CN105721059B - Profibus-DP photoelectric signal transformation systems - Google Patents
Profibus-DP photoelectric signal transformation systems Download PDFInfo
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- CN105721059B CN105721059B CN201610214491.9A CN201610214491A CN105721059B CN 105721059 B CN105721059 B CN 105721059B CN 201610214491 A CN201610214491 A CN 201610214491A CN 105721059 B CN105721059 B CN 105721059B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
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- 230000005540 biological transmission Effects 0.000 claims description 20
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- 238000004891 communication Methods 0.000 description 11
- 230000005622 photoelectricity Effects 0.000 description 6
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40221—Profibus
Abstract
The present invention discloses a kind of Profibus DP photoelectric signal transformation systems, including photoelectric converter, receives optical signal and converts thereof into Transistor-Transistor Logic level signal or receive Transistor-Transistor Logic level signal and convert thereof into optical signal；Data transmit-receive logic control circuit includes the three state buffer for being connected to photoelectric converter, and the transmitting-receiving control terminal of three state buffer is connected with delay circuit and the first schmitt inverter in turn；Electrical isolation and differential signal conversion circuit comprising differential level converter, differential level converter are connected to photoelectric converter to receive and dispatch Transistor-Transistor Logic level signal；Differential level converter is connected to the first schmitt inverter output end to receive and dispatch control sequential logical signal；Differential level converter output end is connected with Profibus DP buses to receive and dispatch Profibus DP differential signals.The real-time of Profibus DP photoelectric signal transformation systems provided by the invention and flexibility are preferable.
Description
Technical field
The present invention relates to photoelectric conversion technique fields, it is more particularly related to a kind of Profibus-DP optical telecommunications
Number converting system.
Background technology
Profibus-DP is the common field bus communication side of the industrial automations such as electric power, petrochemical industry, machine-building
Formula is mainly used for the communication of device level control system and distributing I/O, and physical layer uses differential signal transmission mode, it
With Profibus-PA (Process Automation), Profibus-FMS (Fieldbus Message
Specification Profibus standards) have been collectively constituted, there is the characteristic of high speed low cost.With the hair of automatic technology
Exhibition, communication network become increasingly complex, and communication distance is more and more remoter, and the requirement to digital communication reliability is also higher and higher,
The easy strong-electromagnetic field by industry spot of the electric signal of Profibus-DP buses interferes, and communication reliability is affected, and
Electric signal can comparatively fast decay with the increase of cable length, and communication distance is also by larger limitation.And the transmission of optical signal
It not by the interference of electromagnetic field and influences completely, the decaying of optical signal decays much smaller compared with electric signal, therefore uses optical cable transmission signal
It can be improved that transmission channel is anti-interference and reliability, dramatically increase communication distance.It is also begun in Modern New industrial automation equipment
Fiber optic communication is gradually used, still, the Profibus-DP bus physical layers in some traditional electric power and industrial measurement and control device are simultaneously
Without fiber optic cable interface, therefore addition Profibus-DP optical signal conversion modules can be used in communication is transformed and realize optic communication.
In the prior art, Profibus-DP photoelectric signal transformations usually have following two modes：(1) use microcontroller,
The different peripheral interfaces of the microprogramming devices such as ARM, DSP realize sending and receiving for optical signal and electric signal respectively；(2) using can
Programmed digital logic device carries out the transmitting-receiving control of data packet, realizes the logical channel that two kinds of signals are converted mutually.But this two
Kind scheme is that the mutual conversion of photoelectricity differential signal is realized in data link layer, and transfer process has larger delay, can only
It is packaged transmission again after receiving data packet, real-time is poor, and baud rate needs are preset, and do not meet the number of default baud rate
According to can not correctly transmit.
Invention content
Shortcoming present in view of the above technology, a kind of real-time of present invention offer and flexibility are preferable
Profibus-DP photoelectric signal transformation systems.
In order to realize these purposes and other advantages according to the present invention, the invention is realized by the following technical scheme：
Profibus-DP photoelectric signal transformations system of the present invention, including：
Photoelectric converter, receive optical signal and convert thereof into Transistor-Transistor Logic level signal or receive Transistor-Transistor Logic level signal and by its
It is converted into optical signal；
Data transmit-receive logic control circuit comprising be connected to the three state buffer of the photoelectric converter, the tri-state
Buffer is connected with delay circuit and the first schmitt inverter in turn；
Electrical isolation and differential signal conversion circuit comprising differential level converter, the differential level converter connect
The photoelectric converter is connected to receive and dispatch Transistor-Transistor Logic level signal；It is anti-that the differential level converter is connected to first Schmidt
Phase device output end is to obtain transmitting-receiving control sequential logical signal；The differential level converter output end is connected with Profibus-
DP buses are to receive and dispatch Profibus-DP differential signals；
First Transistor-Transistor Logic level port of the differential level converter is connected to the transmitting terminal of the photoelectric converter, described
Second Transistor-Transistor Logic level port of differential level converter is connected to the receiving terminal of the photoelectric converter；The differential level conversion
The transmitting-receiving control terminal of device passes sequentially through the intermediate ends of first schmitt inverter of two series aiding connections, the delay circuit
It is connected to the three state buffer.
Preferably, further include the first indicator light circuit of fault alarm, first indicator light circuit is connected to described
The fault-signal output end of photoelectric converter.
Preferably, between the photoelectric converter and first indicator light circuit connection there are two series aiding connection the
Two schmitt inverters；The fault-signal output end of the photoelectric converter is connected to the input of second schmitt inverter
End.
Preferably, further include the second indicator light circuit of designation date transmission direction；Second indicator light circuit connects
It is connected to the output end of first schmitt inverter.
Preferably, there are two the thirds of series aiding connection to apply for connection between the photoelectric converter and differential level converter
Close spy's phase inverter, the transmission input terminal of the photoelectric converter are connected to the output end of the third schmitt inverter.
Preferably, further include double copies power-supply system；The double copies power-supply system includes the industrial DC24V electricity of two-way
Source input circuit, 5V switch power supply systems and the confession photoelectric converter TTL for the work of peripheral Profibus-DP signal ports
The 5V isolated power supply systems of level signal port working are led between the 5V switch power supply systems and the 5V isolated power supplies system
Cross the connection of DC-DC isolators.
The present invention includes at least following advantageous effect：
1) differential level converter is connected to photoelectric converter to receive and dispatch Transistor-Transistor Logic level signal in the present invention；Differential electrical flat turn
Parallel operation is connected to the first schmitt inverter output end to obtain transmitting-receiving control sequential logical signal；Differential level converter exports
End is connected with Profibus-DP buses to receive and dispatch Profibus-DP differential signals；Photoelectric converter converts optical signals into TTL
Level signal, three state buffer, delay circuit, the first schmitt inverter carry out Transistor-Transistor Logic level signal the logic of data transmit-receive
Control；Transistor-Transistor Logic level signal is converted to Profibus-DP differential signals by electrical isolation and differential signal conversion circuit；Deferred telegram
Road is vibrated for preventing, and realizes that two states of transmitting-receiving of differential level converter can reliably switch, that improves signal transmission can
By property；
2) the invention also includes the first indicator light circuit of fault alarm, the first indicator light circuit is connected to photoelectric converter
Fault-signal output end, realize failure warning；
3) the invention also includes the second indicator light circuit of designation date transmission direction, the second indicator light circuit is connected to
The output end of one schmitt inverter realizes the instruction of data transfer direction；
4) the invention also includes double copies power-supply systems comprising industrial DC24V power supply input circuits of two-way, for periphery
The 5V switch power supply systems of Profibus-DP signal ports work and the 5V to work for photoelectric converter Transistor-Transistor Logic level signal port
Isolated power supply system is connected between 5V switch power supply systems and 5V isolated power supply systems by DC-DC isolators；5V Switching Power Supplies
System and 5V isolated power supply systems access simultaneously, wherein all the way input power failure when another way input power continue safeguards system
Normal work, improve system power supply reliability.
Part is illustrated to embody by further advantage, target and the feature of the present invention by following, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Description of the drawings
Fig. 1 is the schematic diagram of Profibus-DP photoelectric signal transformations system of the present invention；
Fig. 2 (a) is the vertical view that the pin function of photoelectric converter of the present invention is distributed；Fig. 2 (b) is institute of the present invention
The peripheral circuit wiring diagram for the photoelectric converter stated；
Fig. 3 is the company of data transmit-receive logic control circuit and electrical isolation and differential signal conversion circuit of the present invention
Connect schematic diagram；
Fig. 4 (a) is the 5V switch power supply systems signal of periphery Profibus-DP signal ports of the present invention work
Figure；Fig. 4 (b) is the 5V isolated power supply system schematics of photoelectric converter Transistor-Transistor Logic level signal port of the present invention work.
Specific implementation mode
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art with reference to specification text
Word can be implemented according to this.
It should be appreciated that such as " having ", "comprising" and " comprising " term used herein are not precluded one or more
The presence or addition of a other elements or combinations thereof.
The present invention provides a kind of Profibus-DP photoelectric signal transformations system, as shown in figures 1 and 3 comprising：
Photoelectric converter 10 receives optical signal and converts thereof into Transistor-Transistor Logic level signal or receive Transistor-Transistor Logic level signal and incite somebody to action
It is converted into optical signal；
Data transmit-receive logic control circuit 20 comprising be connected to the three state buffer of photoelectric converter 10, Three-State
Device is connected with delay circuit and the first schmitt inverter in turn；
Electrical isolation and differential signal conversion circuit 30 comprising differential level converter, the connection of differential level converter
To photoelectric converter 10 to receive and dispatch Transistor-Transistor Logic level signal；Differential level converter be connected to the first schmitt inverter output end with
Obtain transmitting-receiving control sequential logical signal；Differential level converter output end is connected with Profibus-DP buses to receive and dispatch
Profibus-DP differential signals.
In the above embodiment, photoelectric converter 10 is using technical grade optical-electric module OCM2352.Such as Fig. 2 (a) to Fig. 2 (b)
Shown, technical grade optical-electric module OCM2352 realizes the transmission of optical signal, operation wavelength 1310nm, transmission using multimode double-fiber
0~2Mb/s of rate, this end module light transmitting terminal (receiving terminal) pass through more with the optical receiving end (transmitting terminal) for communicating another end module
Mode fiber connects, and physical connection mode has the interfaces such as SC, ST, FC optional.As the preferred embodiment of the above embodiment, deferred telegram
Road includes the pull-up resistor R7 being sequentially connected in series, diode D6 in parallel and resistance R16, capacitance C21, resistance R7 and two poles in parallel
Pipe D6 and resistance R16 forms charge-discharge circuit to capacitance C21 charge and discharge.The acp chip of differential level converter be preferably magnetic every
From TTL- differential signal conversion chip ADM2486 chips, there is Traditional photovoltaic isolation in everyways such as performance, power consumption, volumes
The incomparable advantage of device (optocoupler), power consumption are only the 1/6~1/10 of photoelectrical coupler, are had than photoelectrical coupler higher
Message transmission rate, time sequence precision and transient state common mode inhibition capacity；4 feet and 5 feet of ADM2486 chips connect together conduct
Control terminal RTS is received and dispatched, TxD the and RxD signals of Transistor-Transistor Logic level port are connected with the RD of photoelectric converter 10 and TD respectively, difference letter
Number A, B are connected according to Profibus-DP physical layer protocol, that is, pass through resistance R2 matchings and the resistance R1 of two 390 Ω of 220 Ω
After pull-up and resistance R3 drop-downs, A, B signal are respectively connected to the 3 of Profibus-DP connectors, 8 two ports.Three state buffer is preferred
For 74HC125 chips.Photoelectric converter 10 by after the optical signal demodulation inputted from optical receiving end in the form of Transistor-Transistor Logic level from 2 feet
(RD) output is to signal logic processing and level translation part is received, and the Transistor-Transistor Logic level signal of level translation part output is by module 8
Foot (TD) inputs.Differential level converter is connected to photoelectric converter 10 to receive and dispatch Transistor-Transistor Logic level signal；Differential level converter connects
The first schmitt inverter output end is connected to obtain transmitting-receiving control sequential logical signal；Differential level converter output end connects
There are Profibus-DP buses to receive and dispatch Profibus-DP differential signals；Photoelectric converter 10 converts optical signals into Transistor-Transistor Logic level
Signal, three state buffer, delay circuit, the first schmitt inverter carry out Transistor-Transistor Logic level signal the logic control of data transmit-receive；
Transistor-Transistor Logic level signal is converted to Profibus-DP differential signals by electrical isolation and differential signal conversion circuit 30；Delay circuit is used
In preventing to vibrate, realizes that two states of transmitting-receiving of differential level converter can reliably switch, improve the reliability of signal transmission.
As another embodiment of the invention, Profibus-DP photoelectric signal transformations system provided by the invention is also
The first indicator light circuit DM1, the first indicator light circuit DM1 including fault alarm is connected to the fault-signal of photoelectric converter 10
Output end (ends SD).Specifically, photoelectric converter 10 by the digital signal of input it is optically modulated after sent by light transmitting terminal,
The 4th foot (ends SD) of photoelectric converter 10 exports transmission fault information, the pin output low level letter when transmission link failure
Number, which can provide the sound-light alarm of optical signal transmission failure by troubleshooting and the first indicator light circuit DM1 for the external world
Signal.
As a kind of specific embodiment of the above embodiment, photoelectric converter 10 and the first indicator light circuit DM1
Between connection there are two series aiding connection the second schmitt inverter (U5E, U5B are followed successively by figure)；The event of photoelectric converter 10
The ends barrier signal output end SD are connected to the input terminal of U5E in the second schmitt inverter.
As another embodiment of the invention, Profibus-DP photoelectric signal transformations system provided by the invention is also
The second indicator light circuit DM2 including designation date transmission direction；Second indicator light circuit DM2 is connected to first Schmidt's reverse phase
The output end of device realizes the instruction of data transfer direction.
As another embodiment of the invention, the first Transistor-Transistor Logic level port (ends RxD) of differential level converter connects
It is connected to photoelectricity to the second Transistor-Transistor Logic level port (ends TxD) of the transmitting terminal (ends TD) of photoelectric converter 10, differential level converter
The receiving terminal (ends RD) of converter 10；The transmitting-receiving control terminal (ends RTS) of differential level converter passes sequentially through two series aiding connections
The intermediate ends of the first schmitt inverter, delay circuit be connected to the transmitting-receiving control terminal (ends Y4) of three state buffer.Specifically,
First schmitt inverter of two series aiding connections is U5D and U5C respectively successively, and the second indicator light circuit DM2 is connected to first
The output end of U5C in schmitt inverter.When photoelectric converter 10 is in optical signal reception state, the TTL of the ends RD output
Level signal is directly inputted to the transmission input terminal of differential level converter, while the signal is introduced three state buffer, photoelectricity
The Transistor-Transistor Logic level signal that its end RD exports is directly inputted to the ports transmission input terminal RxD of differential level converter by converter 10,
The ports A4 that the signal is introduced to three state buffer simultaneously, the transmitting-receiving control sequential logic for generating differential level converter are believed
Number, the signal exported by the ends Y4 of three state buffer is formed by resistance R7, light emitting diode D6, resistance R16, capacitance C12
After charge and discharge electric network, and the transmitting-receiving for being output to after the reverse phase of a first schmitt inverter U5D differential level converter is patrolled
Collect the ends control terminal RTS so that the ports RTS of difference level translator are rapidly gone to when photoelectric converter 10 receives low level
High level is sent out to make the TTL low level signals that photoelectric converter 10 receives be converted to difference low signal (VA-VB ＜ 0V)
Be sent in Profibus-DP buses, and when photoelectric converter 10 receives high level signal difference level translator the ends RTS
Become low level after delay about 500ns, differential level converter is in reception state, high letter is kept in Profibus-DP buses
Number (VA-VB ＜ 0V) state, Profibus-DP bus receiving terminals can receive high level, and system simultaneously converts differential level
The signal at the ends RTS of device drives the second indicator light circuit DM2 after a first schmitt inverter U5C reverse phase, for referring to
The transmission direction of registration evidence is by optical signal to be converted to Profibus-DP electric signals, at this point, the second indicator light circuit DM2
LED1 lamps are set as yellow.
When photoelectricity walk around device 10 be in optical signal and send state when, the ends RD are constantly in high level, differential level conversion
The direction controlling end ends RTS of device keep low level, differential level converter to be in reception state, to which Profibus-DP is total
Differential signal VA-VB on line is converted to Transistor-Transistor Logic level signal, and two are connected between photoelectric converter 10 and differential level converter
The third schmitt inverter (being followed successively by U5A, U5F) of a series aiding connection, the ends the transmission input terminal TD connection of photoelectric converter 10
To the output end of U5F in third schmitt inverter, then the signal of the ends the RxD output of differential level converter is by two strings
It is sent from the ends TD of photoelectric converter 10 after the third schmitt inverter shaping of connection, while by the signal at the ends TD by the
The second indicator light circuit DM2, the transmission direction for being used to indicate data is driven to serve as reasons after the reverse phase of one schmitt inverter
Profibus-DP electric signals are converted to optical signal, and the LED2 lamps of the second indicator light circuit DM2 are set as green at this time.Photoelectricity turns
The failure alarm signal of parallel operation 10 inputs tri-state from the ends SD after the close special inverters of the U5E in the second schmitt inverter
The control terminal OE2 and OE4 of buffer 74HC125, using driving the second indicator light circuit after the first schmitt inverter reverse phase
DM2 locks reiving/transmitting state in failure for photoelectric converter 10 and receives and dispatches indicator light and provide alarm failure instruction, at this point,
The LED2 lamps of second indicator light circuit DM1 are set as red.
As another embodiment of the invention, Profibus-DP photoelectric signal transformations system provided by the invention is also
Including double copies power-supply system 40.Double copies power-supply system 40 includes the industrial DC24V power supply input circuits of two-way, for periphery
The 5V switch power supply systems of Profibus-DP signal ports work and the 5V to work for photoelectric converter Transistor-Transistor Logic level signal port
Isolated power supply system is connected between 5V switch power supply systems and 5V isolated power supply systems by DC-DC isolators.Such as Fig. 4 (a) and
Shown in Fig. 4 (b), two industrial instruments are accessed by the both ends V1+ and V2+ respectively with 24V power positive ends, and power supply negative terminal is attempted by
V-, and the ends Vin of switching power manager LM2596 are input to after common mode inductance and capacitor filtering, by LM2596 and phase
After the BUCK network transformations for closing device composition, 5V Switching Power Supplies are obtained, supply the work electricity of periphery Profibus-DP signal ports
Source, and the power supply is exported into a power supply VCC being isolated (voltage value is still 5V) after the DC-DC conversion modules of a 1W and is supplied
To internal system, the i.e. working power of photoelectric converter 10 and Transistor-Transistor Logic level signal port, realize that two-way power supply accesses simultaneously, and
And when input power failure all the way, another way input power continues the normal work of safeguards system, and it is reliable to improve system power supply
Property.The ADM2486 chips of differential level converter use the 5V power supplys of two isolation, the two to be isolated by a DC-DC module,
Transistor-Transistor Logic level part is used to work the same power supply with photoelectric converter 10, and differential signal port power is by internal switch electricity
Source converter is by the 24V power conversions of input.In order to realize overcurrent, the overvoltage protection at differential electric signal end, pressure can access
Quick resistance and TVS diode.
As another embodiment of the invention, filtered electrical is equipped between 5V isolated power supplies system and photoelectric converter 10
Road, filter circuit include capacitance C15, capacitance C16, capacitance C17, capacitance C18, inductance L3 and inductance L4；Capacitance C15 and capacitance
In parallel with inductance L3 after C16 series connection, the first common end in parallel is connected to 5V isolated power supplies, and the second common end in parallel is connected to
The indirect reference ground of the power input VCC_T of photoelectric converter 10, capacitance C15 and capacitance C16.Capacitance C17 and capacitance C18 strings
In parallel with inductance L4 after connection, the first common end in parallel is connected to 5V isolated power supplies, and the second common end in parallel is connected to photoelectricity
The indirect reference ground of the power input VCC_R of converter 10, capacitance C17 and capacitance C18.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With.It can be applied to various suitable the field of the invention completely.It for those skilled in the art can be easily
Realize other modification.Therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (6)
1. a kind of Profibus-DP photoelectric signal transformations system, which is characterized in that including：
Photoelectric converter receives optical signal and converts thereof into Transistor-Transistor Logic level signal or receive Transistor-Transistor Logic level signal and be converted
At optical signal；
Data transmit-receive logic control circuit comprising be connected to the three state buffer of the photoelectric converter, the Three-State
Device is connected with delay circuit and the first schmitt inverter in turn；
Electrical isolation and differential signal conversion circuit comprising differential level converter, the differential level converter are connected to
The photoelectric converter is to receive and dispatch Transistor-Transistor Logic level signal；The differential level converter is connected to first schmitt inverter
Output end is to obtain transmitting-receiving switching control sequential logic signal；The differential level converter output end is connected with Profibus-
DP buses are to receive and dispatch Profibus-DP differential signals；
First Transistor-Transistor Logic level port of the differential level converter is connected to the transmitting terminal of the photoelectric converter, the difference
Second Transistor-Transistor Logic level port of level translator is connected to the receiving terminal of the photoelectric converter；The differential level converter
Transmitting-receiving control terminal passes sequentially through the intermediate ends of first schmitt inverter of two series aiding connections, delay circuit connection
To the three state buffer.
2. Profibus-DP photoelectric signal transformations system as described in claim 1, which is characterized in that further include fault alarm
The first indicator light circuit, first indicator light circuit is connected to the fault-signal output end of the photoelectric converter.
3. Profibus-DP photoelectric signal transformations system as claimed in claim 2, which is characterized in that the photoelectric converter
There are two the second schmitt inverters of series aiding connection for connection between first indicator light circuit；The photoelectric converter
Fault-signal output end is connected to the input terminal of second schmitt inverter.
4. Profibus-DP photoelectric signal transformations system as described in claim 1, which is characterized in that further include designation date
Second indicator light circuit of transmission direction；Second indicator light circuit is connected to the output of first schmitt inverter
End.
5. Profibus-DP photoelectric signal transformations system as described in claim 1, which is characterized in that the photoelectric converter
There are two the third schmitt inverter of series aiding connection, the transmissions of the photoelectric converter for connection between differential level converter
Input terminal is connected to the output end of the third schmitt inverter.
6. the Profibus-DP photoelectric signal transformation systems as described in any one of claim 1-5, which is characterized in that also wrap
Include double copies power-supply system；
The double copies power-supply system includes the industrial DC24V power supply input circuits of two-way, for peripheral Profibus-DP signal ends
The 5V switch power supply systems of mouth work and the 5V isolated power supply systems to work for the photoelectric converter Transistor-Transistor Logic level signal port,
It is connected by DC-DC isolators between the 5V switch power supply systems and the 5V isolated power supplies system.
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| CN106506080B (en) * | 2016-10-10 | 2019-07-23 | 中广核工程有限公司 | A kind of field bus system and method based on nuclear power station water supply system |
| CN107229589B (en) * | 2017-06-21 | 2024-03-12 | 上海景格信息科技有限公司 | TTL communication bus sub-module expansion circuit |
| CN107566042B (en) * | 2017-08-28 | 2019-12-13 | 北京卓越信通电子股份有限公司 | implementation method of PROFIBUS redundant looped network optical fiber transceiver |
| CN109450549A (en) * | 2018-11-26 | 2019-03-08 | 中国人民解放军陆军工程大学 | Photoelectric conversion device and communication system |
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