Codablock A; Codablock F; Code 11; Code 39 - Intermec CK60 User Manual

Codablock A

Codablock F

Code 11

Code 39

CK60 Series Handheld Computer User's Manual
Enables or disables decoding of Codablock A symbology. Codablock A is a
2D bar code that is an extension of Code 39.
The current version is Codablock F which is basically a stack of Code 128
symbols. A Codablock F symbol consists of between 2 and 44 rows, each
up to a maximum of 62 symbol characters wide. Each row can be read by a
standard code 128 reader and contains additional overhead information
relating to row numbering and symbol size to enable the decoded output
from each row to be re-assembled to reproduce the complete message in the
right sequence.
The advantage of this code is that it can be read by moving beam laser scan-
ners with very little modification. Codablock was adopted by German
blood banks for the identification of blood.
Code 11 satisfies the requirements for a very high density, discrete numeric
bar code. The name Code 11 derives from 11 different data characters that
can be represented, in addition to a start or stop character.
The character set includes the 10 digits and the dash symbol. Each charac-
ter is represented by a stand-alone group of three bars and two intervening
spaces. Although Code 11 is discrete, it is not self-checking. A single print-
ing defect can transpose one character into another valid character. One or
two check digits obtain data security.
The specifications for Code 11 suggest that this code should have a narrow
element width of 7.5 mils. This results in an information density of 15
characters per inch.
Code 39 (C39) is the most widely used symbology among the industrial bar
codes. Most major companies, trade associations, and the federal govern-
ment find this code to fit their needs. The main feature of this symbology is
the ability to encode messages using the full alphanumeric character set,
seven special characters, and ASCII characters.
Programming for this symbology can be for any length that the application
requires. The application program for the CK60 Computer handles sym-
bology at least one character but no more than 32 characters in length.
When programming the computer for Code 39, it is important to set the
symbology limit as close as possible (minimum and maximum bar code
lengths being scanned). Doing so keeps the computer bar code processing
time to a minimum and conserves battery power.
Chapter 6 — Bar Code Symbologies
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