SCANTEAM 3000/PDF Information/Examples
CODE
16
SELECTION III
(STACKED)
Symbology
PDF417
Note: Welch Allyn PDF Capable readers can autodiscriminate between
15 Symbologies. For maximum data security, disable the codes not used.
One–Pass
Notify–When–Certain
When–To–Decode
If this option is enabled, any partial PDF417 scan will be
cleared from memory upon a TRIGGER OFF. Normally
PDF scans are saved in memory until either a DECODE or
a new PDF417 label is scanned. It is not always possible
for the reader to know when a new label is introduced.
If this option is enabled, the reader sends out a message
(ASCII decimal 23) to notify the host system that a
successful PDF417 decode is certain; no more scanning is
required.
For Example: in a machine–mount system, a host
computer moves a PDF417 label back and forth in front of
the PDF Capable reader until the ASCII decimal 23 is
received. At that point scanning is completed, and the
decoded message will follow.
The PDF Capable reader must temporarily halt scanning
in order to perform PDF417 decoding. A refined algorithm
automatically predicts when enough information has been
scanned to insure a successful decode. If the scanned
data contains many errors, though, decoding cannot
succeed and more scanning is required.
In a machine–mount system with a predetermined scan
cycle, it may be an advantage to use
Trigger–Off
Decoding. When this option is enabled the reader will not
attempt to decode PDF417 until a TRIGGER OFF. During
the predetermined scanning time, the reader is sure to be
collecting data.
Option
Explanation
Note: The PDF options were designed for machine–mount applications; however, they are
available, but not recommended, for the hand held reader.
