Identicon - Printronix L7032 Programmer's Reference Manual

Chapter 3
Bar Codes

Identicon

The Identicon bar code structure is shown in Figure 13 and described on
following pages.
QUIET START
ZONE
Quiet Zone
Quiet zones extend on both ends of the bar code to permit the scan to begin
and end in a blank area. The quiet zone should be at least 0.25 inch wide and
completely blank.
Start/Stop Codes
The Start/Stop codes identify the leading and trailing end of the bar code. The
Start/Stop code is automatically produced with each bar code.
Data Field
The bar code symbol uses a series of wide and narrow bars to represent the
10 numeric characters (0 - 9) and Start/Stop codes. All the information is
contained in the width of the bars, the spaces serving only to separate the
individual bars. The wide bars are conventionally three times the widths of the
narrow bars. The spaces may be any reasonable width but are typically equal
to the narrow bars. The bar code can encode up to 40 numbers. Each data
character is represented by 5 bars separated by spaces. There must be two
wide bars among the 5 bars. See Table 47 for symbol coding.
228
STARTING
POSITION
STOP
DATA FIELD
CODE CODE
LOWER GUARD BAND
OPTIONAL READABLE DATA FIELD
Figure 13. Identicon Structure
HEIGHT
QUIET
ZONE
STARTING
POSITION
START
CODE
OPTIONAL
READABLE
DATA DATA
FIELD
FIELD
STOP
LOWER
CODE
GUARD
BAND
QUIET
ZONE
QUIET
ZONE
HEIGHT