CN1029433C - One-board computer LAN teaching and displaying system - Google Patents
One-board computer LAN teaching and displaying system Download PDFInfo
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- CN1029433C CN1029433C CN 91102153 CN91102153A CN1029433C CN 1029433 C CN1029433 C CN 1029433C CN 91102153 CN91102153 CN 91102153 CN 91102153 A CN91102153 A CN 91102153A CN 1029433 C CN1029433 C CN 1029433C
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Abstract
The present invention relates to a set of local network system for teaching demonstration, which is composed of a main body and a software/hardware share source station, wherein the main body is composed of a plurality of TP-801 one-board computers distributed in different positions, and the software/hardware share source station is composed of an IBM-PC series microcomputer used for managing the whole system. The present invention has the advantages of complete software function, artful design of network interface, simple structure, practicality and low cost of hardware. The system which merges the operation of microcomputer, communication, control and network concept can be used in all the sections of microcomputer teaching to enhance teaching quality and lighten the work of teachers. The present invention can greatly shorten the development cycle of scientific research tasks, and can be used in industrial process control of centralized management and decentralized control.
Description
The present invention relates to a kind ofly based on the TP801-Z80 single board computer, be aided with IBM-PC series mini computing machine as soft, hardware shared resource station, a cover localized network teaching demonstration system of formation belongs to the small-sized localized network technical field of digital machine.
The technology that computing machine is unified into localized network is quite ripe, but understanding according to the applicant, all is to be the high-level localized network of main body formation with the microcomputer (also claiming system's machine) that disposes multiple peripheral hardware (as keyboard, CRT monitor, floppy disk etc.) in the prior art.It is multiple functional, but costs an arm and a leg, and the transparency is poor, and not exclusively is fit to the needs of the present universities of China in correlated curriculum teaching practices such as " Principles of Microcomputers and application ".Be limited to China's economic condition at present, the single board computer of a lot of similar TP801-Z80 has been acquired as the teaching practice means by engineering and polytechnic universities of many colleges and factories and miness institutes in recent years, course knowledge education and education again such as carry out microcomputer, control and communicate by letter.Each single card microcomputer all is in the experimental situation of single-set operation in the present practical teaching, and some unit also can only carry out some point-to-point simple communication at present through exploitation, still can not be unified into network.So in the theory teaching of some correlated curriculums, the teaching method that just adopts computing machine, communication and network to cut apart mutually, this situation can not adapt to the needs of the development and the modernizing teaching of microcomputer technology far away.
The purpose of this invention is to provide a kind of TP801-Z80 single board computer that utilizes present many universities and colleges, factories and miness and scientific research institutions to have and be main body, be aided with IBM-PC series mini computing machine as soft, hardware resources shared station, constitute the localized network teaching demonstration system of simple, practical, low-cost a, high benefit.
Another object of the present invention is a kind of contention technical method that solves network conflict of design, and the present invention just adopts: each single card microcomputer is before using bus, and the bus whether network-bus of test expression earlier takies is busy/the response shield technology of not busy monostable circuit state.
Another purpose of the present invention is to provide a kind of easy, inexpensive, practical centralized management, the technical equipment of decentralised control for industrial process control.
The present invention is distributed in student's machine on the different seats by many and the teacher computer of the total system of imparting knowledge to students and manage is formed.Teacher computer is an IBM-PC series mini computing machine that has peripheral hardwares such as floppy disk, CRT monitor, keyboard, printer and RS-232 serial communication interface, and student's machine is the TP801-Z80 single board computer that has 6 LED seven-segment displaies and simple and easy keyboard.Data line D by each single card microcomputer
7, D
6R with the RS-232 communication interface of GND line and PC
XD, T
XDConnect to form a localized network that is connected based on single card microcomputer, by bus respectively with GND.The present invention also provide a kind of set up on the hardware whether an expression network-bus take busy/(this circuit also is to utilize the device on the former single card microcomputer to convert to not busy monostable circuit, to reduce hardware spending), solve simple, the practical and technical methods of network conflict with regard to realizing each single card microcomputer its busy not busy contention mode of test earlier before using bus.
Based on the student, to take as the leading factor with the teacher, this is the distinguishing feature of education activities.The present invention has taken into full account these characteristics on networking thought and technical application, so it has improved the teaching environment of microcomputer theory and practice to a great extent.Not only changed the experiment condition of original unit independent operation, introduced the notion of communication and network, thereby can expand the course teaching content, microcomputer, control, communication and network concept are merged perforation, complied with the needs of microcomputer technology development situation, made the student accept theory teaching more directly perceived, vividerly; Also, the teacher provides condition for improving teaching environment, alleviate the teaching auxiliary labor and carry out the scientific research task exploitation.On network function is provided with, taken into full account teaching characteristic, made this network can be used for each link of microcomputer teaching.Because student's machine can be shared teacher computer (main frame) abundant software (editor of Z-80 source program, compilation, dis-assembling, the dynamic debugging of Z-80 program etc.) and hardware (peripheral hardwares such as floppy disk, display, printer) resource, make original inexpensive and simple in structure single card microcomputer function obtain very big expansion: can be in PC arbitrary access file, query directory, printing inventory; Direct communication mutually between each student's machine can be finished under the teacher assists in case of necessity; Teacher computer then can be point-to-point or broadcast mode to student's machine router, data; Can interrupt the operation of certain or some student's machine program at any time, and order the new program of its operation; Can read the internal storage data or the displaying contents of arbitrary single card microcomputer at any time; Can send some to student's machine and show phrase, and student's machine also can send Chinese information such as " fulfiling assignment ", " requesting help " on the screen of teacher computer.Because student's procedure operation can be stored in teacher's the disk, the teacher can directly move this program and verify its correctness when correcting students' papers on PC or single card microcomputer, not only fast but also reliable.In a word, it is initiative and flexible to use the present invention that the student is learnt, and step is suitable, learns many and the efficient height; The teacher can be taught students in accordance with their aptitude according to student's personal touch, the service face width, and alleviate teaching, the work of preparing lessons; Of great advantage to the quality of instruction that improves principle of microcomputer course.
The present invention abandons expensive network card or the private NNI chip classic method as single card microcomputer and network connection point, and directly uses the data bus D of TP-801 single card microcomputer
7, D
6As with the tie point of network.Owing to utilize original hardware configuration on the single card microcomputer as far as possible, make the hardware spending of whole network be reduced to each student's machine and only spend several yuans bottom line.Even for solve the custom-designed bus of network conflict problem busy/not busy monostable circuit, also be to utilize the chip on the single card microcomputer to convert, do not increase new circuit devcie spending.
Software design novelty of the present invention is ingenious, integrated the watchdog routine of network communication software and single card microcomputer, it is online promptly to network after each single card microcomputer is powered up, and does not send cue to it as long as it does not send communication request or main frame to main frame, and this single card microcomputer is in normally independently mode of operation fully; And in a single day above-mentioned two kinds of situations appear, this machine promptly enters networking automatically.Software of the present invention also makes single card microcomputer can share PC numerous soft, hardware resource, carry out such as accessing file, catalog in the PC disk, utilize operations such as PC editor, compilation, printing, dis-assembling, crossing operation, dynamic debugging Z-80 program, so, the present invention is again the senior development system of a TP-801 single card microcomputer, can greatly shorten the construction cycle of scientific research task.
In a word, although the composition of native system is very simple, two kinds of model structures, function, selling price variance are very big, but the principal character that has possessed general networking by the present invention that they are formed: constitute network by the communication line interconnection, can realize information transmission and information processing reliably, the resources such as hardware, program and data in each user's energy shared network.This network can not only satisfy school instruction demonstration need of practice, also can be used as teacher, the engineering technical personnel important means in the scientific research task exploitation, also can be in industrial processes as the very new equipment of high performance price ratio advantage that has of centralized management, decentralised control.
Fig. 1 is a hardware The general frame of the present invention.
Fig. 2 is an interface circuit principle sketch of the present invention.
Fig. 3
A, Fig. 3
B, Fig. 3
CIt is respectively the synoptic diagram of asynchronous communication word structure, mask information block structure and the file data block structure stipulated in the communication protocol of the present invention.
Fig. 4 is student's machine＜workstation〉network receiving software process flow diagram.
Fig. 5 is student's machine＜workstation〉network transmission software flow pattern.
Fig. 6 is teacher computer＜main frame〉the network software process flow diagram.
Among Fig. 1, the 1st, teacher computer＜main frame〉TM, be generally IBM-PC series mini computing machine, should dispose peripheral hardwares such as CRT monitor, floppy disk, printer, keyboard.
The 2nd, student's machine＜workstation〉SM, be the TP801-Z80 single board computer.
As shown in the figure, the present invention is made up of a main frame and Duo Tai student's machine, has only drawn four among the figure, during practical application, selects the platform number as required for use by the user, configurable 20～30 of a common teaching class.In native system, a TM main frame can be managed 225 single card microcomputer SM that are distributed on the diverse location at most, and (claims " site "-as among the figure again with the CDMA signals of two 16 system numbers
#11H,
#1FH,
#F1H,
#FFH) discern it.Employing is a symbol under unified control with 0 in the coding method, and promptly 00 is the gating station number at all working station; 01 is 11,21 ... the gating station number at 15 stations such as F1; 20 is 21,22 ... the gating station number at 15 stations such as 2F.Teacher computer can be chosen at random with one (sending out a concrete station number), one group (sending out certain row or certain row station number) or all (sending out 00 station number) student's machine to be communicated.Fig. 1 has shown that also network-bus is the R by main frame RS-232 communication interface
XD, T
XDWith the GND line respectively with the data line D of each single card microcomputer
7, D
6Be connected with the GND line and form.
Fig. 2 provides the hardware principle sketch of interface circuit of the present invention, in student's machine SM such as U
33Or U
15/2Be the original components and parts code name of TP-801 single board computer Deng numbering.The data line D that shows each student's machine among the figure
7After 74LS74 carries out data latching, 74LS33 buffering and connects, be connected to the R of teacher computer RS-232 communication port through level shifting circuit (MC1488)
XDLine.And the T of teacher computer RS-232 communication port
XDLine is connected to the EAR PHONE end of each student's machine behind electric resistance partial pressure, through the single card microcomputer internal wiring this signal is connected to U respectively again
15/24 ends and through U
13Triple gate and data line D
6Be connected.The former is that a bus that whether is taken by the expression network-bus of teacher computer control is hurried/not busy state monostable circuit, and it is the U that utilizes on the TP801-Z80 single card microcomputer
15(MC14538) chip is reequiped.The latter then is the Data Receiving line of single card microcomputer.So, the present invention be used on the network interface circuit hardware spending seldom: only used 1/2 74LS74 and 1/2 74LS33 chip (having 1/4 74LS33 chip to be used for PS7 and IOW signal and the back trigger pulse as latch in addition) for each single card microcomputer, other signals then use original rich chip design of single card microcomputer or repacking to obtain as far as possible.Total system has only used one TTL unipolarity level conversion become the MC1488 chip of bipolar signal, is connected on the R of RS-232 interface
XDEnd is at T
XDEnd adopts two divider resistances, by the original internal circuit of single card microcomputer bipolar signal is converted to Transistor-Transistor Logic level then.
The network interface of each single card microcomputer of the present invention directly hangs on the single card microcomputer internal bus, and data transmission line is by D
7Draw, self-defined network delivery outlet address is 9FH; The data that transmit are through d type flip flop (74LS74) and impact damper (74LS33) Hou Helu, again by sending to PC after the MC1488 level conversion.Single card microcomputer Central Plains I/O mouth 90H is as the network input port, and the data that PC sends are by the T of RS-232 mouth
XDEnd sends, and earlier by the divider resistance switching levels, is connected to the EAR PHONE end of each single card microcomputer more respectively, after the former self-contained circuit conversion of single card microcomputer by the D of 90H mouth
6Data line receives.
The data that PC sends are connected to U simultaneously
15/24 ends of chip, U
15/2An original monostable circuit in the single card microcomputer, after repacking, become bus busy/not busy monostable, can be triggered by the signal that single card microcomputer receives and be in transient state.It has two functions: the 1st, and by busy, not busy (high level is not busy, and low level is for busy) of Q end level sign network-bus, its state is by the data line D of single card microcomputer by the 90H mouth
7Monitor.The 2nd, enter the non-shielding interrupt source of network state by Q end level as single card microcomputer, low level produces to network interrupts application, and single card microcomputer enters network state by interrupt routine; High level does not produce and interrupts application, and single card microcomputer is in the unit duty.
The present invention adopts asynchronous communication means, signal be transmitted as start-stop type (referring to Fig. 3
AShown in), and adopt to check and add up and calibration technology.Signal transmission rate is 9600bps, and transmission range can reach more than 1000 meters.Mask information block data structure and file data block structure such as Fig. 3 of transmitting
B, Fig. 3
CShown in.Mask information data block (Fig. 3
B) form by synchronization character 5, station number word 6,7 three bytes of command word.File data blocks is then by file size 8(2 byte), start address 9(2 byte), file content 10, add up and the 11(2 byte) form.
Network conflict is one of difficult problem of computer networking.Prior art has three kinds of modes on the network conflict that solves by the bus networking: comprehensive three kinds of reservation, contention and reservation-contention.Their realization all needs a large amount of soft, hardware supported.The present invention then adopts and a kind ofly is referred to as to respond shield technology and solves network conflict.This technology on hardware, only used a bus busy/not busy monostable circuit is (by U
15/2Convert), just be implemented in and use its busy not busy contention strategy of the preceding test earlier of bus.Concrete steps are as follows: before each student's machine transmission information, test the state of busy/not busy monostable circuit earlier: if " hurrying ", then show bus takies; If " spare time " then sends the mask information data block of being made up of synchronization character, station number word, command word earlier.Teacher computer is after receiving the mask information piece, and former state is beamed back this mask information piece, and the busy/not busy monostable circuit on all student's machines all is set to " doing " attitude, and at this moment, other student's machines just can not take network-bus again.Student's machine of former transmission mask information piece reception check mask information piece content that teacher computer sends correct after, just can do transmission or reception and wait next step operation; As check wrongly, then withdraw from.The enforcement of this technology not only effectively reduced the probability that network conflict takes place, and hardware spending is economic, is again to utilize existing device repacking on the single card microcomputer, does not almost have the hardware expenditure; Software design is simple, practical, be skillfully constructed, and effectively solved the network conflict problem.
The present invention network software as a module of single card microcomputer watchdog routine and combine together with watchdog routine.Its superior part is: can not only effectively utilize extremely limited memory space of single card microcomputer, the more important thing is that making each single card microcomputer that hangs on the network save networking removes the net formality, powering up after the start can the unit independently working, can directly under network state, work again, be particularly suitable for the student and use, created condition for extending to automated workshop realization remote-controlled start-up simultaneously.
Fig. 4, Fig. 5 have introduced the software flow that student's machine network receives and sends.Receiving software wherein shown in Figure 4 is the initialization S2 that just enters the reception program after judging affirmation communication disruption S1, again and then the signal of judging student's machine and teacher computer S3 whether synchronously, if asynchronous, just interrupt returning S4, if synchronously, then and then the S5 that judges whether to communicate by letter with this machine; If not (site is not inconsistent) just interrupts returning S6, state exits network; If then receive command code S7, and find the entry address S8 of each program, and change corresponding command processor S9 over to according to command code.These command processors have: receive PC disk file catalogue S10, receive file and carry out S11 immediately, receive file and do not carry out S12 at once, send file and be stored in S13 in the PC disk, send transient copy code S14, show Good S15, show HaLt S16 and show ErrO S17.Wherein " transmission displaying information on screen " has: " * * number single card microcomputer finished assignment, please teacher's examination! ", " * * number single card microcomputer runs into knotty problem and can't solve, please teacher help! ", " * * number single card microcomputer application print file! ", " * * number single card microcomputer asks the teacher that demonstration programme is provided! " ..., above-mentioned Chinese character information all can show on the CRT of teacher computer display screen.Student's machine shown in Figure 5 sends software and then starts S20 by the operator by command key: at first be to put delay time constant S21, check the busy not busy S22 of bus then, if bus is busy, then show " ErrO " S23 on light-emitting diode display; If in the bus spare time, just judge that delay time arrives? S24 did not arrive as the time, then send out mask information piece and demonstration: " HaLt " S25, wait for the teacher computer response, as time is up, with regard to router initialization S26 with send mask information piece S27 and repeat to show " Halt " S28.If what send is brief information, will on the screen of teacher computer, show.
The network software function of teacher computer is very strong, adopts the menu Chinese character prompting, facilitates and simplifies operation greatly.Detailed process as shown in Figure 6.At first start the machine T1 and RS-232 carried out initialization T2 shows menu Chinese character on screen, offer Z-80 file directory window and network operations information prompt window T3, then the teacher computer state T5 of inquiry keyboard state T4 and inquiry RS-232 mouth repeatedly just; If there is command key to press, promptly turn to corresponding command processor (seeing Fig. 6 for details); At first check it is the effective order key? T6, if not, then turn back to program T3, if the effective order key then changes command processor T7 over to.These command processors include: inquiry disk directory file T70, send file T71 to single card microcomputer, send information T72 to single card microcomputer, transfer single card microcomputer displaying contents T73, transfer single card microcomputer internal storage data T74, revise its internal storage location content T75 voluntarily, editor, printing source program T76, cross assembly Z-80 program T77, dynamic debugging Z-80 program T78 calls senior disk tools T79 and termination routine operation T80.As not pressing command key, then enter inquiry RS-232 mouth and have or not the state T5 of input signal, if there is not input signal, then turn back to program T3; If any the signal input, then enter accepting state, and change corresponding handling procedure (seeing Fig. 6 for details) over to: check to be synchronous code 85 earlier according to the synchronization character of receiving? T8; In this way, then read station number word T81, read command word T82 and former state are returned T83.As not being, then check to be synchronous code 75? T9; In this way, then read reveal codes T91, press the T92 of reveal codes branch, show respectively: the T93 that wants help, T94 is finished in operation, and T95 and application demonstration T96 are printed in application.As not being synchronous code 75, then check to be synchronous code 31? T10; As not being, then turn back to program T3 again, in this way, then read filename T11, remove to carry out respectively the T13 that looks into the catalogue by the T12 of command code branch, file save T14 and get order such as disk file T15.In communication process, the multidate information prompting of the network operation is arranged on the display of teacher computer at any time, made things convenient for teacher's management and teaching.
Utilize six LED seven-segment displaies of single card microcomputer to carry out catalog search, also be a characteristic of the present invention: after single card microcomputer receives the directory content that PC sends, automatically count total directories, on display, show " FILS * * " (back two is the total directories that 16 systems are represented).At this moment, the operator can order, upwards inquire about desired file downwards by LAST, NEXT key, and at this moment preceding four of display is filename, and back two is the serial number of 16 systems.After finding needed file, just this file can be taken out from the PC disk by the LOAD key, the single card microcomputer of packing into directly moves.If the known file name, single card microcomputer can take out file in two ways from the PC disk: if the file that our station is deposited only needs to key in two filenames, press the LOAD key, single card microcomputer can add before this document name automatically and take out file then by the our station station number; If not the file that our station is deposited needs to key in 4 filenames, press the LOAD key and take out file.
Though the present invention is a localized network for the teaching demonstration exploitation, but because each student's machine is the very strong TP-801 single board computer of versatility, therefore, use in the suitable especially industrial process control that is generalized to decentralised control, centralized management of its hardware configuration and networked body thought and software.Each single card microcomputer (workstation) can be used as the control main body of certain program controlled machine tool or program control production line, and PC is as console for centralized control, the operation operation of each workstation in overall coordination and the centralized management whole production scene.The production management personnel only need be by handling work that PC just can each procedure of coordinative command and cooperating, and also can change the control program of certain or some machine at any time, the work present situation that also can inquire about each machine of understanding at any time.
The present invention implements in my school, becomes teaching lecture experiment network with 1 IBM-PC micro mechanism with 20 TP-801 single card microcomputers, and is on probation through teachers and students, obtained the invention effect of expection.
Claims (3)
1, a kind of one-board computer LAN teaching and displaying experimental system is imparted knowledge to students and the teacher computer (main frame) of managing total system is formed by many student's machine (workstation) He Yitai that are distributed on the different seats, it is characterized in that:
1) teacher computer (main frame) is an IBM-PC series mini computing machine that has peripheral hardwares such as floppy disk, CRT monitor, keyboard, printer and RS-232 serial communication interface, student's machine is the TP801-Z80 single board computer that has 6 LED seven-segment displaies and simple and easy keyboard, and network-bus is by various single card microcomputers and the data bus D that connects
7, D
6With ground wire respectively with the R of the RS-232 communication interface of PC main frame
XD, T
XD, ground wire is connected and forms;
2) teacher computer (main frame) is discerned each student's machine (workstation) with the CDMA signals of two 16 system numbers, and data that transmit between main frame and the workstation and control signal are the start-stop type heterochronous digital signals;
3) all be provided with a bus that whether is taken by the expression network-bus of teacher computer control on each student's machine and hurry/not busy state monostable circuit, teacher computer and each student's machine all are in line networking duty;
4) the data line D of each student's machine
7After 74LS74 carries out data latching, 74LS33 buffering and connects, be connected to the R of teacher computer RS232 communication port through level shifting circuit (MC1488)
XDLine; The T of the RS-232 communication port of teacher computer
XDLine is connected to the EAR PHONE end of each student's machine, circuit and data line D in the study of Confucian classics life again behind electric resistance partial pressure
6Connect;
5) nearly 225 student's machines that are distributed on the different seats can be managed, be supervised to teacher computer, and adopt 0 being the coding method of symbol under unified control, so that teacher computer can be selected to communicate with one, one group or school's machine;
6) the expression network-bus busy/not busy state monostable circuit is the U that utilizes on the TP801-Z80 single card microcomputer
15(MC14538) chip is reequiped.
2, the method for the network conflict of a kind of employing response shield technology as claimed in claim 1 solution is characterized in that: may further comprise the steps:
1) before each student's machine transmission information, test the state of busy/not busy monostable circuit earlier: if " hurrying ", then time-out sends and demonstration " ERRO "; If " spare time ", then send the mask information piece of forming by synchronization character, station number word, command word earlier;
2) after teacher computer was received the mask information piece, former state was beamed back the mask information piece, and the busy/not busy monostable circuit on all student's machines all is set to " doing " attitude, and this moment, other student's machines just can not take network-bus again;
3) student's machine of former transmission mask information piece receive, check mask information piece content that teacher computer sends correct after, just can send, further work such as reception; Wrong as if checking, then withdraw from.
3, the application of a kind of one-board computer LAN teaching and displaying experimental system as claimed in claim 1 in industrial processes control, it is characterized in that: with the control main body of each student's machine (workstation) as certain program controlled machine tool or program control production line, and teacher computer (main frame) is as console for centralized control, the operation operation of each terminal in the overall coordination commander whole production scene.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91106076 CN1054862A (en) | 1991-04-09 | 1991-04-09 | Energy-saving device for single-phase electric devices |
| CN 91102153 CN1029433C (en) | 1991-04-11 | 1991-04-11 | One-board computer LAN teaching and displaying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102153 CN1029433C (en) | 1991-04-11 | 1991-04-11 | One-board computer LAN teaching and displaying system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1054682A CN1054682A (en) | 1991-09-18 |
| CN1029433C true CN1029433C (en) | 1995-08-02 |
Family
ID=4905446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91102153 Expired - Fee Related CN1029433C (en) | 1991-04-09 | 1991-04-11 | One-board computer LAN teaching and displaying system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1029433C (en) |
-
1991
- 1991-04-11 CN CN 91102153 patent/CN1029433C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1054682A (en) | 1991-09-18 |
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