On-Demand Printing; Bar Code Failures; Bad Bar Code Error Detection; Missing Bar Code Error Detection - Printronix SL5000r User Manual

Chapter 2
3. Press
4. Press  until Min. Code Gap displays.
5. Press + or – to scroll through the choices: 0.15 to 1.00 inches in 0.01 inch
6. Press
7. Press  and
8. Press PAUSE again to put the printer online.
NOTE:

On-Demand Printing

In order for each bar code to be successfully validated, the entire bar code must pass
completely under the scanning beam, even when the printer is set up for on-demand
printing. In cases where the bar code is close to the bottom of a label and the printer is in
an on-demand printing mode, the printer automatically pushes the label past the
scanning beam. Once the bar code is validated, the printer retracts the label back to be
cut or torn off.
Because the printer has to push out and then retract labels in
on-demand printing modes, the extra movements slow the printing process. You can
avoid this by adjusting the form so that the bar code appears early enough on the form
so that it will pass completely under the scanning beam during normal printing. This may
involve rotating the form or moving the bar code to a different position on the form.

Bar Code Failures

The validator tells the printer to announce a fault condition in two situations:
 if the validator detects a bad bar code
 if the validator detects no bar code where it expects to find one.
How the printer reacts to these faults is determined by the printer's configuration
settings, as described below.

Bad Bar Code Error Detection

The validator examines every bar code that passes under the scanning beam and
sends an analysis report to the printer. If a bar code is reported to have failed to meet
any of the acceptance criteria, an error condition is reported. How the printer then reacts
is described in "Validator Action (Error Action)" on page 75.

Missing Bar Code Error Detection

A bar code may print so poorly that the validator cannot detect it, and the printer does
not receive an analysis report for the code. To catch this problem, the printer tracks the
position of the last label printed and knows when it should have completely passed the
scanning beam. It can then compare the number of bar code analysis reports it
74
. .
. until VALIDATOR displays.
increments. The default is 0.30 inches.

to select the desired value.

at the same time to lock the
printer offline.
To avoid the risk of miscorrelation, the printer automatically sets its Print
Speed based on the information that has been selected to ensure validation
results are accurate.

key, then press PAUSE to take the