Microcom 424 Operator's Manual page 118

Bar Codes
8.1.20 UCC/EAN 128, TCI 50
UCC/EAN 128 symbologies are actually code 128 bar codes that have specific data format
guidelines for multiple data subfields. The subfields are identified by application identifiers
that are specified in the "UCC/EAN Application Identifier Standard" available from the
Uniform Code Council, Inc.®.
Data strings can contain one or more substrings appended onto one line. Each substring
can consist of a 2, 3 or 4 digit Application Identifier immediately followed by a data string
meeting the formatting requirements for that specific Application Identifier.
The following table is a list of the supported Application Identifiers and their specific data
format requirements.
Use the legend below when interpreting the data format requirements listed in the table
below:
a alphabetic character
n numeric number
an alphanumeric character
a3 3 alphabetic characters (fixed length)
n3 3 numeric characters (fixed length)
an3 3 alphanumeric characters (fixed length)
a..3 3 alphabetic characters (variable length)
n..3 3 numeric characters (variable length)
an..3 3 alphanumeric characters (variable length)
(*) Indicates only year and month, DD must be filled with "00"
(**) Plus one digit for length indication
(***) Plus one digit for decimal point indication
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Chapter 8