1、INTERNATIONAL STANDARD ISO/IEC 6429 Third edition 1992-l 2-l 5 Information technology - Control functions for coded character sets Technologies de /information - Fonctions de commande pour /es jeux de caractkres cod - texts like the above with a horizontal line orientation and a top-to-bottom line p
2、rogression. The control functions defined in this International Standard are intended to be used embedded in character-coded data for interchange, in particular with character-imaging devices. In general, the control functions are defined by their effects on a character-imaging input/output device.
3、It is, therefore, necessary to make certain assumptions about the architecture of such a device. These assumptions are as unrestrictive as possible: they are specified in clause 6. In addition to being performed the control functions may need to be represented by a graphic symbol. The structure of t
4、his International Standard is open-ended, so that more control functions can be included in future editions. Other standards specifying control functions may define more restricted definitions of them than those in this International Standard. The devices to which this International Standard applies
5、 can vary greatly from each other depending on the application for which a device has been specifically designed. It is technically and economically impractical for one device to implement all the facilities specified in this International Standard. The intention is that in any type of device only a
6、 limited selection of the facilities appropriate to the application will be implemented. 2 Conformance 2.1 Types of conformance Full conformance to a standard means that all of its requirements are met. Conformance will only have a unique meaning if the standard contains no options. If there are opt
7、ions within the standard they must be clearly identified, and any claim of conformance must include a statement that identifies those options that have been adopted. This International Standard is of a different nature since it specifies a large number of facilities Tom which different selections ma
8、y be made to suit individual applications. These selections are not identified in this International Standard, but must be identified at the time that a claim of conformance is made. Conformance to such an identified selection is known as limited conformance. The facilities selected for a particular
9、 application may be registered according to IS0 2375 for ease of reference in information interchange. 2.2 Conformance of information interchange A CC-data-element within coded information for interchange is in conformance with this International Standard if the coded representations of control func
10、tions within that CC-data-element satisfy the following conditions: a) a coded representation of a control function that is specified in this International Standard shall always represent that control function; b) a control function that is specified in this International Standard shall always be re
11、presented by the coded representation that is specified in this International Standard for that control function: c) any coded representation that is reserved for future standardization by this International Standard shall not appear. 1 ISO/lEC 6429:1992 Q c) any coded representation that is reserve
12、d for future standardization by this International Standard shall not appear. Coded representations of control functions and modes not specified in this International Standard may appear in interchanged information subject to the above conditions (see 5.4.5.4.1 and 7.4). 2.3 Conformance of devices A
13、 device is in conformance with this International Standard if it conforms to the requirements of 2.3.1, and either or both 2.3.2 and 2.3.3. Any claim of conformance shall identify the document which contains the description specified in 2.3.1. 23.1 Device description A device that conforms to this I
14、nternational Standard shall be the subject of a description that: 9 identities, by reference to the clauses of, or to the control functions specified in this International Standard, the selection of control functions, the coded representations of which the device can originate or can receive and int
15、erpret ii) identifies the means by which the user may supply the corresponding control functions, or may recognize them, as specified respectively in 2.3.2 and 2.3.3 below. 2.3.2 Oriinating devices An originating device shall be capable of transmitting within a CC-data-element the coded representati
16、ons of an identified selection of control functions, and of their parameter values (including mode selection parameters), conforming to this International Standard. Such a device shall allow the user to supply any control function that he chooses from among the identified selection for the purpose o
17、f transmitting its coded representation over the coding interface. 2.3.3 Receiving devices A receiving device shall be capable of receiving within a CC-data-element and interpreting the coded representations of an identified selection of control functions, and of their parameter values (including mo
18、de selection parameters), conforming to this International Standard. If the identified selection contains a control sequence for which a default value for a parameter is specified in this International Standard, the identified selection shall include the default value both in explicit and in implici
19、t representations. Such a device shall make available to the user any control function that is within the identified selection, and the coded representation of which is received over the coding interface, in such a form that the user can recognize it from among the control functions within the ident
20、ified selection. 3 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreement
21、s based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standards listed below. Members of lEC and IS0 maintain registers of currently valid International Standards. IS0 1745:1975, Information processing -Basic mode control proc
22、edures for data communication systems. IS0 2022: 1986, Iformution prmmsing - IS0 7-bit trncl 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. 43.19 Coded-character-data-element (CC-data-ele
23、ment): An element of interchanged information that is specified to consist of a sequence of coded representations of characters, in accordance with one or more identified standards for coded character sets. NOTE 1 III a cmnmtmication mvinmmmt according to the tefetmcz model for Open Systam Interr*Mn
24、cclion of IS0 7498, a CC-data-elanent will form all or patt of the infommtion that corresponds to the Fresentation-Rotoeol-n-Protocol-Wta-Units (PFDU) MI ia that International Standard. NOTE 2 When iaformation interchange is aaa3mpliskd by means of intctdangcabie media, a CC-data-eknent will form al
25、l or part of the infomdion that oxfespoti to the user data, and not that tecordcd during formatting and initialization. 4.2.20 Code extension: The techniques for the encoding of characters that are not included in the character set of a given code. 4.2.21 Code table: A table showing the character al
26、located to each bit combination in a code. 4.2.22 Control character: A control function the coded representation of which consists of a single bit combination. 4.2.23 Control function: An action that affects the recording, processing, transmission, or interpretation of data, and that has a coded rep
27、resentation consisting of one or more bit combinations. 4.2.24 Control sequence: A string of bit combinations starting with the control function CONTROL SEQUENCE INTRODUCER (CSI), and used for the coded representation of control functions with or without parameters. 4.235 Control string: A string of
28、 bit combinations which may occur in the data stream as a logical entity for control Purposes- 4.226 Cursor: A special indicator used in a display to mark the active presentation position. 4.2.27 Data component: The device component which is used for storing the received data for further presentatio
29、n processing. 4.2.28 Decimal mark: A graphic symbol, usually a FULL STOP or a COMMA, used to separate the fractional part of a decimal number from the integer part of that number. 4.2.29 Default: A value or a state that is to be assumed when no value or state is explicitly specified. 4.2.30 To delet
30、e: To remove the contents from character positions and closing the resulting gap by moving adjacent graphic characters into the empty positions. 43.31 To designate: To identify a set of characters that are to be represented, in some cases immediately and in others on the occurrence of a further cont
31、rol function, in a prescribed manner. 4.2.32 Device: A component of information processing equipment which can transmit, and/or receive, coded information within CC-data-elements. NOTE - It may he II hplvwtplt device in the convmtiond sense, or a poau such as an application program or gateway Won. 4
32、3.33 Display: The region for visual presentation of data on any type of character-imaging device, including printer, cathode ray tube and similar devices. 4.2.34 Editor function: A control function used for editing, altering or transposing the visual arrangement of data. 4 lso/IJx 6429:1992 Q 43.35
33、Eligible: The term used to denote an area considered for transmission or transfer. 4.2.36 Environment: The characteristic that identifies the number of bits used for representing a character in a data processing or data communication system or in a part of such a system. 4.2.37 To erase: To remove t
34、he contents from character positions and leaving the resulting gap open. 4.238 Escape sequence: A string of bit combinations that is used for control purposes in code extension procedures. The first of these bit combinations represents the control function ESCAPE 4.2.39 Fiekl: An area consisting of
35、the character position at a character tabulation stop (beginning of the field) and the character positions up to, but not including, the character position at the following character tabulation stop (end of the field). 43.40 Final Byte: The bit combination that terminates an escape sequence or a con
36、trol sequence. 43.41 Formator function: A control function (format effector or presentation control function) describing how the originator of the data stream wishes the information to be formatted or presented. 4.2.42 Graphic character: A character, other than a control function, that has a visual
37、representation normally hand- written, printed or displayed, and that has a coded representation consisting of one or more bit combinations. 4.2.43 Graphic rendition: The visual style of displaying a set of graphic symbols. 4.2.44 Graphic symbol: A visual representation of a graphic character or of
38、a control function. 4.2.45 Guarded area: A special case of a qualitied area, the contents of which may be excluded from transmission as a data stream and from transfer to an auxiliary input/output device. 4.2.46 Initial state: The state a device has after it is made operational. It is the recommende
39、d “reset” state of the modes. 4.2.47 Intermediate Byte: a) In an Escape Sequence, a bit combination that may occur between the control function ESCAPE SC) and the Final Byte. W In a Control Sequence, a bit combination that may occur between the control function CONTROL SEQUENCE INTRODUCER (CSI) and
40、the Final Byte, or between a Parameter Byte and the Final Byte. 4.2.48 To invoke: To cause a designated set of characters to be represented by the prescribed bit combinations whenever those bit combinations occur. 4.2.49 Line: A set of a consecutive character positions. 4.2.50 Line home position: A
41、reference position on a line in the data component ahead of which the active data position can normally not be moved. A reference position on a line in the presentation component ahead of which the active presentation position can normally not be moved 4.2.51 Line limit position: A reference positio
42、n on a line in the data component beyond which the active data position can normally not be moved. A reference position on a line in the presentation component beyond which the active presentation position can normally not be moved 4.2.52 Line orientation: The term used to describe the way in which
43、a line will appear in the graphic image output. In this International Standard, line orientation may only be vertical or horizontal. 4.2.53 Line progression: The direction of presentation of successive lines. 4.2.54 Operating system: The software that controls the execution of computer programs and
44、that may provide scheduling, debugging, input/output control, accounting, compilation, storage assignment, data management, and related services. 4.2.55 Page: A set of consecutive lines. 4.2.56 Page home position: A reference position on a page in the data component ahead of which the active line (t
45、he line that contains the active data position) can normally not be moved. A reference position on a page in the presentation component ahead of which the active line (the line that contains the active presentation position) can normally not be moved. ISODEC 6429: 1992 Q 4.2.57 Page hit position: A
46、reference position on a page in the data component beyond which the active line (the line that contains the active data position) can normally not be moved. A reference position on a page in the presentation component beyond which the active line (the line that contains the active presentation posit
47、ion) can normally not be moved. 43.58 Parameter Byte: In a control sequence, a bit combination that may occur between the control function CONTROL SEQUENCE INTRODUCER (CSI) and the Final Byte, or between CSI and an Intermediate Byte. 4.2.59 Presentation component: The device component which is used
48、for producing the graphic image output. 4.260 Private (or experimental) use: The means of representing a non-standardized control function or mode in a manner compatible with this International Standard. 4.2.61 Protected area: A special case of a qualified area, the contents of which are protected a
49、gainst manual alteration and may also be protected against erasure. 4.2.62 Qualified area: A string of character positions with which certain characteristics are associated. 4.2.63 Repertoire: A specified set of characters that are represented by one or more bit combinations of a coded character set. 4.2.64 Scroll: The action whereby all, or part of, the graphic symbols of a display are moved in a specified direction. 4.2.65 Selected area: A string of character positions, the contents of which may be eligible to be transmitted in the form of a data stream or to bc transferred to an auxi
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