CN102970078A - Optical fiber network system and method for performing asynchronous communication data transmission by system - Google Patents
Optical fiber network system and method for performing asynchronous communication data transmission by system Download PDFInfo
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- CN102970078A CN102970078A CN2012104464701A CN201210446470A CN102970078A CN 102970078 A CN102970078 A CN 102970078A CN 2012104464701 A CN2012104464701 A CN 2012104464701A CN 201210446470 A CN201210446470 A CN 201210446470A CN 102970078 A CN102970078 A CN 102970078A
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Abstract
The invention discloses an optical fiber network system and a method for performing asynchronous communication data transmission by the system. The system comprises a local side device and more than one terminal device, the local side device and each terminal device are connected through optical fibers to form a single loop or double loop serial optical fiber network, the local side device and each terminal device are respectively connected with optical communication modules, each optical communication module is provided with one or two optical receiving terminals and one or two optical sending terminals, and the optical fibers are connected with the optical receiving terminals and the optical sending terminals. The optical communication modules in the terminal devices negate a received data signal and then send the signal to next terminal device. According to the novel optical fiber network system and the method for performing the asynchronous communication data transmission by the system, the problem of error code during data transmission by the asynchronous communication in an electric power telecommunication system is solved, the key issue of asynchronous data transmission during electric power optical fiber communication is solved, and the development of an electric power optical fiber high speed communication network is facilitated.
Description
Technical field
The present invention discloses a kind of optical fiber network system and data transmission method, particularly a kind of optical fiber network system and adopt this system to carry out the method for asynchronous communication transfer of data.
Background technology
Development along with optical fiber technology, optical fiber transmission technique is used more and more extensive in people's daily life, at present, in the power optical fiber communication system, a kind of optical fiber communication scheme that adopts is that local side apparatus (such as concentrator) and polylith terminal equipment (such as ammeter) are connected and composed loop by optical module and fiber optic serial, forms optical fiber network system.On local side apparatus wherein (such as concentrator) and each terminal equipment (such as ammeter) with optical transmission module and Optical Receivers, during communication, the order data of asynchronous communication is to send through the optical transmission module from local side apparatus (such as concentrator) after the electric light conversion, light signal is delivered to the Optical Receivers of adjacent terminal equipment (such as ammeter) by optical fiber transmission, this moment, data were when being passed to terminal equipment (such as ammeter), also sent to next terminal equipment (such as ammeter) by the optical transmission module of this terminal equipment, through whole fiber optic network serial loop, data turn back to local side apparatus (such as concentrator) at last, and the data that terminal equipment (such as ammeter) is replied also will send to local side apparatus (such as concentrator) by this serial loop.Because the Optical Transmit Unit of optical transmission module has conditions of streaking, have unavoidably the phenomenon of pulse width variations in the transmission of data after the transmission of binary logic-high signal through Optical Receivers and light emission module, directly upload defeated mode at multi-stage fiber node loop if adopt above-mentioned asynchronous communication data, the mathematical logic level signal whenever is transmitted one group of Optical Receivers and light emission module, pulsewidth will change once, after the process Optical Receivers and light emission module of some, it is unusual that mathematical logic level signal pulsewidth will have relatively large deviation, be easy to cause error code, so that information errors.
Summary of the invention
Crossing serial optical fiber for the above-mentioned asynchronous communication data communication device of the prior art of mentioning directly transmits, cause easily the phenomenon of error code, the invention provides a kind of new optical fiber network system and adopt this system to carry out the method for asynchronous communication transfer of data, it adopts fiber optic network and the data transmission method of special construction, it is transmitted the data elder generation negate that receives again, can effectively avoid the phenomenon of pulse stretcher.
The technological means that the present invention solves its technical problem employing is: a kind of optical fiber network system, this system comprises local side apparatus and more than one terminal equipment, local side apparatus and each terminal equipment connect into monocycle or dicyclo serial fiber optic network by optical fiber, be connected with respectively optical communications module on described local side apparatus and each terminal equipment, send terminal with one or two light-receiving terminal and one or two light on the optical communications module, optical fiber is connected to the light-receiving terminal and light sends on the terminal.
A kind of method that adopts above-mentioned optical fiber network system to carry out the asynchronous communication transfer of data, the method are after the optical communications module in the terminal equipment will receive the data-signal negate, to send to next terminal equipment.
The technological means that the present invention adopts further comprises:
Described optical communications module comprises processor control unit, logical block and power subsystem, the optical receiving end sub-connection is on the input interface of logical block, an I/O mouth of processor control unit is connected on another interface of logical block, light transmitting terminal sub-connection is on the output interface of logical block, the light-receiving terminal is connected on another I/O mouth of processor control unit simultaneously, processor control unit control logic cell operation, power subsystem are given other unit power supplies.
Described optical communications module comprises one group or two groups of logical blocks.
Described logical block is logic gates.
Described optical communications module is connected on local side apparatus and the terminal equipment by the UART interface.
Described local side apparatus is concentrator, and described terminal equipment is ammeter, water meter, gas meter or gas meter, flow meter.
Described local side apparatus and terminal equipment are analyzed the data-signal that receives, and select to select with the data occupation mode thereby carry out the data retransmission mode.
The level situation of described data signal analysis method for by the data detection signal idle condition time analyzed it, if the level during idle condition is high level, then the data retransmission mode is reverse pass-through mode, and data are directly used; If the level during idle condition is low level, then the data retransmission mode is the forward pass-through mode, uses behind the data-conversion.
Described data signal analysis method is recently to determine the mode of operation of self by the duty of the high-low level of a data bit of data detection signal, if the high level in the data bit is wider than low level, then the data retransmission mode is reverse pass-through mode, and data are directly used; If the high level in the data bit is narrower than low level, then the data retransmission mode is the forward pass-through mode, uses behind the data-conversion.
The invention has the beneficial effects as follows: the present invention proposes a kind of new optical fiber network system and the method that occurs error code by employing asynchronous communication the transmission of data in this system's solution power communication system, solve the key issue of the simultaneous asynchronous data transmissions in the power optical fiber communication, be conducive to promote the development of power optical fiber high-speed communicating network.
The present invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is B, Y among the present invention, each signal schematic representation of T, R.
Fig. 2 is electricity meter-reading optical fiber network system schematic diagram among the present invention.
Fig. 3 is the optical module structure schematic diagram among the present invention.
Fig. 4 adopts A, B mode transfer process schematic diagram among the present invention.
Embodiment
Present embodiment is the preferred embodiment for the present invention, and other all its principles are identical with present embodiment or approximate with basic structure, all within protection range of the present invention.
Please referring to accompanying drawing 1, reception signal with optical communications module among the present invention is referred to as the B signal, the transmitted signal of optical communication module is referred to as Y(driving tube place) signal, the signal that sends to terminal equipment (such as ammeter) is referred to as the T signal, and the signal that terminal equipment (such as ammeter) sends is referred to as the R signal.In the present embodiment, the mode of operation of optical communications module self is defined as: send to terminal equipment (such as ammeter) a tunnel, the T signal equals the reverse signal that B signal or T signal equal the B signal; Send to next stage terminal equipment (such as ammeter) a tunnel, when forward mode was the A pattern, Y-signal equaled the R signal of T signal and a upper terminal equipment (such as ammeter); And reverse mode is when being the B pattern, and Y-signal equals the reverse signal of the R signal of T signal and a upper terminal equipment (such as ammeter).
Please referring to accompanying drawing 2 and accompanying drawing 3, optical fiber network system among the present invention comprises that a local side apparatus is (in the present embodiment, be specifically described as example as local side apparatus take concentrator) and more than one terminal equipment (in the present embodiment, be specifically described as example as local side apparatus take ammeter), in the present embodiment, (optical communications module can be used as the part of terminal equipment and local side apparatus to be connected with respectively optical communications module on concentrator and the ammeter, or independent peripheral hardware), in the present embodiment, optical communications module is connected with ammeter with concentrator by the UART mouth, on the optical communications module with one or two light-receiving terminal (in the present embodiment, be called for short FR), the quantity of light-receiving terminal is decided on monocycle fiber optic network or dicyclo fiber optic network, when using the monocycle fiber optic network, all ammeter terminals are by serial optical fiber link connection, and data then are to transmit along optical fiber link, at this moment, connecting a light-receiving terminal on the optical communications module gets final product; And when using the dicyclo fiber optic network, it is a kind of method of redundancy fault-tolerant, is on the basis of monocycle fiber optic network, additionally added a similarly reverse monocycle, the communication disruption that can prevent the monocycle fibre circuit from damaging and produce at this moment, is connected with two light-receiving terminals on the optical communications module.Also send terminal (in the present embodiment with one or two light on the optical communications module, abbreviation FT) quantity of light transmission terminal is decided on monocycle fiber optic network or dicyclo fiber optic network, when setting up the monocycle fiber optic network, a light-receiving terminal just is set, when setting up the dicyclo fiber optic network, two light-receiving terminals just are set, and optical fiber is connected on FR and the FT, and concentrator and each ammeter are connected into monocycle or dicyclo fiber optic network by optical fiber.Please referring to accompanying drawing 3, in this example, optical communications module comprises the processor control unit, logical block is (in the present embodiment, logical block adopts logic gates) and power subsystem, FR and FT are connected on the logical block, the data terminal of logical block with directly be connected with the processor control unit by the UART interface simultaneously, FR is connected with the I/O mouth of processor control unit, FR will receive signal and send into simultaneously the processor control unit and carry out level analysis, processor control unit control logic cell operation, power subsystem is given other unit power supplies, in the present embodiment, include two groups of logical blocks in the optical communications module, during implementation, also one group of logical block can only be set.In the present embodiment, the processor control unit, namely MCU mainly is responsible for detecting the level situation that receives, and in the present embodiment, adopts S1 signal controlling logical block, with the signal that guarantees that reception is correct; When sending, same according to detecting the received signal level situation, with S2 signal controlling logical block, to realize the forwarding of different mode in addition.
In above-described embodiment, be specifically described as example system and method for the present invention being applied in the ammeter, during implementation, the present invention can also be applied in the reading transcribing systems such as water meter, gas meter, gas meter, flow meter, and usage is identical.
Among the present invention, utilize the principle of asynchronous communication generation error code to solve the problem of error code, because the conditions of streaking of Optical Transmit Unit has caused the phenomenon that binary logic-high signal pulsewidth broadens in the transmission of data, in three grades of nodes (i.e. node more than three or three) serial link, the phenomenon of high level pulse stretcher has occured in the data-signal of second node reception, this time only need to be with the data-signal negate, then pulsewidth becomes high level after by the low level negate of constriction, it is through recovering normal after the pulse stretcher phenomenon of next stage, so the 3rd node will receive accurately data-signal.Utilize this principle, only need to then can correct pulse stretcher at the node at interval first to the data-signal negate, thereby solve the data transmission error phenomenon of plural serial stage node link.In the present embodiment, the node to the data-signal negate not is operated in the forward forward mode, or be called the A pattern, under this kind pattern, if contain control command in the data-signal, then control command is directly effective to this node, namely this node is directly controlled, and the node that data-signal carries out first negate is operated in reverse forward mode, or be called the B pattern, under this kind pattern, if contain control command in the data-signal, then effective to this node after the control command negate, be about to after the negate of control command signal this node be controlled.
Among the present invention, optical communications module is selected mode of operation adaptively by analyzing the data-signal that receives, be A pattern or B pattern, optical communications module possesses data selection transparent transmission function simultaneously, be that it can be with the data truncation that self sends, and the data that send of other module of transparent transmission link the inside only, thereby avoided the generation of Data Storm.In the present embodiment, optical communications module can be differentiated the data-signal that receives by following dual mode: one, the level of optical communications module when judging the data-signal idle condition decides mode of operation, concrete principle is that serial ports is high level when idle condition, if data-signal by negate after, then idle condition will become low level, level during by the data detection signal idle condition can decision data in previous stage whether by negate, thereby judge the mode of operation of a upper node, the mode of operation of this node is as long as just can reach pulsewidth rectification on the contrary with a upper node, thus the problem of solution data transmission error code.When this scheme of employing, the mode of operation of multistage node is ABABABABAB or ABABABABABA.Two, optical communications module decides the mode of operation of self by the duty ratio of the high-low level of a data bit of data detection signal.If concrete principle is that the data bit high level is wider than low level, illustrate that then data-signal is by the forward broadening, then this node should be operated in reverse transparent transmission mode (being the B pattern) so that data-signal is corrected, opposite, if the data bit high level is identical with low level width or high level is narrower than low level, illustrate that then data-signal has been reversed broadening, then this node should be operated in forward transparent transmission mode (being the A pattern).
The present invention proposes a kind of new optical fiber network system, and by adopting asynchronous communication data optical fiber to transfer out the method for existing error code in this system's solution power communication system, solve the key issue of the simultaneous asynchronous data transmissions in the power optical fiber communication, be conducive to promote the development of power optical fiber high-speed communicating network.
Claims (10)
1. optical fiber network system, it is characterized in that: described system comprises local side apparatus and more than one terminal equipment, local side apparatus and each terminal equipment connect into monocycle or dicyclo serial fiber optic network by optical fiber, be connected with respectively optical communications module on described local side apparatus and each terminal equipment, send terminal with one or two light-receiving terminal and one or two light on the optical communications module, optical fiber is connected to the light-receiving terminal and light sends on the terminal.
2. optical fiber network system according to claim 1, it is characterized in that: described optical communications module comprises processor control unit, logical block and power subsystem, the optical receiving end sub-connection is on the input interface of logical block, an I/O mouth of processor control unit is connected on another interface of logical block, light transmitting terminal sub-connection is on the output interface of logical block, the light-receiving terminal is connected on another I/O mouth of processor control unit simultaneously, processor control unit control logic cell operation, power subsystem are given other unit power supplies.
3. optical fiber network system according to claim 1, it is characterized in that: described optical communications module comprises one group or two groups of logical blocks.
4. according to claim 2 or 3 described optical fiber network systems, it is characterized in that: described logical block is logic gates.
5. according to claim 1 and 2 or 3 described optical fiber network systems, it is characterized in that: described optical communications module is connected on local side apparatus and the terminal equipment by the UART interface.
6. according to claim 1 and 2 or 3 described optical fiber network systems, it is characterized in that: described local side apparatus is concentrator, and described terminal equipment is ammeter, water meter, gas meter or gas meter, flow meter.
7. the described optical fiber network system of any one carries out the method for asynchronous communication transfer of data in an employing such as the claim 1 to 6, it is characterized in that: described method is after the optical communications module in the terminal equipment will receive the data-signal negate, to send to next terminal equipment.
8. method according to claim 7, it is characterized in that: described local side apparatus and terminal equipment are analyzed the data-signal that receives, and select to select with the data occupation mode thereby carry out the data retransmission mode.
9. method according to claim 8, it is characterized in that: the level situation of described data signal analysis method for by the data detection signal idle condition time analyzed it, if the level during idle condition is high level, then the data retransmission mode is reverse pass-through mode, and data are directly used; If the level during idle condition is low level, then the data retransmission mode is the forward pass-through mode, uses behind the data-conversion.
10. method according to claim 8, it is characterized in that: described data signal analysis method is recently to determine the mode of operation of self by the duty of the high-low level of a data bit of data detection signal, if the high level in the data bit is wider than low level, then the data retransmission mode is reverse pass-through mode, and data are directly used; If the high level in the data bit is identical with low level width or high level is narrower than low level, then the data retransmission mode is the forward pass-through mode, uses behind the data-conversion.
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| CN103714693A (en) * | 2014-01-15 | 2014-04-09 | 深圳市好通家实业有限公司 | Meter reading system and method based on plastic fibers |
| CN104022828A (en) * | 2014-05-16 | 2014-09-03 | 天津大学 | Fiber data transmission method based on asynchronous communication mode |
| CN104882966A (en) * | 2015-06-08 | 2015-09-02 | 国网山东龙口市供电公司 | Distribution network automation communication system |
| CN109088672A (en) * | 2018-10-25 | 2018-12-25 | 南方电网科学研究院有限责任公司 | A kind of multiple spot concurrent communication method based on plastic optical fiber |
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| CN102820926A (en) * | 2012-08-21 | 2012-12-12 | 深圳市开锐光通信技术有限公司 | Optical fiber network system and method thereby for modulating and demodulating asynchronous communication data on optical fiber transmission |
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| JP2001255191A (en) * | 2000-03-13 | 2001-09-21 | Tokyo Gas Co Ltd | Gas meter and optical radio communication system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103714693A (en) * | 2014-01-15 | 2014-04-09 | 深圳市好通家实业有限公司 | Meter reading system and method based on plastic fibers |
| CN104022828A (en) * | 2014-05-16 | 2014-09-03 | 天津大学 | Fiber data transmission method based on asynchronous communication mode |
| CN104022828B (en) * | 2014-05-16 | 2016-07-06 | 天津大学 | A kind of optical fiber data transmission method based on asynchronous communication model |
| CN104882966A (en) * | 2015-06-08 | 2015-09-02 | 国网山东龙口市供电公司 | Distribution network automation communication system |
| CN109088672A (en) * | 2018-10-25 | 2018-12-25 | 南方电网科学研究院有限责任公司 | A kind of multiple spot concurrent communication method based on plastic optical fiber |
| CN109088672B (en) * | 2018-10-25 | 2021-12-28 | 南方电网科学研究院有限责任公司 | Multipoint concurrent communication method based on plastic optical fiber |
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