REFERENCES
123
•
For readers using the software trigger parameter (FLASH MODE), a reading
cycle corresponds to the flash on + flash off times. Code reading takes place
during the flash on time.
•
For readers using the hardware trigger parameter, a reading cycle corresponds
to a trigger press (ON) + one of the following OFF events:
trigger release (for
trigger active level
)
a second trigger press (for
trigger active pulse
)
trigger-off timeout
(see par. 4.6.3).
When
one read per cycle
is selected, the device decodes only one code during the
ON period and immediately turns the reader OFF. It is only possible to read another
code when the next ON time occurs.
In
multiple reads per cycle
, the ON period is extended so that the device can
continue decoding codes until an OFF event occurs. For software trigger mode, the
flash on
period is immediately reset after each read and therefore extended. If
another code is decoded before the reset
flash on
period expires, it is again reset
and the effect is that the device remains ON, decoding codes until the
flash on
or
timeout
period expires.
The Safety Time parameter should be used in this case to avoid unwanted multiple
reading of the same code, see par. 4.6.5.
4.6.5
Safety Time
Safety time prevents the device from immediately decoding the same code more
than once. Same code consecutive reading can be disabled requiring the reader to
be removed from the code (no decoding) for at least 400 ms, or a timeout can be set
up to 9.9 seconds before the decoder will accept the same code. Reading is
immediate if the code changes.
For
Automatic
Hand-Held or Stand Operation, the Safety Time parameter is forced to
no code consecutive reading (00).
The safety time parameter is not applicable when reading stacked codes or when
setting one read per cycle in hardware trigger operating mode, since these settings
require voluntary action by the user.
4.6.6
Automatic Operation Aiming Light
This parameter is valid for CCD long range devices in
Automatic
Hand-Held or Stand
Operation and allows an aiming light to be continuously emitted in front of the reader
to facilitate the positioning of the barcode to be read.
Summary of Contents for Hand-Held Devices II
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