Abstract: This paper introduces the design scheme, system composition, main functions and implementation of a non-contact IC card warehouse management system, and discusses the system security. 
With the rapid development of non-contact IC card technology, it is widely used because of its non-contamination, wear and scratch, and the card itself is a passive component, small size, durable and reliable, and quick and convenient operation [1]. In the systems of road tolls, attendance, access control, restaurant billing and identification, it has brought unprecedented convenience to people's lives.
 At present, warehouse management is mainly based on the manual work of the corresponding specifications and semi-automatic management of computers. The shortcomings are obvious, that is, it requires a lot of manpower to carry out the placement of regulated items, regular inventory, and registration of inbound and outbound warehouses, which makes the warehouse management problem very cumbersome and wastes a lot of time. Therefore, it is ideal to apply non-contact IC cards to warehouse management, which is also a new application field for contactless IC cards.
1. Introduction to non-contact IC card
 Non-contact IC card, also known as Radio Frequency Identification Card, is a new technology that has developed rapidly in recent years. It features non-contact two-way communication, fast operation, reliable reading and writing, and high security. As shown in FIG. 1, the hardware structure of the non-contact IC card is composed of an antenna and a dedicated chip. The antenna is a coil with only a few sets of windings, which is suitable for packaging into the ISO7816 standard card; the dedicated chip consists of a high-speed RF interface, an access unit and an E2PROM. The RF interface section receives signals from its own resonant circuit and generates power and operating clocks therefrom. The interface also demodulates data transmitted from the read/write device to the contactless IC card and data transmitted from the contactless IC card to the read/write device. . The control unit is used for password verification, programming mode checking, data encryption and decryption, etc., and controls the read and write operations on the E2PROM. To prevent data interference between cards, the contactless IC card also has an anti-collision closure mechanism. When there are multiple cards entering the operating range of the reader, the anti-collision closing circuit first selects one as the pre-processing object, while the other cards are in the idle mode to wait for the next selection, so that multiple cards can be processed continuously [2].
2. Warehouse management system based on non-contact IC card
 The purpose of non-contact IC card warehouse management system design is to realize the automation of item storage and storage control, item storage location and quantity statistics, and information inquiry process, and facilitate management personnel to conduct statistics, query and grasp the flow of materials. In order to meet the requirements of convenience, speed, safety and efficiency, the system design is as follows.
2.1 system composition
 Non-contact IC card warehouse management system hardware includes: host, printer, inbound and outbound reader, position reader, mobile reader, RS485 interface card, electric control door, alarm detection device. The host is equipped with management software, which is connected to the inbound and outbound reading and writing machine and all position readers through the RS485 interface card and controls them, such as setting permissions, reading records and statistical queries; The placement, the inbound and outbound reader controls the electric control door, and collects the inbound and outbound records of the items. The system structure is shown in Figure 2. The system uses a non-contact IC card as the identification of the item, and stores its model, date of manufacture, quantity, and the like.
 This system management software is developed under the Windows 98 environment and adopts VB 6.0. It mainly includes five modules: system setting, warehousing management, outbound management, material management and database management.
 System settings include password modification, warehouse area, reader address, serial port and alarm rules;
 Out, warehousing management read and write IC card, add, delete records, generate reports and other modules;
物质 Material management has the functions of material location, inventory, statistics and report generation;
 Database management can browse, query, sort, etc. the database, and can only modify or edit some information, such as damage degree, remarks, etc., without the right to add or delete any records. 
2.2 Main functions of the system and its implementation
 (1) Material positioning
 When an item enters or exits a certain area of ​​the warehouse, it needs to pass the position reader of the area. The reader records the item, and the logical circuit determines the direction of the item in and out, as shown in Figure 3. The host receives the record and the entry and exit identifiers, and modifies the database. If the item enters a zone, the record is added to the zone in the database; otherwise, the record is deleted. This realizes that the actual location of the warehouse materials and the information in the host database are in one-to-one correspondence, which brings great convenience for the management personnel to inquire, check and find materials. 
(2) Inbound and outbound management
登记 Registration of materials in and out of the warehouse is an important part of warehouse management. Once the number of items is too large, the workload is large and error-prone, which may result in the loss of state property or corporate property. The system is based on the principle of caution and manual management and automated office management. The workflow of the inbound and outbound management subsystem is shown in Figure 4. The advantage of this system is that the materials in and out of the library are synchronized with the addition and deletion of the database, and finally generate reports, which greatly reduces the workload of the management personnel.
 It should be noted that the inbound and outbound readers in this system are similar to the location readers. Two infrared receivers are equipped to determine whether they are inbound or outbound. In addition, under normal circumstances, the electric baffle works under the control of the manual command and the inbound and outbound reading and writing machine commands. When the reader works abnormally, it can be manually opened or closed. 
(3) Material inventory
定期 In warehouse management, regular inventory is an essential task. The system is also equipped with a mobile reader, and the staff can quickly complete the material inventory task by holding it in the warehouse. The specific process is: sub-area; the reader reads the IC card information, and sends it to the host as a record to store in the new database; after reading an area, the host compares the old and new databases in the area and records the result; Repeat the above process. After the warehouse inventory is completed, the material statistics report and the difference report are generated, so that the problem can be discovered in time.
2.3 interface communication design
主机 The host is connected to the inbound and outbound reader/writer, position reader/writer and mobile reader through RS232 serial port or RS485 serial interface card (networking).
 (1) Reader Interface Protocol
 Command/response format "Length command word address parameter checksum", where the length of the byte from "command word" to "check number" is assigned as follows: host address is 00H, inbound and outbound reader address For FFH, the location reader address is 01-F0H, the mobile reader address is FEH; the check is even parity.
ä¸²å£ Serial port parameter baud rate is 9 600, 8 bits, 1 stop bit, no parity.
 (2) interface function
 The system uses the Windows API communication interface function to implement data communication between the host and each reader.
2.4 System Security Analysis
 With the rapid development of non-contact IC card technology, the security systems provided by various non-contact IC card manufacturers are becoming more and more perfect. First, the serial number of each card is unique and has been solidified during the production process and cannot be changed. In the communication security, the three-time mutual-intelligence check technology conforming to the ISO9798 international standard is adopted to verify the legality of the card and the reader. The DSA algorithm is used to encrypt the data in the data communication to ensure that the data is not illegally modified. . The authorization mode is adopted in the read/write control. That is, the read/write device must obtain the authorization of the “device authorized card†before reading and writing the IC card of the system, and the initialization of the card must be authorized by the superior authorization card, and only in the Performed on the specified authorized device. Therefore, there is no problem that the password is cracked in the authorization mode. As long as the authorization card is not stolen, the security of the system can be guaranteed [3].
 Therefore, properly regulating the management system of the IC card and properly storing and using each authorization card will ensure the high security of the system.
2.5 two points
 (1) Since the read/write distance of the non-contact IC card is short, it is necessary to standardize the operation of the warehouse management personnel to ensure that the data is read and written effectively;
 (2) The price of the non-contact IC card is relatively high, and the number of items in the warehouse is large, so it is required to properly configure the IC card to make the system cost-effective.
3 Conclusion
设计 The design and implementation of a warehouse management system based on a contactless IC card is a new application of contactless IC card technology. With the continuous development of non-contact IC card technology, it is believed that the read and write distance will continue to improve in the near future, which will bring greater convenience to warehouse management and thus generate more positive social benefits.
ã€references】
1 Wang Zhuoren, Deng Jinxi, Liu Zongxiang. Technology and Application of IC Card. Beijing: Publishing House of Electronics Industry, 1999
2 Ma Haifeng, Tang Tao. Non-contact IC card and its development and application. Electronic Technology, 1998, 4
3 Xiong Lijun. Non-contact IC card technology. Journal of Shenzhen University (Technology Edition), 1998 (15), 9:2~3
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