SIST ISO/IEC 2022:1995

lSO/IEC
INTERNATIONAL
2022
STANDARD
Fourth edition
1994-12-01
Information technology - Character code
structure and extension techniques
- Structure de code de caract&es et
Technologies de I’informa tion
techniques d’extension
Reference number
ISO/l EC 2022: 1994(E)

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ISO/IEC 2022: 1994 (E)
Contents
Page
1
Section 1 - General
1
1 Scope
2
2 Conformance
2
2.1 Types of conformance
2
2.2 Conformance of information interchange
2
2.3 Conformance of devices
2
2.3.1 Device description
2
2.3.2 Originating devices
2
2.3.3 Receiving devices
3
3 Normative references
3
4 Definitions
3
4.1 bit combination
3
4.2 byte
3
4.3 character
3
4.4 coded-character-data-element (CC-data-element)
3
4.5 coded character set; code
3
4.6 code extension
3
4.7 code table
3
4.8 combining character
3
4.9 control character
3
4.10 control function
3
4.11 to designate
4
4.12 device
4
4.13 escape sequence
4
4.14 Final Byte
4
4.15 graphic character
4
4.16 graphic symbol
4
4.17 Intermediate Byte
4
4.18 to invoke
4
4.19 repertoire
4
4.20 to represent
4
4.21 user
4
5 Notation, code tables and names
4
5.1 Notation
5
5.2 Code tables
5
5.3 Names of characters
6
Section 2 - Character sets and codes
6
6 Characters and character sets
@ ISO/IEC 1994
All rights resewed. No part of this publication may be reproduced or utilized in any form or
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mission in writing from the publisher
ISO/IEC Copyright Office * Case Postale 56 * CH-1211 Gen&ve 20 * Switzerland
Printed in Switzerland
ii

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ISO/IEC 2022: 1994 (E)
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6
character sets
6.1 of characters and
Types
6
6.2 Fixed coded characters
6
6.2.1 Character DELETE
6
6.2.2 Character ESCAPE
6
6.2.3 Character SPACE
6
6.3 Sets of coded graphic characters
6.3.1 Types of coded graphic character set
6.3.2 Contents of a coded graphic character set
6.3.3 Combination of graphic characters
6.3.4 Sources of coded graphic character sets
9
6.4 Sets of coded control functions
9
6.4.1 Types of coded control function set
10
6.4.2 Primary sets of coded control functions
10
6.4.3 Supplementary sets of coded control functions
10
6.4.4 Sources of coded control function sets
11
6.5 Coded single additional control functions
11
6.5.1 Standardized single control functions
11
6.5.2 Registered single control functions
11
6.5.3 Private control functions
11
6.5.4 Sources of coded single control functions
11
7 The elements of S-bit and 7-bit codes
11
7.1 Summary of the elements
12
7.2 Character-set code elements
13
7.3 Invocation of character-set code elements
13
7.4 Coded code-identification functions
14
7.5 Unique coding of graphic characters
14
8 Structure of S-bit codes
14
8.1 Code table layout for &bit codes
15
8.2 Elements and structure of the code
15
8.3 Invocation of graphic character sets by means of shift functions
15
8.3.1 LOCKING-SHIFT ZERO, . . ONE, . . TWO, and . . THREE
16
8.3.2 LOCKING SHIFT ONE RIGHT, . . TWO RIGHT , and . . THREE RIGHT
16
8.3.3 Shift status
18
8.3.4 Interactions of locking-shift functions
18
8.4 Invocation of single graphic characters means of shift functions
by
18
Invocation sets of control functions
8.5 of
18
8.5.1 Invocation of the CO code element
18
8.5.2 Invocation of the Cl code element
19
9 Structure of 7-bit codes
19
9.1 Code table layout for 7-bit codes
19
9.2 Elements and structure of the code
22
9.3 Invocation of graphic character sets by means of shift functions
22
9.3.1 SHIFT-IN, SHIFT-OUT, LOCKING-SHIFT TWO, and LOCKING-SHIFT THREE
22
9.3.2 LOCKING SHIFT ONE RIGHT, TWO RIGHT, and THREE RIGHT
22
9.3.3 Shift status
22
9.3.4 Interactions of locking-shift functions
. . .
111

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0 1s0/IEc
ISO/IEC 2022: 1994 (E)
22
functions
single graphic characters means of shift
9.4 Invocation of
bY
23
functions
9.5 Invocation of sets of control
23
9.5.1 Invocation of the CO code element
23
9.5.2 Invocation of the Cl code element
23
10 Versions and levels of implementation
23
10.1 Versions
23
10.2 Identification of code structure facilities and character sets
24
10.3 Levels of implementation
24
10.3.1 &bit codes
24
10.3.2 Qualification of levels for &bit codes
25
10.3.3 7-bit codes
25
11 Transformation between 8-bit and 7-bit codes
25
11.1 Transformation from &bit to 7-bit codes
26
11.2 Transformation from 7-bit to 8-bit codes
27
Section 3 - Code identification and escape sequences
27
12 Code-identification functions
27
12.1 Purposes of code-identification functions
27
12.2 Relationship to escape sequences
27
13 Structure and use of escape sequences
27
13.1 Structure of escape sequences
27
13.2 Types of escape sequences
27
13.2.1 Indication of type
28
13.2.2 Escape Sequences of types nF
29
13.2.3 Escape Sequences of type 4F
30
13.2.4 Summary
30
13.2.5 Notation of escape sequences
31
13.3 Specific meanings of escape sequences
31
13.3.1 Registration of Final Bytes
32
13.3.2 Final Bytes specified in this International Standard
32
13.3.3 Private use
32
14 Designation of sets of graphic characters and control functions
32
14.1 Designation functions
33
14.2 Designation of sets of control functions (CZD, ClD)
33
14.2.1 Purpose
33
14.2.2 Designation of CO
33
14.2.3 Designation of Cl
33
14.3 Designation of sets of graphic characters (GnDm and GnDMm)
33
14.3.1 Purpose
34
14.3.2 Specifications
35
14.3.3 Size indication for multiple-byte sets
35
14.4 Dynamically redefinable character sets (DRCS)
35
14.4.1 Purpose
35
14.4.2 Specification
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ISO/IEC 2022: 1994 (E)
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14.5 Identification of revisions of registered character sets (IRR)
35
14.5.1 Purpose
35
14.5.2 Specification
36
15 Code announcement and switching
36
15.1 Summary of functions provided
36
15.2 Announcement of code structure facilities (ACS)
36
15.2.1 Purpose
36
15.2.2 Specification
40
15.3 Data Delimiter for this Coding Method (CMD)
40
15.3.1 Purpose
40
15.3.2 Specification
40
15.4 Designation of Other Coding Systems (DOCS)
40
15.4.1 Purpose
40
15.4.2 Specification
ANNEXES
42
A - External references to character repertoires and their coding
45
B - The IS0 International register of coded character sets to be used with escape sequences
46
C - Main differences between the 3rd edition (1986) and the present edition of this International Standard
47
D - Bibliography

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ISOLIEC 2022: 1994 (E) 0 ISOnEC
Foreword
IS0 (the International Organisation for Standardisation) and IEC (the International Electrical Commission) form the
specialised system for world-wide standardisation. National Bodies that are members of IS0 or IEC participate in the
development of International Standards through technical committees established by the respective organisation to deal with
particular fields of mutual interest. Other international organisations, governmental and non-governmental, in liaison with IS0
and IEC, also take part in the work.
In the field of information technology, IS0 and IEC have established a joint technical committee ISO/IEC JTC 1. Draft
International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an
International Standard requires approval by at least 75% of the national bodies casting a vote.
International Standard ISO/IEC 2022 was prepared by the European Association for the Standardization of Information and
Communication Systems, ECMA, (as ECMA-35) and was adopted, under a special “fast-track procedure”, by Joint Technical
Committee ISO/IEC JTC 1, Information technology, in parallel with its approval by national bodies of IS0 and IEC.
This fourth edition cancels and replaces the third edition (IS0 2022: 1986), of which it constitutes a technical revision (see also
the introduction).
Annex A forms an integral part of this International Standard. Annexes B, C and D are for information only.

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ISO/IEC 2022:1994 (E)
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Introduction
ECMA/TCl participates very actively in the work of JTCl/SC2 (previously ISO/TC97/SC2) on code structure and code
extension, and contributed numerous technical papers to SC2/WGl, the group entrusted with the preparation of IS0 2022, the
International Standard for code extension techniques. ECMA published its first Standard ECMA-35 on the same subject in
1971. Three further editions in 1980, 1982 and 1985 reflected the progress achieved internationally, and the text of the 1985
edition was identical with that of the 1986 edition of IS0 2022.
The present edition of ISO/IEC 2022 is technically almost identical with the 1986 edition but is completely rearranged and
rewritten to make it more convenient to use as a reference document.
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INTERNATIONAL STANDARD 0 *SonEC ISO/IEC 2022:1994 (E)
Information technology - Character code structure and extension techniques
Section 1 - General
1 Scope
This International Standard specifies the structure of 8-bit codes and 7-bit codes which provide for the coding of character sets.
The code elements used in the structure are common to both the 8-bit and 7-bit codes. The codes use a variety of techniques
for extending the capabilities of elementary 8-bit and 7-bit codes. Greater emphasis is given to 8-bit codes in this edition of the
Standard than in previous editions because they are now more widely used.
The use of common elements in the 8-bit and 7-bit code structure enables any specific conforming 8-bit code to be
transformed into an equivalent 7-bit code, and vice versa, in a simple and direct fashion.
ISO/IEC 4873 conforms to the 8-bit code structure specified here, and ISO/IEC 646 conforms to the 7-bit code structure
specified here.
Note - The coded character set specified in ISO/IEC 10646-l has a different structure not in accordance with this International Standard.
The code structure facilities specified here include various means of extending the number of control functions and graphic
characters available in a code. They also include techniques to construct and formalize the definition of specific codes, and to
provide a coded identification of the structure and of the constituent elements of such specific codes.
Specific codes may also be identified by means of object identifiers in accordance with IS0 8824, Abstract Syntax Notation
One (ASN.l). The form of such object identifiers is specified in annex A.
Individual character sets and control functions intended for use with these 8-bit and 7-bit codes are assumed to be registered in
in accordance with IS0 2375 (see
the IS0 International Register of Coded Character Sets to be Used with Escape Sequences,
annex B). The register includes details to relate individual character sets and control functions with their coded representations,
and also with the associated coded identifications of such character sets.
The principles established in this International Standard may be utilized to form supplementary code structure facilities. For
example ISO/IEC 6429 has followed such a procedure to formulate some parameterized control functions.
The use of uniform code structure techniques for the 8-bit and 7-bit codes specified here has the advantage of:
-
permitting uniform provision for code structure in the design of information processing systems,
-
providing standardized methods of calling into use agreed sets of characters,
-
allowing the interchange of data between environments that utilise 8-bit and 7-bit codes respectively,
-
reducing the risk of conflict between systems required to inter-operate.
When two systems with different levels of implementation of code structure facilities are required to communicate with one
another, they may do so using the code structure facilities that they have in common.
The codes specified here are designed to be used for data that is processed sequentially in a forward direction. Use of these
codes in strings of data which are processed in some other way, or which are included in data formatted for fixed-length record
processing, may have undesirable results or may require additional special treatment to ensure correct interpretation.
Note - Since the previous edition (1986) of this International Standard the text has been completely rearranged and rewritten to make the Standard more
convenient to use as a reference document. It is now arranged in three main sections as follows:
1 General
2 Character Sets and Codes
3 Code Identification and Escape Sequences

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ISO/IEX 2022: 1994 (E) 0 ISO/IEC
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 options 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 from which different selections
may 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 selection of facilities from this International Standard that are to be used in a particular application will generally be
included in a specification document, which states the adopted facilities and gives other details necessary to define fully one or
more specific codes. Such a specification is said to be in accordance with this International Standard (see 10.1).
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 within that CC-data-element satisfy the following conditions:
they shall represent graphic characters, control functions, and code-identification functions in accordance with an identified
a)
selection of the facilities specified in this International Standard (i.e. a version of this Standard, see 10.1);
b) when the code extension techniques specified in this International Standard are used, they shall be implemented by the
control functions and code-identification functions defined in this Standard with the meaning and coded representation
specified in this Standard;
c) no coded representation that is either reserved for registration and not assigned, or reserved for future use, shall be used;
d) no registered escape sequence shall be used with a meaning different from that defined by the registration.
2.3 Conformance of devices
A device is in conformance with this International Standard if it conforms to the requirements of 2.3.1, and either or both of
2.3.2 and 2.3.3 below. Any claim of conformance shall identify the document which contains the description specified in 2.3.1.
2.3.1 Device description
A device that conforms to this International Standard shall be the subject of a description that
identifies either directly, or by reference to a specification that is in accordance with this International Standard, the
a)
selection of facilities from this Standard that it can utilize when originating or when receiving CC-data-elements;
b) identifies the means by which the user may supply the corresponding characters and functions, or may recognize them
when they are made available to the user, as specified in 2.3.2 and 2.3.3 respectively.
2.3.2 Originating devices
An originating device shall be capable of transmitting within a CC-data-element the coded representations of graphic
characters from one or more graphic character sets, and of an identified selection of control functions and code-identification
functions conforming to this International Standard.
Such a device shall allow the user to supply, from an appropriate set, characters or other indications which will implicitly or
explicitly determine the graphic characters, control functions, and code-identification functions whose coded representations
are to be transmitted.
2.3.3 Receiving devices
A receiving device shall be capable of receiving within a CC-data-element and interpreting the coded representations of
graphic characters from one or more graphic character sets, and an identified selection of control functions and code-
identification functions conforming to this International Standard.
Such a device shall make available to the user, from an appropriate set, characters or other indications which are implicitly or
explicitly determined by the graphic characters, control functions, and code-identification functions whose coded
representations are received.
2

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ISOBEC 2022: 1994 (E)
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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 editions indicated were valid. All standards are subject to revision, and parties to
agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent
editions of the standards listed below. Members of IEC and IS0 maintain registers of currently valid standards.
IS0 2375: 1985, Data processing - Procedure for registration of escape sequences.
ISOIIEC 6429: 1992, Information technology - Controlfunctions for coded character sets.
Open Systems Interconnection - Specification of Abstract Syntax Notation One
IS0 8824: 1990, Information technology -
(ASN. I).
Specification of Basic Encoding Rules for Abstract
IS0 8825: 1990, Information technology - Open Systems Interconnection -
Syntax Notation One (ASN.1).
IS0 International Register of Coded Character Sets to be Used with Escape Sequences.
4 Definitions
For the purposes of this International Standard, the following definitions apply.
41 . bit combination: An ordered set of bits used for the representation of characters.
4.2 byte: A bit string that is operated upon as a unit.
Note - Each bit has the value either ZERO or ONE.
4.3 character: A member of a set of elements used for the organization, control or representation of data.
4.4 coded-character-data-element (CC-data-element): 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.
Notes
1 - In a communication environment in accordance with the Reference Model for Open Systems Interconnection of IS0 7498, a CC-data-element will form
all or part of the information that corresponds to the Presentation-Protocol-Data-Unit (PPDU) defined in that International Standard.
a CC -data-element will form all or part of the information
2 - When information interchange is accomplished by means of interchangeable media,
corresponds to the user data, and not that recorded during formatting and initialization.
one-to-one relationship
4.5 coded character set; code: A set of unambiguous rules that establishes a character set and the
between the characters of the set and their bit combinations.
4.6 code extension: The techniques for the encoding of characters that are not included in the character set of a given code.
combination in a code.
47 0 code table: A table showing the character allocated to each bit
4.8 combining character: A member of an identified subset of a coded character set, intended for combination with the
preceding or following graphic character, or with a sequence of combining characters preceded or followed by a non-
combining character.
4.9 control character: A control function the coded representation of which consists of a single bit combination.
transmission or interpretation of data, and that has
4.10 control function: An action that affects the recording, processing,
a coded representation consisting of one or more bit combinations.
represented, in some cases immediately and in others on the
4.11 to designate: To identify a set of characters that are to be
occurrence of a further control function, in a prescribed manner.

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0 ISO/IEC
ISO/IEC 2022: 1994 (E)
4.12 device: A component of information processing equipment which can transmit, and/or can 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 a gateway function.
4.13 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.
Note -In this International Standard ESCAPE is always referred to as a control character.
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 handwritten,
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 Intermediate Byte: A bit combination which may occur between that of the control character ESCAPE and the Final
Byte in an escape sequence.
4.18 to invoke: To cause a designated set of characters to be represented by the prescribed bit combinations whenever those
bit combinations occur.
4.19 repertoire: A specified set of characters that are each represented by one or more bit combinations of a coded
character set.
4.20 to represent:
a) To use a prescribed bit combination with the meaning of a character in a set of characters that has been designated and
invoked; or
b) To use an escape sequence with the meaning of an additional control function.
4.21 user: A person or other entity that invokes the services provided by a device.
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 the user or made available to the user, may be in the form of codes local to the device, or of non-conventional visible
representations, provided that 2.3 above is satisfied.
5 Notation, code tables and names
5.1 Notation
The bits of the bit combinations of the 8-bit code are identified by b b b b b b b and b,, where b, is the highest
8’ 79 69 5’ 43 39 2
order, or most-significant, bit and b, is the lowest-order, or least-significant, bit.
The bits of the bit combinations of the 7-bit code are identified by b,, b,, b,, b,, b,, b, and b,, where b, 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 binary notation, in the range 0 to 255 for the &bit code, and
in the range 0 to 127 for the 7-bit code, by attributing the following weights to the individual bits:
Bit:
bl
bl3 b7 b6 b5 b4 b3 b2
Weight: 128 64 32 16 8 4 2 1
In this International Standard, the bit combinations are identified by notations of the form x/y, where x and y are numbers in
therangeOOt0 15.
The correspondence between the notations of the form x/y and the bit combinations consisting of the bits b8 or b, to b, is as
follows:
- x for the 8-bit code is the number represented by b,, b,, b,, and b, where these bits are given the weights 8, 4, 2 and 1
respectively;
4

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0 ISO/IEC ISO/IEC 2022:1994 (E)
-
x for the 7-bit code is the number represented by b,, b,, and b, where these bits are given the weights 4, 2 and 1
respectively;
-
y is the number represented by b,, b,, b, and b, where these bits are given the weights 8,4,2 and 1 respectively.
The notations of the form x/y are the same as those used to identify code table positions, where x is the column number and y
the row number (see 5.2).
5.2 Code tables
An 8-bit code table consists of 256 positions arranged in 16 columns and 16 rows. The columns and rows are numbered 00 to
15 (see figure 1).
A 7-bit code table consists of 128 positions arranged in 8 columns and 16 rows. The columns are numbered 00 to 07 and the
rows 00 to 15 (see figure 1).
The code table positions are identified by notations of the form x/y, where x is the column number and y is the row number.
By convention, leading zeroes are included in the column and row numbers (e.g. 02/01).
The positions of the code table are in one-to-one correspondence with the bit combinations of the code. The notation of a code
table position, of the form x/y, is the same as that of the corresponding bit combination.
001 OllO2103104 05 06 07 00 01 02 03 04 05 06 07
08 09 10 11 12 13 14 15
I
I 00
01
‘““‘+ttFFttl r-l
06
07
n8
"V
09
10
11
12
13
IA
I 1
15
7-bit
8-bit
Figure 1 - Code tables
5.3 Names of characters
This International Standard assigns one name to each character. In addition, it specifies an acronym for each control character
and for the characters SPACE and DELETE. By convention, only capital letters, space and hyphen are used for writing the
names of the characters. For acronyms only capital letters and digits are used. It is intended that the acronyms and this
convention be retained in all translations of the text.

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ISO/IEC 2022:1994 (E) 0 ISOnEC
Section 2 - Character sets and codes
6 Characters and character sets
6.1 Types of characters and character sets
The structure of &bit and 7-bit codes specified by this International Standard makes use of the following types of characters,
character sets, and functions:
- fixed coded characters,
-
sets of coded graphic characters,
-
sets of coded control functions (or control characters),
-
coded single additional control functions.
These components are specified respectively in 6.2 to 6.5 below.
The coded representations of the graphic characters and control functions are specified in relation to the &bit and 7-bit code
tables defined in 5.2 above. A coded representation for each type of component is specified within columns 00 to 07 of the
&bit and 7-bit code tables. For some components an alternative coded representation is specified in columns 08 to 15 of the
8-bit code table, and is not applicable to any 7-bit code.
6.2 Fixed coded characters
6.2.1 Character DELETE
Name: DELETE Acronym: DEL Coded representation: 07/ 15
DEL was originally used to erase or obliterate an erroneous or unwanted character in punched tape. DEL may be used for
media-fill or time-fill. DEL characters may be inserted into, or removed from, a CC-data-element without affecting its
information content, but such action may affect the information layout and/or the control of equipment.
6.2.2 Character ESCAPE
Name: ESCAPE Acronym: ESC Coded representation: 01/l 1
ESCAPE is a control character used for code extension purposes. It causes the meaning of a limited number of the bit
combinations following it in a CC-data-element to be changed. These bit combinations, together with the preceding bit
combination that represents the ESC character, constitute an escape sequence.
Escape sequences provide the coded representations of code-identification functions and of some types of control functions.
The various uses of escape sequences are specified in clause 13. Code identification functions are specified in clauses 14 and
15.
6.2.3 Character SPACE
Name: SPACE Acronym: SP Coded representation: 02/00
SPACE is a graphic character. It has a visual representation consisting of the absence of a graphic symbol. It causes the active
position to be advanced by one character position.
6.3 Sets of coded graphic characters
6.3.1 Types of coded graphic character set
A graphic character shall have a coded representation comprising one or more 8-bit combinations (bytes) in an 8-bit code, and
one or more 7-bit combinations (bytes) in a 7-bit code. Within a coded graphic character set each character shall be
represented by the same number of such bit combinations.
The bit combinations used to represent the graphic characters in a set shall be either from the six adjacent columns numbered
02 to 07 of the code tables or from the six adjacent columns numbered 10 to 15 of the 8-bit code table.
The type of a coded graphic character set is defined by the maximum number of graphic characters that the set can contain.
The types of set specified here are illustrated in figure 3.
6

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0 ISO/IEC ISO/IEC 2022: 1994 (E)
A coded graphic character set in which each character is represented by a single bit combination shall be one of the following:
-
94-character set, in positions 02/01 to 07/14, or lO/Ol to 15/14;
(i.e. all positions in columns 02 to 07 except 02/00 and 07/15, or
all positions in columns 10 to 15 except lO/OO and 15/15)
-
96-character set, in positions 02/00 to 07/15, or lO/OO to 15115.
(i.e. all positions in columns 02 to 0
...