CN1804948A - Network-based remote electronic circuit experimental method and system - Google Patents
Network-based remote electronic circuit experimental method and system Download PDFInfo
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Abstract
The invention relates to a remote electronic circuit experimental approach and system based on network. The client end program device provides the remote operating apparatus, the user interface of the combining experiment circuit and achieves the remote control, control measuring apparatus and circuit; the client end program device comprises a function generator part program device, an oscillation detector part program device and an experiment circuit part program device; the function generator part program device simulates the basic function of the function generator and generates the control order. The oscillation detector part program device simulates the basic function of the oscillation detector and generates the control order. The experiment circuit part program device provides the operating interface of the experiment circuit and finishes the choosing and setting of the circuit; the server program device receives the client end sent control operating order information and stores it in the database.
Description
Affiliated technical field
The present invention relates to a kind of based on network remote electronic circuit experimental method and system. Belong to field of computer technology.
Background technology
The student of the electric class specialty of university will carry out the multinomial experiments such as Circuits and Systems, Analogical Electronics, Fundamental Digital Circuit respectively, on average will finish the infrastest in 100 class hours. Electronic-Lab is the important teaching basis facility of the subjects such as electronic information, computer, electrical engineering, electromechanical integration. Master basic electronic circuit experiment technical ability, learning electronic technology and engineering electronic instrument by experiment and use operating technology, is the important subject training objective of above-mentioned subject. Along with the development of electronic technology, the EDA technology is becoming the basic research and development instrument of electronic technology, also is the substance of teaching. But the EDA technology provides a perfect instrument, requirement has the professional technique background and could use, and the undergraduate does not have corresponding professional technique background when the relevant course of study electronic circuit, prerequisite knowledge and technology when just the opposite, the student wants the learn for its usage instrument just. Simultaneously, eda tool provides the result of calculation of a computer program, and its result has certain difference with real Experiment of Electrical Circuits. Share by Long-distance Control and many people take real experimental circuit as the basis in based on network remote electronic circuit laboratory, realizes wanting the time, want the space, wanting the purpose of equipment to network and multimedia technology, and this is the vitality place of Distance Laboratory just.
According to the practice of teaching and the result of patent consulting, existing network remote experimental education method roughly has two kinds:
1, take eda software as the basis, carry out the operated from a distance experiment by network, this kind method can be carried out most
Electronic circuit experiment.
This kind method is with article " the electronic remote experimental center of the cybertimes is built " Wen Wei representative of PLA's Institute Of Electrical Engineering Experiment of Electronic Technology center Li Dongsheng in " education skill research " magazine. The realization of this kind method is take eda software as the basis, mode by client-server, make the student can the long-range EDA of utilization software carry out electronic circuit experiment (such as analogous circuit experiment etc.), simultaneously by making some electronic courseware, make the process that the student can the distance learning experiment.
The disadvantage of this kind method is to finish experiment with various simulation softwares and computer animation, is actually the software emulation of having finished experiment, and experimental result is calculated by software, does not have or the seldom really participation of Experimental Hardware instrument. Adopting long-range mode is the software of long-range utilization computer.
2, take computer-experiment as main body, carry out some special tele-experimentations.
This kind experiment is take patent of invention " computer long distance remote control experimental system and experimental technique thereof " (application (patent) number 01132202.0) as representative. The important communication experiment for computer-experiment and part of this kind experimental technique, experimental technique is for to programme to the intelligence instrument that is connected on the server by computer network, thus control reaches the purpose of experiment.
The shortcoming of this kind experimental technique is: can only operate corresponding intelligence instrument when testing by network, the experiment kind of finishing is less, and limitation is larger. This kind method can be long-range the instrument of control section intelligence, can not the real electronic circuit experiment circuit of Long-distance Control, do not have the use of side circuit, do not have many people to share simultaneously possibility of laboratory apparatus, just finished the far-end of some instruments and controlled.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of based on network remote electronic circuit experimental method and system.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of based on network remote electronic circuit experimental system has client-side program device, server program device, hardware device etc.
Hardware device comprises:
A) station server and corresponding network equipment;
B) an Agilent 54645D digital oscilloscope (server is controlled by gpib interface);
C) an Agilent 33120A signal generator (server is controlled with the RS232 serial ports);
D) a Special experimental case (adopting RS485 to communicate by letter with server);
E) some Pc terminals (passing through network connection with server);
Client-side program device: the user interface that operated from a distance instrument, combination experiment circuit are provided, realize remote control, control tester and circuit, the client-side program device has function generator subprogram device, oscillograph subprogram device, experimental circuit subprogram device;
Function generator subprogram device: the basic function of simulation A33120A function generator part, and produce control instruction.
Oscillograph subprogram device: the oscillographic basic function of simulation HP54645D, and produce control instruction. Experimental circuit subprogram device: provide the operation interface of experimental circuit, the selection of completing circuit and setting;
The server program device: (1) receives the login of client transmission and the control operation command information of sending, and they are left in the database; The order of (2) storing in the performing database, and execution result is deposited into database; (3) result in the database is sent to the user.
A kind of based on network remote electronic circuit experimental method, the step of realization has;
Step 1: server and remote client end program are opened, and system hardware connects.
Step 2: the login of remote client end program, the choice experiment content is to the control instruction of server end transmission instrument and experiment.
Step 3: after server receives order, by the database of the sequential storage of accepting to server;
Step 4: server sends a command to respectively signal generator, experimental box and oscillograph according to the order of each form in the database,
Step 5: signal generator and oscillograph are received the true setting of finishing instrument after the control command;
Step 6: after experimental box is received order, utilize the relative set of electronic switch to finish the student finishes experiment in client concrete connection;
Step 7: server end sends to remote client end with the legitimate reading of experiment
Step 8: remote client end is presented at the experimental result waveform on the software oscillograph.
The invention has the advantages that:
1, by information network University Electronic Laboratory is expanded to the network terminal, the student does the restriction that experiment no longer is subjected to when and where, has greatly improved the space in laboratory.
2, share by network, greatly improved the utilization rate of instrument and equipment. The instrument effective rate of utilization in laboratory is lower at present, for example signal source and oscillograph, actual in an experiment of every group of instrument utilizes about 5% (times of real optical viewer in the experimentation) that the time only accounts for all experiments were time, but is difficult to satisfy the requirement that the student uses instrument and equipment at any time. Share by network, the student can both use operating instrument equipment at any time in needs on any one networking terminal. The student that one cover experimental instrument and equipment can offer more than 10 simultaneously uses, and the utilization rate of laboratory apparatus can improve more than 20 times. Simultaneously, also be conducive to accurate and the use of high-grade electronic instrument in teaching.
3, the remote electronic circuit experimental system provides true connection and the actual result of electronic circuit experiment, rather than the simulation result under the ideal conditions.
4, the remote electronic circuit experimental system has connected multiple intelligence instrument and special-purpose experimental box, and the student can by the real circuits in the true control instrument of network and the experimental box, test.
5, based on network remote electronic circuit experiment can allow many people's while On-line Control to use same set of experimental system.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the structure chart of system of the present invention.
Fig. 2 is the flow chart of client-side program.
Fig. 3 is server end software and hardware experiment flow figure.
Fig. 4 is client software instrument control surface chart.
Fig. 5 is client experimental circuit control surface chart.
Fig. 6 is experiment box circuit master control architecture block diagram.
Fig. 7 is experiment box circuit card plugging structure block diagram.
Fig. 8 is oscillogram.
The specific embodiment
Embodiment 1: in Fig. 1, Fig. 6, whole experimental system can be divided into three parts: client-side program, server program, server and the hardware device of controlling comprise laboratory apparatus case and oscillograph (model is the A54645D of Agilent company) and signal generator (model is the A33120A of Agilent company) that can be program control.
The hardware device of remote experimental system comprises:
1. a station server and corresponding network equipment;
2. an A 54645D digital oscilloscope (server is controlled by gpib interface);
3. A 33120A signal generator (server with the control of RS232 serial ports);
4. experimental box (adopting RS485 to communicate by letter with server);
5. some Pc terminals (passing through network connection with server);
Client-side program has signal generator, oscillograph software operation interface, and 26 comprise Circuits and Systems and analogous circuit experiment interface. The operation interface of instrument is consistent with the true instrument panel of server end, and the experimental circuit that the experiment interface comprises has real experimental circuit in the experimental box of server end. The user arranges the parameter of software Instrumental, corresponding experimental circuit is connected, software is converted to order data to the operation information of signal generator, oscillograph, experimental circuit, and by Internet it is sent in the database of server.
As shown in Figure 3, server program adopts the method for timesharing to process to each user's operating data. Before the serviced device routine processes of active user's experimental implementation data was complete, user's all operations data all were kept in the database of server in order.
Server program is received user's operating data, and circuit in its laboratory apparatus of controlling and the experimental box is arranged, and sets up the experimental situation of user's request. At first, server program is by RS232 interface control A33120A signal generator, and according to user's operation, the signalization generator produces the output signal with characteristics such as amplitude that the user requires, frequencies, and signal is input in the experimental box; Afterwards, server program is controlled experimental box by RS485, according to user's operating data, connects corresponding experimental circuit in the experimental box by the control electronic switch, and corresponding experimental circuit parameter is arranged. After setting experimental circuit, server program is by the A54645D digital oscilloscope in the digital interface control laboratory, the input signal of test experiments circuit and output signal. Server program is saved in experimental result in the database after a user's experimental implementation is finished, and then experimental result is sent it back client, and is presented at by client-side program on the signal generator and oscillographic panel of client. After this user's experiment is handled, turn to the processing to next user's request.
Formed computer network with a station server and some Pc terminals and the network equipment among the present invention. The student can at the enterprising line operate of terminal computer, test. Computer network can be LAN, also can be wide area network, can greatly carry out the extension in space like this, and native system utilizes respectively in the Pc in Sweden and Taiwan terminal and tests, and is respond well. The hardware of server and Pc terminal and the network equipment all adopts existing technology. The experimental box, signal generator, the digital oscilloscope that are connected on the server are the main bodys of hardware unit of the present invention. Wherein the design of experimental box is the innovation on the hardware, and utility model patent has been applied in the design of experimental box.
1) signal generator
A33120A is that U.S. Agilent company adopts up-to-date brand new technical manufacturing, and it provides, and the 15MHz global function is linear, log scan; Inner AM, FM, the functions such as FSK; It is the AWG of a kind of 12bit, 40Msa/sl, the 6k degree of depth. A 33120A comprises the RS-232 interface standard, by the same server communication of RS-232 interface of server.
2) oscillograph
Novel A54645D mixed signal oscillograph is that U.S. Agilent company adopts up-to-date brand new technical manufacturing. Made up the analysis ability of oscillograph to signal detail, the various advantages of the multichannel Timing measurement ability of logic analyser and dark storage. Adopted in addition the MegaZoom new technology of Agilent company original creation. The organic integration of 2 channel oscilloscopes and 16 logic timing channels, A54645D comprises that gpib interface is connected with server by the gpib interface card of special use.
3) experimental box
The function of the hardware experiments case of remote electronic circuit experimental system is to provide all kinds of experimental circuits for remote experimental system. This hardware experiments case has comprised all experimental circuits in the client end interface, such as the experiment of basic operation amplifier class, signal generator experiment, multiplier experiment, detection experiment, phaselocked loop experiment etc., so that the user can carry out the basic electronic circuit experiment of Long-distance Control by native system.
The circuit operation interface of operator by client connects and sets up tested circuit, circuit parameter is set, the operational order that forms sends to server by Internet, server sends the real experimental circuit of order control by the RS-485 interface, and test by GPIB and RS-232 interface control figure oscillograph and signal generator, the test result passback is presented on the panel of virtual instrument of client. Experimental box is divided into two parts: master control borad part and plug-in card experimental circuit part. Master control borad is a single-chip computer control system, comprises single-chip microcomputer, expansion slot, RS-485 interface circuit, four functional modules of I/O channel control.
Master chip on the master control borad has used the MC68HC05C9 chip of Motorala company. Control logic on the single-chip microcomputer management master control borad, the main function that realizes is: by asynchronous serial communication interface (SCI) through RS-485 bus and server communication, receive and carry out the operational order that server sends, after operational order processed, by corresponding experimental circuit on the I/O channel control module on the I/O mouth control master control borad and the expansion slot, carry out experimental circuit and connect, circuit parameter is set, connect I/O channel. On master control borad, mainly use the asynchronous serial communication interface (SCI) of MC68HC05C9, used MAX481 RS-485 serial communication interface chip at master control borad.
All with the form design of plug-in card, Fig. 7 is experiment box circuit card plugging structure block diagram to all experimental circuits. Be designed to like this system the interface of expanded function is provided, can make the manager of system according to the special requirement of our unit's content of courses, design new experimental circuit, for system increases new experiment content, thereby improved the flexibility of system management and use.
Card insertion circuit comprises master control borad interface, card insertion circuit controller, experimental circuit three parts.
The interface of each piece card insertion circuit and master control borad is standard. Particular content is referring to the introduction of expansion slot interface part.
The card insertion circuit controller uses a slice Lattice ispLSI 1016-60 PLCC44-I chip. Its function control is each element on the experimental circuit plug-in card. The control address wire is as its input, and the gating pin of each element on its output and this plug-in card is connected. The normally used element of experimental circuit is resistance, electric capacity. In experimental circuit, use digital regulation resistance, thereby reach the purpose that changes resistance parameter in the circuit.
Digital regulation resistance and the simulant electronic switch unified addressing in the experiment box hardware system, all experimental circuit plug-in cards used, when the address of certain element of server being outputed on the control address wire add7-add0, card insertion circuit controller on this element place experimental circuit plug-in card can be deciphered it, thereby control this element, or open simulant electronic switch, or gating digital regulation resistance. By the control to the element in the experimental circuit, thereby reach control to experimental circuit. Experimental circuit then can design as required, and the element that needs to regulate parameter can use digital regulation resistance or simulant electronic switch.
Implementation method
The present invention is mainly take distinctive experimental technique as innovation, the major part of innovation is on the client computer of network, the student can carry out the parameter setting by the specific instrument of specific software and experimental circuit operation interface, then sends the connected mode that order and experimental circuit are set of instrument to server. After server receives order, by the database of the sequential storage of accepting to server. Database comprises the contents such as instrumentation table, circuit connection table, user message table. Server sends a command to respectively signal generator, experimental box and oscillograph according to the order of each form in the database. Signal generator and oscillograph are received the true setting of finishing instrument after the control command, and the student has just finished concrete setting to instrument at the client far-end like this. After experimental box is received order, utilize the relative set of electronic switch to finish the student finishes experiment in client concrete connection, it should be noted that the real circuits of all experiments that comprised in the experimental box that client end interface can be finished, can finish connection with electronic switch by order. Concrete data flowchart as shown in Figure 2.
The design of software mainly is divided into client-side program and server program two parts. The software programming language of selecting is C++Builder, and that server database is partly selected is SQL Server. Whole system operates in the network environment of Internet. The service condition of client is: system platform and ICP/IP protocol that Java Virtual Machine is installed. The service condition of server is: Windows NT Server, SQL Server database and ICP/IP protocol are installed.
1) client-side program design
Client-side program provides the friendly interface of operating instrument, combination experiment circuit. Client-side program will be realized remote control, control tester and circuit, and key is the establishment of following 3 subprograms:
A) function generator part: the basic function of simulation A33120A function generator part mainly comprises:
The generation of six kinds of waveforms; The modification of amplitude, frequency and OFFSET value.
B) oscillograph part: the oscillographic basic function of simulation HP54645D mainly comprises: two track waveforms show; The adjusting of waveform; Fundamental quantity is such as the measurement of voltage (Vpp, Vavg, Vtop, Vrms, Vmax, Vmin, Vbase); The measurement in frequency, cycle (freq., period, Duty Cy ,+Width ,-Width, RiseTime, FallTime); The setting of display mode commonly used.
C) experimental circuit part: provide the operation interface of experimental circuit, the selection of completing circuit and setting.
2) server program design
Server program is mainly finished three tasks: (1) receives login and the operational order information that client sends, and they are left in the database; The order of (2) storing in the performing database, and execution result is deposited into database; (3) result is sent to the user. Therefore, server program has comprised three threads, finishes respectively above-mentioned three tasks.
Server database has 5 tables, associates with public field UID between each table. The function of tables of database is as shown in table 1:
| Table name | Implication | Function |
| Login | User's login | The information of recording user login is such as password, Computer IP address, whether be in the Active state. |
| CMD | The command string storehouse | Record long-distance user's command information arranges environment, fill order. |
| RST | Results repository | The result that register instrument is measured |
| Set_Gen | The function generator storehouse | The state that arranges of record function generator |
| Set_Ocsi | The oscillograph storehouse | The state that arranges of recording oscillometer |
The classification of table 1 database
The server program idiographic flow is as follows:
At first, whether server program detects has information to send into, if do not have, and circular wait. If have, check whether to be log-on message, be confirmed to be user login information after, it is deposited in the login database, if command information then deposits in the CMD database.
Then, read the CMD database, check whether user command is arranged, read the concurrent order of losing one's life, carry out setting and experimental implementation and the test of experimental situation, and the test result of returning is saved in the RST database. Read again the data in the RST database, check whether the result is arranged, according to user's IP the result is sent to corresponding user.
Embodiment 2: experiment for example
Below to finish the experiment of operational amplifier the most common in university's electrical experiments in client as example, the process that whole experiment is finished is described. Experiment utilizes signal generator input 1KHz sinusoidal wave take operational amplifier LM324 as main body, and amplitude is 1V, utilizes oscillograph to observe the input and output side of amplifier, and output should be the sine wave of amplification, can change feedback resistance simultaneously and change multiplication factor.
1) registered user name is downloaded experiment client (any Pc terminal in network).
The user opens program in client, and the login connection server is selected " application of operational amplifier----sign-changing amplifier " in the program of client, connects circuit (as shown in Figure 5) in program. Signalization generator and oscillographic control parameter after finishing, are pressed the POWER key and are sent instruction to server.
2) by network, server receives the order that client sends, and sends to after treatment the single-chip microcomputer M69HC05C9 of the MCU------MOTOROLA company on the experimental box by the serial ports (RS485 standard) of server again. Send control command to signal generator through another serial ports (RS232 standard), send order to oscillograph by gpib interface.
3) after experimental box MCU received the order that will do the sign-changing amplifier experiment, the circuit in the control experimental box was connected the connection of sign-changing amplifier circuit with electronic switch.
4) after signal generator and oscillograph are received order, finish setting, oscillograph with real Wave data by Internet Transmission to server.
5) server sends to the Pc terminal according to record with Wave data, the terminal display waveform, as shown in Figure 8.
6) Next Command of server reading order formation is tested again.
Claims (5)
1. a based on network remote electronic circuit experimental system has client-side program device, server program device, hardware device, it is characterized in that:
Hardware device comprises: a station server and corresponding network equipment; One number of units word oscillograph; A signal generator; A Special experimental case; Some station terminals;
Client-side program device: the user interface that operated from a distance instrument, combination experiment circuit are provided, realize remote control, control tester and circuit, the client-side program device has function generator subprogram device, oscillograph subprogram device, experimental circuit subprogram device;
Function generator subprogram device: the basic function of analogue function generator part, and produce control instruction;
Oscillograph subprogram device: the basic function of analog oscilloscope, and produce control instruction;
Experimental circuit subprogram device: provide the operation interface of experimental circuit, the selection of completing circuit and setting;
Server program device: receive the login of client transmission and the control operation command information of sending, and they are left in the database; The order of storing in the performing database, and execution result is deposited into database; Result in the database is sent to the user.
2. the experimental technique of a kind of based on network remote electronic circuit experimental system according to claim 1 is characterized in that the step that realizes has;
Step 1: server and remote client end program are opened, and system hardware connects;
Step 2: the login of remote client end program, the choice experiment content is to the control instruction of server end transmission instrument and experiment;
Step 3: after server receives order, by the database of the sequential storage of accepting to server;
Step 4: server sends a command to respectively signal generator, experimental box and oscillograph according to the order of each form in the database;
Step 5: signal generator and oscillograph are received the true setting of finishing instrument after the control command;
Step 6: after experimental box is received order, utilize the relative set of electronic switch to finish the student finishes experiment in client concrete connection;
Step 7: server end sends to remote client end with the legitimate reading of experiment;
Step 8: remote client end is presented at the experimental result waveform on the software oscillograph.
3. the experimental technique of a kind of based on network remote electronic circuit experimental system according to claim 2 is characterized in that; Client-side program has function generator partly to produce six kinds of waveforms, modification amplitude, frequency and OFFSET value; There is oscillographic pair of track waveform of oscillograph partial simulation HP54645D to show; The adjusting of waveform; Fundamental quantity is such as the measurement of voltage; The measurement in frequency, cycle; The setting of display mode commonly used; The experimental circuit part is arranged: provide the operation interface of experimental circuit, the selection of completing circuit and setting;
Server program receives login and the operational order information that client sends, and they are left in the database; The order of storing in the performing database, and execution result is deposited into database; The result is sent to the user.
4. the experimental technique of a kind of based on network remote electronic circuit experimental system according to claim 3 is characterized in that; The server program idiographic flow is as follows:
Whether server program detects has information to send into, if do not have, circular wait if having, checks whether be log-on message, be confirmed to be user login information after, it is deposited in the login database, if command information then deposits in the CMD database; Then, read the CMD database, whether check has user command, read the concurrent order of losing one's life, carry out setting and experimental implementation and the test of experimental situation, and the test result of returning is saved in the RST database, read again the data in the RST database, check whether the result is arranged, according to user's IP the result is sent to corresponding user.
5. the experimental technique of a kind of based on network remote electronic circuit experimental system according to claim 4 is characterized in that; All experimental circuit plug-in cards use in the experiment box hardware system digital regulation resistance and simulant electronic switch unified addressing.
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| CN105575209A (en) * | 2016-02-22 | 2016-05-11 | 江苏信息职业技术学院 | Electrical teaching system |
| CN107067907B (en) * | 2016-03-09 | 2019-08-16 | 南京邮电大学 | A kind of restructural online experiment chamber system of real time remote |
| CN107067907A (en) * | 2016-03-09 | 2017-08-18 | 南京邮电大学 | A kind of real time remote restructural online experiment chamber system |
| CN107026906A (en) * | 2017-03-30 | 2017-08-08 | 上海新时达电气股份有限公司 | Smart scope Internet of things system and oscillograph method for remote management |
| CN107204133A (en) * | 2017-06-15 | 2017-09-26 | 西安交通大学 | A kind of automatic teaching and examination robot |
| CN107204133B (en) * | 2017-06-15 | 2020-05-22 | 西安交通大学 | Automatic teaching, examination and acceptance robot |
| CN109218399A (en) * | 2018-08-06 | 2019-01-15 | 朱凌 | A kind of implementation method for the remote control experimental facilities that virtual reality combines between colleges and universities |
| CN109033414A (en) * | 2018-08-06 | 2018-12-18 | 朱凌 | A kind of implementation method for the remote control experimental facilities that virtual reality combines |
| CN110009980A (en) * | 2019-03-28 | 2019-07-12 | 北京科技大学 | A kind of oscillograph interactive teaching methods and system |
| CN110009980B (en) * | 2019-03-28 | 2021-05-04 | 北京科技大学 | Oscilloscope interactive teaching method and system |
| CN110782724A (en) * | 2019-10-14 | 2020-02-11 | 淮安中科晶上智能网联研究院有限公司 | Experiment platform based on remote operation and implementation method thereof |
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| CN100492445C (en) | 2009-05-27 |
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