Denso QS20P-A User Manual page 19

(4) Continuous reading mode
Once you press the trigger switch, the QS20P-A turns the illumination LED on
and becomes ready to scan. That ready status will be kept for the specified time.
If no scanning operation is carried out within the specified time, the QS20P-A will
automatically turn itself off.
Re-read prevention
The QS20P-A supports the re-read prevention so that it will not read same codes
in succession. If the QS20P-A fails to read, therefore, you need to release the
trigger switch or pull the scanning window away from the target code for at least
one second for canceling the re-read prevention and then try scanning again.
For low-quality labels which cannot be read for more than one second, the
QS20P-A might read same codes in succession at intervals of more than one
second.
Reading black-and-white inverted QR codes
The QS20P-A can read white QR codes on black background. You may switch
between "Black code on white background" and "White code on black back-
ground" by using the QR-coded parameter menu given in Chapter 7.
Reading split QR codes (registered as "Structured Append" at AIM)
A QR code (except MicroQR) can be split into a maximum of 16 blocks. The
QS20P-A can read split QR codes. Two reading modes of split QR codes are
available—Edit mode and Non-edit mode. In the Edit mode, the QS20P-A edits
scanned split codes and transfers the restored data to the PC; in the Non-edit
mode, each time the QS20P-A reads a single split code, it transfers the data to
the PC. You may switch between those modes by using the QR-coded parameter
menu given in Chapter 7.
When reading split QR codes, the QS20P-A beeps in a different way from usual.
That is, when the QS20P-A reads the first split code, it beeps twice and enters the
split code scanning mode. After that, each time it reads the subsequent split
code, it beeps once. If the QS20P-A reads the last split code, it beeps three times
and completes the sequence of split code scanning.
If you scan any non-split code midway in a sequence of split code scanning,
NOTE
the QS20P-A cancels the split code scanning mode and sends those split
codes scanned to the PC.
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