Telepen
245
with each bar code. The start/stop code structure permits bar code scanning
in a left-to-right direction only.
Data Field
The bar code data produces a single field of 30 bars for a 5-digit field, 50 bars
for a 9-digit data field, or 60 bars for an 11-digit data field. The bars are
grouped in sets of five. Each set of five bars (comprised of two tall bars and
three short bars) represents one of the five digits of the zip code, plus the
four-digit zip code extension. If the Advanced Bar Code is used, an additional
two-digit code is also added to make an 11-digit data field.
Check Digit
The sixth, tenth or twelfth digit represents the automatic check digit character
for the 5, 9 or 11-digit data field, respectively. The check digit is adde d
automatically to verify accurate scanning.
Tele pen
The Telepen structure is shown in Figure 20 and described below.
Figure 20. Telepen Structure
Quiet Zone
Both ends of the bar code structure require blank quiet zones. The qui et
zones must 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. Be sure to provide sufficient space on the form for the quiet
zones.
Start/Stop Codes
The start/stop code is a unique character identifying the leading and traili ng
end of the bar code. The start/stop code is automatically produced wit h each
bar code. The start/stop code structure permits bidirectional bar code
scanning.
DATAFIELD QUIETQUIET START STOP
LOWERGUARD BAND
CODE CODEZONE ZONE
OPTIONALREADABLE DATA FIELD
CHECKDIGIT
OPTIONAL
SR,SC
HEIGHT
POSITION
UPPERGUARD BAND