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Chapter One Introduction to RFID
RFID definition
Radio frequency identification (RFID) technology is an automatic identification technology that has matured from the 1980s. Due to the maturity of large-scale integrated circuit technology, the size of the radio frequency identification system has been greatly reduced, and thus it has entered the stage of practical application. It uses radio frequency for non-contact two-way communication, which has reached the identification of the mother and exchange data. It is different from the contact identification technology of the same period. The identification can be completed without contact between the radio frequency card and the reader of the RFID system. Therefore, it can be used in a wider range of occasions.
Classification of RFID
RFID is divided into high-frequency, intermediate-frequency and low-frequency systems according to different operating frequencies. It can also be divided into active and passive systems according to the radio frequency card supply source.
Selection of RFID products
According to the actual situation of Linhai Haitian Natural Gas Co., Ltd., in the management of liquefied gas cylinders, the package product approved by the relevant government department is a passive radio frequency chip with a frequency of 13.56MHz. Therefore, Insirui will use this type of chip and package it in accordance with the standards recognized by the national technical supervision department to ensure that it provides the leading RFID application template in the liquefied gas industry.
Chapter 2 System Design
Demand target
The establishment of this plan is to connect the information of the gas cylinder with the internal management system of Haitian through the electronic label of the gas cylinder, so as to maximize work efficiency, paperless work process, and save work time and energy consumption. , Realize the tracking and management of each gas cylinder at all times and locations during the circulation of gas cylinders, to prevent accidents and safety hazards, and to ensure orderly circulation and sales.
The first section system design ideas
Hangzhou Insirui is considering the current system situation and combining with previous development experience, it will tailor a set of liquefied gas that combines real-time cylinder electronic label data collection, production inspection statistical management, and efficient distribution tracking management as a whole. solution. It can assist Haitian Natural Gas to be backed by good management, manage the circulation of each steel cylinder through a good logistics distribution management system, and be able to track each individual steel cylinder in a timely and accurate manner, and fully meet the relevant requirements.
The entire system will establish an underlying data processing system such as electronic label reading and pasting, electronic label data collection, etc., adding new application systems such as filling production management, steel cylinder inspection management, and steel cylinder storage and transportation management, combined with the existing system structure of the existing system , Establish a set of multi-layer structured software system, design data, interface processing, application, etc. separately to ensure that the system has good processing capabilities and expansion capabilities in the future.
Section 2 System Composition
The system will mainly consist of the following parts. Considering the investment of the entire system, Haitian Natural Gas can selectively develop the required management modules:
1. Label issuance management
Through the preset one or more electronic label production points, the blank chip can be combined with the information system, and the electronic label can be read and written, produced and pasted in a centralized, unified and standardized manner, so that the electronic label management has rules to follow.
2. Production management
Through the management of the empty and actual conditions of steel cylinders entering and leaving the irrigation plant, combined with the sales system, it can specify the production plan more based on the basis, and provide an important information basis for the management of the trinity of production, inventory and sales.
3. Inspection management
Routine inspections of steel cylinders or inspections of steel cylinders such as the transfer of property rights can manage the cylinders from the source and avoid potential safety hazards.
4. Storage and transportation management
Data collection and corresponding tracking and verification management for the steel cylinder transportation link from the filling plant to each supply station can help the LPG company improve the original system and make the various links from the LPG sales to the market feasible. Control state.
5. Collection and tracking management
The core of the system is to collect data from electronic tags when steel cylinders are in different business links. By analyzing the current situation and comparing the plan, it can play a role in tracking management and provide a factual basis for possible remedial plans.
Section 3 System Network Structure
Network structure diagram
Three-tier structure
The three-tier structure model is the current advanced collaborative application development model. This solution divides the various components in the system into three “tier” services, which together form an application. These three-tier services include:
· User Service
· Business services and other “middle tier” services (such as communications)
· data service
Chapter 3 System Function
The first section of the system process
Although the implementation of the electronic label system for steel cylinders first meets the relevant policies of the General Administration of Quality Supervision, Inspection and Quarantine and other departments, we should see that through the implementation of this system, it is completely possible to integrate the information system of the LPG company through the combination with other systems. The management ability of the company has been taken to a higher level. Using the identification medium of electronic tags, sales, production, inventory, distribution, etc. can be completely integrated into a controllable management system in management.
Although the products operated by the LPG company are unitary, through the implementation of this system, a complete supply chain management system can be provided, and all links from the filling of the cylinder to the sale to the user can be tracked and managed at any time. , So as to provide users with better services, or to lay a good foundation for operating other types of goods.
The process structure of the entire system can be seen in the following figure:
Chapter 4 Equipment Selection
Section 1 Reading and writing machine products
1.Explosion-proof data collector
Features:
It has the characteristics of beautiful appearance, small size, long standby time, etc., in order to be suitable for special environments, it adopts explosion-proof structure design, explosion-proof certificate number: GYB 03153.
Hardware parameters
512K program FLASH, 128K user RAM.
512K storage FLASH.
Using 128*64 dot matrix LCD display.
Use 3*7 user operation keyboard.
The RFID module can read ISO15693, ISO14443, ISO18000 standard electronic tags.
A SAM card socket, in line with the ISO7816 standard.
Communication adopts RS232 or RS485 interface.
The clock can work continuously for 2 years without power failure.
Development environment
C language conforming to ANSI standard.
Support modular programming.
Supports cross-compilation of standard C and assembly.
Can easily carry out code transplantation between different MCUs.
With code optimization function.
Embedded DS51 simulation debugging tool.
development tools
HSIC-RFID-005 user program downloader.
Application programming interface (API) function library.
Function interface description.
KEIL C51 compile simulation compile environment.
Performance
Working voltage: 3.6V—4.2V. (lithium battery)
Working current: <120mA.
Standby current: <30mA.
Standby time: >48 hours.
Working temperature: -10℃—70℃.
Storage temperature: -20℃—85℃.
Relative humidity: 20%RH—90%RH.
Guideline
Q/SKED01-2005 Reader Enterprise Standard
GB/TXXXX-2004 General technical specification for anti-counterfeiting smart labels
200420019318.6 Dual-frequency handheld electronic tag reader
GYB 03153 Explosion-proof certificate
2.Data reading and writing equipment can be customized according to specific requirements
Because there are many classifications and standards of RFID products at present, the detailed functions and parameters of reading and writing equipment can be made according to special requirements, such as door-type reading and writing equipment, desktop reading and writing equipment, color screen PDA reading and writing equipment, and customized data collectors. Wait, we will customize special read-write equipment according to the specific needs of liquefied petroleum gas, and achieve the best price and performance.
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