5525B/31/32 Line Matrix Printer Code V Programmer's Reference Manual

MSI
179
MSI
The MSI structure is shown in Figure 16 and described on the following
pages.
Figure 16. MSI Bar Code Structure
Quiet Zone
Both ends of the bar code structure require blank quiet zones. The quiet
zones should be at least 0.25 inches wide and completely blank to ensure
accurate reading of the start/stop codes and to prevent adjacent bar codes
from overlapping. You are responsible for providing sufficient space on the
form for the quiet zones.
Start/Stop Codes
The start/stop code is a unique character identifying the leading and trailing
end of the bar code. The start/stop code is automatically produced with each
bar code, and permits bidirectional bar code scanning.
Data Field
The MSI bar code symbol uses a series of wide and narrow bars and spaces
to represent numeric characters. The structure is 1-module-wide narrow
elements and 2-module-wide wide elements; elements can be a bar or a
space. Each character is composed of 4 data bits, with each bit made up of a
bar and a space totalling 3 modules.
DATA FIELD
QUIETQUIET START STOP
LOWER GUARD BAND
CODE CODEZONE ZONE
OPTIONAL READABLE DATA FIELD
HEIGHT
STARTING
POSITION
CHECK DIGIT
FIELD
DATA
FIELD
QUIET
ZONE
QUIET
ZONE
STOP
CODE
START
CODE
OPTIONAL
READABLE
DATA
FIELD
HEIGHT
STARTING
GUARD
BAND
LOWER
CHECK
OPTIONAL
DIGIT
POSITION