ISO IEC 15417 pdf download – Information technology — Automatic identification and data capture techniques — Bar code symbology specification — Code 128

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ISO IEC 15417 pdf download – Information technology — Automatic identification and data capture techniques — Bar code symbology specification — Code 128

ISO IEC 15417 pdf download – Information technology — Automatic identification and data capture techniques — Bar code symbology specification — Code 128
1Scope
This International Standard defines the technical requirements for the bar code symbology known as Code 128. Itspecifies Code 128 symbology characteristics, data character encodation,dimensions, decoding algorithms andthe application parameters which need to be defined by users. lt specifies the Symbology ldentifier prefix stringsfor Code 128 symbols.
2Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions ofthis International Standard. For dated references,subsequent amendments to,or revisions of, any of thesepublications do not apply. However, parties to agreements based on this International Standard are encouraged toinvestigate the possibility of applying the most recent editions of the normative documents indicated below.Forundated references, the latest edition of the normative document referred to applies. Members of lS0 and lECmaintain registers of currently valid lnternational Standards.
ISO/IEC 646, Information technology —ISO 7-bit coded character set for information interchange.
ISO/EC 8859-1,Information technology — 8-bit single-byte coded graphic character sets — Part 1: Latin alphabetNo.1.
ISO/IEC 10646-1,Information technology — Universal Multiple-Octet Coded Character Set (ucS)— Part 1:Architecture and Basic Multilingual Plane.
ISO/IEC 15424,Information technology — Automatic identification and data capture techniques — Datacarrier/symbology ldentifiers.
ISO/EC 15416, Information technology — Automatic identification and data capture techniques —Bar code printquality test specification —Linear symbols.
EN 1556,Bar coding — Terminology.
3Terms and definitions
For the purposes of this International Standard, the terms and definitions given in EN 1556 apply.
4Requirements
4.1Symbology characteristicsThe characteristics of Code 128 are:a)Encodable character set:
1 ) All 1 28 ASCII characters, i.e. ASCII characters 0 to 1 27 inclusive, in accordance with ISO 646.
2) Characters with ASCII values 1 28 to 255 may also be encoded.
3) 4 non-data function characters.
4) 4 code set selection characters.
5) 3 Start characters.
6) 1 Stop character.
b) Code type: Continuous.
c) Elements per symbol character: 6, comprising 3 bars and 3 spaces, each of 1 , 2, 3 or 4 modules in width
(Stop character: 7 elements comprising 4 bars and 3 spaces).
d) Character self-checking: Yes.
e) Symbol length: Variable.
f) Bidirectionally decodable: Yes.
g) Symbol check character: One, mandatory (see annex A.1 ).
h) Data character density: 1 1 modules per symbol character (5.5 modules per numeric character).
i) Non-data overhead: Equivalent to 35 modules.
4.2 Symbol structure
Code 1 28 symbols shall comprise:
a) leading quiet zone
b) a Start character
c) one or more characters representing data and special characters
d) symbol check character
e) a Stop character
f) trailing quiet zone.
Figure 1 illustrates a Code 1 28 symbol encoding the text “AIM”.