ANSI INCITS ISO 9036-1987 Information processing - Arabic 7-bit coded character set for information interchange.pdf
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1、INTERNATIONAL STANDARD Information processing - Arabic 7-bit coded character set for information interchange Jeu de caracthres arabes cod code code extension . code table . control character . control function graphic character . graphic symbol . position . . . . . . . . . . . . . 1 . 1 1 . . 1 . 1
2、. 1 1 . . 2 . . 2 . . 2 5 Specification of the coded character set . . . . . . . . . . . . . . . 2 5.1 Control characters 2 5.2 Character SPACE . 4 5.3 Graphic characters. . 4 6 Composite graphic characters. 7 7 Vowel characters 7 8 Designation of the character set of this International Standard . .
3、 . . . . 7 9 Codetable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 10 Description of the control characters . . . . . . . . . . . . . . . . . . . . . 9 10.1 ACK ACKNOWLEDGE . 10.2 BEL BELL. 10.3 BS BACKSPACE . . . . 10.4 CAN CAN
4、CEL . 10.5 CR CARRIAGE RETURN 10.6 DC1 DEVICE CONTROL ONE 10.7 DC2 DEVICE CONTROL TWO 10.8 DC3 DEVICE CONTROL THREE 10.9 DC4 DEVICE CONTROL FOUR. 10.10 DEL DELETE 10.11 DLE DATA LINK ESCAPE. . . . . 9 9 9 9 9 9 9 9 9 9 9 iii IS0 9636: 1987 (E) 10.12 10.13 10.14 10.15 10.16 10.17 10.18 10.19 10.20 10
5、.21 10.22 10.23 10.24 10.25 10.26 10.27 10.28 10.29 10.30 10.31 10.32 10.33 EM ENDOFMEDIUM . ENQ ENQUIRY . EOT END OF TRANSMISSION . ESC ESCAPE . ETB END OF TRANSMISSION BLOCK ETX END OF TEXT. . FF FORMFEED . HT HORIZONTAL TABULATION . IS1 (US) INFORMATION SEPARATOR ONE (UNIT SEPARATOR). IS2 IRS) IN
6、FORMATION SEPARATOR TWO (RECORD SEPARATOR) IS3 (GS) INFORMATION SEPARATOR THREE (GROUP SEPARATOR) . IS4 (FS) INFORMATION SEPARATOR FOUR (FILE SEPARATOR). LF LINEFEED NACK NEGATIVE ACKNOWLEDGE . NUL NULL . SI SHIFT-IN SO SHIFT-OUT . SOH START OF HEADING. STX START OF TEXT . SUB SUBSTITUTE CHARACTER .
7、 SYN SYNCHRONOUS IDLE VT VERTICAL TABULATION . 9 9 9 9 9 9 9 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 11 Peculiarities relating to the conventional direction of Arabic writing . . . . . 10 INTERNATIONAL STANDARD IS0 9036 : 1967 (E) Information processing - Arabic 7-bit coded character set for in
8、formation interchange 1 Scope and field of application 1.1 This International Standard specifies a set of 120 characters (control characters and graphic characters such as letters, digits and symbols) with their coded representation. These characters are mandatory and unchangeable. 1.2 This characte
9、r set is primarily intended for the inter- change of information using the Arabic language among data processing systems and associated equipment, and within data communication systems. The need for graphic characters and control functions in data processing has also been taken into account in deter
10、mining this character set. 1.3 This character set includes control characters for code extension where its 120 characters are insufficient for particular applications. Procedures for the use of these control characters are specified in IS0 2022. 1.4 The definitions of some control characters in this
11、 Inter- national Standard assume that data associated with them are to be processed serially in a forward direction. When they are included in strings of data which are processed other than serially in a forward direction or when they are included in data formatted for fixed-record processing they m
12、ay have undesirable effects or may require additional special treatment to ensure that they result in their desired function. 2 Conformance and implementation 2.1 Conformance A coded character set is in conformance with this International Standard if it comprises the characters listed in clause 5 wi
13、th the specified coded representation. Equipment claimed to implement this International Standard shall be able to interchange information by means of this 7-bit coded character set. 2.2 Implementation The use of this character set requires definitions of its im- plementation in various media. For e
14、xample, these could in- clude punched tapes, punched cards, magnetic media and transmission channels, thus permitting interchange of data to take place either indirectly by means of an intermediate recor- ding in a physical medium, or by local connection of various units (such as input and output de
15、vices and computers) or by means of data transmission equipment. The implementation of this coded character set in physical media and for transmission, taking into account the need for er- ror checking, is the subject of other International Standards. 3 References IS0 646, Information processing - I
16、S0 7-bit coded character set for information interchange. IS0 2022, Information processing - IS0 7-bit and B-bit coded character sets - Code extension techniques. Arab Standard ASMO 449. International Register of Coded Character Sets to Be Used with Escape Sequences. 4 Definitions For the purpose of
17、 this International Standard the following definitions apply. 4.1 bit combination : An ordered set of bits that represents a character or is used as part of the representation of a character. 4.2 character: A member of a set of elements used for the organization, control or representation of data. 4
18、.3 coded character set; 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. 4.4 code extension: The techniques for the encoding of characters that are not included in the character set of a gi
19、ven code. 4.6 code table: A table showing the character allocated to each bit combination in a code. 4.6 control character: A control function the coded representation of which consists of a single bit combination. 4.7 control function: An action that affects the recording, pro- cessing, transmissio
20、n or interpretation of data and that has a coded representation consisting of one or more bit combinations. 1 IS0 9038: 1987 (E) 4.8 graphic character: A character, other than a control function, that has a visual representation normally handwritten, printed or displayed. 4.9 graphic symbol: A visua
21、l representation of a graphic character or of a control function. 4.10 position: That part of a code table identified by its column and row co-ordinates. 5 Specification of the coded character set The bits of the bit combinations of the 7-bit code are identified by b7, bs, ba, b, bs, b2 and bf, wher
22、e b7 is the highest-order or most-significant bit and b, is the lowest-order, or least- significant bit. The bit combinations may be interpreted to represent integers in the range 0 to 127 in binary notation by attributing the follow- ing weights to the individual bits: Bit: b be b, b, “3 b “1 Weigh
23、t: 1 64 1 32 1 16 1 8 1 4 1 2 1 1 In this International Standard, the bit combinations are iden- tified by notation of the form x/y, where x is a number in the range 0 to 7 and y is a number in the range 0 to 15. The cor- respondence between the notations of the form x/y and the bit combinations con
24、sisting of the bits b7 to b, is as follows: - x is the number represented by b, bs and b5 where these bits are given the weights 4, 2 and 1 respectively; - y is the number represented by b, bs, b2 and b, where these bits are given the weights 8, 4, 2 and 1 respectively. The notations of the form x/y
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