ANSI INCITS ISO 4873-1991(R2003) for Information Processing - Bit Code for Information Interchange Structure and Rules for Implementation《信息技术用美国国家标准.实施用信息交换结构和规则的位码》.pdf
《ANSI INCITS ISO 4873-1991(R2003) for Information Processing - Bit Code for Information Interchange Structure and Rules for Implementation《信息技术用美国国家标准.实施用信息交换结构和规则的位码》.pdf》由会员分享,可在线阅读,更多相关《ANSI INCITS ISO 4873-1991(R2003) for Information Processing - Bit Code for Information Interchange Structure and Rules for Implementation《信息技术用美国国家标准.实施用信息交换结构和规则的位码》.pdf(30页珍藏版)》请在麦多课文档分享上搜索。
1、INCITS/ISO 4873-1991 (R2003)(formerly ANSI/ISO 4873-1991(R1998)for Information Processing -Bit Code for Information InterchangeStructure and Rules for ImplementationCopyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking perm
2、itted without license from IHS-,-,-Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-American National Standard for Information Processing - Bit Code for Information Interchange -
3、Structure and Rules for Implementation Secretariat Computer and Business Equipment Manufacturers Association Approved January 28,1993 American National Standards Institute, Inc. Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or ne
4、tworking permitted without license from IHS-,-,-AmericanNationalStandardApproval of an American National Standard requires review by ANSI that therequirements for due process, consensus, and other criteria for approval havebeen met by the standards developer.Consensus is established when, in the jud
5、gment of the ANSI Board of StandardsReview, substantial agreement has been reached by directly and materiallyaffected interests. Substantial agreement means much more than a simplemajority, but not necessarily unanimity. Consensus requires that all views andobjections be considered, and that a conce
6、rted effort be made toward theirresolution.The use of American National Standards is completely voluntary; their existencedoes not in any respect preclude anyone, whether he has approved the standardsor not, from manufacturing, marketing, purchasing, or using products, processes,or procedures not co
7、nforming to the standards.The American National Standards Institute does not develop standards and will inno circumstances give an interpretation of any American National Standard.Moreover, no person shall have the right or authority to issue an interpretation ofan American National Standard in the
8、name of the American National StandardsInstitute. Requests for interpretations should be addressed to the secretariat orsponsor whose name appears on the title page of this standard.CAUTION NOTICE: This American National Standard may be revised orwithdrawn at any time. The procedures of the American
9、 National StandardsInstitute require that action be taken periodically to reaffirm, revise, or withdrawthis standard. Purchasers of American National Standards may receive currentinformation on all standards by calling or writing the American National StandardsInstitute.Published byAmerican National
10、 Standards Institute11 West 42nd Street, New York, New York 10036Copyright 1991 by Information Technology Industry Council (ITI)All rights reserved.These materials are subject to copyright claims of International Standardization Organization (ISO),American National Standards Institute (ANSI), and In
11、formation Technology Industry Council (ITI). Not forresale. No part of this publication may be reproduced in any form, including an electronic retrieval system,without the prior written permission of ITI. All requests pertaining to this standard should be submitted toITI, 1250 Eye Street NW, Washing
12、ton, DC 20005.Printed in the United States of AmericaCopyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright American National Standards Institute Provided by IHS under license
13、 with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Contents 2 Conformance and implementation 2.1 Conformance 2.1.1 Conformance of information interchange 2.1.2 Conformance of devices 22 Implementation 3 Normative references 4 Definitions 4.1 active position
14、4.2 bit combination 4.3 byte 2 4.4 character 4.5 character position 4.6 coded-character-data-element (CC-data-element) 4.7 coded character set 4.8 code extension 4.9 code table 4.10 control character 4.11 control function 4.12 device 4.13 escape sequence 4.14 Final Byte 4.15 graphic character 4.16 g
15、raphic symbol 4.17 repertoire 4.18 user 3 S Notation, code table and names 5.1 Notation S.2 Code table 5.3 Names 6 Structure of the code : A set of unambiguous rules that establishes a character set and the one-to- one relationship between the characters of the set and their bit combinations. 4.8 co
16、de extension : The techniques for the encoding of characters that are not included in the character set of a given code. 4.9 code table : A table showing the character allocated to each bit combination in a code. 4.10 control character : A control function the coded representation of which consists
17、of a single bit combination. 4.11 control function : An action that affects the recording, processing, transmission, or interpretation of data, and that has a coded representation consisting of one or more bit combinations. 4.12 device : A component of information processing equipment which can tran
18、smit. and/or receive, coded information within CC-data-elements. NOTE -It may be an input/output device in the conventional sense, or a process such as an application program or gateway function. 4.13 escape sequence : A string of bit combinations that is used for control purposes in code extension
19、procedures. The first of these bit combinations represents the control function ESCAPE. 4.14 Final Byte : The bit combination that terminates an escape sequence or a control sequence. 4.15 graphic character : A character, other than a control function. that has a visual representation normally handw
20、ritten, printed or displayed, and that has a coded representation consisting of one or more bit combinations 4.16 graphic symbol : A visual representation of a graphic character or of a control function. 4.17 repertoire : A specified set of characters that are represented by means of one or more bit
21、 combinations of a coded character set. 4.18 user : A person or other entity that invokes the services provided by a device. NOTES 1. This entity may be a process such as an application program if the “device” is a code convertor or a gateway function, for example. 2. The characters, as supplied by
22、the user or made available to him, may be in the form of codes local to the device, or of non-conventional visible representations, provided that 2.1.2 above is satisfied. 5 Notation, code table and names 5.1 Notation The bits of the bit combinations of the - yy is the number represented by b, b, b,
23、 and b, where these bits are given the weights 8, 4,2 and 1 respectively. The notations of the form xx/yy are the same as the ones used to identify code table positions, where xx is the column number and yy is the row number (see 5.2). 5.2 Code table An 8-bit code table consists of 256 positions arr
24、anged in 16 columns and 16 rows. The columns and rows are numbered 00 to 15. The code table positions are identified by notations of the form xw/yy, where xx is the column number and yy is the row number. The positions of the code table are in one-to-one correspondence with the bit combinations of t
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