CN114844954B - Transmission protocol conversion method and device - Google Patents
Transmission protocol conversion method and device Download PDFInfo
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- CN114844954B CN114844954B CN202110055112.7A CN202110055112A CN114844954B CN 114844954 B CN114844954 B CN 114844954B CN 202110055112 A CN202110055112 A CN 202110055112A CN 114844954 B CN114844954 B CN 114844954B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 10
- 230000008520 organization Effects 0.000 claims abstract description 4
- 230000003287 optical effect Effects 0.000 claims description 12
- 238000001816 cooling Methods 0.000 abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 12
- 230000003993 interaction Effects 0.000 abstract description 5
- 230000017525 heat dissipation Effects 0.000 description 20
- 230000008569 process Effects 0.000 description 8
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 241000883990 Flabellum Species 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
Abstract
The invention relates to the technical field of power equipment, in particular to a transmission protocol conversion method, which comprises an upper computer, UDP messages, an Ethernet PHY, an RGMII interface, an FPGA, a channel and stabilizing and controlling devices, wherein the FPGA comprises an MAC controller, a message organization module and an FT3 coding and decoding module, and FT3 messages sent by a plurality of stabilizing and controlling devices are packaged into one UDP message and then sent to the upper computer through a network self-adaptive electric port; the invention uses a plurality of stability control devices to connect the upper computer, each module works independently and operates in parallel, and can automatically adapt to various FT3 transmission rates, thereby realizing the data conversion between multiple paths of FT3 and UDP and conveniently realizing the data interaction between the upper computer and the stability control devices; the motor is utilized to drive the fan impeller to blow wind, and the wind passes through the cooling of cold water in the cooling box, so that the temperature of the air can be reduced, and the low-temperature air can quickly absorb heat after entering the inside of the shell, thereby accelerating the cooling.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a transmission protocol conversion method and device.
Background
FT3 is a link layer transmission frame format specified in the IEC60044-8 electronic current transformer standard, defined by the International Electrotechnical Commission (IEC). The electronic transformer is specified in IEC60044-8 to mainly comprise two parts, namely a high-voltage side data FT3 protocol conversion device conversion module and a low-voltage side Merging Unit (MU), wherein FT3 frames are adopted for data transmission between the two parts. The FT3 is mainly applied to the intelligent transformer substation in the aspects of interaction between the electronic transformer and the merging unit MU, interaction between the merging unit MU and protection, measurement and control, cascading among the merging units and the like. The frame format has the advantages of fixed delay and capability of carrying out multipoint synchronous data link in high-speed data processing.
The communication interface of the stabilizing device in the high-voltage direct current adopts the frame format of FT3, when the FT3 is applied to an intelligent substation, the fixed-length frame format is adopted, the transmission delay is fixed, but only point-to-point transmission is supported, in the electric simulation application, a plurality of stabilizing devices are generally required to be connected for data acquisition and simulation control, in the interconnection of an upper computer and the stabilizing devices, protocol conversion is required to be carried out on the FT3 transmission, the data of the plurality of stabilizing devices are extracted, and the heat dissipation of the FT3 mostly depends on the fan inside the equipment, the wind blown to the inside is natural wind, the temperature is higher, the heat dissipation cannot be further reduced, and the heat dissipation is influenced.
SUMMARY OF THE PATENT FOR INVENTION
The invention aims to provide a transmission protocol conversion method and a transmission protocol conversion device, which solve the problems that only point-to-point transmission is supported, a plurality of stability control devices are generally required to be connected for data acquisition and simulation control in electric power simulation application, protocol conversion is required to be carried out on FT3 transmission in interconnection of an upper computer and the stability control devices, data of the plurality of stability control devices are extracted, and heat dissipation of the device mostly depends on fans in the device, and wind blown inwards is natural wind, so that the temperature is higher, the further reduction cannot be realized, and the heat dissipation is influenced.
In order to achieve the above purpose, the present invention provides the following technical solutions: a transmission protocol conversion method comprises an upper computer, UDP messages, an Ethernet PHY, an RGMII interface, an FPGA, a channel and a stabilizing device, wherein the FPGA comprises an MAC controller, a message organization module and an FT3 coding and decoding module, the FT3 messages sent by the stabilizing devices are packed into one UDP message, and then the UDP message is sent to the upper computer through a network self-adaptive electrical port; the UDP messages issued by the upper computer are unpacked, effective information in the UDP messages is extracted, the UDP messages are divided into a plurality of FT3 messages, the FT3 messages are respectively issued to a plurality of stability control devices, the FPGA synchronously encodes and decodes the FT3 messages, the multiple channels are not interfered with each other, and the channels run independently of each other;
after receiving the FT3 message, the FPGA firstly carries out Manchester decoding on the FT3 message, then analyzes the FT3 message according to a protocol and carries out CRC check, valid data in the FT3 message is cached after the FT3 message passes the check, when the FPGA is communicated with an upper computer, cache data of a plurality of channels are selected according to configuration, and the data are packaged into a UDP packet to be sent to the upper computer;
after receiving the UDP packet issued by the upper computer, the FPGA sends FT3 effective data to be sent into a sending buffer area of each channel according to the channel number in the data packet, and according to the sending interval, the data in the sending buffer area is sent out by Manchester encoding according to the frame format of FT3, and when the FPGA does not receive the UDP packet issued by the upper computer any more, the FPGA circularly sends the data in the buffer area according to the last sending interval.
Preferably, the FT3 encoding and decoding module comprises an FT3 encoding module and an FT3 decoding module, and the sending directions of the FT3 encoding module and the FT3 decoding module are opposite.
Preferably, the FT3 sending and receiving are implemented by a standard optical serial device, which includes a channel 1 optical port up to a channel N optical port.
Preferably, the sending and receiving of the FT3 message can select different sending and receiving intervals through the configuration issued by the upper computer.
Preferably, when decoding the FT3 message, the FPGA uses a high-speed clock to calculate the pulse width of the received manchester code element, so as to automatically adapt to different FT3 transmission rates.
Preferably, when the FPGA encodes FT3, the same transmission rate as the corresponding reception channel is used.
The utility model provides a transmission protocol conversion device, includes shell and protocol conversion circuit board, the inside at the shell is installed to the protocol conversion circuit board, the thermovent has all been seted up to the both sides of shell, the right side joint of shell has the linking frame, the right side fixed mounting of linking frame has the motor, the output of motor runs through linking frame left hole and fixed the cup joint the flabellum wheel, the right side joint of linking frame has the cooling tank, the left middle-end of cooling tank is the indent structure, the motor is arranged in the indent of cooling tank, the inside of cooling tank runs through and is provided with the cooling tube, the left end intercommunication of cooling tube has the connecting pipe, the hole on linking frame right side is gone into to the left end card of connecting pipe and with the inside intercommunication of linking frame.
Preferably, the top intercommunication of cooling tank has the water injection pipe, the bottom intercommunication of cooling tank has the drain pipe, the equal threaded connection of top and the bottom of drain pipe of water injection pipe has sealed lid.
Preferably, a heat dissipation plate is clamped in the heat dissipation opening on the right side of the shell, and two sides of the heat dissipation plate correspond to the protocol conversion circuit board and the fan blade wheel respectively.
Preferably, the left side joint of shell has the heat dissipation net, the right side bolt of cooler bin has the dustcoat, the left side of dustcoat and the right-hand member intercommunication of cooling tube, the connection frame passes through the thermovent and communicates with the shell.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention uses a plurality of stable control devices to connect the upper computer, extracts effective information therein, and divides the effective information into a plurality of FT3 messages, so that the multiple channels are not interfered with each other and run independently, the invention is completed based on the FPGA, each module works independently and runs in parallel, and can be automatically adapted to various FT3 transmission rates, thereby realizing data conversion between multiple channels of FT3 and UDP and facilitating data interaction between the upper computer and the stable control devices;
2. according to the invention, the fan impeller is driven by the motor to blow the wind, and the wind passes through the cooling of cold water in the cooling box, so that the temperature of the air can be reduced, and the air with low temperature can absorb heat rapidly after entering the inside of the shell, thereby accelerating the cooling.
Drawings
FIG. 1 is a schematic diagram of the operation flow of the structure of the present invention;
FIG. 2 is a schematic diagram of the receiving process of FT3 according to the present invention;
FIG. 3 is a schematic diagram of the transmission process of FT3 according to the present invention;
FIG. 4 is a schematic diagram of the structure of the present invention;
FIG. 5 is a schematic view showing the connection frame and the cooling box of the present invention.
In the figure: 1. a housing; 2. a protocol conversion circuit board; 3. a heat radiation port; 4. a connection frame; 5. a motor; 6. a fan impeller; 7. a cooling box; 8. a cooling tube; 9. a connecting pipe; 10. a water injection pipe; 11. a drain pipe; 12. a heat dissipation plate; 13. a heat dissipation net; 14. and (3) a housing.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present invention. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the inventor, are within the scope of the invention.
Referring to fig. 1-5, a transmission protocol conversion method includes an upper computer, UDP messages, an ethernet PHY, an RGMII interface, an FPGA, a channel, and a stability control device, where the FPGA includes a MAC controller, a message organization module, and an FT3 encoding and decoding module, and the FT3 messages sent by the stability control devices are packaged into a UDP message, and then sent to the upper computer through a network adaptive electrical port; the UDP messages issued by the upper computer are unpacked, effective information in the UDP messages is extracted, the UDP messages are divided into a plurality of FT3 messages, the FT3 messages are respectively issued to a plurality of stability control devices, the FPGA synchronously encodes and decodes the FT3 messages, the multiple channels are not interfered with each other, and the channels run independently of each other;
after receiving the FT3 message, the FPGA firstly carries out Manchester decoding on the FT3 message, then analyzes the FT3 message according to a protocol and carries out CRC check, valid data in the FT3 message is cached after the FT3 message passes the check, when the FPGA is communicated with an upper computer, cache data of a plurality of channels are selected according to configuration, and the data are packaged into a UDP packet to be sent to the upper computer;
after receiving the UDP packet issued by the upper computer, the FPGA sends FT3 effective data to be sent into a sending buffer area of each channel according to the channel number in the data packet, and the data in the sending buffer area is sent out in Manchester encoding according to the frame format of FT3 according to the sending interval, when the FPGA does not receive the UDP packet issued by the upper computer any more, the FPGA circularly sends the data in the buffer area according to the last sending interval, and the upper computer is connected by a plurality of stability control devices, extracts effective information in the data packet and divides the data packet into a plurality of FT3 messages, so that the channels do not interfere with each other, independently operate based on the FPGA, each module independently operates and is parallel, and can automatically adapt to various FT3 transmission rates, thereby realizing data conversion between multiple channels FT3 and UDP and conveniently realizing data interaction between the upper computer and the stability control devices.
In this embodiment, the FT3 encoding and decoding module includes an FT3 encoding module and an FT3 decoding module, where the transmitting directions of the FT3 encoding module and the FT3 decoding module are opposite, the FT3 encoding module may encode when transmitting information, so that the FT3 encoding module is convenient for the next procedure to process and receive information, and also is convenient for receiving information of the last procedure, and the FT3 decoding module is convenient for receiving information transmitted by the last procedure to process, and may decode the information, and then transmit the decoded information to the next procedure.
In this embodiment, the FT3 sending and receiving are implemented through a standard optical serial device, where the standard optical serial device includes a channel 1 optical port, up to a channel N optical port, and may connect an upper process and a lower process, so that normal operation of the upper process and the lower process may be ensured, and operation of the device is convenient.
In this embodiment, the sending and receiving of the FT3 packet may be configured by the host computer, and different sending and receiving intervals may be selected, so that smooth sending and receiving of information may be ensured, and information blocking may be avoided, thereby affecting operation of the device.
In this embodiment, when the FPGA decodes the FT3 packet, the high-speed clock is used to calculate the pulse width of the received manchester symbol, so as to automatically adapt to different FT3 transmission rates, and thus, the FPGA can adapt to different FT3 transmission rates in time, ensure the utilization rate of the device operation, and reduce unnecessary waste.
In this embodiment, when the FPGA encodes FT3, the same transmission rate as the corresponding receiving channel is used, so that the same transmission rate of the receiving channel can be used, the operating utilization rate of the device is ensured, and unnecessary waste is reduced.
The utility model provides a transmission protocol conversion device, including shell 1 and protocol conversion circuit board 2, protocol conversion circuit board 2 installs in the inside of shell 1, the thermovent 3 has all been seted up to the both sides of shell 1, the right side joint of shell 1 has connecting frame 4, connecting frame 4's right side fixed mounting has motor 5, the output of motor 5 runs through connecting frame 4 left hole and fixed the cup joint flabellum wheel 6, connecting frame 4's right side joint has cooling box 7, cooling box 7 left middle-end is the indent structure, motor 5 is arranged in cooling box 7's indent, cooling box 7's inside runs through and is provided with cooling tube 8, cooling tube 8's left end intercommunication has connecting pipe 9, connecting pipe 9's left end card is gone into connecting frame 4 right hole and is linked together with connecting frame 4's inside, utilize motor 5 to drive impeller 6 to blow the wind, the cooling of the inside cold water of cooling box 7 of wind through the cooling, just so can reduce the temperature of air, can be fast after letting the inside of low temperature air entering shell 1, thereby the cooling down.
In this embodiment, the top intercommunication of cooling box 7 has water injection pipe 10, and the bottom intercommunication of cooling box 7 has drain pipe 11, and the equal threaded connection in top of water injection pipe 10 and drain pipe 11's bottom has sealed lid, and water injection pipe 10 can be used for injecting cold water to the inside of cooling box 7, can utilize cold water to absorb the heat of cooling pipe 8 inside air, conveniently dispels the heat, and drain pipe 11 can discharge the cooling water after the intensification to in time ensure that cooling box 7 inside temperature is lower to guarantee the radiating effect of device operation.
In this embodiment, the heat dissipation opening 3 on the right side of the housing 1 is clamped with the heat dissipation plate 12, two sides of the heat dissipation plate 12 respectively correspond to the protocol conversion circuit board 2 and the fan blade wheel 6, the heat dissipation plate 12 can filter the cooled air, remove impurities in the air, and prevent the impurities from affecting the protocol conversion circuit board 2 after entering the housing 1.
In this embodiment, the left side joint of shell 1 has heat dissipation net 13, and the right side bolt of cooler bin 7 has dustcoat 14, and the left side of dustcoat 14 communicates with the right-hand member of cooling tube 8, and connecting frame 4 communicates with shell 1 through thermovent 3, and thermovent 3 on the left side of shell 1 can be plugged up to heat dissipation net 13, can prevent that impurity in the air from getting into shell 1 when guaranteeing thermovent 3 unobstructed.
Working principle: the specific function realized by the device is protocol conversion, FT3 messages sent by a plurality of stability control devices are packed into a UDP message, and the UDP message is sent to an upper computer through a hundred megabits/kilomega self-adaptive electric port; unpacking the UDP messages issued by the upper computer, extracting effective information from the UDP messages, dividing the effective information into a plurality of FT3 messages, respectively issuing the FT3 messages to a plurality of stability control devices, synchronously encoding and decoding the FT3 messages by the FPGA, and independently running the FT3 messages without mutual interference among multiple channels; FT3 sending and receiving are realized through standard optical serial devices; the sending and receiving of the FT3 message can be configured by the upper computer, and different sending and receiving intervals are selected; when decoding the FT3 message, the FPGA uses a high-speed clock to calculate the pulse width of the received Manchester code element, and is automatically adapted to different FT3 transmission rates; when the FPGA codes FT3, the same transmission rate as the corresponding receiving channel is used; after receiving the FT3 message, the FPGA firstly carries out Manchester decoding on the FT3 message, then analyzes the FT3 message according to a protocol and carries out CRC check, valid data in the FT3 message is cached after the FT3 message passes the check, when the FPGA is communicated with an upper computer, cache data of a plurality of channels are selected according to configuration, and the data are packaged into a UDP packet to be sent to the upper computer; after receiving the UDP packet issued by the upper computer, the FPGA sends FT3 effective data to be sent into a sending buffer area of each channel according to the channel number in the data packet, and according to the sending interval, the data in the sending buffer area is sent out by Manchester encoding according to the frame format of FT3, and when the FPGA does not receive the UDP packet issued by the upper computer any more, the FPGA circularly sends the data in the buffer area according to the last sending interval.
When heat dissipation is needed, cooling water is led into the cooling box 7 through the water injection pipe 10, the motor 5 is started, the motor 5 drives the fan impeller 6 to rotate, the fan impeller 6 which rotates rapidly generates air pressure wind force, air is led into the connecting frame 4 through the outer cover 14, the cooling pipe 8 and the connecting pipe 9 in sequence, the air entering the cooling pipe 8 is increased by utilizing the fine cooling pipe 8 to increase the contact surface with the cooling water, the cooling water can start to absorb heat in the air, the temperature of the air is reduced, the cooled air enters the shell 1 through the connecting frame 4 and the heat dissipation opening 3, then heat generated in the operation process of the protocol conversion circuit board 2 is absorbed, and the air absorbing the heat is discharged through the heat dissipation opening 3 on the left side of the shell 1.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A transmission protocol conversion method, characterized in that: the system comprises an upper computer, UDP messages, an Ethernet PHY, an RGMII interface, an FPGA, a channel and a stabilizing device, wherein the FPGA comprises an MAC controller, a message organization module and an FT3 coding and decoding module, and the FT3 messages sent by the stabilizing devices are packaged into one UDP message and then sent to the upper computer through a network self-adaptive electric port; the UDP messages issued by the upper computer are unpacked, effective information in the UDP messages is extracted, the UDP messages are divided into a plurality of FT3 messages, the FT3 messages are respectively issued to a plurality of stability control devices, the FPGA synchronously encodes and decodes the FT3 messages, the multiple channels are not interfered with each other, and the channels run independently of each other;
after receiving the FT3 message, the FPGA firstly carries out Manchester decoding on the FT3 message, then analyzes the FT3 message according to a protocol and carries out CRC check, valid data in the FT3 message is cached after the FT3 message passes the check, when the FPGA is communicated with an upper computer, cache data of a plurality of channels are selected according to configuration, and the data are packaged into a UDP packet to be sent to the upper computer;
after receiving the UDP packet issued by the upper computer, the FPGA sends FT3 effective data to be sent into a sending buffer area of each channel according to the channel number in the data packet, and according to the sending interval, the data in the sending buffer area is sent out by Manchester encoding according to the frame format of FT3, and when the FPGA does not receive the UDP packet issued by the upper computer any more, the FPGA circularly sends the data in the buffer area according to the last sending interval.
2. A transmission protocol conversion method according to claim 1, wherein: the FT3 coding and decoding module comprises a FT3 coding module and a FT3 decoding module, and the sending directions of the FT3 coding module and the FT3 decoding module are opposite.
3. A transmission protocol conversion method according to claim 1, wherein: the FT3 sending and receiving are realized through a standard optical serial device, wherein the standard optical serial device comprises a channel 1 optical port and a channel N optical port.
4. A transmission protocol conversion method according to claim 1, wherein: the sending and receiving of the FT3 message can be configured by the upper computer, and different sending and receiving intervals can be selected.
5. A transmission protocol conversion method according to claim 1, wherein: when decoding the FT3 message, the FPGA uses a high-speed clock to calculate the pulse width of the received Manchester code element, and is automatically adapted to different FT3 transmission rates.
6. A transmission protocol conversion method according to claim 1, wherein: when the FPGA codes FT3, the same transmission rate as the corresponding receiving channel is used.
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| CN202110055112.7A CN114844954B (en) | 2021-01-15 | 2021-01-15 | Transmission protocol conversion method and device |
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| CN202110055112.7A CN114844954B (en) | 2021-01-15 | 2021-01-15 | Transmission protocol conversion method and device |
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| CN102608450A (en) * | 2012-02-24 | 2012-07-25 | 江苏凌创电气自动化股份有限公司 | Testing and verifying system appropriate for intelligent transformer substation and verifying method |
| CN103837854A (en) * | 2014-02-20 | 2014-06-04 | 国家电网公司 | Digital electric energy meter calibration device based on FT3 interface |
| CN105610545A (en) * | 2015-12-21 | 2016-05-25 | 中国西电电气股份有限公司 | FT3 self-adaptive decoding system and method based on FPGA |
| CN111693923A (en) * | 2020-04-28 | 2020-09-22 | 中国电力科学研究院有限公司 | FT3 protocol analysis device and method for verifying direct-current transformer and merging unit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108632896B (en) * | 2017-03-15 | 2020-09-29 | 华为技术有限公司 | Data transmission method and related equipment |
| CN210804292U (en) * | 2019-11-25 | 2020-06-19 | 广西千翔科技有限公司 | Big data server that radiating effect is good |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608450A (en) * | 2012-02-24 | 2012-07-25 | 江苏凌创电气自动化股份有限公司 | Testing and verifying system appropriate for intelligent transformer substation and verifying method |
| CN103837854A (en) * | 2014-02-20 | 2014-06-04 | 国家电网公司 | Digital electric energy meter calibration device based on FT3 interface |
| CN105610545A (en) * | 2015-12-21 | 2016-05-25 | 中国西电电气股份有限公司 | FT3 self-adaptive decoding system and method based on FPGA |
| CN111693923A (en) * | 2020-04-28 | 2020-09-22 | 中国电力科学研究院有限公司 | FT3 protocol analysis device and method for verifying direct-current transformer and merging unit |
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