ISO 646:1983

International Standard 646
1NTERNATLONAL ORGANIZATION FOR STANDARDIZATlON.MErrmYHAPOAHAR OPiAHH3AUHR Il0 CTAHPAPTH3AUHH.ORGANlSATlON INTERNATIONALE DE NORMALISATION
,I Information processing - IS0 7-bit coded character set
for information interchange
Traitement de l'information - Jeu IS0 de caractères codés à 7 éléments pour l'échange d'information
Second edition - 1983-07-01
UDC 681.3.042 : 003.62 Ref. No. ISO646-1983(E)
Descriptors : data processing, information interchange, character sets, coded character sets, IS0 seven-bit codes, control characters, graphic
characters, coded representation.
Price based on 15 pages .L' /

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Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of developing International
Standards is carried out through IS0 technical committees. Every member body
a subject for which a technical committee has been authorized has the
interested in
right to be represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council.
International Standard IS0 646 was developed by Technical Committee ISO/TC 97,
Information processing systems, and was circulated to the member bodies in
March 1982.
It has been approved by the member bodies of the following countries :
Belgium
Germany, F. R. Romania
Canada Hungary South Africa, Rep. of
China
Ireland Spain
Czechoslovakia Italy Sweden
Denmark Japan Switzerland
Egypt, Arab Rep. of Netherlands United Kingdom
Finland Norway USA
France
Poland
No member body expressed disapproval of the document.
This second edition cancels and replaces the first edition (i.e. IS0 ô4ô-1973).
O International Organization for Standardization, 1983 0
Printed in Switzerland
II

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Contents
Page
1 Scope and field of application . 1
2 Conformance and implementation . 1
3 Definitions . 1
4 Specification of the coded character set . 2
5 Composite graphic characters . 6
6 Versions of the coded character set . 6
7 Codetables . 7
8 Description of the control characters . 10
Bibliography . 12
Annexes
A Guidelines for standards derived from IS0 646 . 14
B
Main differences between IS0 646-1973 and the present edition . 15
...
111

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INTERNATIONAL STANDARD IS0 646-1983 (E)
Information processing - IS0 7-bit coded character set
for information interchange
1 Scope and field of application able to interchange information by means of a version of the 1
7-bit coded character set, this version shall be identified in any
i
1.1 This International Standard specifies a set of 128 char-
such claim.
acters (control characters and graphic characters such as let-
ters, digits and symbols) with their coded representation. Most
,
2.2 Implementation
of these characters are mandatory and unchangeable, but pro-
vision is made for some flexibility to accommodate national and
The use of this character set requires definitions of its imple-
other requirements.
mentation in various media. For example, these could include
punched tapes, punched cards, magnetic media and transmis-
1.2 This International Standard specifies a 7-bit coded char-
sion channels, thus permitting interchange of data to take place
acter set with a number of options. It also provides guidance on
either indirectly by means of an intermediate recording in a
how to exercise the options to define specific national versions
physical medium, or by local connection of various units (such
and application-orientated versions. Furthermore it specifies
as input and output devices and computers) or by means of
the International Reference Version (IRV) in which such op-
data transmission equipment.
tions have been exercised.
*
The implementation of this coded character set in physical
7
media and for transmission, taking into account the need for er-
1.3 This character set is primarily intended for the inter- ,
ror checking, is the subject of other International Standards
change of informationkmong data processing systems and
(see the bibliography).
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-
mining this character set. -
3 Definitions
1.4 This character set is applicable to all alphabets of Latin?
For the purpose of this International Standard the following
letters. definitions apply.
I
3.1 bit combination : An ordered Set Of bits used for the
1.5 This character set includes control characters for code
extension where its 128 characters are insufficient for particular 3 representation of Characters.
applications. Procedures for the use of these control characters
are specified in IS0 2022.l21
3.2 character : A member of a set of elements used for the
organization, control or representation of data.
1.6 The definitions of some control characters in this Interna-
tional Standard assume that data associated with them are to
coded character set; code : A set of unambiguous
3.3
be processed in a forward direction. When they are in-
that establishes a character set and the one-to-one rela.
cluded in strings of data which are processed other than serially
tionship between the characters of the set and their bit
in a forward direction or when they are included in data for-
binations.
matted for fixed-record processing they may have undesirable
effects or may require additional special treatment to ensure
that they result in their desired function. 3.4 code extension : The techniques for the encoding of
characters that are not included in the character set of a given
code.
2 Conformance and implementation
3.5 code table : A table showing the character allocated to
2.1 Conformance
each bit combination in a code.
A coded character set is in conformance with this International /
Standard if it is a version in accordance with clause 6. Equip- 3.6 control character : A control function the coded
ment claimed to implement this International Standard shall be ! representation of which consists of a single bit combination.
1

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IS0 646-1983 (E)
3.7 control function : An action that affects the recording, This International Standard assigns at least one name to each
processing, transmission or interpretation of data and that has
character. In addition, it specifies an acronym for each control
a coded representation consisting of one or more bit combina- character and for the character SPACE, and a graphic symbol
tions. for each graphic character. By convention, only capital letters
and hyphens are used for writing the names of the characters,
except for small letters. For acronyms only capital letters and
3.8 graphic character : A character, other than a control
digits are used. It is intended that the acronyms and this con-
function, that has a visual representation normally handwritten,
vention be retained in all translations of the text.
printed or displayed.
The names chosen to denote graphic characters are intended to
position : That part of a code table identified by its reflect their customary meaning. However, this International
3.9
Standard does not define and does not restrict the meanings of
column and row co-ordinates.
graphic characters. Neither does it specify a particular style or
font design for the graphic characters when imaged.
4 Specification of the coded character set
4.1 Control characters
The bits of the bit combinations of the 7-bit code are identified
The control characters of the 7-bit coded character set are
by b,, b,, b,, b,, b,, b2 and b,, where b, is the highest-order, or
:
most-significant/ bit and b, is the lowest-order, or least- classified in the following categories
significant, bit.
a) Transmission control characters
The bit combinations may be interpreted to represent integers
Transmission control characters are intended to control or
in the range O to 127 in binary notation by attributing the follow- facilitate transmission of information over telecommunica-
ing weights to the individual bits :
tion networks. Procedures for the use of the transmission
control characters on telecommunication networks are the
subject of other International Standards (see the biblio- I
Bit : b7 b6 b5 b4 b3
b2 bl
graphy).
Weight : 6432168421
b) Format effectors
In this International Standard, the bit combinations are iden-
Format effectors are mainly intended for the control of the
tified by notation of the form xly, where x is a number in the
layout and positioning of information on character-imaging
range O to 7 and y is a number in the range O to 15. The cor-
devices such as printing and display devices.
respondence between the notations of the form x/y and the bit
combinations consisting of the bits b, to b, is as follows :
c) Code extension control characty5M be
Code extension control characters used to extend the
-
x is the number represented by b,, b, and b, where
character set of the code. They may alter the meaning of
these bits are given the weights 4, 2 and 1 respectively;
one or more bit combinations that follow them in the data
stream. Procedures for the use of the code extension con-
- y is the number represented by b,, b,, b2 and b, where
IS0 2022.[21
trol characters are specified in
these bits are given the weights 8, 4, 2 and 1 respectively.
di Device control characters
The notations of the form x/y are the same as those used to
identify code table positions, where x is the column number Device control characters are intended for the control of
and y the row number (see clause 7).
local or remote devices or ancillary devices connected to a
data processing or data communication system. These con-
The 128 bit combinations of the 7-bit code represent control
trol characters are not intended to control data communica-
characters and graphic characters. The allocation of characters
tion systems; this should be achieved by the use of
to bit combinations is based on the following principles :
transmission control characters.
-
the bit combinations 0/0 to 1/15 represent 32 control
e) Information separators
characters;
Information separators are used to separate and qualify data
logically. There are four such characters. They may be used
- the bit combination 2/0 represents the character
either in hierarchical order or non-hierarchically; in the latter
SPACE, which is interpreted both as a control character and
case, their specific meanings depend on the application.
as a graphic character;
f) Other control characters
- the bit combinations 2/1 to 7/14 represent up to
These are the control characters that fall outside the
bit combina-
94 graphic characters as one or more of these
preceding categories.
tions may be declared to be unused (see 4.3);
The composition of each category, and the allocation of the in-
- the bit combination 7/15 represents the control
dividual control characters in each category to bi! combinations
character DELETE.
of the 7-bit code are specified in 4.1.1 to 4.1.6. Each of these
sub-clauses contains a table consisting of three columns. The
The allocation of individual characters to the bit combinations
first column specifies the acronym of each control character,
of the 7-bit code is specified in 4.1, 4.2 and 4.3 below.
2

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IS0 646-1983 (E)
Each character position is capable of imaging SPACE or
the second column specifies the standard name of the control b)
character and the third column, labelled “Coded representa- a graphic symbol.
tion‘’, specifies the bit combination representing the control
character concerned.
c) The graphic symbol imaged at a character position
represents a graphic character, a control function, or a com-
Detailed functional descriptions of all control characters are
bination of one or more graphic characters andior control
given in clause 8.
functions.
4.1.1 Transmission control characters
d) The active position is the character position at which
The transmission control characters and their coded represen-
the action required by the next character in the data stream
tations are specified in table 1
is to be effected. If the next character is a graphic character,
it is imaged at that position; if it is a control character, the
corresponding function is performed relative to that posi-
Table 1 - Transmission control characters -
tion.
Coded representation
Coded
icronym Name
e) Movements of the active position are effected as
representation
~ ~
follows :
START OF HEADING O1 1
SOH
1) The active position is advanced one character posi-
START OF TEXT O12
ST X
tion immediately after imaging a SPACE or a graphic
character, and upon the execution of the function cor-
END OF TEXT 013
ETX
responding to a control character for which a graphic
END OF TRANSMISSION 014
EOT
symbol is required to be imaged.
ENQ ENQUIRY 015
2) The active position is moved to a specified character
ACK ACKNOWLEDGE O16
position upon the execution of the function corresponding
to a control character that is defined to cause a move-
DATA LINK ESCAPE
DLE 1 IO
ment of the active position (i.e. a format effector).
NAK NEGATIVE ACKNOWLEDGE
115
SYNCHRONOUS IDLE 1 /6 f) The active position is not moved upon execution of the
SYN
function corresponding to a control character that is neither
ETB END OF TRANSMISSION BLOCK 1 17
required to be imaged by a graphic symbol nor defined to
cause a movement of the active position.
4.1.2 Format effectors
g) The effect of an attempt to move the active position
beyond the boundaries of a line or a page is not defined by
The format effectors and their coded representations are
this International Standard.
specified in table 2.
Table 2 - Format effectors - Coded representation 4.1.2.2 Combined horizontal and vertical movements of the
active position
Coded
rcronym Name
pepresentation
The format effectors are defined for applications in which
horizontal and vertical movements of the active position are ef-
BS BACKSPACE O18
fected separately. If a single control character is required to ef-
fect the action of CARRIAGE RETURN in combination with a
HT HORIZONTAL TABULATION O19
vertical movement, the format effector for that vertical move-
LF LINE FEED 0110
ment shall be used. For example, if the function “new line”
(equivalent to the combination of CARRIAGE RETURN and
VT VERTICAL TABULATION 0111
LINE FEED) is required as a single control character, bit com-
bination 0/10 shall be used to represent it. This substitution re-
FF FORM FEED 0112
quires agreement between the sender and the recipient of the
CR CARRIAGE RETURN 0113
data, and the format effectors (LINE FEED, VERTICAL
TABULATION and/or FORM FEED) that are affected shall be
identified (see clause 6).
4.1.2.1 Concepts
In order to avoid the need for such prior agreement, to facilitate
The definitions of the format effectors use the following con- interchange and to avoid conflicts with specifications in other
cepts : International Standards, the use of format effectors for vertical
movements is deprecated. It is strongly recommended to use
A page is composed of a number of lines, each being two control characters, for example CARRIAGE RETURN (CR)
a)
composed of a number of character positions. and LINE FEED (LF) to obtain the effect of “new line”.
3

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IS0 646-1983 (E)
specific names and are intended mainly for applications where
4.1.3 Code extension control characters
the information separatorsare used hierarchically. The ascending
order is then US, RS, GS, FS. In this case, data normally
The code extension control characters and their coded
delimited by a particular separator cannot be split by a higher-
representations are specified in table 3.
order separator but will be considered as delimited by any
higher-order separator.
Table 3 - Code extension control characters - Coded
representation
4.1.6 Other control characters
IAcronym 1 Name
1 reprz::!ttion I
The control characters outside the categories in 4.1.1 to 4.1.5
and their coded representation, are specified in table 6.
SHIFT-OUT 0114
s 0
Table 6 - Other control characters - Coded
SHIFT-IN O115
s 1
representation
1/11
ESC ESCAPE
Coded
hcronym Name
representation
4.1.4 Device control characters
NUL NULL 010
BEL BELL 017
The device control characters and their coded representations
are specified in table 4.
CAN CANCEL 1 /a
EM
Table 4 - Device control characters - Coded END OF MEDIUM 119
representation
SUB SUBSTITUTE CHARACTER 1/10
DEL DELETE 7/15
Acronym I
Name
DEVICE CONTROL ONE 111
DC 1
4.2 Character SPACE
D c 2 DEVICE CONTROL TWO 112
The acronym of the character SPACE is SP and its coded
DC 3 DEVICE CONTROL THREE 1 13
representation is 210.
D c 4 DEVICE CONTROL FOUR 114
This character is interpreted both as a graphic character and as
a control character.
As a graphic character, it has a visual representation consisting
4.1.5 Information separators
of the absence of a graphic symbol.
The information separators and their coded representations are
As a control character, it acts as a format effector that causes
specified in table 5.
the active position to be advanced one character position.
Table 5 - Information separators - Coded
4.3 Graphic characters
representation
The 94 bit combinations 211 to 7/14 are used for the represen-
Acronym Name
tation of graphic characters as specified in 4.3.1, 4.3.2 and
4.3.3 below. Each of the sub-clauses 4.3.1 and 4.3.2 contains a
INFORMATION SEPARATOR FOUR
1/12
I (Fs)
table consisting of three columns. The first column is labelled
(FILE SEPARATOR)
"Graphic" and specifies the graphic symbol of each graphic
INFORMATION SEPARATOR THREE
character, the second column specifies the standard name of
1/13
Is (Gs)
(GROUP SEPARATOR)
the graphic character and the third column, labelled "Coded
representation", specifies the bit combination representing the
INFORMATION SEPARATOR TWO
1/14
I s2
(RECORD SEPARATOR) graphic character concerned.
INFORMATION SEPARATOR ONE
1/15 All graphic characters of any version of the 7-bit coded
I (Us)
(UNIT SEPARATOR)
I
character set are spacing characters, i.e. they cause the active
position to advance.
Each information separator is given two names. The names IN-
4.3.1 Unique graphic character allocations
FORMATION SEPARATOR FOUR, INFORMATION
SEPARATOR THREE, INFORMATION SEPARATOR TWO
A unique graphic character is allocated to each of the 82 bit
and INFORMATION SEPARATOR ONE are the general names.
combinations 211, 212. 2/5 to 3/15, 411 to 5/10, 5/15 and 611
The names FILE SEPARATOR, GROUP SEPARATOR,
to 7/10. These characters are specified in table 7.
RECORD SEPARATOR and UNIT SEPARATOR are the
4

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IS0 646-1983 (E)
Table 7 - Unique graphic character allocations
Coded
Coded
jraphic Name Sraphic Name
representation representation
I
EXCLAMATION MARK 21 1 M CAPITAL LETTER M 4/13
II
XJOTATION MARK 212 CAPITAL LETTER N 4/14
N
% PERCENT SIGN 215 O CAPITAL LETTER O 4/15
AMPERSAND 216 P CAPITAL LETTER P 510
&
1
APOSTROPHE 217 CAPITAL LETTER Q 5/ 1
Q
( LEFT PARENTHESIS 218 R CAPITAL LETTER R 512
219 CAPITAL LETTER S 513
1 RIGHT PARENTHESIS S
* ASTERISK 2/10 T CAPITAL LETTER T 514
t PLUS SIGN 2/11 CAPITAL LETTER U 515
U
COMMA 2/12 v CAPITAL LETTER V 5/6
t
-
HYPHEN, MINUS SIGN 2/13 W CAPITAL LETTER W 517
FULL STOP 2/14 X CAPITAL LETTER X 518
2/15 CAPITAL LETTER Y 519
/ SOLIDUS Y
310 CAPITAL LETTER Z 5/10
O DIGIT ZERO Z
1 DIGIT ONE 31 1 LOW LINE, UNDERLINE 5/15
-
2 DIGIT TWO 312 a SMALL LETTER a 611
b
3 DIGIT THREE 313 SMALL LETTER b 612
4 DIGIT FOUR 314 C SMALL LETTER c 613
5 DIGIT FIVE 315 d SMALL LETTER d 614
e 615
DIGIT SIX 316 SMALL LETTER e
6
7 DIGIT SEVEN 317 f SMALL LETTER f 616
DIGIT EIGHT 318 SMALL LETTER g 617
8
g
9 DIGIT NINE 319 h SMALL LETTER h 618
COLON 3/10 i SMALL LETTER i 619
SEMICOLON 3/11 SMALL LETTER j 6/10
j
I
6/11
< LESS-THAN SIGN 3/12 k SMALL LETTER k
- -
6/12
EQUALS SIGN 3/13 1 SMALL LETTER I
> GREATER-THAN SIGN 3/14 m SMALL LETTER m 6/13
3
QUESTION MARK 3/15 n SMALL LETTER n 6/14
A CAPITAL LETTER A 41 1 SMALL LETTER O 6/15
O
B CAPITAL LETTER B 412 SMALL LETTER p 710
P
711
C CAPITAL LETTER C 413 SMALL LETTER q
9
CAPITAL LETTER D r 712
D 414 SMALL LETTER r
E 415 S SMALL LETTER s 713
CAPITAL LETTER E
F CAPITAL LETTER F 416 t SMALL LETTER t 714
G CAPITAL LETTER G 417 U SMALL LETTER U 715
H CAPITAL LETTER H 418 v SMALL LETTER v 716
I CAPITAL LETTER I W 717
419 SMALL LETTER w
J CAPITAL LETTER J 4/10 X SMALL LETTER x 718
K CAPITAL LETTER K 411 1 SMALL LETTER y 719
Y
L CAPITAL LETTER L 4/12 z SMALL LETTER z 7/10
5

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IS0 646-1983 (E)
4.3.2 Alternative graphic character allocations 6 Versions of the coded character set
Two alternative graphic characters are allocated to each of the
6.1 General
bit combinations 213 and 2/4. These characters are specified in
table 8.
In order to use the 7-bit coded character set for information
interchange, it is necessary to exercise the options left open in
Table 8 - Alternative graphic character allocations
clause 4 :
- to each of the bit combinations 213 and 214 one of the
Graphic I Name
alternative graphic characters specified in 4.3.2 shall be
~~
allocated;
f POUNDSIGN
- each of the bit combinations 410, 5/11 to 5/14, 610,
NUMBER SIGN
#
and 7/11 to 7/14 shall have a unique graphic character
DOLLAR SIGN
$ it, or be declared unused;
allocated to
l2 CURRENCY SIGN
- the format effectors, if any, to which the facility
of 4.1.2.2 applies, shall be identified.
Either the character POUND SIGN or the character NUMBER
A graphic character allocated to a bit combination specified
SIGN shall be allocated to bit combination 213 and either the
in 4.3.1 and 4.3.2 shall not be allocated to any other bit com-
character DOLLAR SIGN or the character CURRENCY SIGN
bination. For example the POUND SIGN, if not allocated to bit
shall be allocated to bit combination 214 (see clause 6).
combination 213, shall not be allocated to any other bit com-
bination.
Unless otherwise agreed between sender and recipient, the
graphic symbols E, $ and do not designate the currency of a
A character set completed in this way is called a "version of
specific country.
IS0 646" (see annex A).
4.3.3 National or application-orientated graphic
6.2 National versions
character allocations
6.2.1 The responsibility for defining national versions lies with
No specific graphic character is allocated to the ten bit com-
the national standardization bodies. These bodies shall exercise
binations 410, 5/11 to 5/14, 610, and 7/11 to 7/14. These bit
the options available and make the required selection (see an-
combinations are available for national or application-
nex Ai.
orientated use. A unique graphic character shall be allocated to
each of these bit combinations, or the bit combination shall be
6).
declared unused (see clause
6.2.2 If so required, more than one national version can be
defined within a country. The different versions shall be
separately identified. In particular when for a given bit com-
bination, for example 5/12, alternative graphic characters are
5 Composite graphic characters
required, two different versions shall be identified, even if they
differ only by this single character.
In any version of the 7-bit coded character set specified accord-
ing to this International Standard, all graphic characters are
spacing characters which cause the active position to move for-
6.2.3 If there is in a country no special demand for specific
ward. However, by using BACKSPACE or CARRIAGE graphic characters, it is strongly recommended that the
RETURN, it is possible to image two or more graphic
characters of the International Reference Version (IRV)
characters at the same character position. (see 6.4) be selected and allocated to the same bit combina-
tions as in the IRV.
For example, SOLIDUS and EQUALS SIGN can be combined
to image "not equals". The character LOW LINE, that may be However, when graphic characters that are different from the
used as a free-standing character, can also be associated with
characters of the IRV are required, they shall have distinct
other character(s1 to represent the graphic rendition "under-
forms and be given distinctive names which are not in conflict
lined''.
with any of the forms or the names of any of the graphic
characters in the IRV.
Diacritical marks may be allocated to the bit combinations
specified in 4.3.3 and be available for composing accented
letters. For such composition, it is recommended to use a se- 6.3 Application-orientated versions
quence of three characters, the first or last of which is the letter
to be accented and the second of which is BACKSPACE. Fur- Within national or international industries, organizations or pro-
thermore, QUOTATION MARK, APOSTROPHE or COMMA fessional groups, application-orientated versions can be used.
can be associated with a letter by means of BACKSPACE for They require precise agreement among the interested parties,
the composition of an accented letter with a diaeresis, an acute who will have to exercise the options available and to make the
accent or a cedilla, respectively. required selection.

---------------------- Page: 9 ----------------------
IS0 646-1983 (E)
freedom, their processing and imaging may cause difficulties at
6.4 International Reference Version (IRV)
the receiving end. Therefore agreement between sender and
recipient of the data is recommended if composite characters
This version is available for use when there is no requirement to
are used.
use a national or an application-orientated version. In informa-
tion interchange, the IRV is assumed unless a particular agree-
ment exists between sender and recipient of the data. The
graphic characters allocated to the IRV are specified in table 9. 7 Code tables
Table 9 - IRV graphic character allocations
A 7-bit code table consists of 128 positions arranged in
8 columns and 16 rows. The columns are numbered O to 7, and
Coded
the rows are numbered O to 15.
Graphic Name
representation
The code table positions are identified by notations of the form
NUMBER SIGN 213
xly, where x is the column number and y is the row number.
CURRENCY SIGN 214
The 128 positions of the code table are in one-to-one cor-
COMMERCIAL AT 410
respondence with the bit combinations of the 7-bit code. The
LEFT SQUARE BRACKET 5/11 notation of a code table position, of the form xly, is the same
as that of the corresponding bit combination (see clause 4).
REVERSE SOLIDUS 5/12
RIGHT SQUARE BRACKET 5/13
Each code table position contains a symbol and/or a reference
to a clause of this International Standard. When a code table
CIRCUMFLEX ACCENT 5/14
position corresponds to a bit combination that represents a
SPACE, the symbol is the
610 control character or the character
GRAVE ACCENT
acronym of the character allocated; otherwise it is the graphic
7/11
LEFT CURLY BRACKET
symbol representing the character allocated, if any. A reference
to 4.1.2.2, 4.3.2 or 4.3.3 is denoted by @, @ or @
7/12
VERTICAL LINE
respectively.
RIGHT CURLY BRACKET 7/13
Table 10 is the basic 7-bit code table. It shows the 7-bit coded
TILDE, OVERLINE 7/14
character set specified in clause 4 and indicates the options
related to format effectors (4.1.2.2), alternative graphic
characters (4.3.2) and national or application-orientated use
It should be noted that no substitution is allowed when using
(4.3.3).
the IRV and that the facility of sub-clause 4.1.2.2 does not ap-
ply to any format effector.
Table 11 is the code table for the IRV of the 7-bit coded
character set. It shows the result of exercising the three iden-
According to clause 5 it is permitted to use composite graphic
tified options in the manner specified in 6.4.
characters and there is no limit to their number. Because of this
7

---------------------- Page: 10 ----------------------
IS0 646-1983 (E)
Table 10 - Basic 7-bit code table
-
O 1 1
-
O O1
-
1 1c
-
I
9 I I
1 56
bl
3: 12 31
I I I I m
O O O O
DLE
Po
I I I I -
1 DC 1
O O O Qa
-
I I I I
O O 7 O
DC 2
Rb
I I I -
I
O O 1 1 DC 3 sc
I -
I I I
DC4
O 1 O O
Jd
I I -
I I
NAK
O 1 O 1 Ue
I I -
I I
1 1 SYh Vf
O O
-
I I I I
ETE
1 1
O 1
wg
I I -
I I
O Xh
1 O O CAN
I I I -
I
Yi
1 O O 1 EM
I I I I -
1 1 O SUB
O
Zj
I I I I -
1 O 1 1 ESC Ok
-
I I I I
IS4
ot
1 1 O O
I -
I I I
IS3
O 1 Om
1 1
I I I I -
1 1 1 IS2 On
O
-
I I I I
O
1 IS1
1 1 1
I
h I I I
m
@ see 4.1.2.2.
@ See 4.3.2.
@ See 4.3.3 and 6.2.3.
8

-----------------
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