CN104618020B - A kind of passive fiber buss single port terminals of light splitting RS 485 - Google Patents
A kind of passive fiber buss single port terminals of light splitting RS 485 Download PDFInfo
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- CN104618020B CN104618020B CN201410834077.9A CN201410834077A CN104618020B CN 104618020 B CN104618020 B CN 104618020B CN 201410834077 A CN201410834077 A CN 201410834077A CN 104618020 B CN104618020 B CN 104618020B
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Abstract
The invention discloses a kind of passive fiber buss single port terminals of light splitting RS 485,It is characterized in that,The optical network local sides of passive RS 485 and terminal device of its both ends difference connected with passive light splitting fiber buss of RS 485,It includes power module,Photoelectric conversion module,Phase conversion circuit,The driving chips of RS 485,Two high speed photo coupling circuits,Nonpolarity automatic transceiving commutating circuit and three-level lightning protection circuit,Wherein,Described photoelectric conversion module one end connection phase conversion circuit one end,The phase conversion circuit other end connects the first high speed photo coupling circuit on one side and the second high speed photo coupling circuit on one side,The first high speed photo coupling circuit other end connects nonpolarity automatic transceiving commutating circuit one end and the driving chips of RS 485,The nonpolarity automatic transceiving commutating circuit other end connects the driving chips of RS 485,The second high speed photo coupling circuit other end connects the driving chips of RS 485,Three-level lightning protection circuit connects the driving chips of RS 485.
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 single port terminals.
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 be exactly IT application in enterprises needs, 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 ", and+2V~+6V represents " 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 more using two
The line mode of connection, this mode of connection are that bus type topological structure typically can at most mount 32 knots on same bus
Point.Master-slave communication mode, the i.e. multiple slaves of host tape are generally adopted by RS-485 communication networks.Connect RS-485
" A " of each interface, " B " end are connected with a pair of twisted-pair feeders during communication link.
Traditional network topology typically uses the bus type structure of terminal coupling, does not support annular or star network.Networking
Medium mainly has twisted-pair cable and optical fiber, and twisted-pair cable and optical fiber have following problem when building network：
(1) common mode disturbances：RS-485 interfaces use differential mode transmission signal mode, and need not be relative to some reference
Point carrys out detection signal, and system need to only detect the potential difference can between two lines.But people, which often ignore transceiver, one
Fixed common-mode voltage range, RS-485 transceivers common-mode voltage range are -7~+12V, only meet above-mentioned condition, whole network
Could normal work.The reliable and stable of communication, or even damage will be influenceed when common-mode voltage exceeds this scope in network line
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 is 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) maximum communication distance for making bus using a twisted-pair cable is about 1219m, and peak transfer rate is
10Mbps, transmission rate are 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 single port terminal of communication reliability.
The used to achieve the above object technical scheme of the present invention is：
A kind of passive light splitting RS-485 fiber buss single port terminals, its both ends difference connected with passive light splitting RS-485 optical fiber are total
Passive the RS-485 optical network local sides and subscriber terminal equipment of line, it includes power module, photoelectric conversion module, phase transition electricity
Road, RS-485 driving chips, two high speed photo coupling circuits, nonpolarity automatic transceiving commutating circuit and three-level lightning protection circuit, wherein,
Described photoelectric conversion module one end connection phase conversion circuit one end, the phase conversion circuit other end connect the first high speed photo coupling electricity
Road one end and the second high speed photo coupling circuit on one side, the first high speed photo coupling circuit other end connect nonpolarity automatic transceiving commutating circuit
One end and RS-485 driving chips, the nonpolarity automatic transceiving commutating circuit other end connect RS-485 driving chips, and second at a high speed
The photoelectric coupled circuit other end connects RS-485 driving chips, three-level lightning protection circuit connection RS-485 driving chips.
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 by the data transfer of subscriber terminal equipment feedback to RS-
485 bus marco ends.
After RS-485 bus marcos end sends control signal, control signal is converted into by passive RS-485 optical network local sides
Optical signal, and single port terminal is transmitted through the fiber to, the conversion between single port terminal optical signal and bus logic signal, light is believed
After number being converted into TTL logical signals " 0 " and " 1 ", RS-485 level signals are converted to through RS-485 driving chips, to user terminal
Equipment is controlled；It is RS-485 bus logics " 0 " signal to be wherein corresponding with optical output signal, corresponding to be without optical output signal
RS-485 bus logics " 1 " signal.
The data of terminal device feedback, after control signal is converted into TTL logical signals " 0 " and " 1 " by single port terminal,
Then TTL logical signals are converted into optical signal, wherein corresponding RS-485 bus logic " 0 " signal is has optical output signal, it is right
It is to be transmitted through the fiber to passive RS-485 light net without optical output signal, and by optical signal to answer RS-485 bus logics " 1 " signal
Network local side, RS-485 bus levels or RS-232 level signals are converted optical signals into, be then transmit to the total line traffic controls of RS-485
End processed.
When subscriber terminal equipment is not received by the upload data command that local side apparatus issues, single port terminal can only be in and detect
State is listened, any data will not be sent to bus, the data sending request of all single port terminals is all by RS-485 main central controls
Platform arbitration process processed.
Single port terminal is not when sending data, i.e. RS-485 bus frees, when being logical one (high level), optical interface list
The emitter of member can't send the laser of intensity；Single port terminal when sending logical zero (low level), UFIU UMSC Fiber Interface Unit
Launching opportunity sends the laser of some strength, to represent logical zero, single port terminal when sending logical one (high level),
The emitter of UFIU UMSC Fiber Interface Unit can't send the laser of intensity.
The photoelectric conversion module includes transmitter unit and receiving unit；Transmitter unit includes laser driver and laser
Device；Receiving unit includes photodiode and zoom comparison circuit.
By having light representations RS-485 bus logics " 0 " signal, no light representations RS-485 bus logics " 1 " signal；Bus
For equipment when not sending signal, the photoelectric conversion module Optical Transmit Unit of itself can not send the optical signal more than prescribed strength
Out, i.e., to possess transmitting arbitration functions when sending RS-485 bus logics " 1 ", prevent that bus is chaotic and causes nothing
The failure of method communication.
For RS-485 buses when not sending data, bus is forced logical one (high level) state, when transmission logic
During " 1 " (high level) signal, RS485 bus levels keep logical one (high level) state without saltus step；And when transmission is patrolled
When collecting " 0 " (low level), RS-485 buses are logical zero (low level) by the saltus step of high level logic level"1", are patrolled when having sent
After volume " 0 " signal, bus logic state reverts to logical one (high level) and maintained until next logical zero signal again
Arrive.
Single port terminal is defeated after the processing of bus phase conversion circuit when RS-485 interface bus logic is level "0"
Go out logic high " 1 " signal, now the laser driver driving laser of the Optical Transmit Unit of photoelectric conversion module is sent
Laser signal with some strength, the signal is representing RS-485 bus logics " 0 "；Single port terminal is total in RS-485 interfaces
When line logic is level"1", after phase conversion circuit is handled, logic high " 0 " signal is exported, photoelectric conversion module
The laser driver driving cut-off of Optical Transmit Unit, forces laser not send laser signal, the signal condition represents RS-
485 bus logics " 1 "；The photoelectric conversion module of single port terminal when light receiving unit has light input, export low level " 1 ",
After phase conversion circuit is handled, logic high " 0 " signal is exported, makes to control interface bus output logical zero in RS-485,
During input that the light receiving unit of the photoelectric conversion module of single port terminal is unglazed, low level " 0 " is exported, at phase conversion circuit
After reason, logic high " 1 " signal is exported, makes to control interface bus output logical one in RS-485.
The beneficial effects of the invention are as follows：The single port terminal of the present invention, it is the constructing communication network of point-to-multipoint, using slab guide
Type optical branching device (PLC, it can be integrated among local side apparatus, can also be independently of local side apparatus outside) direct nothing of spectroscopic modes
RS-485 signals are transmitted in source, need not move through protocol conversion, it is not necessary to change original network architecture, compared to using TCP/IP networks
Transmission means, whole system very simple.Using the master of point-to-multipoint -- from structure, a passive RS-485 optical network local side is most
Greatly can 128 nodes of carry, can be with carry 128* by the RS-485 expansion interfaces cascade of n passive RS-485 optical network local sides
N network node, greatly improve the message capacity of system.Conventional point-to-point optical fiber connected mode needs two equipment pair
Connect, and now using point-to-multipoint master -- from optical fiber solutions, multiple subscriber terminal equipments share a local side apparatus, and entirely
Local side apparatus cost is many compared to save in the past.
Efficiently solve in the prior art, common mode disturbances, EMI, communication distance problem, 10 kilometers to 40 kilometers can be transmitted
(depending on planar waveguide-type optical branching device splitting ratio)；The problem of traffic rate influences each other with transmission range；Signal due to
Reflection caused by impedance discontinuity；Lifting system anti-lightning protective capacities, using all communication nodes of Fiber isolation, own simultaneously
RS-485 ONT Optical Network Terminals use the superpower shocking preventing technology of three-level, thoroughly solve destruction harm of the thunderbolt to whole system.
Brief description of the drawings
Fig. 1 is structured flowchart of the present invention；
Fig. 2 is bus system block diagram of the present invention；
Fig. 3 is phase conversion circuit of the present invention, and RS-485 driving chips, two high speed photo coupling circuits are nonpolarity to receive automatically
Send out commutating circuit and three-level lightning protection circuit circuit diagram；
Fig. 4 is power module circuitry figure of the present invention；
Fig. 5 is power isolation circuit figure of the present invention；
Fig. 6 is indicating circuit figure of the present invention；
Fig. 7 is peripheral circuit diagram of the present invention.
Embodiment
Embodiment：Referring to Fig. 1 to Fig. 7, the present embodiment provides a kind of passive light splitting RS-485 fiber buss single port terminals, its
Passive the RS-485 optical network local sides and terminal device of both ends difference connected with passive light splitting RS-485 fiber buss, it includes power supply
Module, photoelectric conversion module, phase conversion circuit, RS-485 driving chips, two high speed photo coupling circuits, nonpolarity automatic transceiving
Commutating circuit and three-level lightning protection circuit, wherein, described photoelectric conversion module one end connection phase conversion circuit one end, phase transition
The circuit other end connects the first high speed photo coupling circuit on one side and the second high speed photo coupling circuit on one side, the first high speed photo coupling circuit are another
End connects nonpolarity automatic transceiving commutating circuit one end and RS-485 driving chips, the nonpolarity automatic transceiving commutating circuit other end
Connect RS-485 driving chips, second high speed photo coupling circuit other end connection RS-485 driving chips, the connection of three-level lightning protection circuit
RS-485 driving chips.
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 by the data transfer of subscriber terminal equipment feedback to RS-
485 bus marco ends.
After RS-485 bus marcos end sends control signal, control signal is converted into by passive RS-485 optical network local sides
Optical signal, and single port terminal is transmitted through the fiber to, the conversion between single port terminal optical signal and bus logic signal, light is believed
After number being converted into TTL logical signals " 0 " and " 1 ", RS-485 level signals are converted to through RS-485 driving chips, to user terminal
Equipment is controlled；It is RS-485 bus logics " 0 " signal to be wherein corresponding with optical output signal, corresponding to be without optical output signal
RS-485 bus logics " 1 " signal.
The data of terminal device feedback, after control signal is converted into TTL logical signals " 0 " and " 1 " by single port terminal,
Then TTL logical signals are converted into optical signal, wherein corresponding RS-485 bus logic " 0 " signal is has optical output signal, it is right
It is to be transmitted through the fiber to passive RS-485 light net without optical output signal, and by optical signal to answer RS-485 bus logics " 1 " signal
Network local side, RS-485 bus levels or RS-232 level signals are converted optical signals into, be then transmit to the total line traffic controls of RS-485
End processed.
When subscriber terminal equipment is not received by the upload data command that local side apparatus issues, single port terminal can only be in and detect
State is listened, any data will not be sent to bus, the data sending request of all single port terminals is all by RS-485 main central controls
Platform arbitration process processed.
Single port terminal is not when sending data, i.e. RS-485 bus frees, when being logical one (high level), optical interface list
The emitter of member can't send the laser of intensity；Single port terminal when sending logical zero (low level), UFIU UMSC Fiber Interface Unit
Launching opportunity sends the laser of some strength, to represent logical zero, single port terminal when sending logical one (high level),
The emitter of UFIU UMSC Fiber Interface Unit can't send the laser of intensity.
The photoelectric conversion module includes transmitter unit and receiving unit；Transmitter unit includes laser driver and laser
Device；Receiving unit includes photodiode and zoom comparison circuit.
By having light representations RS-485 bus logics " 0 " signal, no light representations RS-485 bus logics " 1 " signal；Bus
For equipment when not sending signal, the photoelectric conversion module Optical Transmit Unit of itself can not send the optical signal more than prescribed strength
Out, i.e., to possess transmitting arbitration functions when sending RS-485 bus logics " 1 ", prevent that bus is chaotic and causes nothing
The failure of method communication.
For RS-485 buses when not sending data, bus is forced logical one (high level) state, when transmission logic
During " 1 " (high level) signal, RS485 bus levels keep logical one (high level) state without saltus step；And when transmission is patrolled
When collecting " 0 " (low level), RS-485 buses are logical zero (low level) by the saltus step of high level logic level"1", are patrolled when having sent
After volume " 0 " signal, bus logic state reverts to logical one (high level) and maintained until next logical zero signal again
Arrive.
Single port terminal is defeated after the processing of bus phase conversion circuit when RS-485 interface bus logic is level "0"
Go out logic high " 1 " signal, now the laser driver driving laser of the Optical Transmit Unit of photoelectric conversion module is sent
Laser signal with some strength, the signal is representing RS-485 bus logics " 0 "；Single port terminal is total in RS-485 interfaces
When line logic is level"1", after phase conversion circuit is handled, logic high " 0 " signal is exported, photoelectric conversion module
The laser driver driving cut-off of Optical Transmit Unit, forces laser not send laser signal, the signal condition represents RS-
485 bus logics " 1 "；The photoelectric conversion module of single port terminal when light receiving unit has light input, export low level " 1 ",
After phase conversion circuit is handled, logic high " 0 " signal is exported, makes to control interface bus output logical zero in RS-485,
During input that the light receiving unit of the photoelectric conversion module of single port terminal is unglazed, low level " 0 " is exported, at phase conversion circuit
After reason, logic high " 1 " signal is exported, makes to control interface bus output logical one in RS-485.
High speed photo coupling isolation circuit is to isolate RS-485 buses with photoelectricity to turn with the main function of DC-DC insulating power supply modules
Change the mold block between, the electrical connection of electric power system, photoelectric conversion module and electric power system can be protected.Nonpolarity automatic transceiving changes
It is to realize the automatic switchover of RS-485 bus transceiving datas to the function of circuit, is a kind of enabled control of delay, circuit parameter passes through
Careful design is crossed, it is possible to prevente effectively from false triggering, avoids bus from producing mistake.Three-level lightning protection network its by high-quality TVS transient states
Suppress diode, ceramic gas discharge tube, resettable fuse composition three-level high-performance anti thunder strike circuit, IEC6100- can be passed through
4-54 level standards：1.2/50us 4KV 8/20us 2KA.
The operation principle of passive light splitting RS-485 fiber buss system single port terminals is as follows：The opto-electronic conversion mould of single port terminal
Block when light receiving unit has light input, export high level " 1 ", after phase conversion circuit is handled, export logically high electricity
Flat " 0 " signal, makes RS-485 buses export logical zero, the unglazed input of light receiving unit of the photoelectric conversion module of single port terminal
When, low level " 0 " is exported, after phase conversion circuit is handled, exports logic high " 1 " signal, connects control in RS-485
Mouth bus output logical one.Single port terminal is when RS-485 bus logics are level "0", after phase conversion circuit is handled,
Logic high " 1 " signal is exported, high speed photo coupling is to be isolated together, now the laser of the Optical Transmit Unit of photoelectric conversion module
Driver driving laser sends the laser signal with some strength, and the signal is representing RS-485 bus logics " 0 "；It is single
Mouth terminal is when RS-485 bus logics are level"1", after phase conversion circuit is handled, output logic high " 0 " letter
Number, the laser driver driving cut-off of the Optical Transmit Unit of photoelectric conversion module, force laser not send laser signal, should
Signal condition represents RS-485 bus logics " 1 "；
The RS-485 drive circuits of passive light splitting RS-485 fiber buss system single port terminals have automatic reverse function, can
Transmission-receiving function is automatically switched with the state according to data/address bus, it enables control circuit to control by the delay of a sophisticated design
The working condition of RS-485 bus drivers processed.The RS-485 buses of single port terminal can be always in when data are not sent
State is intercepted, and RS-485 driving chips can keep exporting a high level, until the arrival of level "0", can just change
State, the photoelectric conversion module of single port terminal when light receiving unit has light input, export high level " 1 ", by phase turn
After changing processing of circuit, logical zero (low level) signal is exported, this signal is sent to automatic reversing circuit, commutating circuit meeting simultaneously
Output one high level " 1 " to RS-485 bus drivers transmission Enable Pin and receive Enable Pin (send enable high level have
Effect, it is effective to receive enabled low level), make driver effective, logical zero (low level) signal is transmitted to RS-485 buses；Single port
The photoelectric conversion module of terminal in the unglazed input of light receiving unit, export low level " 0 ", handled by phase conversion circuit
Afterwards, logical one (high level) signal is exported, this signal is sent to automatic reversing circuit simultaneously, and commutating circuit can export one and patrol
Volume " 0 " (low level) to RS-485 bus drivers transmission Enable Pin and receive Enable Pin and (it is effective to send enabled high level, connects
It is effective to receive enabled low level), allowing driver, reception enables is in reception state, RS- for low level, RS-485 buses without effective
The state of 485 buses determines state (being a high level logic one state) by the upper pull down resistor of bus, is equal to RS-
485 buses transmit logical one (high level) signal.
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
All equivalent steps and structure change made with present specification, are all contained in protection scope of the present invention.
Claims (6)
- A kind of 1. passive light splitting RS-485 fiber buss single port terminals, it is characterised in that its both ends difference connected with passive light splitting RS- Passive the RS-485 optical network local sides and terminal device of 485 fiber buss, it includes phase transition unit, photoelectric conversion unit, The photoelectric conversion unit includes transmitter unit and receiving unit；, will by the conversion between optical signal and bus logic signal The control signal at RS-485 bus marcos end is transmitted to subscriber terminal equipment, and subscriber terminal equipment is controlled；And it will use The data transfer of family terminal device feedback realizes the two-way communication of point-to-multipoint to RS-485 bus marcos end.
- 2. passive light splitting RS-485 fiber buss single port terminals according to claim 1, it is characterised in that RS-485 buses After control terminal sends control signal, control signal is converted into optical signal by passive RS-485 optical network local sides, and pass through optical fiber Transmit to single port terminal, the conversion between single port terminal optical signal and bus logic signal, convert optical signals into TTL logics letter After number " 0 " and " 1 ", RS-485 level signals are converted to through RS-485 driving chips, subscriber terminal equipment is controlled；Wherein It is RS-485 bus logics " 0 " signal to be corresponding with optical output signal, corresponding to believe without optical output signal for RS-485 bus logics " 1 " Number.
- 3. passive light splitting RS-485 fiber buss single port terminals according to claim 1, it is characterised in that user terminal is set The data of standby feedback, after control signal is converted into TTL logical signals " 0 " and " 1 " by single port terminal, then by TTL logics Signal is converted into optical signal, wherein corresponding RS-485 bus logic " 0 " signal is has optical output signal, corresponding RS-485 buses are patrolled It is to be transmitted through the fiber to passive RS-485 optical network local sides without optical output signal, and by optical signal to collect " 1 " signal, by optical signal RS-485 bus levels or RS-232 level signals are converted into, is then transmit to RS-485 bus marcos end.
- 4. passive light splitting RS-485 fiber buss single port terminals according to claim 1, it is characterised in that user terminal is set Standby when being not received by the upload data command that local side apparatus issues, single port terminal can only be in and intercept state, will not be to bus Any data are sent, the data sending request of all single port terminals is all by RS-485 bus marcos end arbitration process.
- 5. passive light splitting RS-485 fiber buss single port terminals according to claim 1, it is characterised in that single port terminal exists When not sending data, i.e. RS-485 bus frees, when being that logical one is high electric, the emitter of UFIU UMSC Fiber Interface Unit can't have been sent The laser of intensity；For single port terminal when sending logical zero low level, the launching opportunity of UFIU UMSC Fiber Interface Unit sends some strength Laser, to represent logical zero, when sending logical one high level, the emitter of UFIU UMSC Fiber Interface Unit can't be sent out single port terminal Go out to have the laser of intensity.
- 6. passive light splitting RS-485 fiber buss single port terminals according to claim 1, it is characterised in that by there is light table Show RS-485 bus logics " 0 " signal, no light representations RS-485 bus logics " 1 " signal；Bus apparatus when not sending signal, The optical signal that the photoelectric conversion module Optical Transmit Unit of itself can not send more than prescribed strength comes out, that is, is sending RS-485 During bus logic " 1 ", to possess transmitting arbitration functions, prevent that bus is chaotic and leads to not the failure of communication.
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| CN201410834077.9A CN104618020B (en) | 2014-12-29 | 2014-12-29 | A kind of passive fiber buss single port terminals of light splitting RS 485 |
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| CN104618020B true CN104618020B (en) | 2018-03-27 |
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| CN105429122B (en) * | 2015-11-16 | 2018-11-13 | 国网山东省电力公司济宁供电公司 | A kind of nonpolarity RS485 protection adapter circuit |
| CN106950890B (en) * | 2017-04-28 | 2023-06-20 | 南京搜新智能科技有限公司 | Intelligent switch circuit based on double 485 communication |
| CN109448357A (en) * | 2018-12-29 | 2019-03-08 | 刘向宁 | Teledata collection copies fiber optic communications devices, collector and single line communication network system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202872757U (en) * | 2012-10-31 | 2013-04-10 | 袁维益 | RS485 photoelectric communication conversion device |
| CN103236835A (en) * | 2013-04-09 | 2013-08-07 | 浙江威星智能仪表股份有限公司 | Signal isolation grid circuit |
| CN203300035U (en) * | 2013-04-25 | 2013-11-20 | 国家电网公司 | Acquirer and power utilization information acquiring system |
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| US7970437B2 (en) * | 2000-11-29 | 2011-06-28 | Nokia Corporation | Wireless terminal device with user interaction system |
| US8341184B2 (en) * | 2008-05-07 | 2012-12-25 | Smooth Productions Inc. | Communications network system and service provider |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202872757U (en) * | 2012-10-31 | 2013-04-10 | 袁维益 | RS485 photoelectric communication conversion device |
| CN103236835A (en) * | 2013-04-09 | 2013-08-07 | 浙江威星智能仪表股份有限公司 | Signal isolation grid circuit |
| CN203300035U (en) * | 2013-04-25 | 2013-11-20 | 国家电网公司 | Acquirer and power utilization information acquiring system |
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