DD ENV 1649:1996

Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
4 Requirements
4.1 Closed or open system
4.2 Pre-existing standards
4.3 Data to be encoded
4.3.1 Type of data
4.3.2 Data string length
4.3.3 Data check characters
4.4 Symbology selection
4.4.1 Number of symbologies to be used
4.4.2 Symbol security
4.4.3 Symbol X dimensions
4.4.4 Wide to narrow ratio
4.4.5 Aspect ratio of symbols
4.4.6 Other factors influencing symbol specification
4.5 Optical parameters
4.5.1 Scanner light source
4.5.2 Symbol production
4.5.3 Matching the symbol and the reader
4.5.4 Quiet zones
4.6 Symbol quality
4.7 Symbol application
4.8 Labels
4.8.1 Transport applications
4.8.2 Non-transport applications
4.9 Positioning of the symbol
4.10 Environmental conditions
4.10.1 Symbol abrasion
4.10.2 Other factors
4.10.3 Scanning methods
4.11 Health and safety considerations
4.12 Global environmental considerations
Annex A (informative) Symbology character sets
A.1 EN 797 "Bar coding - symbology specifications - "EAN/UPC""
A.2 EN 798 "Bar coding - symbology specifications - "Codebar""
A.3 EN 799 "Bar coding - symbology specifications - "Code 128""
A.4 EN 800 "Bar coding - symbology specifications - "Code 39 ""
A.5 EN 801 "Bar coding - symbology specifications - "Interleaved
    2 of 5 ""
Annex B (informative) Symbology features

Specifies operational aspects affecting the reading of bar code symbols which must be considered in the preparation of application standards as well as defining the subjects which must be addressed by application standards if they are to provide practical guidance to the user industries for whose use they are developed.