CN104407591A - Communication management method for master station and slave station of Modbus device based on real-time database, and communication management system for master station and slave station of Modbus device based on real-time database - Google Patents
Communication management method for master station and slave station of Modbus device based on real-time database, and communication management system for master station and slave station of Modbus device based on real-time database Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/4185—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by the network communication
- G05B19/4186—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by the network communication by protocol, e.g. MAP, TOP
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention provides a communication management method for a master station and a slave station of a Modbus device based on a real-time database. The method provided by the invention has the advantages that valid data is stored through the real-time database so as to link up the conversion of different protocols, and the communication interconnection capability of the Modbus device is enhanced through the conversion of the three different protocols; signal integration of the process of the Modbus field device into a control station is achieved, and all the Modbus field device data is sent to an engineer station of a master control room; meanwhile, with the real-time database serving as a medium, and Modbus communication modules serving as carriers, other field device data signals accessing the control station can be open to a third-party system through a Modbus virtual device, so as to achieve open interconnection; a user in the control room can conveniently carry out remote view, modification and configuration of configuration information of the field device, and all the operations are recorded in the database, so as to be well documented, improve the maintenance rate and lower the production cost.
Description
Technical field
The present invention relates to industrial control system and device Modbus communication technique field, especially relate to a kind of Modbus equipment master-salve station communication management method and system based on real-time data base.
Background technology
Controller area network (Controller Area Network), belong to the category of fieldbus, a kind of serial communication network of effective support dcs, by company of German Bosch the eighties in 20th century be specially automobile industry develop a kind of serial communication bus.Due to the design of its high-performance, high reliability and uniqueness, and any mistake of generation can be detected, and more and more be subject to people's attention, be widely used in numerous areas.When signal transmission distance reaches 10km, CAN still can provide the message transmission rate up to 50kbit/s.Because CAN has very high real-time performance and range of application, the express network reaching as high as 1Mbps from bit rate can be arranged in pairs or groups arbitrarily to the multi 50Kbps network of low cost.Therefore, CAN is widely applied in the fields such as car industry, aircraft industry, Industry Control, security protection.
Modbus agreement is a kind of general purpose language be applied on electronic controller.By this agreement, controller each other, controller can communicate via between network (such as Ethernet) and miscellaneous equipment.It has become a current industry standard.Had it, the opertaing device that different vendor produces can be linked to be industrial network, carries out Centralized Monitoring.This protocol define a controller and can be familiar with the message structure used, and no matter they are through which kind of network carries out communicating.It is described that the process of a controller request access miscellaneous equipment, how to respond the request from miscellaneous equipment, and how to detect mistake and record.It has formulated the common format of message field general layout and content.When a Modbus network communication, this agreement determines the device address that each controller need know them, identifies the message sent by address, and which kind of action decision will produce.If need to respond, generation feedback information also sends by Modbus agreement by controller.On other networks, the message conversion containing Modbus agreement is the frame or pack arrangement that use over the network.This conversion also extends the method solving the location that saves land, routed path and error-detecting according to concrete network.This agreement supports traditional RS-232, RS-422, RS-485 and ethernet device.Many commercial units, comprise PLC, DCS, and intelligent instrument etc. are all using Modbus agreement as the communication standard between them.
Current Modbus equipment master-salve station communication management method is all the communication of Modbus equipment master-salve station one direction, a Modbus main website only allows and the communication of Modbus slave station, and information interaction can not be carried out with third party Modbus main website, can not opening and interconnecting be realized, thus cause information effectively can not share utilization.
Summary of the invention
In order to solve the problem, enable Modbus main website and third party Modbus main website carry out information interaction, realizing opening and interconnecting and information sharing, the invention provides following technical scheme:
Based on a Modbus equipment master-salve station communication management method for real-time data base, comprise the steps:
S1: slip-stick artist is by control engineering application software platform, and configuration Modbus facility information, is sent to control station by configuration info with the message form in industrial ethernet protocol;
S2: control station unpacks received industrial ethernet protocol message, is sent to Modbus module with the message form packing in CAN protocol after valid data being stored in control station real-time data base;
S3:Modbus module unpacks received CAN protocol message, forms Modbus agreement request frame form and be sent to corresponding Modbus slave station after valid data being stored in Modbus module database;
Response message is returned to Modbus module after receiving Modbus agreement request frame by S4:Modbus slave station, Modbus module unpacks described response message and obtains significant response data, and significant response data are sent to control station with the message form packing in CAN protocol;
S5: control station unpacks the CAN protocol message that received Modbus module sends, is sent to engineer station with the message form packing in industrial ethernet protocol by significant response data storing after Modbus module database;
Also comprise,
S6:Modbus module self can virtual Modbus slave station, and connects third party Modbus main website; Effective information is sent to Modbus module by third party Modbus main website, and Modbus module unpacks described effective information and obtains valid data, and valid data are sent to control station with the message form packing in CAN protocol; Control station unpacks the CAN protocol message that received Modbus module sends, and is sent to engineer station after valid data being stored in Modbus module database with the message form packing in industrial ethernet protocol.
Further, in step S1, configuration Modbus facility information comprises device address, communication serial ports, register table, communication command, real-time data base linking relationship.
Further, described control station real-time data base is provided with two buffer zones and is respectively used to temporary described industrial ethernet protocol message and CAN protocol message.
Further, the frame format of described industrial ethernet protocol message comprises: destination address, source address, type, data, CRC, wherein data acquisition UDP message message format, comprising: IP head, UDP head, application data.
Further, the form of described application data adopts self-defining data frame format, comprising: check information one, user data and check information two.
Further, described Modbus module database is provided with two buffer zones and is respectively used to temporary CAN protocol message and the order of Modbus communication dispatch.
Another object of the present invention is to provide a kind of Modbus Field Device Management System based on real-time data base, comprise engineer station, control station, Modbus module, Modbus slave station and Modbus main website;
Modbus device configuration information is sent to control station with the message form in industrial ethernet protocol by described engineer station;
Described control station unpacks received industrial ethernet protocol message, is sent to Modbus module after valid data being stored in control station database with the message form packing in CAN protocol;
Described Modbus module unpacks received CAN protocol message, forms Modbus agreement request command forms and be sent to corresponding Modbus slave station after valid data being stored in Modbus module database;
Response message is returned to Modbus module after receiving Modbus agreement request frame by described Modbus slave station, Modbus module unpacks described response message and obtains significant response data, and significant response data are sent to control station with the message form packing in CAN protocol;
Described control station unpacks the CAN protocol message that received Modbus module sends, and significant response data storing is sent to engineer station with the message form packing in industrial ethernet protocol after Modbus module database.
Described Modbus module self can virtual Modbus slave station, and then connect third party Modbus main website, the effective information of third party Modbus main website is sent to Modbus module, Modbus module unpacks described effective information and obtains valid data, and valid data are sent to control station with the message form packing in CAN protocol; Control station unpacks the CAN protocol message that received Modbus module sends, and is sent to engineer station after valid data being stored in Modbus module database with the message form packing in industrial ethernet protocol.
Further, described control station is provided with real time data library module, and described real-time data base module installation has two buffer zones to be respectively used to temporary described industrial ethernet protocol message and CAN protocol message.
Further, described Modbus module is provided with database module, and described database module is provided with two buffer zones and is respectively used to temporary CAN protocol message and Modbus agreement request frame.
Beneficial effect of the present invention is as follows:
Utilizing real-time data base, deposit valid data, to be connected the conversion between different agreement, and enhancing Modbus device talk interconnection capability by carrying out conversion to three kinds of different agreements; Can the process signal of Modbus field apparatus be integrated in control station, whole Modbus field equipment data be sent into the engineer station of master-control room; Meanwhile, take real-time data base as medium, Modbus telecommunications modules is carrier, by other field equipment data signals of accessing in control station by the opening of Modbus virtual unit to Third party system, realize opening and interconnecting.Thus make user just long-rangely easily can check, revise, configure the configuration info of field apparatus in pulpit, and all operations all can be recorded in a database, accomplish to have good grounds, improve maintenance rate, reduce production cost.
Accompanying drawing explanation
Fig. 1 is the method flow diagram of an embodiment of a kind of Modbus equipment master-salve station communication management method based on real-time data base of the present invention;
Fig. 2 is embodiment Ethernet protocol, CAN protocol, ModbusRTU protocol conversion figure in Fig. 1;
Fig. 3 is embodiment Ethernet protocol, CAN protocol, ModbusRTU protocol frame data stream figure in Fig. 1;
Fig. 4 is the structural representation of an embodiment of a kind of Modbus equipment master-salve station communication management system based on real-time data base of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in the embodiment of fig. 1, a kind of Modbus equipment master-salve station communication management method based on real-time data base, comprises the steps:
S1: engineer station 1 passes through control engineering application software platform, configuration Modbus facility information, concrete, comprises device address, communication serial ports, register table, communication command, real-time data base linking relationship etc.; Configuration info is sent to control station 2 with the message form in industrial ethernet protocol.
S2: control station 2 unpacks received industrial ethernet protocol message, is sent to Modbus module 3 with the message form packing in CAN protocol after valid data being stored in control station real-time data base.
Wherein, Industrial Ethernet (SNET) transfer process between agreement and CAN protocol is specific as follows:
As shown in Figure 3, the frame format of Ethernet protocol message comprises: this five part of destination address, source address, type, data, CRC, wherein data we adopt UDP message message form: IP head, UDP head, application data.Application data form, we have done improvement, self-defining data frame format, add check information 1 and check information 2, which decrease the bit error rate, thus define SNET protocol theory before and after user data.
CAN protocol Extended Superframe Format comprises: this five part of command word, destination address, source address, data pointer, user data.
In control station, we establish an active station database, and described active station database is provided with two buffer zones and is respectively used to temporary described industrial ethernet protocol message and is temporary in and CAN protocol message.Industrial Ethernet (SNET) agreement and CAN protocol are isolated, simultaneously, uses different buffer zones to keep in, effective solution two kinds of protocol speed mismatch problems; Because mutually isolated, be independent of each other, it also avoid a protocol communication when ging wrong, cause the problem of another agreement.And use different buffer zones, effectively solve speed mismatch problem.Meanwhile, be defined in a local unified operation database, so at one time, an object handles database can only be had, thus avoid multiple object and process data and the operating collision that produces simultaneously, improve the efficiency that program is run.After industrial ethernet protocol message unpacks, user data is placed on the relevant position of respective operations station database, according to the specification of CAN master station protocol X3, user data corresponding in database 1 carries out encapsulation packing with the message form in CAN protocol.
S3:Modbus module 3 unpacks received CAN protocol message, forms Modbus agreement request frame form and be sent to corresponding Modbus slave station 4 after valid data being stored in Modbus module database.
Transfer process between CAN protocol and Modbus agreement is specific as follows:
Modbus protocol frame format comprises: initial, address field, function code, valid data, error checking and correction, terminate this six partial information.Wherein function code, these two parts of valid data belong to Modbus application layer data; These two parts of address field, error checking and correction belong to Modbus data in link layer; Initial, end belongs to Modbus physical layer data.
Modbus master station protocol is used in Modbus module, and the slave station protocol of CAN.We establish a Modbus module database, CAN protocol and Modbus communications protocol are isolated, and use different buffer zones to keep in simultaneously; Because mutually isolated, be independent of each other, it also avoid a protocol communication when ging wrong, cause the problem of another agreement.
After CAN protocol message unpacks, user data is placed on the relevant position of corresponding Modbus module database, according to frame format requirement in Modbus agreement, user data corresponding in Modbus module database encapsulates with Modbus frame format, form a complete Modbus agreement request frame form, complete the conversion between CAN protocol and Modbus agreement.
Response message is returned to Modbus module 3 after receiving Modbus agreement request frame by S4:Modbus slave station 4, Modbus module 3 unpacks described response message and obtains significant response data, and significant response data are sent to control station 2 with the message form packing in CAN protocol.
S5: control station 2 unpacks the CAN protocol message that received Modbus module 3 sends, is sent to engineer station 1 with the message form packing in industrial ethernet protocol by significant response data storing after Modbus module database.
S6:Modbus module self can virtual Modbus slave station, to connect third party Modbus main website, the effective information of third party Modbus main website is sent to Modbus module, Modbus module unpacks described effective information and obtains valid data, and valid data are sent to control station with the message form packing in CAN protocol; Control station unpacks the CAN protocol message that received Modbus module sends, and is sent to engineer station after valid data being stored in Modbus module database with the message form packing in industrial ethernet protocol.
In Fig. 2 embodiment, we are Modbus equipment modeling, Modbus device abstract are become a data model, are convenient to unified management.This process does not rely on Modbus agreement.
Engineer station, agreement X1 is received by obeying Ethernet based on the Modbus equipment master-salve station communication management parametric controller interface of real-time data base, configuration Modbus facility information (comprising device address, communication serial ports, register table, communication command, real-time data base linking relationship etc.), is sent to control station 2 by configuration info with the message form in industrial ethernet protocol.Meanwhile, the response message that Receiving & control ground station feeds back, this information is that in Ethernet protocol, message form returns.This message is not a complete Modbus agreement request frame information, is the Ethernet protocol Frame of standard, transmission be the valid data of Modbus device model.Relative HART protocol command, data volume is a lot of less, and has nothing to do with Modbus equipment.
At control station, according to Ethernet distribution protocol X2, it unpacks, valid data is placed on the relevant position of corresponding real-time data base after receiving the industrial ethernet protocol message that active station sends by control station.Simultaneously according to the specification of CAN master station protocol X3, control station takes out corresponding valid data with the message form in CAN protocol, and packing is sent to Modbus module.Meanwhile, according to CAN master station protocol X3, it unpacks, valid data is placed on the relevant position of corresponding real-time data base after receiving the CAN protocol message that Modbus module sends by control station.According to the concrete norm requirement of Ethernet distribution protocol X2, control station takes out corresponding valid data with the message form in industrial ethernet protocol, the Modbus equipment master-salve station communication management parametric controller be sent to based on real-time data base in engineer station of packing.
At Modbus module, according to CAN slave station protocol X4 normative content, Modbus module receives the CAN protocol message that control station sends, and it is unpacked, and valid data is placed on the relevant position of correspondence database.According to the content of Modbus master station protocol X5, Modbus module takes out corresponding valid data from correspondence database, and requires the complete Modbus agreement request frame of formation one according to frame format in Modbus agreement and be sent to corresponding Modbus slave station.CAN protocol message is self-defining CAN Frame, for the valid data transmission of Modbus device model at a high speed.And have nothing to do with Modbus equipment.Meanwhile, Modbus module, according to Modbus master station protocol X5 specification, receives the response message from Modbus slave station.Response message unpacks by Modbus module, is deposited by valid data with the message form in CAN protocol, and packing sends to control station.
In addition, Modbus module self can virtual Modbus slave station, according to Modbus slave station protocol X6 specification, receives the third party's effective information from third party Modbus main website.Third party's effective information unpacks by Modbus module, is deposited by valid data with the message form in CAN protocol, and packing sends to control station.
At Modbus slave station, according to the content of Modbus slave station protocol X7, Modbus slave station receives the Modbus agreement request frame from Modbus module, after successfully receiving, the slave station response message of correspondence is returned to Modbus module.
In third party Modbus main website, according to the content of Modbus master station protocol X8, third party Modbus main website sends third party Modbus agreement request frame to Modbus module.
Corresponding to a kind of Modbus equipment master-salve station communication management method based on real-time data base of the present invention, a kind of Modbus equipment master-salve station communication management system based on real-time data base is also provided, Fig. 4 is the structural representation of an embodiment of the Modbus equipment master-salve station communication management system that the present invention is based on real-time data base, as shown in Figure 4, described system, comprises engineer station, control station, Modbus module, Modbus equipment and third party Modbus main website;
Modbus device configuration information is sent to control station with the message form in industrial ethernet protocol by described engineer station;
Described control station unpacks received industrial ethernet protocol message, is sent to Modbus module after valid data being stored in control station database with the message form packing in CAN protocol;
Described Modbus module unpacks received CAN protocol message, forms Modbus agreement request command forms and be sent to corresponding Modbus slave station after valid data being stored in Modbus module database;
Response message is returned to Modbus module after receiving Modbus agreement request frame by described Modbus slave station, Modbus module unpacks described response message and obtains significant response data, and significant response data are sent to control station with the message form packing in CAN protocol;
Described control station unpacks the CAN protocol message that received Modbus module sends, and significant response data storing is sent to engineer station with the message form packing in industrial ethernet protocol after Modbus module database.
Described Modbus module self can virtual Modbus slave station, to connect third party Modbus main website, the effective information of third party Modbus main website is sent to Modbus module, Modbus module unpacks described effective information and obtains valid data, and valid data are sent to control station with the message form packing in CAN protocol; Control station unpacks the CAN protocol message that received Modbus module sends, and is sent to engineer station after valid data being stored in Modbus module database with the message form packing in industrial ethernet protocol.
Wherein, described control station is provided with database module, and described real-time data base module installation has two buffer zones to be respectively used to temporary described industrial ethernet protocol message to be temporary in and CAN protocol message.Described Modbus module is provided with database module, and described Modbus module database is provided with two buffer zones and is respectively used to temporary CAN protocol message and Modbus agreement request frame.
Claims (10)
1., based on a Modbus equipment master-salve station communication management method for real-time data base, it is characterized in that, comprise the steps:
S1: slip-stick artist is by control engineering application software platform, and configuration Modbus facility information, is sent to control station by configuration info with the message form in industrial ethernet protocol;
S2: control station unpacks received industrial ethernet protocol message, is sent to Modbus module with the message form packing in CAN protocol after valid data being stored in control station real-time data base;
S3:Modbus module unpacks received CAN protocol message, forms Modbus agreement request frame form and be sent to corresponding Modbus slave station after valid data being stored in Modbus module database;
Response message is returned to Modbus module after receiving Modbus agreement request frame by S4:Modbus slave station, Modbus module unpacks described response message and obtains significant response data, and significant response data are sent to control station with the message form packing in CAN protocol;
S5: control station unpacks the CAN protocol message that received Modbus module sends, is sent to engineer station with the message form packing in industrial ethernet protocol by significant response data storing after Modbus module database;
Also comprise,
The virtual Modbus slave station of S6:Modbus module self, and connect third party Modbus main website; Effective information is sent to Modbus module by third party Modbus main website, and Modbus module unpacks described effective information and obtains valid data, and valid data are sent to control station with the message form packing in CAN protocol; Control station unpacks the CAN protocol message that received Modbus module sends, and is sent to engineer station after valid data being stored in Modbus module database with the message form packing in industrial ethernet protocol.
2. according to claim 1 based on the Modbus equipment master-salve station communication management method of real-time data base, it is characterized in that, in described step S1, configuration Modbus facility information comprises device address, communication serial ports, register table, communication command, real-time data base linking relationship.
3. according to claim 1 based on the Modbus equipment master-salve station communication management method of real-time data base, it is characterized in that, described control station real-time data base is provided with two buffer zones and is respectively used to temporary described industrial ethernet protocol message and CAN protocol message.
4. according to claim 3 based on the Modbus equipment master-salve station communication management method of real-time data base, it is characterized in that, the frame format of described industrial ethernet protocol message comprises: destination address, source address, type, data, CRC, wherein data acquisition UDP message message format, comprising: IP head, UDP head, application data.
5. according to claim 4 based on the Modbus equipment master-salve station communication management method of real-time data base, it is characterized in that, the form of described application data adopts self-defining data frame format to comprise: check information one, user data and check information two.
6. according to any one of claim 1-5 based on the Modbus equipment master-salve station communication management method of real-time data base, it is characterized in that, described Modbus module database is provided with two buffer zones and is respectively used to temporary CAN protocol message and Modbus agreement request frame.
7., based on a Modbus equipment master-salve station communication management system for real-time data base, it is characterized in that, comprise engineer station, control station, Modbus module, Modbus slave station and Modbus main website;
Described engineer station is by control engineering application software platform, and configuration Modbus facility information, is sent to control station by configuration info with the message form in industrial ethernet protocol;
Described control station unpacks received industrial ethernet protocol message, is sent to Modbus module after valid data being stored in control station real-time data base with the message form packing in CAN protocol;
Described Modbus module unpacks received CAN protocol message, forms Modbus agreement request frame form and be sent to corresponding Modbus equipment after valid data being stored in Modbus module database;
Response message is returned to Modbus module after receiving Modbus agreement request frame by described Modbus slave station, Modbus module unpacks described response message and obtains significant response data, and significant response data are sent to control station with the message form packing in CAN protocol;
Described control station unpacks the CAN protocol message that received Modbus module sends, and significant response data storing is sent to engineer station with the message form packing in industrial ethernet protocol after Modbus module database.
Described Modbus module self can virtual Modbus slave station, and then connect third party Modbus main website, the effective information of third party Modbus main website is sent to Modbus module, Modbus module unpacks described effective information and obtains valid data, and valid data are sent to control station with the message form packing in CAN protocol; Control station unpacks the CAN protocol message that received Modbus module sends, and is sent to engineer station after valid data being stored in Modbus module database with the message form packing in industrial ethernet protocol.
8. according to claim 6 based on the Modbus equipment master-salve station communication management system of real-time data base, it is characterized in that, described engineer station is by control engineering application software platform, and configuration Modbus facility information comprises device address, communication serial ports, register table, communication command, real-time data base linking relationship.
9. according to claim 6 based on the Modbus equipment master-salve station communication management system of real-time data base, it is characterized in that, described control station real-time data base is provided with two buffer zones and is respectively used to temporary described industrial ethernet protocol message and CAN protocol message.
10. according to claim 6 based on the HART Field Device Management System of real-time data base, it is characterized in that, described Modbus module is provided with database module, and described database module is provided with two buffer zones and is respectively used to temporary CAN protocol message and Modbus agreement request frame.
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| 杨素珍等: "基于Modbus协议的通讯在国产分散控制系统上的应用", 《电力建设》 * |
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| CN106020143A (en) * | 2016-05-18 | 2016-10-12 | 江苏科技大学 | Distributive control system and control method thereof for glass magnesium board production line |
| CN106020143B (en) * | 2016-05-18 | 2018-07-06 | 江苏科技大学 | Glass magnesium board production line dcs and its control method |
| CN108156156A (en) * | 2017-12-25 | 2018-06-12 | 广州市熙泰自控设备有限公司 | A kind of HART protocol and MODBUS protocol converters |
| CN109725617A (en) * | 2018-12-29 | 2019-05-07 | 杭州和利时自动化有限公司 | A kind of construction method of industrial configuration platform, building system and relevant apparatus |
| CN114268517A (en) * | 2021-12-27 | 2022-04-01 | 山西晟视汇智科技有限公司 | Photovoltaic inverter multi-host secure communication method and system based on Modbus protocol |
| CN114268517B (en) * | 2021-12-27 | 2023-01-06 | 山西晟视汇智科技有限公司 | Photovoltaic inverter multi-host secure communication method and system based on Modbus protocol |
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Application publication date: 20150311 |