CN102984823A - Multifunctional management system of mobile terminal of internet of things - Google Patents
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Abstract
The invention discloses a multifunctional management system of a mobile terminal of internet of things. The multifunctional management system comprises a radio frequency identification device (RFID) electronic tag, or an identification (ID) number of an integrated circuit (IC) card, or data, bar code information, image information and global position system (GPS) positioning location information stored in a tag, the data and the information are exchanged with a background server through a wireless or wired communication method, and obtained results are displayed on a handheld terminal for man-machine interaction. By means of the multifunctional management system, the ultrahigh frequency RFID reading and writing technology, the near field communication (NFC) technology, the third generation telecommunication (3G) comprehensive wireless communication technology, the random delay mechanism anti-collision algorithm, the purchase secure accesses module (PSAM) data encryption algorithm and the like are integrated, and an RFID intelligent terminal of the Internet of Things is researched and developed, wherein the RFID intelligent terminal has multiple functions of intelligent control, ultrahigh frequency RFID reading and writing, multiple communication methods, real-time interference resistance, GPS global positioning, barcode scanning, data encryption and the like. The problems that an existing mobile terminal of the Internet of Things is short in reading and writing distance, low in anti-interference ability, low in work grade, not suitable for industrial severe application environment, low in wireless communication speed, poor in man-machine interaction and the like are solved.
Description
Technical field
The present invention relates to the frequent RFID intelligent terminal of a kind of superelevation administrative skill field, be specifically related to a kind of multifunctional management system of Internet of Things portable terminal.
Background technology
Current Internet of Things portable terminal ubiquity control model falls behind, wireless telecommunications speed is slow, the defectives such as the RFID reading/writing distance is short, anti-interference is low, man-machine interaction is poor, industrial protection rank difference.
Summary of the invention
The objective of the invention is the problem and shortage for the prior art existence, a kind of multifunctional management system of Internet of Things portable terminal is provided.
Technical scheme: the multifunctional management system of Internet of Things portable terminal, comprise RFID electronic tag or IC-card ID number or label in data, bar code information, image information, the GPS positioning position information of storing, these information exchanges are crossed wireless or wired communication modes and background server carries out exchanges data, the result who obtains is shown for man-machine interaction at handheld terminal.Wherein RFID (Radio FrequencyIdentification) is radio-frequency (RF) identification.Described handheld terminal comprises shell, be fixed with in the enclosure mainboard, be provided with display module and display screen on the mainboard, also be provided with operation interface and external-connected port on the mainboard, and be arranged at this enclosure and with described display screen, the control circuit that operation interface is connected with external-connected port, it is characterized in that, described control circuit comprises microprocessor, and the ultrahigh frequency RFID read/write circuit module that is connected with this microprocessor respectively, power management module, memory, the PSAM encryption chip, the 3G wireless communication module, the bar code module, the 2D/3D figure accelerates and the video code and decode module.
Described operation interface comprises the operation interface that is connected with microprocessor and the interface of reading that is connected with the bar code module.Described external-connected port comprises the USB interface that is connected with the USB administration module, the Ethernet interface that is connected with ethernet module, the power interface that is connected with power management module, the code reader that is connected with the bar code module and is connected with the safe card reading module of SIM card and sim card slot with microprocessor.Power management module is connected with battery with microprocessor, and battery is connected with charging inlet by charge management module.Described external-connected port also comprises GPS module and the fingerprint module that is connected with microprocessor.
Described ultrahigh frequency RFID read/write circuit module, comprise coding module, decoding module, CRC module and clock frequency division module, clock module is connected with the CRC module controls with coding module, decoding module control respectively, coding module is connected with decoding module with the CRC module data and is connected, and the CRC module is connected with the antenna radio-frequency module.
Described 3G wireless communication module comprises emission system and accepts system; Wherein emission system comprises that master controller, frequency mixer, blender, band pass filter, power amplifier circulator be connected with antenna and connect, and the baseband signal end of master controller directly is connected with blender; In the receiving system, the inverse signal of label is connected with power amplifier by filter, power amplifier is connected with power divider, two outputs of power divider are connected with differential amplifier circuit with filter by demodulator respectively, differential amplifier circuit, comparator are connected with shaping circuit and are connected, being connected with the coding and decoding circuit of the output of shaping circuit.
Described power management module, comprise inductance resonant network, full-wave rectifying circuit, amplitude limit fixed amplitude circuit and voltage stabilizing regulating circuit, wherein two of the inductance resonant network outputs are connected with the input of full-wave rectifying circuit respectively, being connected with the amplitude limit fixed amplitude circuit of simultaneously these two outputs, the power end of described full-wave rectifying circuit output is connected with two inputs of voltage stabilizing regulating circuit respectively.
Be connected with the safe card reading module of SIM card and sim card slot with microprocessor.Described microprocessor is the ARMA8 processor.
Beneficial effect: the present invention carries out the systematization distributed frame by the distributed frame technology to whole portable terminal, by adopting the andriod embedded OS as the core control system of handheld terminal, ultrahigh frequency RFID is read and write technology, the NFC technology, 3G comprehensive wireless mechanics of communication, random delay mechanism anti-collision algorithm, PSAM DEA etc. carries out integrated, develops and can intelligent control, the ultrahigh frequency RFID read-write, many communication modes, anti-interference in real time, the GPS global location, bar code scan, the RFID Intelligent terminal for Internet of things of the several functions such as data encryption.
Description of drawings
Fig. 1 is the multifunctional management system figure of Internet of Things portable terminal of the present invention;
Fig. 2 is the block diagram of handheld terminal of the present invention;
Fig. 3 is one of the block diagram of the read/write circuit module of handheld terminal of the present invention;
Fig. 4 be handheld terminal of the present invention the read/write circuit module block diagram two;
Fig. 5 is the block diagram of RFID mutual authentication method of the present invention;
Fig. 6 is the block diagram of the 3G communication module of handheld terminal of the present invention;
Fig. 7 is the emission system block diagram of the 3G communication module of handheld terminal of the present invention;
Fig. 8 is the receiving system block diagram of the 3G communication module of handheld terminal of the present invention;
Fig. 9 is the connection block diagram of encryption chip of the present invention;
Figure 10 is the block diagram of power management module of the present invention;
Figure 11 is software systems architecture block diagram of the present invention;
Figure 12 is Software for Design theory diagram of the present invention;
Figure 13 is running software theory diagram of the present invention;
Figure 14 is Software Method operational process theory diagram of the present invention.
Embodiment
Embodiment 1: referring to Fig. 1, the multifunctional management system of Internet of Things portable terminal comprise RFID electronic tag or IC-card ID number or label in data, bar code information, image information, the GPS positioning position information of storing, and these information exchanges are crossed wireless or wired communication modes and background server carries out exchanges data, the result who obtains is shown for man-machine interaction at handheld terminal.Wherein, RFID (Radio FrequencyIdentification) is radio-frequency (RF) identification.
Referring to Fig. 2, the multifunctional management system of described Internet of Things portable terminal comprises shell, be fixed with in the enclosure mainboard, be provided with display module and display screen on the mainboard, also be provided with operation interface and external-connected port on the mainboard, and be arranged at this enclosure and with described display screen, the control circuit that operation interface is connected with external-connected port, described control circuit comprises microprocessor, and the ultrahigh frequency RFID read/write circuit module that is connected with this microprocessor respectively, power management module, memory, the PSAM encryption chip, the 3G wireless communication module, the bar code module, the 2D/3D figure accelerates and the video code and decode module.The up-to-date ARM A8 processor of the hardware using of this terminal is core, this is the built-in terminal CPU of a complete function, rich interface, work dominant frequency and 1GB internal memory that 1Ghz is arranged, support video code and decode and 2D/3D figure to accelerate, support TV out and VGA output, support the 3G wireless telecommunications, and abundanter Peripheral Interface, can be applicable to performance and disposal ability are had the embedded system application scenario of requirements at the higher level.This project is by resource consolidation and andriod system transplantation to the A8 processor, undertaken integrated by ultrahigh frequency RFID read/write circuit module, power management module, memory, PSAM encryption chip, wireless communication module, bar code module, 2D/3D figure are accelerated and video code and decode module etc., construct the hardware system of a complete RFID intelligent hand-held terminal, its functional characteristics comprises:
Kernel: ARM Cortex-A8
Dominant frequency: 1GHz
Internal memory: 1G Bytes DDR2
·Flash：256M?Bytes?SLC?NAND?FLASH
Support MPEG-4/MPEG2, H.264/H263, the coding and decoding video 1080p@30fps of VC-1, DivX
Support the 2D figure to accelerate, maximum 8000 * 8000 resolution of supporting
Support the 3D figure to accelerate (SGX540), OGL-1.1﹠amp; 2.0, OpenVG1.0
Support the SD/MMC/SDIO interface memory card, the highest support 32GB
Support the JPEG hardware compression, maximum 8192 * 8192 resolution of supporting
Support TV-OUT, HDMI, VGA, DVI, LVDS, MIPI interface
Support 4 USB HOST2.0,1 USB OTG2.0 and 4 RS232 interfaces
Support 2 SDIO interfaces (2 SD card interfaces, 1 T-FLASH card interface, 1 SDIO wifi interface)
Support 2 independent CAMERA interfaces
Support the 100M Ethernet card
Support 8 * 8 matrix keyboard interfaces, plate carries KEYBUS
Support 3.5 cun, money Liquid Crystal Module more than 4.3 cun
Support WIFI, 3G, GPS, bluetooth, camera, the function such as infrared
Because diversity and the particularity of its application scenario of RFID intelligent wireless handheld terminal, in the design of hardware platform, ultrahigh frequency RFID read/write circuit, 3G communication module, encryption chip module, power management module are of paramount importance four parts in the Hardware Design:
1) ultrahigh frequency RFID read/write circuit module:
RFID intelligent wireless handheld terminal is based on the RFID technology and the radio frequency identification product that forms, internal RF ID module for reading and writing utilizes radio-frequency technique to read the information of external radio frequency identification label or information is write electronic tag, and its read-write mode mainly is to utilize computer and network system to manage and communication.
This project has comprised the technical research of the aspects such as air interface, physical layer interface, communications protocol according to the less radio-frequency related protocol, ultrahigh frequency RFID read/write circuit inside modules is divided into: coding module, decoding module, CRC module and clock frequency division module.After data message used the CRC module to produce, transfer to coding module, coding module is analyzed with it through clock frequency division module, obtains to prepare the data of safety; When sending information data, decoding module receives the information data that the ARM7 processor produces, and analyzes decoding by clock frequency division module, then produces secure data flow by the CRC module, launch information data by the antenna radio frequency at last, figure is referring to Fig. 3 for its design principle.
Ultrahigh frequency RFID read/write circuit module is in reception and read write tag signal, coding-decoding circuit by inside circuit carries out, by rf modulations, power amplification, filtering signal, demodulation, local oscillation signal etc., realize the hyperfrequency read-write of RFID signal, the interior data integrity of its signal, the generations such as phenomenon that do not produce packet loss, reading/writing distance improves more than 60% than existing RFID terminal, can support low frequency 135HZ to microwave (2.4GHZ) simultaneously, and its schematic diagram is referring to Fig. 4.
Be directed to the situation that in the situation of a plurality of RFID intelligent terminal read-writes, can produce the problems such as collision, interference, this project is improved algorithm on the basis of binary system anticollision searching algorithm being carried out detailed quantitative analysis, design the RFID mutual authentication method, it is anti-interference, the anticollision design is referring to Fig. 5.
When a plurality of electronic tags enter in the radio-frequency region of read write line simultaneously, they will respond simultaneously the order of read write line and return the id information of self, optionally sort by the ID symbol of RFID two-way authentication with equal length, effectively reduce the congested of formation, reduce the number of times of read write line access electronic tag to reach the purpose of quick location and credible identification, realize high anti-interference, the anticollision of project, guaranteed the process stabilization of read-write.
2) communication module:
This project adopts the 3G wireless communication mode in the selection of communication modes, support wCDMA and three kinds of different systems of EVDO, TD, can be according to the demand of different application and local networks environment and flexible choice.3-G (Generation Three mobile communication system) (3G) is named into IMT-2000 (international mobile communication 2000) by the ITU of International Telecommunications Union, and its purpose is with unified frequency and standard, the realization global roaming in the whole world and various broadband services are provided.The IMT-2000 wireless transmission is used the 2000MHz frequency range, and two working frequency range are 1885～2025MHz and 2110～2200MHz, and two sections bandwidth are 230MHz altogether, and wherein, 1980～2010MHz and 2170～2200MHz are used for satellite communication.The IMT-2000 message transmission rate requires to reach 2Mb/s in indoor environment, outdoor walking environment reaches 384kb/s, reach 144kb/s in the outdoor vehicle, reach 96kb/s in the satellite mobile environment, most of business of present PSTN/ISDN and other public networks can be provided and mobile communication supplementary service and universal personal telecommunications (UPT) business are arranged.
The functional mode of 3G and interface are referring to Fig. 6.
The 3G mobile communication has following characteristics:
1) global standard and system (two large camps: the 3GPP2 of the 3GPP of European GSM MAP, U.S. ANSI-41);
2) professional diversity (speech, data, image, multimedia, Internet access etc.) and changeability (bandwidth on demand);
3) high bit rate grouped data, speed: 144kb/s～2Mb/s;
4) compatibility: can merge with various mobile communication system, interconnect, be convenient to the 2G smooth evolution, be transitioned into 3G;
5) secret, safe, easy to operate.
The quality of wireless telecommunications quality depends primarily on emission and the reception of signal, and this project is optimized design to transmitting and receiving, and its principle is as follows:
A) radiating portion: radiating portion is set operating frequency by the ARM main controller, after distributing by power divider, utilize the coding-decoding circuit rear transmission of encoding, and pass through frequency mixer, power amplifier etc. and carry out mixing and amplify processing, last signal transfers to radio-frequency antenna by circulator to be launched, referring to Fig. 7:
B) receiving unit:
Receiving unit mainly by circulator with the label signal of antenna reception deliver to band pass filter, signal amplifier carries out filtering and amplification, and after processing by power divider, demodulator circuit etc., utilize the baseband signal of voltage comparator reduction label information, process through delivering to the coding-decoding circuit decoding after the shaping, referring to Fig. 8.
3) encryption chip:
Information data and communication encryption mainly are to guarantee its fail safe by data encryption is carried out in transmission information in the network and communication, are a kind of active safety defence policies, provide powerful safeguard protection by effective means for information data and communication.The industry of its application of RFID intelligent terminal it requiring for the information security rank relatively highly, and this project is directed in the RFID intelligent terminal, the optimal design encryption chip.
Encryption chip adopts PSAM terminal security technology to carry out internal circuit design in conjunction with the XTMA cryptographic algorithm, carry out the functions such as program storage, data storage and IS07816 communication interface integrated, project is according to the similitude based on XTMA algorithm encoding-decoding process, take encoder and decoder to save circuit area consumption with the formation of same circuits structure, control the operating state (encoding state or decoded state) of codec by mode.The core of circuit is a state machine, come the state of control circuit by state controller, according to corresponding state, data channel is controlled the exchanges data of whole circuit, opens up and stores some necessary in coding and decoding process intermediate data information between certain buffer area.Referring to Fig. 9.
4) power management module:
The hardware of RFID intelligent terminal need to keep stability, reliability, requiring its utilization and managerial demand for power supply reasonably to carry out, this project is directed to the present energy consumption of RFID intelligent terminal, the stable difficult problem of energy supply, the designing power supply administration module has carried out rational power distribution and good circuit decoupling to the RFID intelligent terminal.
Power management module adopts the low-power consumption coupling technique to be optimized design, by differential mode radiation in the control circuit, common mode radiation and rational deployment cabling, dwindle the size of element circuit, reduce the cell layout area, through the simplest logic realization circuit function of optimization, so that the RFID intelligent terminal has low-power consumption, low cost, stable power generation circuit, and can be good power consumption is strictly controlled, its system architecture is referring to Figure 10.
Software systems:
For a change traditional handheld terminal software directly acts on the mode of operation of hardware, and this project adopts the android embedded OS as the fundamental operation platform of handheld terminal.Android is that Microsoft company is for the operating platform of handheld terminal exploitation, it comprises underlying operating system Android and upper strata driving and application etc., and several versions of Android are all built-in a series of for Android development of user application program and system hardware driving.Its system architecture as shown in figure 11.
Among Figure 11, ground floor: (SuSE) Linux OS and driving (Linux kernel): realized by the C language.
The service of Android core system depends on the Linux2.6 kernel, comprising: fail safe, memory management, management of process, procotol, driving model.Linux kernel is also as the level of abstraction between the hardware and software stack.
Except the linux kernel of standard, Android has also increased the driver of kernel: Binder (IPC) driving, display driver, input equipment driving, audio system driving, webcam driver, WiFi driving, bluetooth driving, power management.
The second layer: local framework and Java Runtime Environment (LIBRARIES and ANDROID RUNTIME)
Local framework is to have C/C++ to realize.Comprise the C/C++ storehouse, used by different assemblies in the Android system, they are served for the developer by the Android application framework.
The 3rd layer: Android application framework (ANDROID FRAMEWORK)
In the Android system, the developer also can access the employed API framework of core application fully.
The 4th layer: Android application program (APPLICATIONS)
Mobile device based on Android provides outstanding sector application platform for enterprise, and it can provide optional hardware widely, powerful developing instrument and long-acting service time of battery.Equipment based on Android allows the enterprise customer still can process the work of oneself when going out, and allows the user satisfy the enterprise demand that constantly changes by extension facility.Now, the mobile subscriber is very obvious to the demand growth of data information access.The more users access can be supplied with by mobile network connection in the new types of data source that comprises Internet.
As the operating system of an opening, Android provides a lot of facilities for the developer.The developer can be based on the Android application program of Android exploitation oneself.Android4.0 has thoroughly eliminated the gap between Smartphone and Pocket PC and other the different mobile devices, no matter the speed of hardware, screen resolution and memory span have much difference, Android5.0 can customize easily for it, to adapt to various application scenario.
Android is a kind of compression of various embedded systems and product design, efficient, upgradeable operating system.In the exploitation of Android product, two important aspects are arranged, one is Custom Kernel, one is the exploitation of application program.
Android is not a general installation version operating system.In the panoramic embedded hardware equipment world, the common only meeting of a Android system generates for a certain hardware platform.So, must be according to hardware platform and the application scenario customization CE of oneself.The operating system transplantation step is: 1) operating system is reduced, dispose each assembly and revise relevant configuration file; 2) device driver on the development goal device systems is set up the CE mapping document of operation system of customization; 3) file destination is downloaded on the target device debug; 4) behind the customizing operating system kernel, derive platform SDK.
Be directed to the industry-by-industry characteristic of the application of RFID intelligent terminal, software systems are divided into three parts, are respectively: application software interface part, read write line control section and data processing section, its design principle is referring to Figure 12.
1) application software interface part:
This part is the top layer of software systems, mainly finishes the information interaction with host computer, comprises the parsing of the order that host computer transmits and returns to processing of host computer information etc.The host computer application program comprises the submodules such as database module, graphical interfaces module, and by this part, upper computer software can be controlled transmitting power, agreement control, data message demonstration of read write line etc.
2) read write line control section:
This part comprises protocol process module, radio frequency control module, parameter configuration module etc., mainly be to accept host computer to send the read write line control command, it is resolved, send control command to radio frequency control module, mainly comprise read write command and parameter configuration order.Read write command mainly comprise take inventory, reading and writing, the orders such as LOCK, KILL.This part is the core of system, and this part is mainly finished the anti-collision algorithm of 18000-6C agreement and coding, CRC check and the anti-collision algorithm etc. of 18000-6B agreement.This part also will communicate with other parts, just can finish the processing procedure to label.At different applied environments, need to dispose neatly different parameters, such as data rate of transmitting power, modulation system and the return link of read write line etc.This part partly obtains the parameter that disposes from application software interface, and after configuration was finished, read write line can return the result of configuration.
3) data processing section:
Data processing section is mainly data processing module, is to accept host computer to send the read write line control command, and it is resolved, and sends control command to radio frequency control module, mainly comprises read write command and parameter configuration order.Read write command mainly comprise take inventory, reading and writing, the orders such as LOCK, KILL.This part is the core of system, and this part is mainly finished the anti-collision algorithm of 18000-6C agreement and coding, CRC check and the anti-collision algorithm etc. of 18000-6B agreement.This part also will communicate with other parts, just can finish the processing procedure to label.At different applied environments, need to dispose neatly different parameters, such as data rate of transmitting power, modulation system and the return link of read write line etc.This part partly obtains the parameter that disposes from application software interface, and after configuration was finished, read write line can return the result of configuration.
Software systems are in running, main completion system initialization, read write line parameter configuration, read write tag and writing labels operation etc., when the host computer application program is sent out an order, in the RFID intelligent terminal module for reading and writing at first can be in application interface module resolve command, judge that order is read write command or parameter configuration order, its operation logic such as Figure 13.
Aspect the read-write algorithm, be directed to the relatively slow defective of binary search algorithm read or write speed, binary search algorithm is optimized and improves, so that the RFID intelligent terminal can guarantee that all labels are identified fast and effectively in the radio-frequency antenna radiation scope, can support all kinds of frequency signals of from low frequency 135HZ to microwave (2.4GHZ), its algorithm operational process schematic diagram such as Figure 14.
Claims (10)
1. the multifunctional management system of an Internet of Things portable terminal, comprise RFID electronic tag or IC-card ID number or label in data, bar code information, image information, the GPS positioning position information of storing, with these data with information exchange is crossed wireless or wired communication modes and background server carries out exchanges data, the result who obtains is shown for man-machine interaction at handheld terminal; It is characterized in that, described handheld terminal comprises shell, be fixed with in the enclosure mainboard, be provided with display module and display screen on the mainboard, also be provided with operation interface and external-connected port on the mainboard, and be arranged at this enclosure and with described display screen, the control circuit that operation interface is connected with external-connected port, it is characterized in that, described control circuit comprises microprocessor, and the ultrahigh frequency RFID read/write circuit module that is connected with this microprocessor respectively, power management module, memory, the PSAM encryption chip, the 3G wireless communication module, the bar code module, the 2D/3D figure accelerates and the video code and decode module.
2. management system according to claim 1 is characterized in that, described operation interface comprises the operation interface that is connected with microprocessor and the interface of reading that is connected with the bar code module.
3. management system according to claim 1, it is characterized in that described external-connected port comprises the USB interface that is connected with the USB administration module, the Ethernet interface that is connected with ethernet module, the power interface that is connected with power management module, the code reader that is connected with the bar code module and is connected with the safe card reading module of SIM card and sim card slot with microprocessor.
4. management system according to claim 1 is characterized in that, power management module is connected with battery with microprocessor, and battery is connected with charging inlet by charge management module.
5. management system according to claim 1 is characterized in that, described external-connected port also comprises GPS module and the fingerprint module that is connected with microprocessor.
6. management system according to claim 1, it is characterized in that, described ultrahigh frequency RFID read/write circuit module, comprise coding module, decoding module, CRC module and clock frequency division module, clock module is connected with the CRC module controls with coding module, decoding module control respectively, coding module is connected with decoding module with the CRC module data and is connected, and the CRC module is connected with the antenna radio-frequency module.
7. management system according to claim 1 is characterized in that, described 3G wireless communication module comprises emission system and accepts system; Wherein emission system comprises that master controller, frequency mixer, blender, band pass filter, power amplifier circulator be connected with antenna and connect, and the baseband signal end of master controller directly is connected with blender; In the receiving system, the inverse signal of label is connected with power amplifier by filter, power amplifier is connected with power divider, two outputs of power divider are connected with differential amplifier circuit with filter by demodulator respectively, differential amplifier circuit, comparator are connected with shaping circuit and are connected, being connected with the coding and decoding circuit of the output of shaping circuit.
8. management system according to claim 1, it is characterized in that, described power management module, comprise inductance resonant network, full-wave rectifying circuit, amplitude limit fixed amplitude circuit and voltage stabilizing regulating circuit, wherein two of the inductance resonant network outputs are connected with the input of full-wave rectifying circuit respectively, being connected with the amplitude limit fixed amplitude circuit of simultaneously these two outputs, the power end of described full-wave rectifying circuit output is connected with two inputs of voltage stabilizing regulating circuit respectively.
9. management system according to claim 1 is characterized in that, is connected with the safe card reading module of SIM card and sim card slot with microprocessor.
10. management system according to claim 1 is characterized in that, described microprocessor is ARM A8 processor.
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| CN103179455A (en) * | 2013-04-01 | 2013-06-26 | 上海盛本通讯科技有限公司 | Android-system-based video encryption system and encrypting and decrypting method thereof |
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| CN107358271A (en) * | 2017-05-24 | 2017-11-17 | 维沃移动通信有限公司 | A kind of reading/writing method of mobile terminal and its identification code |
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| CN110427789A (en) * | 2019-04-04 | 2019-11-08 | 福建新大陆自动识别技术有限公司 | A kind of reading data device integrating bar code recognition module in fuselage interior |
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