CN102636997A - Simulation method for analog input and switch output module - Google Patents
Simulation method for analog input and switch output module Download PDFInfo
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- CN102636997A CN102636997A CN2012101459557A CN201210145955A CN102636997A CN 102636997 A CN102636997 A CN 102636997A CN 2012101459557 A CN2012101459557 A CN 2012101459557A CN 201210145955 A CN201210145955 A CN 201210145955A CN 102636997 A CN102636997 A CN 102636997A
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Abstract
The invention provides a simulation method for an analog input and switch output module, and relates to the technical field of communication and computer application, in particular to a serial communication and computer monitoring technology. An output switch of a simulation module designed by using the method can be controlled by a master controller; the state of the output switch and the value of input analog can be queried by the master controller; hardware cost is not required for the simulation module; a communication protocol is directly displayed on a main interface of the simulation module without turning over a manual; the address of the simulation module, the state of an RS-232 interface, the state of the output switch, the value of input analog, the data receiving and transmitting state and transmitted data are all displayed on the main interface of the simulation module; and data communication and processing have the same effect as a real object module.
Description
Technical field
The present invention relates to communication and Computer Applied Technology field, relate in particular to serial communication and computer monitoring technology.
Background technology
Computer supervisory control system is widely used in various fields, and data acquisition and output control module are the indispensable input/output modules that computer supervisory control system is directly followed monitored object association, and; The module that adopts serial line interface (RS-232) to communicate by letter with main control computer is more; This module is used for the real standard practice of engineering project of colleges and universities' computer-related speciality, can let students understand and experience agreement, puts into practice the method for RS-232 interface communication; Can adopt assembly language, Turbo C language, Java language and .NET language that module is inquired about and controlled; Can preserve data (like alarm logging) with database, also can send warning message through computer network, thereby; Can put into practice the integrated application of multi-door computer studies, the comprehensive application ability of check knowledge.
" Ministry of Education is about some suggestions of comprehensive raising higher education quality " (high [2012] No. 4 of religion) the 8th proposition of file " strengthened and put into practice the link of cultivating talent ", and the 9th proposition will " strengthen innovating start an undertaking education and careers guidance service ".But enterprise recruits less than the computer supervisory control system research and development talent that engineering experience is arranged on the one hand, and colleges and universities are because the equipment insufficient investment also is difficult to cultivate the computer supervisory control system research and development talent on the other hand.The analog quantity input and switching value output emulation module (hereinafter referred emulation module) that utilize method provided by the invention to design; Can be used for zero cost (except the serial communication cable) builds computer supervisory control system simulating developer platform at the computer house of colleges and universities; In order to the core technology of practice and study computer supervisory control system, thus effectively improve the student put into practice technical ability and employment rate.
Summary of the invention
The invention has the beneficial effects as follows that compare with module in kind, the effect of visualization of emulation module is better; Its major technique is characterized as: the emulation module serviceability temperature is as analog quantity; During the output switch closure, exhibit red line between two terminals of output switch, circuit is connected; Heating lamp is bright, and this moment, temperature rose automatically; The output switch opens is then hidden red line, and circuit breaks off, and heating lamp goes out, and this moment, temperature descended automatically; During temperature variation, represent that to upward arrow temperature rises with red on the temperature sensor next door, represent that with blue arrow downwards temperature descends, the arrow next door shows 16 system Temperature numerical; Communication protocol and explanation thereof are shown in the main interface of emulation module, need not to consult instructions, and support several data verification mode (module in kind is generally only supported a kind of verification mode); The data that emulation module receives and sends directly are shown in the main interface of emulation module; The beat unification of the address of RS-232 Interface status, emulation module and temperature sensor numerical value change shows with status bar.
Description of drawings
Fig. 1 is the abstract model of the emulation module that designs of the present invention;
Fig. 2 is the communication protocol of the emulation module that designs of the present invention;
Fig. 3 is the visualizing application software model of the emulation module that designs of the present invention.
Embodiment
Fig. 1 is the abstract model of emulation module, and " module represent district " at Fig. 3 shows as a setting, is used for the module of artificial actual, and adds the dynamic and visual effect.Fig. 1 the latter half connection terminal function from left to right is followed successively by: S2+ is connected temperature sensor 2 with S2-, and S1+ is connected temperature sensor 1 with S1-, Vs+ and Vs-link block power supply, and GND is a module ground connection; Fig. 1 the first half connection terminal function from left to right is followed successively by: OUT1 is connected output switch 1 with COM1; OUT0 is connected output switch 0 with COM0, Tx, Rx and GND are the splicing ear of the transmission pin of RS-232 interface, the splicing ear and the ground wire of reception pin.
The state of two output switches is controlled through the communication protocol shown in Fig. 2; When the output switch closure; Between pair of output (like OUT1 and COM1), show a red line; Form an active circuit loop, corresponding simultaneously heating lamp bright (at the position display red light picture of this loop heating lamp); Otherwise, hide connecting the red line between the lead-out terminal, circuit breaks off, heating lamp go out (hiding the red light picture).
A text box is placed on each temperature sensor (temperature sensor that is connected down like S2+ and S2-terminal) next door, is used for numerical value with 16 system form displays temperature sensors, and this numerical value need pass through conversion could represent actual temperature; Place an arrow again,, just represent ascendant trend to upward arrow,, just represent downtrending with blue arrow downwards if temperature descends with red if temperature rises.The S1 temperature sensor is corresponding with OUT0 output switch, and the S2 temperature sensor is corresponding with OUT1 output switch.If corresponding heating lamp is bright, then the numerical value in the text box rises (being 0xFF to the maximum), simultaneously the exhibit red arrow; Otherwise numerical value descends (minimum is 0), shows blue arrow.
Power supply (Power) pilot lamp is red, and this moment, the RS-232 interface was closed, and emulation module is not worked; Click power light, green by red stain, this moment, the RS-232 interface was opened, and when emulation module is received the control command that main control computer sends, upgraded the state of output switch, simultaneously the numerical value of temperature sensor was adjusted; When emulation module is received querying command, then return the numerical value of temperature sensor and the state of output switch.Emulation module is not worked or when idle, Rx and Tx pilot lamp are redness, and when receiving data, the Rx pilot lamp turns green, and during the transmission data, the Tx pilot lamp turns green.
Fig. 2 is the communication protocol of operational simulation module, shows in Fig. 3 " protocol description district ".The identical leading character of the general employing of the module of same type, EOT is a special ascii character (0x04), often is used as control character, the emulation module here adopts EOT as leading character.
The I/O module that computing machine connected is many; CPU is in order to communicate with each other with the module that is connected; Must a numbering be set to module, thereby CPU can be linked up through the unique numbering of each module and this module, this numbering is exactly the address; Represent that with ID the address takies a byte.
Function code mainly comprises to be read function code (representing with RD) and writes function code (representing with WT).RD representes (0x52) that with character " R " WT (0x57) representes with character " W ".Because the state of this emulation module is less, so, need not to be provided with the internal data address that emulation module is read and write.
BCC (Block Check Code) is the data block check code, and several kinds of Xor, Add, CRC, CheckSum are generally arranged.Xor and Add be respectively XOR with add up with, account for the length of a byte; CRC and CheckSum are respectively the employed supplement check codes that adds up in CRC and the TCP/IP protocol family, account for two bytes respectively.Emulation module provides this 4 kinds of data block verification modes, and check code is optional.
Many modules indicate EM (End Message) with carriage return CR (0x0d) as ending; And the TCP/IP protocol family is (like HTTP; POP3 etc.) adopt CRLF (0x0d0a) as the ending sign morely; Emulation module provides these two kinds ending signs, and is same, and the ending sign also is optional.
Represent switch closure with 1, represent switch opens with 0.Emulation module has 2 switching value output DO (Digital Output), thereby, can use 1 its state of byte representation, wherein, does not use this position of " * " expression.
Can know that according to above design and analysis read the bidding protocol (Read also is a querying command) of emulation module state, wherein, the scope of ID is 1 to 255, can be provided with that like this, a main control computer can connect nearly 255 emulation modules by program.The kind of BCC and EM also can be provided with by program as required.
Emulation module read response protocol (Reply); Wherein, " STX " (Start of message, 0x02) expression begins main control computer is responded, and " DT1 " representes the numerical value of first temperature sensor; The numerical value of second temperature sensor of " DT2 " expression, the state of two output switches of minimum two (other are invalid) expression in " DO ".BCC calculates according to the check code kind that adopts, and whole agreement generates automatically and sends response to main control computer.For the misdata bag that main control computer sends, emulation module is all ignored, and does not respond.
Write order agreement (Write also is a control command), for the data (being DO) of 1 byte that writes, have only last two effectively.Here, write order is not provided with response protocol.
Fig. 3 is the visualizing application software model of emulation module, and " function button district " arranged system that button and bolt down procedure button are set.System is provided with parameters such as port numbers that the RS-232 interface mainly is set and baud rate; And the communication protocol of operational simulation module, comprise address code, check code, terminating code, the temperature sensor time that beat experienced of emulation module and the stride of variation.If the time of a beat is 2 seconds, changing stride is 5, and when then representing certain output switch closure, the numerical value of 2 seconds corresponding temperature sensors of every mistake increases progressively 5, and vice versa.
" Data Receiving district " shows the raw data packets of the main control computer transmission that receives, and shows with the byte form; The corresponding response packet that " data response district " then sends for emulation module also shows with the byte form.In addition, also be provided with status bar, be used for showing RS-232 Interface status and parameter, and the beat and the stride of the address of emulation module, temperature sensor numerical value change.
Utilize the emulation module of this visualizing application software modelling; Easy to use; Dynamic effect is good, and the data homogeneous order of numerical value, data transmit-receive state and the transmission of the address of emulation module, RS-232 Interface status, output on off state, temperature sensor is clear.Compare with module in kind, need not the physical connection of power supply and peripheral circuit, also need not signal generator and multimeter and produce simulating signal and measurement switch state; For communication protocol; Also need not to browse handbook, still, data communication but has identical effect with module in kind with processing.
Claims (2)
1. the emulation mode of analog quantity input and switching value output module utilizes the output switch of the emulation module that this method designs to be controlled by main control computer, and the state of output switch and the numerical value of input analog amount can be inquired about by main control computer.
2. according to the described emulation module of claim 1, it is characterized in that: emulation module need not hardware cost, and communication protocol is directly in the main interface display of emulation module, need not to browse handbook; The data of the state of the address of emulation module, RS-232 Interface status, output switch, numerical value, data transmit-receive state and the transmission of input analog amount are all in emulation module master interface display, and data communication but has identical effect with module in kind with processing.
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| US6308224B1 (en) * | 1996-03-29 | 2001-10-23 | International Business Machines Corporation | Method of generating an implementation of a workflow process model in an object environment |
| EP1168117A1 (en) * | 2000-06-21 | 2002-01-02 | ALSTOM Power N.V. | Method for presenting and processing of process flows and computer programm for simulating the same |
| CN101557102A (en) * | 2009-05-15 | 2009-10-14 | 江苏省电力公司金湖县供电公司 | General-purpose simulation device for microcomputer protection |
| CN101867192A (en) * | 2009-12-24 | 2010-10-20 | 浙江省电力试验研究院 | Reactive compensation control simulation test system |
| CN202049353U (en) * | 2011-01-28 | 2011-11-23 | 金华职业技术学院 | Virtual measurement and control system for electric car |
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2012
- 2012-05-13 CN CN2012101459557A patent/CN102636997A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| GB2295480A (en) * | 1994-11-25 | 1996-05-29 | Drilling Syst Ltd | Well control simulation system |
| US6308224B1 (en) * | 1996-03-29 | 2001-10-23 | International Business Machines Corporation | Method of generating an implementation of a workflow process model in an object environment |
| EP1168117A1 (en) * | 2000-06-21 | 2002-01-02 | ALSTOM Power N.V. | Method for presenting and processing of process flows and computer programm for simulating the same |
| CN101557102A (en) * | 2009-05-15 | 2009-10-14 | 江苏省电力公司金湖县供电公司 | General-purpose simulation device for microcomputer protection |
| CN101867192A (en) * | 2009-12-24 | 2010-10-20 | 浙江省电力试验研究院 | Reactive compensation control simulation test system |
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Application publication date: 20120815 |