Rice Lake Motorola DS457 Laser Scanner - Manual (Page 44)

3 - 2 DS457 Fixed Mount Imager Integration Guide
Aiming Control
The DS457 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.
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 DS457 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 imager uses red LED illumination, it may
be desirable to shut off the illumination when capturing an image printed in red ink.
It is recommended to turn off LED illumination and provide minimum 30 fcd ambient light on the document
surface when taking images of documents. Even a small amount of dust or fingerprints on the imager window
can scatter the LED illumination and create glare in the image. The glare reduces quality of document images
but does not affect bar code reading.
Frame Rate Control
The DS457 outputs images at 60 frames per second by default. When capturing images, use lower frame rates
to increase image brightness. The aiming pattern and illumination appear to blink when the frame rate is 30 fps
or lower.