Autoscanning; Normal Mode; Pattern Mode; Camera Control - Datalogic PowerScan M8500 Product Reference Manual

Introduction

Autoscanning

Normal Mode

PowerScan® M8500 provides an autoscan command (see
causes the reader to scan continuously and to monitor the central zone of its reading area. In
this way, PowerScan® M8500 is ready to capture any image (containing a potential code)
positioned on a uniform background.
The aiming system can be enabled to indicate the reading area of the potential code to be
captured. The illumination system can also be enabled when the ambient light conditions
are not sufficient to autodetect the potential code to be captured; furthermore, the
illumination system increases in intensity for an instant when capturing and decoding an
image. A safety time may be defined to prevent PowerScan® M8500 from reading the same
code repeatedly.
If the decoding is completed successfully, the reader starts monitoring the reading area
again. In case of decoding failure, PowerScan® M8500 keeps on decoding until a potential
code is present in the central zone of the reading area.

Pattern Mode

The Autoscan pattern mode is particularly advised when reading barcodes positioned on a
non-uniform background. In these cases PowerScan® M8500 may perceive some elements
of the background as barcodes and start the decoding. To avoid this undesired effect, the
Autoscan Pattern Code is placed in the PowerScan® M8500 reading area which prevents
decoding. Using this code as the background, code reading takes place normally by
presenting desired codes to be read over the Pattern Code. Between each code read, the
Pattern Code must be presented to the reader.
The Pattern Code can be printed from this manual (see
In case of low ambient light conditions, PowerScan® M8500 automatically activates the
illumination system. If desired, the illumination system can be enabled so that it is always
active.

Camera Control

Exposure and Calibration
Three automatic control modes are available to optimize the reading performance:
•
•
•
Refer to
20
Automatic based on entire image:
whole image. This mode works well in most standard applications. It is the default set-
ting.
Automatic based on central image:
restricted area positioned in the central zone of the image. This mode is suggested
when reading small codes positioned in a dark and extensive background.
Automatic for highly reflective surfaces:
codes on highly reflective surfaces. This mode is suggested, for example, when reading
codes positioned on plastic or metal surfaces.
CAMERA CONTROL on page 102
page
Autoscan Pattern Code in Appendix
camera control mode based on the analysis of the
camera control mode based on the analysis of a
camera control mode allowing reading of
for configuration codes.
205), which when enabled,
PowerScan® M8500
F).