the application of barcode technology is a necessary means to realize modern management, and its advantages are well known. No matter how the industrial field develops, barcode is the only way to realize industrial automation. With the development of domestic industrial technology, many factories have realized bar code sales management, inventory management and production process management. \xd\\xd\1 Barcode and barcode technology \xd\ is to represent the data needed by the computer with a barcode, and then convert the barcode data into data that the computer can automatically read. Bar code technology includes bar code compilation rules, bar code decoding technology, bar code printing technology, data communication technology and computer technology, etc. It is a comprehensive technology. Any kind of bar code is composed of bars and spaces according to the pre-specified bar code rules and relevant technical standards. Up to now, there are more than forty bar code systems in the world. Generally, cross code 25 can be used in logistics management, which is characterized by small space occupied by symbols and high information density. According to the data structure represented by bar code symbols and the data types that can be coded, we chose the cross 25 code in the production of air conditioners. The calculation method of check bit of bar code: the sum obtained by cyclic weighting of one and three in bar code data, and then the single digit of the sum is subtracted by 1, and the obtained value is the check data of the last bit of bar code. \xd\\xd\2 barcode printing \xd\ We adopted M48 thermal transfer barcode printer of SATO company in Japan, with a printing speed of 125mm/s, which is flexible in format, high in image quality, low in printing cost, convenient and reliable in use and low in failure rate. Its disadvantage is that the speed of this printer is a little slow. It finishes bar code printing under the control of microcomputer. We have equipped the Japanese NEC PC 98INS/E2 portable computer (with 2M hard disk and 4M memory). Bar code software is generally compiled in BASIC language, which is relatively simple. Considering the printer's ability to handle Chinese characters, it is best to choose a bar code printer that can handle the secondary Chinese character library driven by a common microcomputer. In addition to the bar code, the bar code label should also include some necessary information, such as the manufacturer's trademark nameplate, etc. It can also be completed by the manufacturer of self-adhesive bar code paper tape on the printing carrier in advance. \xd\\xd\3 Barcode recognition \xd\ Barcode recognition is accomplished by barcode reader, which can be divided into photoelectric scanner and decoder, and generally combined together. The MS72 reader of METROLOGIC Company of the United States is an online laser scanning reader, with a scanning speed of 2 lines per second and a reliable scanning distance of 7 ~ 15 inches. There are 2 laser scanning lines in the scanning area, which scan the bar code in five directions, communicate with the computer through RS-232 interface, and 12 bar code systems can be selected with DIP switch. The task of the decoder is to convert the signals generated by the scanner into data that can be recognized by the computer according to a certain bar code decoding principle, and then transmit them to the computer. The decoder function is usually realized by the microprocessor running corresponding software. A new bar code reader must be initialized according to the code system selected by the user: set the bar code system → data transmission rate → bar code character length → define parity bits → interface type between the bar code reader and the computer in turn. The decoder can only recognize the bar code system selected by the user after initialization programming. Usually, the bar code reader is connected to a microcomputer or a computer terminal, as long as its output is connected to the parallel interface or RS-232 serial port on the microcomputer or terminal. \xd\\xd\4 Verification of barcodes \xd\ In order to ensure the printing quality of barcodes, the printed barcodes should be verified regularly. Generally, a light pen barcode scanner can be prepared. If TBR-11 or THS-21S can meet the requirements, if conditions permit, a high-grade bar code tester, such as CODEBARⅡ, can be further prepared: the wavelength of light source is 633mm (red light)/／9mm (infrared light), the resolution is 25μm, the measurement accuracy is 75 μ m, the reflectance measurement range is -1%, and the accuracy is 2%. If it is matched, 5 The composition of the bar code application system (as shown in the figure) 6 Some experiences in the application of bar code technology. Since 1994, we have taken the lead in using bar codes in the production of air conditioners and achieved success at one time. Over the past few years, I have accumulated some experience in the promotion and application, mainly including the following: \ xd \ xd \ ① The importance of popularizing barcode knowledge. In the promotion and use, people in management and operation should understand the principle of barcode, why barcode technology should be applied and its function in computer system, and the application of barcode technology will produce efficiency in production management and quality management, so that everyone can pay attention to this work ideologically. \xd\② The application of bar code must be closely coordinated by all departments. The application of bar code involves many links, such as product number, bar code printing, bar code pasting, bar code scanning and so on. It can only be completed by the division of labor and cooperation of production department, quality inspection department and equipment department. Generally, bar codes of products are printed in a centralized way. The specific printing quantity and pasting can be completed by the production workshop, and special personnel should be appointed to operate and maintain them, and technical training should be given to them. The bar code scanning should be completed by the quality inspection department. When the bar code information is wrong, it needs to be handled in time, and it needs the coordination and full support of the upper leaders. \xd\③ Using bar code to manage effectively through computer system is the key to the application of bar code technology. The purpose of applying bar code technology to manage is not only to ensure the fast and accurate input of product information to prevent loopholes caused by manual input, but also to provide managers with various data of each product. We used bar code technology in the commodity inspection of air conditioners, and established quality files for each product before leaving the factory, which effectively provided various information. \xd\④ To formulate rules and regulations for barcode management, barcode application must follow certain rules and conform to its scientificity, and establish the coding system of the whole product, internal barcode generation rules, barcode printing system, barcode paste specification, barcode use system for products, and take the barcode utilization rate of the production workshop as an economic and technical index to assess.