by bus arbitration processor, allow it also for logic be level"1" time, user can use the multiple local side apparatus of cascade ports-Extending to realize jumbo client terminal networking.
Bus arbitration processor is by high density, high speed CPLD or FPGA composition, by the digital logical operation of complexity, the communication logic completing each RS-485 fiber port controls, it is the core of whole system, the control command that RS-485 main central control end sends is broadcast to all Fiber Node ports by bus arbitration processor, allow all terminal nodes can receive the control command of RS-485 bus marco platform, when subscriber terminal equipment receives to one's name transmission instruction, light signal is converted to through passive light splitting RS-485 fiber buss terminal by needing the data submitted to, the bus arbitration processor of passive light splitting RS-485 fiber buss local side is sent to by optical fiber link, after the communication mechanism process of bus arbitration processor according to agreement, correct for data is sent to RS-485 bus marco end, thus realize the remote collection of data.
But the foregoing is only better possible embodiments of the present invention, and be not used to limit to the scope of the claims of the present invention, therefore the equivalent step done of all utilizations description of the present invention and structural change, be all included in protection scope of the present invention.
Claims (8)
1. a passive light splitting RS-485 fiber buss CMTS, is characterized in that, the RS-485 bus marco end of the industrial optical fiber bus of its two ends difference connected with passive light splitting and passive RS-485 Optical Network Terminal, it comprises interconnective power module, master control borad, multiple planar waveguide-type optical branching device and multiple light mouth, wherein, described master control borad comprises control interface in RS-232, control interface in RS-485, two-way RS-485 subtending port, multiple photoelectric conversion module and bus arbitration processor, in described RS-232, control interface is connected bus arbitration processor and RS-485 bus marco end with two-way RS-485 subtending port, described multiple photoelectric conversion module one end connects bus arbitration processor, the other end connects planar waveguide-type optical branching device one end, the planar waveguide-type optical branching device other end connects light mouth.
2. passive light splitting RS-485 fiber buss CMTS according to claim 1, it is characterized in that, it is by the conversion between light signal and bus logic signal, the control signal of RS-485 bus marco end is transferred to subscriber terminal equipment, controls subscriber terminal equipment; And the transfer of data fed back by subscriber terminal equipment is to RS-485 bus marco end.
3. passive light splitting RS-485 fiber buss CMTS according to claim 1, it is characterized in that, after RS-485 bus marco end sends control signal, after converting control signal to TTL logical signal " 0 " and " 1 " by passive RS-485 optical network local side, 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 Terminal, light signal is converted to RS-485 bus logic level signal, realize the control to terminal equipment.
4. passive light splitting RS-485 fiber buss CMTS according to claim 1, it is characterized in that, the data of subscriber terminal equipment feedback, by passive RS-485 Optical Network Terminal, data transaction is become TTL logical signal, then light signal is converted to according to TTL logical signal, be transmitted through the fiber to passive RS-485 optical network local side, light signal converted to RS-485 bus level or RS-232 level signal, then transfer to RS-485 bus marco end.
5. passive light splitting RS-485 fiber buss CMTS according to claim 1, it is characterized in that, described photoelectric conversion module comprises transmitter unit and receiving element, transmitter unit comprises laser driver and laser, receiving element comprises photodiode and amplifies comparison circuit, when transmitter unit receives the RS-485 bus logic level " 0 " of bus arbitration processor process, drive laser is luminous, send the light signal of logical zero, when receiving the RS-485 bus logic level " 1 " of bus arbitration processor process, drive circuit not drive laser is luminous, produce the light signal of logical one, the logical zero light signal that receiving element is receiving passive RS-485 Optical Network Terminal and sends, this light signal is converted to bus arbitration processor manageable logical one TTL high level signal, this signal is converted into logical zero TTL low level signal by bus arbitration processor, RS-485 bus marco end is sent to after delivering to RS-485 bus driver chip, when not having light signal to input, this light signal is converted to bus arbitration processor manageable logical zero TTL low level signal, this signal is converted into logical one TTL high level signal by bus arbitration processor, RS-485 bus marco end is sent to after delivering to RS-485 bus driver chip.
6. passive light splitting RS-485 fiber buss CMTS according to claim 1, it is characterized in that, described bus arbitration processor comprises process chip, and the reset circuit to be connected with this process chip, clock circuit, process chip power filter and decoupling circuit, DLL (dynamic link library) circuit, toggle switch circuit and Interface Expanding circuit.
7. passive light splitting RS-485 fiber buss CMTS according to claim 1, it is characterized in that, in described RS-232, control interface comprises bus driving circuits A, and the DC-DC power source circuit be connected with this bus driving circuits A, two photoelectric coupled circuit, interface card and lightning protection circuits.
8. passive light splitting RS-485 fiber buss CMTS according to claim 1, it is characterized in that, in described RS-485, control interface and RS-485 subtending port comprise bus driving circuits B, and the DC-DC power source circuit to be connected with this bus driving circuits B, two photoelectric coupled circuit, negative circuit, lightning protection circuit and interface card.
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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 |
| CN106059876B (en) * | 2016-06-22 | 2018-06-26 | 重庆世纪之光科技实业有限公司 | A kind of mode switch control method, equipment and the system of unidirectional serial bus network |
| CN106850052A (en) * | 2017-01-06 | 2017-06-13 | 东华大学 | A kind of active/standby light path hot backup system based on I TMUX for being applied to IP broadcast technology |
| CN107678998A (en) * | 2017-10-12 | 2018-02-09 | 上海宽域工业网络设备有限公司 | A kind of external serial server of toggle switch |
| CN107678998B (en) * | 2017-10-12 | 2019-10-15 | 上海宽域工业网络设备有限公司 | A kind of external serial server of toggle switch |
| CN111092690A (en) * | 2019-12-27 | 2020-05-01 | 京信通信***（中国）有限公司 | WDM-based baseband signal transmission device, method, storage medium and electronic device |
| CN111431606A (en) * | 2020-04-15 | 2020-07-17 | 联合华芯电子有限公司 | Bus type networking system for bidirectional optical fiber communication |
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| CN104734780B (en) | 2017-07-21 |
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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. |