Denso QS20H, Руководство пользователя

Страница: 14 / 41

4
■
Features
Trigger switch control
If you press the trigger switch, the QS20H will become ready to scan. Bringing
the scanning window to a 2D code or bar code will cause QS20H to read the code
and send it to the connected PC or external equipment automatically. The
trigger switch is available in four modes—Auto-off mode, Momentary switching
mode, Alternate switching mode, and Continuous reading mode. You may
switch between those modes from the QR-coded parameter menu given in
Chapter 4.
(1) Auto-off mode
Holding down the trigger switch lights the illumination LED for a maximum of 5
seconds during which the QS20H is ready to scan. If you release the trigger
switch or when the QS20H completes code reading, the illumination LED goes
off.
(2) Momentary switching mode
Only while you hold down the trigger switch, the illumination LED lights and the
QS20H can read a code.
(3) Alternate switching mode
Pressing the trigger switch turns on the illumination LED. Even if the switch is
released, the illumination LED remains on until a code is read successfully or you
press the trigger switch again. Pressing the trigger switch toggles the illumina-
tion LED on and off.
(4) Continuous reading mode
Powering on the QS20H turns on the illumination LED and keeps it on, irrespec-
tive of the trigger switch.
Re-read prevention
The QS20H supports the re-read prevention so that it will not read same codes in
succession. If the QS20H 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
QS20H might read same codes in succession at intervals of more than one
second.