1 Introduction
China is a large country with concentrated labor-intensive production enterprises. Labor-intensive production enterprises have always had many problems, such as complicated personnel and complicated procedures. In the daily management work, a lot of manpower and material resources are needed to manage the daily work of the employees, and the daily workload, the progress of the inspection, the quality of the inspection work, and the reporting work are counted. At present, most enterprises use the combination of office software and statistical software to complete these tasks, which are inefficient and print, and have high labor and consumable costs. In the early stage of the research, we proposed a production management piece counting system based on RFID-based RFID_UIM technology, which produces mobile phones equipped with RFID_UIM cards. Each production group is equipped with a computer, an application receiver, and a barcode scanner. The production team leader uses the barcode scanner to read the piece material number. The production team member uses the RFID_UIM card mobile phone brush to apply the receiving machine to receive the materials. After the production team leader confirms the card, the record is generated as the original record of the system statistics. In order to achieve the purpose of the manufacturer to understand the overall production situation and cost, it provides a scientific basis for enterprises to improve production efficiency. However, in the actual application process of the production management piece metering system based on RFID_UIM technology, the use of the receiving end machine and the scanning gun greatly limits the use scenario and increases the user's use cost. In order to solve this problem, we have carried out research on static distance wireless communication NFC technology, designed a production management system based on NFC technology, and realized the function of the original application receiving end machine and scanner by using the NFC-enabled mobile phone terminal. Customer use costs.
2.Technological base
NFC (Near Field Communication) is a non-contact sensing and identification technology that allows non-contact point-to-point data transmission between electronic devices to exchange data, running at a distance of 20 cm at 13.56 MHz. Developed by non-contact radio frequency identification (RFID), developed by Philips, Nokia and Sony, based on RFID and interconnect technology. Inductive readers, inductive cards and point-to-point functions on a single chip enable identification and data exchange with compatible devices over short distances.
NFC includes three modes of operation: card mode, peer-to-peer mode, and card reader mode. Card emulation: This mode is actually equivalent to an IC card using RFID technology. Can replace a large number of IC card occasions, such as shopping malls card, bus card, access control, tickets, tickets and so on. P2P mode: This mode is similar to infrared. It can be used for data exchange, with short transmission distance, fast transmission speed and low power consumption. Can achieve data point-to-point transmission, such as download music, exchange pictures or synchronize device address book. Reader/writer mode: Used as a contactless reader, such as reading information from a poster or exhibition information electronic tag. This program adopts the card reader mode to realize the production management functions such as data acquisition and piece counting.
Like RFID, NFC information is also transmitted through the electromagnetic induction coupling of the radio frequency part of the spectrum, but there is still a big difference between NFC technology and RFID technology. First, NFC integrates contactless readers, contactless cards, and peer-to-peer functionality into a single chip, and RFID must consist of readers and tags. Second, the NFC transmission range is smaller than that of RFID. The transmission range of RFID can reach several meters or even several tens of meters. However, because NFC adopts a unique signal attenuation technology, NFC has a close distance, high bandwidth and low energy consumption compared with RFID. Features. Due to these characteristics of NFC, the production management system we designed has adopted NFC technology to replace the original RFID_UIM technology, which aims to reduce equipment investment and facilitate customer use.
3. System architecture
The production management system involves three objects: the production worker, the production plant leader, and the IE department. The IE department is responsible for the editing and generation control of the production process and acts as a label manager. The IE department will sign the piece-counting information and write it to the NFC piece label. The production plant leader will install the NFC mobile communication terminal of the piece-counting module close to the NFC piece label to obtain the piece item data information, close to the production team member NFC mobile communication terminal or IC card. Confirm identity and allow to receive the piece-counting items, and send the information to the background of the production management system through the mobile communication network; the production management system obtains the data information sent by the mobile communication terminal and the user information of the mobile communication terminal in the background, and analyzes and judges according to the production management rules. deal with.
The above is a system introduction given from the system role assignment. The following is an analysis of the system architecture from the technical implementation of the system application module (Figure 1). The production management system based on NFC technology is mainly composed of production management system background, mobile communication terminal, NFC tag and mobile communication network.
Figure 1 System Architecture
Fig.1 System architecture
The production management system uses the B/S structure in the background and develops on the J2EE platform. It contains the corresponding management software and background management database. Functionally, it includes a tag management subsystem, an IE subsystem, a query subsystem, and a management subsystem. The tag management subsystem provides the function of adding, deleting, changing and checking the code. At the same time, it provides the function of the IE department administrator to encapsulate the piece counting information into the format of the NFC piece label and write the label; the IE subsystem is responsible for the input and output of the process flow chart. And the template import function; the query subsystem provides the function of the production team leader to view the completion of the piece metering of the day and the current month of the group; the control subsystem provides the function of the administrator to generate various reports for each employee and each group in terms of production completion. .
The mobile communication terminal is divided into four layers, which are an NFC hardware communication layer, an adaptation layer, an NFC probe analysis development package, and a piece count information reading module. The NFC hardware communication layer is mainly composed of an NFC controller, a security unit, and an antenna. The NFC antenna receives the NFC data signal sent by the external NFC tag, and the NFC controller converts the received NFC data signal into a data mode to convert the NFC radio frequency signal into a digital signal, and the security unit uses the telecommunication network in the system. The choice is the UIM chip. The NFC controller communicates with the UIM card through a single wire communication protocol (SWP). The upper layer NFC probe resolution development package provides a method for detecting and parsing NDEF (NFC data exchange format). The system's piece counting information reading module is installed in the user's smartphone client. When the mobile communication terminal scans the data tag with NDEF, the Android-based NFC probe parsing development package reads the data tag.
4. Key technologies
4.1 Implementation of product coding
In the production management system, the NFC piece number label uses the EPC-96 code to generate the piece item code. The EPC is the only information stored in the NFC tag, and has been supported by the main supervisory bodies of the two international standards of UCC and International EAN. The code consists of a version number and three other pieces of data (in order of domain name management, object type, serial number). The meaning of each field is shown in Figure 2, where the version number is the version and structure of the EPC; the domain name management is the information describing the manufacturer associated with this EPC; the object type records the exact type of the item; the serial number uniquely identifies the item of the piece. Different batches.
Figure 2 EPC-96 encoding meaning
Fig.2 EPC-96 coding meaning
4.2 Selection of NFC piece number label types
In June 2006, the NFC Forum introduced a standardized technical architecture, initial specification and label format for NFC-compatible devices. All NFC-compatible devices must support initial setup of four tag formats. The four tag types are ISO1443-A, B, MIFARE. , TOPAZ and Felica. In the system design, you need to carefully consider the relative advantages and disadvantages of each type of label, and determine the label format while meeting the needs while balancing the cost and performance.
In production management system applications, the read rate provided by the tag is an important factor to consider. The higher the read rate, the less likely it is that a read or write "interrupt" will occur. When a read or write interrupt occurs, the data cannot be transmitted completely or accurately even though the tag and the reader are in close proximity. Therefore, the read rate has a direct impact on system reliability and user experience. The ISO1443-A proprietary "Read All" command reads all the contents of the tag at once, without having to read one block at a time, which improves read performance to some extent. At the same time, because the reader of the NFC tag in the system is a mobile phone, it does not need long-distance identification, and the length of the unique code of the piece product is EPC code, which only needs 96 bits, and combines the above performance and price cost. The system selects the ISO1443-A label standard, the data transmission rate of 106kbit/s, the recognition distance of about 10cm, and the label memory 512 bits.
4.3 Scheduling of NFC Piece Labels
The Android mobile client is the initiator of the communication in this system, that is, the reader as the NFC metering tag. NFC for Android devices can handle tag requests even when the screen is locked, unless disabled in the NFC device's settings menu. The main format of the data on the NFC piece number label is NDEF. When an Android device discovers an NFC tag, it will provide a special tag scheduling system to scan and analyze the NFC tag and try to find the appropriate application to handle. Android support for NFC is mainly in the two packages android.nfc and android.nfc.tech. The technology supported by the NFC tag is determined by using the getTechList() method, and a corresponding TagTechnology object is created using a class provided by android.nfc.tech.
5. Conclusion
The production management system based on NFC technology realizes the function of replacing the application receiving machine tool and the scanning gun with the mobile phone terminal supporting NFC function. The product code is implemented by EPC-96 code; the NFC tag type is selected by ISO1443- A standard; NFC tag scheduling uses the Android Tag Scheduling Development Kit. At present, the production management system based on NFC technology has been used in many garment manufacturing enterprises, which has effectively reduced the threshold for customer use and reduced the cost of system deployment.
The design and implementation of production management system based on NFC technology has opened up a broad application prospect for NFC technology embedded consumer management system, customer management system, commercial promotion system, logistics management system, asset management system and other systems. In the next 2-4 years, the innovation and upgrade of various systems based on NFC technology will bring great changes to people's lives, leading the development direction of proximity sensing technology and becoming another highlight of the information age.
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