【文章內(nèi)容簡介】 has it all from the 1k~4MB character position each kind of capacity specification variety. Moreover the operation is simple, causes the system the request also correspondingly to reduce. If the IC card internal storage information is extremely important, 無 錫 職 業(yè) 技 術(shù) 學(xué) 院 畢業(yè)設(shè)計說明書（英文翻譯） 6 needs to carry on the person to distinguish, moreover also needs to distinguish the readwrite connection the validity, not only needs to carry on the district lamination to the card internal document and the record the control management, but also must carries on each kind of and operation authorization password control visit to various districts or various application layers document and so on, then should choose brings the CPU IC cards. IC the card readwrite machines and tools choice IC card readwrite machines and tools from generally speaking may divide into two big kinds: Specialpurpose IC card readwrite machines and tools and versatile IC card readwrite machines and tools. Specialpurpose IC card readwrite machines and tools: In view of some kind of concrete application, itself has pletes between the IC card and the application system the data readwrite exchange, the instruction, the transaction putation, aspect plete function and so on operation control implementing agency IC card machines and tools bees the specialpurpose IC card readwrite machines and tools or the application dedicated terminal. Versatile IC card readwrite: Has generally pletes with the IC card between the data readwrite exchange function. Not only it is restricted in some kind of concrete application domain, usually designs the standard puter peripheral the form, namely uses conforms to the puter industry standard RS2320 connection or uses ATBUS for its correspondence inputoutput channel (flapper) the structure for the data input output connection. This kind of IC card readwrite machines and tools have directly connect generally with the microputer, constitute take the microputer as the control center IC card application system. IC the card Booth form choice In aspects and so on machines and tools design and practical application operation request mainly should consider the following several factors to Booth39。s choice: (1)Basis card machine contour limit and the electric appliance performance requirement, choose Booth39。s contour service life number of times. (2)Has in the use according to the machines and tools to insert pulls out the IC card the use frequency, chooses Booth39。s service life number of times. (3) Considered Booth wears the card performance in the operating process to the card and the outward appearance influence which causes, chooses Booth39。s contact form. In (4) consideration application system the cardholder operates the behavior (service person to operate or cardholder voluntarily operates) 無 錫 職 業(yè) 技 術(shù) 學(xué) 院 畢業(yè)設(shè)計說明書（英文翻譯） 7 the influence which possibly creates to the system safety, chooses whether needs to spring the control or other housekeeping operation function automatically. (5) Consideration card arriving signal positions Chang Kai Xing or often close mold , in order to coordinates the machines and tools well the circuit design and data gathering and the control. work connection choice Here work architecture refers to the work connection function which IC card readwrite machines and tools itself supports. In the practical application system, between the IC card terminal device data piles with the data transfer also often uses the work mailing address. It self has installed the work connection in many specialpurpose IC card readwrite machines and tools. Synthesizes each kind of machines and tools the design and the actual system use situation, at present IC card readwrite machines and tools itself has the work connection is generally RS 232 connections or the standard RS485 connection, may support constitutes the small scope main line structure or travels at night the structure the confined work. Regarding has the accurate RS232 connection or standard RS232 the connection IC card readwrite machines and tools and the microputer together through together the multiuser interface control extender board, in under the multiuser software support, may constitute a small scope to travel at night the structure the work system. Multiuser control extender board uses which for the microputer, has the Chinese red army soldier or 16 groups serial port expansion ability generally. In the actual course of munications, the star type structure has realized the pointtopoint correspondence connection. The signal distance is a RS232 connection existence question. At present may use the solution is direct Canada ties the longline driver to increase the connection driving force. Regarding has standard RS485 the connection IC card readwrite machine and the microputer together through together the RS485 specialpurpose control extender board, in actuates the software correspondingly under the support, may constitute a main line structure work system.. The RS485 control panel uses which for the microputer has Shan Kou Huo generally the pair of mouth connection. Each single mouth may hang the knot 32 terminals. If is the pair of mouth output, then may bring two main lines, namely altogether may hang meets 64 terminals. In the main line way, various terminal device all is hangs parallel meets on the main line, therefore in information transmission time, assumes the broadcast way. Namely when an equipment transmits the information to the main line on, on all main line equipment has the opportunity to obtain the information. That equipment which but obtains the information equipment only to be able truly to be the equipment address with which trans