Software Configuration
146
Matrix 300N
Extending DOF with Automatic Image Settings Selection
Sequence (Input Select) for Liquid Lens Models
For Liquid Lens models, multiple Image Acquisition Settings can be configured
and enabled externally through a distance sensor to extend the reader's depth of
field. The specific Image Acquisition Setting Sequence is selected prior to the
reading phase so that only the correct setting (or group of settings) will be
applied to the entire reading phase.
When only two Image Acquisition Settings are used to extend DOF (one in each
sequ
ence), this effectively allows switching DOF while keeping the lens
refocusing delay outside the reading phase.
This feature is recommended for high speed a
pplications.
NOTE
Example:
Read a 15 mil Data Matrix ECC 200 code covering a range from 140 to 320 mm
at an application speed of 1 m/s. The reading distance range is too long to be
covered by a single acquisition setting, so two acquisition settings could be used
in which the first has a
Reading Distance of 195 mm
and is assigned to Image
Settings #1, and the second has a
Reading Distance of 300 mm
and is assigned
to Image Settings #2.
By assigning the I
mage Settings Selection to External, a proximity sensor (i.e.
S3Z) mounted at least 150 ms before the Acquisition Trigger and connected to
an input (i.e. Input 2), the correct DOF can be selected by enabling the correct
sequence.
As an example, for a conveyor speed of 1 meter/second the Acti
vation Event
Trigger (Input 2 sensor) must be placed at least 150 mm before the reading
phase start (Ext. Trigger).
The proximity sensor must be calibrated to
trigger on packs in the near zone
(140-215 mm) and therefore select the Sequence with Image Settings #1 (the
Image Acquisition Setting relative to the 195 mm Reading Distance). Packs
farther away do not trigger the proximity sensor and so the Sequence with Image
Settings #2 is selected with the Image Acquisition Setting relative to the 300 mm
Reading Distance.
The settings overlap in the range 210-220 mm and can be read by either one.
In this way the effective reading DOF covers the 140 -320 mm distance.
Within each sequence, if more than one Image Acquisition Setting is enabled, they
will be cycled as in the case where Image Settings Selection is Automatic.
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