CN101303793A - Bus type digital instrument - Google Patents
Bus type digital instrument Download PDFInfo
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- CN101303793A CN101303793A CNA2007100721819A CN200710072181A CN101303793A CN 101303793 A CN101303793 A CN 101303793A CN A2007100721819 A CNA2007100721819 A CN A2007100721819A CN 200710072181 A CN200710072181 A CN 200710072181A CN 101303793 A CN101303793 A CN 101303793A
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Abstract
The invention discloses a bus type digital meter. A present meter can carry out communication with a host computer, such as a computer, and the like, through a serial bus interface, and transmits data to a bus (a computer, and the like), but can not receive or read the data directly from the bus (the computer, and the like), that is, the serial bus interface of the present meter is a communication output interface, and the meter can not directly input and read serial bus data; therefore, one bus type digital meter is needed, which consists of a serial bus input interface, a single chip microcomputer, a digital display, a digital decoder, an address matcher, a digital memory, a controlling keyboard, a power supply and an output interface. The product of the invention is used for a digital control system.
Description
Technical field:
The present invention relates to a kind of intelligence instrument, be specifically related to a kind of bus type digital instrument of universal serial bus input mode.
Background technology:
Mainly at analog quantity, pulsed quantity, the design of switching value input signal, along with the development of control mode, existing input mode can't adapt to the demand for development of Digitizing And Control Unit to existing read out instrument.Existing instrument has two kinds by the bus interface classification: number bus interface and nil bus interface are arranged, the existing instrument of nil bus interface can't directly be connected use with bus-organized system, and the input mode that the existing instrument of number bus interface is arranged is analog quantity input, pulsed quantity input and switching value input: as thermopair, thermal resistance, current signal, voltage signal and square-wave pulse etc.Existing instrument is passed through the communication of host computers such as its serial bus interface and computing machine, and transfers data to bus (computing machine etc.), but can not directly receive or reading of data from bus (computing machine etc.).That is, its serial bus interface is the communication output interface, and instrument can't directly be imported and read the universal serial bus data.
The characteristics of existing instrument read the universal serial bus data because existing instrument can't directly be imported, and cause following problem in actual applications:
The input mode of existing instrument is analog quantity input, pulsed quantity input and switching value input: as thermopair, thermal resistance, current signal, voltage signal and square-wave pulse etc., can't directly import and receive the universal serial bus data,
The input mode of existing instrument is in the effective accuracy scope, and transmission range is shorter.When importing data transmission at a distance, the big and even distortion of error, under the prerequisite of not considering power supply, every instrument needs one two core shielded cable transmission input data signal at least, when instrumentation quantity more for a long time, need a large amount of cables, not only cause the increase of cable expense, and produce a large amount of engineering costs thus, also be not easy to safeguard simultaneously in the future.
In order to import the data of digital device outputs such as receiving computer, the general mode that adopts " computing machine+code converter+analog quantity conversion equipment+instrument "; Promptly, the data of computing machine (digital output device) output convert serial bus signal to by code converter, be transferred to digital module (D/A) again, digital module becomes simulating signal to input to existing instrument this conversion of signals again, instrument is a digital signal in the demonstration of the enterprising line number word of instrument by table internal mold digital-to-analogue piece (A/D) with analog signal conversion again etc., existing method is the expense height not only, and multiple conversions causes precise decreasing.
Summary of the invention:
The purpose of this invention is to provide a kind of realization universal serial bus data and directly import, can a plurality ofly be connected in parallel on (only needing one a) serial data bus, and table receives the data that read separately separately by this universal serial bus, the bus type digital instrument of working voluntarily.
Above-mentioned purpose realizes by following technical scheme:
A kind of bus type digital instrument, its composition comprises: the universal serial bus input interface, single-chip microcomputer, digital indicator, digital decoder, address matcher, number storage, supervisory keyboard, power supply and output interface are formed, described universal serial bus input interface directly connects data bus, the bus type numeral receives by this interface and reads bus data, described Single-chip Controlling other parts are carried out data read, handle, show, output etc., described digital indicator shows the data that received, described digital decoder is decoded to the universal serial bus data of input, isolate address signal and data-signal, described address matcher compares the address signal of isolated address signal of digital decoder and the setting of this instrument, and affiliated number storage is stored this address data-signal; Described supervisory keyboard is used for the setting of instrument parameter, function, described output interface output analog quantity, switching value signal.
Above-mentioned bus type digital instrument, bus signals passes through interface circuit, after two resistance, enter bus transceiving chip 3082, signal Processing is after 1 pin, 4 pin are sent into CPU 89C51, this chip is the core cell of this instrument, signal is finished decoding at the 89C51 chip internal, separate address date and signal data, and the raw address data among its address date and the storer 24C02 are compared, specified data effectively back compares with the alerting signal that is set among the 24C02,15 pin by 89C51,16 pin output alarm signals, through the output of reporting to the police of light idol buffering rear drive relay, the data-signal that decoding obtains through 89C51 is through the output of 21 pin and enter 74HC164, sending into corresponding charactron after decoding drives shows, data-signal is through 32～39 outputs of 89C51 pin and enter DAC0832D/A, and convert simulating signal to, last LM324 buffering outputting standard current signal, SW1, SW2, SW3 is a keyboard input devices, be used for the setting of parameter and alarming value, power unit for whole instrument provide ± 15V and+power supply of 5V.
This technical scheme has following beneficial effect:
1. instrument of the present invention can realize that the universal serial bus data directly import, and can a plurality ofly be connected in parallel on (only needing one a) serial data bus, and table receives the data that read separately separately by this universal serial bus, works voluntarily.
2. instrument of the present invention has analog quantity, switching value output interface, has supervisory keyboard, is used for the setting of instrument.
3. applied range of the present invention is suitable for the Industry Control with various different serial bus protocols, and is multiple functional, can the data of various serial bus protocols be shown that output is sent in analog quantity, switch quantitative change.
4. the system architecture that bus type instrument of the present invention constitutes is succinct, expansion is convenient, cost performance is high.The bus type instrument display system has omitted D/A, A/D modular converter, can greatly save the cost of system.
5. the invention enables communication process to remove many unnecessary intermediate links, reduced a large amount of possible breakdown nodes, compare with existing analog input instrument, bus type digital instrument has greatly improved stability.
Description of drawings:
Accompanying drawing 1 is the structured flowchart of this product;
Accompanying drawing 2 is electrical schematic diagrams of this product.
Accompanying drawing 3 is the structural representation of this product;
Accompanying drawing 4 is rear end terminal structure figure;
Accompanying drawing 5 is the panel structure chart of this product.
Accompanying drawing 6 is the unit module graph of a relation of this product.
The specific embodiment of the present invention:
Embodiment 1:
The present invention is the bus type digital instrument of a monomer, is provided with the universal serial bus input interface on the table body.
The present invention forms and comprises: have the universal serial bus input interface and connect by table body and master control borad, the bus type instrument is connected to form through circuit by three pcb boards, is respectively display board, power panel and master control borad 1, and power panel 2 and master control borad couple together by display board 3.
The table body is made up of universal serial bus input interface, single-chip microcomputer, digital indicator, digital decoder, address matcher, number storage, supervisory keyboard, power supply and output interface.The universal serial bus input interface directly connects data bus, realizes the direct input of bus data;
The universal serial bus input interface directly connects data bus, and the bus type numeral receives by this interface and reads bus data; Single-chip microcomputer is the control core of instrument, and the control other parts are carried out data read, processing, demonstration, output etc.; Digital indicator shows the data that received; Digital decoder is decoded to the universal serial bus data of input, isolates address signal and data-signal; Address matcher compares the address signal of isolated address signal of digital decoder and the setting of this instrument, so that determine the data of this address; Number storage is stored this address data-signal; Supervisory keyboard is used for the setting of instrument parameter, function; Output interface output analog quantity, switching value signal.
Bus signals enters bus transceiving chip 3082 by interface circuit after two 18 Ohmages, signal Processing is after 1 pin, 4 pin are sent into CPU 89C51, and this chip is the core cell of this instrument.Signal is finished decoding at the 89C51 chip internal; separate address date and signal data; and the raw address data among its address date and the storer 24C02 are compared; specified data effectively back compares with the alerting signal that is set among the 24C02; 15 pin, 16 pin output alarm signals by 89C51; through the output of reporting to the police of light idol buffering rear drive relay; two diodes are for protecting the effect of light idol; the data-signal that decoding obtains through 89C51 is through the output of 21 pin and enter 74HC164, sends into corresponding charactron and show after decoding drives.Data-signal is through 32～39 outputs of 89C51 pin and enter DAC0832D/A, and converting simulating signal to, last LM324 buffering outputting standard current signal is used for change and send output, control, SW1, SW2, SW3 are keyboard input devices, are used for the setting of parameter and alarming value.Power unit for whole instrument provide ± 15V and+power supply of 5V.
The bus type instrument is carried out System self-test after start, enter the system default parameter state after the self check, and the user sets at the enterprising line parameter of keyboard, enters duty automatically after setting is finished.The bus type instrument receives the decoding of the laggard line data of data, isolates address signal and data-signal, when address signal and storage inside address are inconsistent, represents that these data are invalid data, then the automatic return data accepting state of instrument.When the address data are consistent with the storage inside address, represent that these data are valid data, then this data transmission to number storage is stored, carry out digitizing simultaneously and show, and export analog quantity, switching value as required.
The present invention also can export the data of computing machine by the serial data mouth, convert the standard serial bus data to through code converter, transfers to each bus type instrument by universal serial bus again, the direct video data of bus type instrument, and export external control as requested.
Former industrial instrument carries out the scene with the simulating signal that receives and shows, transfers to control center by universal serial bus simultaneously.The video data of former industrial instrument is shown with instrument in other position, only need the serial bus interface of bus type instrument is connected on the former universal serial bus, set the baud rate of instrument, the address can directly show after the parameters such as agreement.
Claims (2)
1. bus type digital instrument, its composition comprises: the universal serial bus input interface, single-chip microcomputer, digital indicator, digital decoder, address matcher, number storage, supervisory keyboard, power supply and output interface are formed, it is characterized in that: described universal serial bus input interface directly connects data bus, the bus type numeral receives by this interface and reads bus data, described Single-chip Controlling other parts are carried out data read, handle, show, output, described digital indicator shows the data that received, described digital decoder is decoded to the universal serial bus data of input, isolate address signal and data-signal, described address matcher compares the address signal of isolated address signal of digital decoder and the setting of this instrument, and described number storage is stored this address data-signal; Described supervisory keyboard is used for the setting of instrument parameter, function, described output interface output analog quantity, switching value signal.
2. bus type digital instrument according to claim 1, it is characterized in that: bus signals passes through interface circuit, after two resistance, enter bus transceiving chip 3082, signal Processing is after 1 pin, 4 pin are sent into CPU89C51, this chip is the core cell of this instrument, signal is finished decoding at the 89C51 chip internal, separate address date and signal data, and the raw address data among its address date and the storer 24C02 are compared, specified data effectively back compares with the alerting signal that is set among the 24C02,15 pin by 89C51,16 pin output alarm signals, through the output of reporting to the police of light idol buffering rear drive relay, the data-signal that decoding obtains through 89C51 is through the output of 21 pin and enter 74HC164, sending into corresponding charactron after decoding drives shows, data-signal is through 32～39 outputs of 89C51 pin and enter DAC0832 D/A, and convert simulating signal to, last LM324 buffering outputting standard current signal, SW1, SW2, SW3 is a keyboard input devices, be used for the setting of parameter and alarming value, power unit for whole instrument provide ± 15V and+power supply of 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100721819A CN101303793A (en) | 2007-05-09 | 2007-05-09 | Bus type digital instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100721819A CN101303793A (en) | 2007-05-09 | 2007-05-09 | Bus type digital instrument |
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| Publication Number | Publication Date |
|---|---|
| CN101303793A true CN101303793A (en) | 2008-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100721819A Pending CN101303793A (en) | 2007-05-09 | 2007-05-09 | Bus type digital instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104820394A (en) * | 2015-03-17 | 2015-08-05 | 中冶东方工程技术有限公司 | System for driving multivariable instrument by use of PLC digital output module |
| CN106597917A (en) * | 2016-11-02 | 2017-04-26 | 武汉智明力强光电系统有限公司 | Intelligent industrial control instrument suitable for integrated signal management |
-
2007
- 2007-05-09 CN CNA2007100721819A patent/CN101303793A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104820394A (en) * | 2015-03-17 | 2015-08-05 | 中冶东方工程技术有限公司 | System for driving multivariable instrument by use of PLC digital output module |
| CN104820394B (en) * | 2015-03-17 | 2017-12-15 | 中冶东方工程技术有限公司 | With the system of PLC digital output modules driving multivariable instrument |
| CN106597917A (en) * | 2016-11-02 | 2017-04-26 | 武汉智明力强光电系统有限公司 | Intelligent industrial control instrument suitable for integrated signal management |
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Open date: 20081112 |