A bar-code recognition technology

About 1.1 bar

Bar Code (bar code) is ordered by a set of rules of different widths, and air and the corresponding characters of the mark, to indicate some of the characters, numbers and symbol information, so little information is stored. So far, the common bar code system, there are about more than 20 kinds of codes, including extensive use of the code system, including EAN code, Code39 yards, cross 25 yards, UPC code, 128 yards, Code93 codes, different systems have different codes characteristics. The bar code system is designed by the bar code symbols, bar code scanner to read the composition of production and the automatic identification system will be used to obtain the bar code scanner alignment information.

1.2 Principles of bar code identification

Automatic bar code data collection and conversion of optical signals by optical scanners to complete. Now many kinds of electro-optical scanners, but it works basically the same, are to read barcode data from the optical system and, through the Media Converter to convert light signals into electrical signals, and through the amplification of electrical signal shaping, and then decoding Conversion into computer recognizable binary information code.

2 RFID Technology Overview

RFID first appeared in the 20th century, 80's, was originally used for bar-code tracking technology can not use the occasion of special industries, many industries and companies use it to locate, identify and track inventory, or other targets.

In the specific application process, according to different purposes and the environment, RFID system components will vary, but in view of its working principle, the system in general by the signal transmitters, signal receivers, transmitting and receiving antennas of three parts. ① the signal transmitter: In the RFID system, the signal transmitter for different application purposes, will exist in different forms, the typical form of a label. Label is equivalent to bar code technology in the bar code symbols, used to store the need to identify transmission of information. In addition, the difference is that with the bar code label must be able to automatic or under the influence of outside powers to take the initiative to launch out of stored information. Label is usually with a coil, antenna, memory and control systems for low-power integrated circuits. ② signal receiver: RFID systems, the signal receiver is called the general reader. Readers the basic functions is to provide the label data transmission means.

In addition, the reader also offers a very complicated signal state control, parity error checking and correction functions. ③ Transmitting and Receiving Antenna: antenna is transmitted between tags and readers of data transmitter and receiver devices. RFID technology is used to track a number of goods, resources, and manpower and limited warehouse management is very real.

Is a form of RFID tags will be special information encoded into the RFID tags, the tags are affixed to the need to identify the object. It uses radio-frequency approach to non-contact two-way communication, in order to achieve identification purposes and to exchange data to maximize effective output and accuracy to meet the requirements.

3 RFID in the Warehouse Management application

3.1 of a rice company's warehouse management business analysis

Warehouse management business are the following:

(1) inventory out of storage, mobility management

Storage of rice procurement, rice, daily production, sales delivery, production and warehousing and rice storage areas to manage mobile work, produce, and move documents into and change the warehouse, the number of cargo space inventory, the registration total.

(2) inventory on a regular basis inventory, adjust inventory accounts to do things in line

According to an inventory of varieties of paddy and rice stocks made for each inventory cycle, and adjusted according to actual plate number of the most number of various types of paddy and rice stocks the most.

(3) Inventory Management Information Analysis

Inventory information from a variety of angles to analyze. Such as rice or rice quantitative analysis of inventory (whether excess or shortage of), inventory finance analysis, rice origin and destination of analysis.

Therefore, the inventory management subsystem of the main design features are:

① the daily inventory of the warehouse operations, such as inbound, outbound, mobile and other business process management, and to compile out of people into the document at the same time record of inventory accounting vouchers.

② varieties of rice and rice as well as the inventory cycle count and inventory work, the preparation of an inventory table. As the paddy and rice are divided into bags, and its different types to be classified management, in order to facilitate the inventory and out of storage management, electronic label is packaged in bags inside a bag in order to identify unique and ensure that from the package into the bag of rice to the sold out the library and finally to recycling bags all the necessary information during the acquisition. All of the electronic tag to be as far as possible identify the distance of the passive tags.

3.2 System hardware structure

(1) Master Control System. Including the host computer, network controller, a / storage gate reader and the corresponding identification antenna, wireless network connector, cargo space navigation indicators. Host computer is connected to the network controller via data lines and wireless network connector, a / storage doors and identification of reader antennas and cargo space navigation indicator connections.

(2) on-board unit. Including the vehicle control computers, monitors, wireless network connections, and identification of reader antenna, installation of a standard pallet tag, write a vehicle identification code in-vehicle electronics such as electronic tags. Vehicle unit through a wireless network connector to connect with the host system.

(3) hand-held unit. Including the integration of mobile handheld devices, handheld devices to write a code handheld electronic identification tag. Hand-held unit via a wireless network access to the master computer.

(4) The warehouse facilities. Warehouse would be classified as having a corresponding electronic code identifying the different cargo space, including live storage, cargo area, shelves and storage area for each separate goods. Management staff will Slotting Slotting electronic identification code is written to RFID tags, and cargo space identification tag encapsulated in the corresponding indicator in the cargo space navigation. Near the warehouse and the garage doors are to be wireless LAN coverage in order to achieve information sharing.

3.3 System Flow Analysis

3.3.1 The system's main business processes

According to the flow of goods, the system's main business processes as shown in Figure 1.



Figure 1 system master business processes
3.3.2 storage workflow

Storage workflow shown in Figure 2.



Figure 2 storage workflow
(1) storage preparation. Main control system will automatically derive attribute information items corresponding to each single piece of electronic goods code (or the use of the EPC code of each commodity), be written within the RFID chip, and for each storage of goods to be specify the corresponding cargo spaces.

(2) storage lists issued. Storage in electronic version to send to a single host computer, the host computer according to vehicle usage, a single designated service trucks for the storage, and electronic vehicle identification code specified in the storage sheet, while issuing a single storage to the warehouse manager.

(3) storage into the. Warehouse Manager, after receiving a single storage, storage of goods will all be placed in the designated truck; reaching the reader with the storage door, main control system through the acquisition of electronic vehicle identification code verification of a single storage permissions , verification is correct, the automatic acquisition of the truck all the goods contained in the electronic code; check whether the goods vehicle storage single match, after verification system based on pre-configured storage location of goods, through the wireless network storage approved the instruction and storage of goods yards Fanghuo bit schedules sent to vehicle control computer unit, while in all the designated open the cargo space on the navigation lights.

(4) storage shelves. Warehouse administrators scattered in the independent cargo space in the navigation light, combined with vehicle displays in the storage of goods yards Fanghuo bit schedules to determine the line of goods shelves; in this process, the vehicle identification antenna continuously identify each shelf The cargo space navigation indicator, cargo arrived at the designated parking spaces, when prompted to Warehouse Manager and is ready to goods shelves, the display will show the cargo spaces will be a detailed list of goods shelves; warehouse manager to show the detailed information of goods shelves implementation of the shelves, the main control system will automatically update the inventory records of goods, and close the corresponding cargo space navigation lights.

(5) warehousing end. After all the storage of goods shelves, storage administrators will be reaching out Koomen unladen vehicles; host system through the acquisition of electronic vehicle identification code detecting whether the goods all the shelves, and check whether the truck-load to verify correct authorized to a library , and complete the appropriate records.

3.3.3 out of library workflow

Out of library workflow shown in Figure 3.



Figure 3 library workflow
(1) Chu Kudan issued. Chu Kudan electronic version will be sent to master computer; host computer will be based on vehicle make

Use of records, this Chuku Dan designated service trucks, and electronic vehicle identification code specified in the Chu Kudan, the same time, Chu Kudan assigned to the warehouse manager.

(2) a database entry. Warehouse Manager receives Chuku Dan, will be empty trucks near the warehouse door with readers, the main control system through the acquisition of electronic vehicle identification code verification Chuku Dan authority to verify and correct database will be out of approved instructions and a schedule of library goods yards Fanghuo bit pass-board control computer and monitor to display in the car to the warehouse manager; the same time, according to a schedule of library goods yards Fanghuo bit of the goods in the warehouse where the cargo spaces, Open the corresponding cargo space navigation lights.

(3) out of library shelves. In the library district, warehouse administrators scattered in the independent cargo space in the navigation lights, combined with vehicle displays in the library of goods yards Fanghuo bit out of schedule to determine the goods off the shelf circuit; in this process, the vehicle identification antenna does not to identify the various shelves to stop cargo space navigation indicator, cargo arrived at the designated parking spaces, when prompted to Warehouse Manager and is ready to goods off the shelf, the display will show the cargo space in the next frame a detailed list of the goods; Warehouse Manager will display For more information on the shelf of goods shelves of goods and to implement the instructions on the trucks; host computer inventory records update the status of goods, close the cargo space corresponding to the navigation lights.

(4) The end of a library. All outbound goods off the shelf, the storage administrator a fully loaded truck near pools of main control system through the acquisition of electronic vehicle identification code detecting whether all the goods off the shelf; check whether all the goods contained in this truck is consistent with Chu Kudan to verify correct authorized to a library, complete the corresponding records.

3.3.4 Warehouse Management workflow

(1) database inventory. Warehouse Manager, after receiving instructions to carry hand-held cell inventory into the reservoir, the main control system will record the implementation of the inventory tasks handheld device has entered the reservoir area; followed by traversing all the cargo space and all the goods collected information through the wireless the network in real time sent to controlling computer; traverse completely the Department of cargo spaces and carry out the handheld device library, the master system will record the implementation of the inventory tasks handheld device has left the reservoir area, and will send over all the goods information and the main control computer in the inventory sheet of all the goods with each other than the contents, and inventory results to the warehouse manager.

(2) bank of shift, transfer. This operation does not increase or decrease in stocks of goods carried. In the host computer's database, only deals with the transfer of cargo space in the cargo space in which the goods information to do so to avoid the inconvenience of goods out of storage. Main control system through the transfer of goods issued instructions, combined with vehicle navigation units and cargo space indicator, control and coordinate the whole process of completing the transfer of goods,

So that it matches the host computer the contents of the database.

3.4 System Function

The system function modules are as follows:

(1) system maintenance. Including user rights management, password settings, operational logs, data backup, print settings.

(2) the basis of information management. Primarily to achieve the system's basic information management and the initial data set. Including warehouse definition, regional information, commodity information, supplier information, customer information, employee information, a storage information and category information.

(3) The warehouse management. The main achievement of the basic business of storage management is the core of the entire warehouse management. Including the storage of goods, goods out of libraries, cargo space management, inventory management, shift management, allocation management, early warning management, packaging, management, and quality control management.

(4) The query statistics, reports. Including the storage lists, and a library, assembly, demolition, reported that loss, displacement, inventory queries, etc. statistics, out of library plans, allocation of orders, transfer applications, customer orders, contracts, and other inquiries and a variety of report output.

(5) financial management. Is mainly used for simple accounting, warehousing and logistics can be managed in the balance of payments. Including the subjects setting, accounting entry, accounting management, billing inquiries, statistical summary tables, and printing documents.

(6) Other. Other ancillary items and a terminal program interfaces.

4 Summary

The author is in the innovative application of RFID warehouse management system technology in addition to investment in hardware, but also to upgrade the existing management information systems. Because only the upgrading and improvement of the existing management information systems to adapt to the characteristics of RFID technology in order to play an even greater advantage. Warehouse management system after the application of RFID technology, a number of changes in business processes, corporate insiders may take some time to adjust.