Motorola SE3300, Integration Manual

Page: 17 / 74

Getting Started 1 - 3
Aiming System
A 617 nm LED is used to generate a circular aiming pattern which indicates the center of the imager’s field of
view.
Aiming Pointing
The aiming pattern is rotated by 2.1
o
relative to the imaging axis in the vertical plane to minimize parallax
between the aiming axis and the imaging axis at 204 mm (8 in.) from the engine.
Aiming Control
The SE3300 can capture images with both the aiming subsystem turned on during exposure (the image of the
aiming pattern is visible in the digital image) or off. If the aiming system is turned off during exposure,
brightness of the aiming pattern decreases as exposure increases.
The aiming subsystem can also be turned off completely. Motorola recommends shutting aiming off three
frames prior to capturing documents to prevent the aiming pattern from appearing faintly in captured images.
Note that this is not necessary for bar code decoding.
Illumination System
The illumination system consists of two high-output, red LEDs (625 nm) and a sophisticated drive system that
allows image capture and decoding throughout a full range of lighting conditions (total darkness to full
sunlight).
Illumination Control
The SE3300 can capture images with the illumination subsystem turned on or off, accommodating images that
are close to the wavelength of the illumination. For example, since the engine uses red LED illumination, it may
be desirable to shut off the illumination when capturing an image printed in red ink.
LED illumination can also be turned off when taking images of documents printed on semi-glossy or glossy
paper or on a substrate with security marks. In this case, ensure ambient illumination provides minimum 30 fcd
on the document surface. See also
Thermal Considerations on page 2-2 .
Frame Rate Control
The SE3300 outputs images at 60 frames per second by default. When capturing images, use lower frame
rates to increase image brightness. The aiming pattern appears to blink when the frame rate is 30 fps or lower.