CN2480912Y

CN2480912Y - Electronic label read/write device

Info

Publication number: CN2480912Y
Application number: CN 01239435
Authority: CN
Inventors: 王洁民; 徐鹤森; 顾啸; 孙忆
Original assignee: Shanghai Hsic Application System Co ltd
Current assignee: Shanghai Hsic Application System Co ltd
Priority date: 2001-05-18
Filing date: 2001-05-18
Publication date: 2002-03-06
Anticipated expiration: 2011-05-18

Abstract

The utility model provides an electronic label read/write device. Compared with the prior art which only provides one serial port, the utility model is mainly characterized in that: the utility model is also provided with one interface at least; the interface is a PS/2 keyboard interface or a USB interface, or simultaneously provided with a PS/2 keyboard interface and a USB interface, thereby extending the application range of the utility model, making the keyboard interface obtain the necessary working electrical source and providing a feasible selection for utilizing a plurality of advantages of USB.

Description

Electronic label read/write

The utility model relates to the read-write equipment of numerical information, refers to a kind of device that electronic tag is carried out the numerical information read-write by the noncontact mode especially.

The use of antifalsification label is very universal.At present, the antifalsification label of commodity employing mainly contains bar code and laser tag.The laser anti-counterfeit label needs to observe with eyes, and no specific instrument detects, and is accurate inadequately.And the application time of bar-code label is very long, and technical do not had secret to say, copys very easy.In addition, the identification of bar code is by optical mode, because the rectilinear propagation of light, so not only decipherment distance there is strict restriction, and also have very strong direction requirement.

The new electronic tag that is born, usually form by a radio frequency chip, antenna, self-adhesive paper etc., carrier as a kind of information, therefore information wherein do not have strict requirement to direction by the electromagnetic wave transmission, and operating distance is also long, and be not subjected to the influence of barrier, can be placed in the inside of commodity packaging, unlike bar code, must be imprinted on the outside, thereby increase confidentiality.There is microcontroller electronic tag inside, adopts different frequency of operation, different information coded formats, and different modulation systems makes to have only by specific read-write facility and just can read its inner information.Therefore, in commodity, for example add an electronic tag in train ticket, the plane ticket, its anti-fake effect is significant.

From principle of work, electronic tag is the product that REID and IC-card technology combine.REID originates from the mid-80, compares with bar code, magnetic stripe, and that REID has is contactless, operating distance is big, precision is high, series of advantages such as fast and comparatively adapting to applied environment is handled in information gathering.Consult Fig. 1, a typical radio-frequency recognition system is made up of two parts, and the one, be called as the transponder of radio frequency identification marker, the 2nd, pager, wherein the major part of pager is a transceiver; Inductive coil (antenna) is housed in transponder and is used to store the storer that relevant application table is shown information.Its course of work comprises: pager is launched wireless pumping signal and relevant interrogating signal; Transponder enters the perform region of corresponding pager, and paged device signal excitation is also launched answer signal; Pager is accepted the answer signal of transponder, and is for further processing.

Popular electronic label read/write on the present market, no matter what outward appearance is, its basic structure and principle are roughly the same.Figure 2 shows that market has electronic label read/write logical organization block diagram now, its groundwork process is as follows:

1. crystal oscillator provides the sinusoidal carrier signal of certain frequency, launches by coil antenna.

2. electronic tag receives carrier signal, and according to the information that oneself will return, the modulator approach modulated carrier signal with different returns to the read-write facility.

3. read write line is accepted part with the modulation signal that receives, through amplification, filtering, demodulation.

4. chip microprocessor, with the information and the result that receive, (COM) passes to main frame through serial line interface, by the host monitor operating result.

But general electronic label read/write often only provides a serial line interface to link to each other with main frame at present.Because present computer, microcomputer particularly, with serial line interface limited, be generally two (COM1, COM2), and modulator-demodular unit (MODEM) or mouse (MOUSE) all will take serial port, so may run into the situation that no serial ports is used, promptly enable to connect serial ports, also hindered the ability of microcomputer continuation extended serial peripheral hardware.In addition, serial ports can't provide power supply, so such electronic label read/write also need connect the variable-voltage power supply input in addition, both has been inconvenient to use, and has improved cost again.

The purpose of this utility model provides a kind of above-mentioned defective that can overcome prior art, has the electronic label read/write that is connected with the many interfaces of host computer.

For achieving the above object, the utility model provides a kind of electronic label read/write, and this electronic tag stores numerical information, and this read write line comprises: crystal oscillator produces oscillator signal; Frequency division and amplifier carry out frequency division and amplification to oscillator signal, produce required carrier signal; Antenna, the emission carrier signal is also accepted through the electronic tag modulated digital signal; Envelope detected, filter amplifier, microprocessor and the serial line interface that links to each other with host computer is characterized in that it also comprises the interface that at least one links to each other with host computer.Described at least one interface is the PS/2 keyboard interface, or USB interface, or both, wherein,, can realize and being connected of host computer by patchplug for the PS/2 keyboard interface; In addition, the utility model also further comprises the circuit block of anti-signal conflict.

The utility model provides a plurality of interfaces to link to each other with host computer, therefore makes the user transmit result or accept the order that main frame sends by different interfaces according to actual needs; Because by patchplug, thus the PS/2 keyboard fully not can with the read write line conflict, and because the self-powered output of keyboard interface not only need not to connect in addition power supply, even when using standard serial port, also need not the peripheral hardware power supply; In addition, utilize USB interface, utilize the user of USB plurality of advantages, more provided a kind of practicable selection for hope.

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.

Fig. 1 is the radio-frequency recognition system theory diagram.

Fig. 2 is existing electronic label read/write structured flowchart.

Fig. 3 is the utility model electronic label read/write structured flowchart.

Fig. 4 is that the utility model electronic label read/write and main frame pass through the RS-232 interface connection diagram.

Fig. 5 is that the utility model electronic label read/write and main frame pass through keyboard PS/2 interface connection diagram.

Fig. 6 is that the utility model electronic label read/write and main frame pass through the USB interface connection diagram.

Fig. 7-the 8th, the utility model electronic label read/write schematic circuit.

Consult Fig. 3, Fig. 7-8, the utility model electronic label read/write comprises crystal oscillator, frequency division and signal amplifier, antenna, envelope detector, filtering amplification and reshaper and microprocessor.As shown in the figure, the crystal oscillator Y1 of 4MHz provides clock signal on the one hand microprocessor U7 (PIC16F84), on the one hand then through 16 binary counter U6 (74HC4060), four frequency divisions, produces the low frequency carrier signal signal of 125kHz.This carrier signal is amplified by U4 (ICL7667), Q1 (IRF9520), Q2 (IRF740), launches via aerial coil L1 then.Obviously, the resonant tank by L1 (162 μ H) and C22 (0.01 μ f) form produces resonance at 125kHz Frequency point place, amplify the carrier signal that transmits thereby make through Q1 and Q2, obtains maximum power output.In addition, the impedance of resonant tank should be as far as possible little, so that the strength of current maximum of aerial coil, the magnetic flux density that coil produced also reaches maximum.

Through the carrier signal that wireless coil is sent, make the interior coil of the used electronic tag of the utility model produce induction and obtain energy, thereby activate its inner microcontroller.This microcontroller is according to the user profile that is stored in binary zero, " 1 " form in the inner ROM of electronic label chip, the carrier signal that receives is modulated, for example by FSK (frequency shift keying) mode, carrier signal is carried out different frequency division (8 frequency divisions or 10 frequency divisions) come modulated carrier signal, and launch by antenna.

Through the signal of electronic tag modulation, for aerial coil L1 receives, and carry out envelope detected by the low pass detecting circuit that D8 and C26 form, detect the envelope sinusoidal signal of different frequency, promptly represented different " 0 " or " 1 ".Envelope signal by U10A, U10C, U10D step by step filtering amplify, be input to voltage comparator U10B, the pulse code signal of its output enters into the RB4 pin of microprocessor U7 (PIC16F84), by microprocessor to signal decoding and deal with.

Consult Fig. 3-6, the utility model electronic label read/write provides multiple interfaces to link to each other with host computer, thereby makes the user transmit result by distinct interface according to actual needs, accepts the order that main frame sends.

What Fig. 4 showed is the synoptic diagram that links to each other with host computer by standard RS-232 serial ports.Because the application of standard serial port is very common, need not to add to give unnecessary details.Should be noted that because the utility model also provides following other interfaces that will describe in detail, thereby make the utility model when using standard serial port, do not need as usually, will connect power source special in addition.

What Fig. 5 showed is the synoptic diagram that links to each other with host computer by the PS/2 keyboard interface.Because the utility model adopts data layout and the main-machine communication identical with keyboard, so the keyboard interface circuit of main frame can receive the data that the utility model read write line passes over, and by rewriting microprocessor INT9 interruption in the keyboard, just can make it go out information or read write line information respectively, thereby be handled respectively from keyboard.When implementing, can connect by patchplug (scheming not show), keyboard fully not can with the read write line conflict.Because therefore the self-powered output of keyboard interface need not to connect in addition power supply,, also can obtain necessary working power from the keyboard mouth even when selecting above-mentioned standard serial port for use.In addition, by multi-tap, also can connect the peripheral hardware that other use the PS/2 interface.

What Fig. 6 showed is the synoptic diagram that links to each other with host computer by USB interface.USB is the universal serial bus structural of Intel company's exploitation, is in order to overcome the shortcoming of conventional I/O pattern, and as occupying system resources, it is more high to lack dirigibility and cost.USB is connected by the built-in system data line of pci bus and PC, realizes the transmission of data.USB is again a kind of communication protocol simultaneously, supports that the data between main system and the peripherals transmit.Obviously, USB has many advantages, for example, and for peripheral hardware provides the single standard connection type; Whole USB system has only a port and interruption, has saved system resource; USB supports hot plate, promptly can plug or disconnect USB device or the like safely under the situation of not shutting down.Therefore, the USB interface that the utility model provides does not only have serial port to use to those, and keyboard interface is not the user of PS/2, a kind of optional approach is provided, and concerning those want to utilize the user of USB plurality of advantages, more provides a kind of practicable selection.

Fig. 3 and Fig. 7-8 shows that also the utility model read write line has anti-collision function.Generally, electronic label read/write is once only handled the information of a label, if within the working range of read write line, several electronic tags is arranged simultaneously, and the data message of receiving so just may get mixed up.For addressing this problem, the utility model read write line is provided with anti-collision logic and handles contingent conflict.In case conflict produces, collision signal is input to the RB6 pin of microcontroller U7 by U8, U5, and the switch by RB1 foot control system aerial coil L1, generation by certain frequency Interrupted Carrier Wave, thereby logic according to its inside, produce certain sequencing, one by one signal to electronic label read/write.Though from essence, electronic tag of single job, but from acting on, in the short time, " simultaneously " operated the several electrons label, so that the utility model product is specially adapted to circulation is bigger, the comparison crowded places.

Claims

1. electronic label read/write, this electronic tag stores numerical information, and this read write line comprises:

Crystal oscillator produces oscillator signal;

Frequency division and amplifier carry out frequency division and amplification to oscillator signal, produce required carrier signal;

Antenna, the emission carrier signal is also accepted through the electronic tag modulated digital signal;

Envelope detected, filter amplifier, microprocessor and the serial line interface that links to each other with host computer is characterized in that it also comprises the interface that at least one links to each other with host computer.

2. electronic label read/write according to claim 1 is characterized in that, this at least one interface is the PS/2 keyboard interface.

3. electronic label read/write according to claim 2 is characterized in that it also comprises the USB interface that links to each other with host computer.

4. according to claim 2 or 3 described electronic label read/writes, it is characterized in that, link to each other with host computer PS/2 keyboard by patchplug.

5. electronic label read/write according to claim 1 is characterized in that, this at least one interface is a USB interface.

6. electronic label read/write according to claim 5 is characterized in that, also comprises the PS/2 keyboard interface that links to each other with host computer.

7. electronic label read/write according to claim 6 is characterized in that, links to each other with host computer PS/2 keyboard by patchplug.

8. according to claim 1,2 or 5 described electronic label read/writes, it is characterized in that, also comprise the circuit block of anti-signal conflict.