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Centering
Use the centering feature to narrow the imager’s field of view to make sure that
the imager reads only those bar codes intended by the user. For instance, if
multiple codes are placed closely together, centering will insure that only the
desired codes are read. When centering is turned on, the imager only reads
codes that intersect the centering window set up by the user. The centering
window must intersect the center of the image. If a bar code is not within the
predefined window, it will not be decoded or output by the scanner.
If centering is turned on by scanning the On bar code below, the default centering
window is a 60 pixel square area in the center of the imager’s field of view. The
position of the window may be changed by scanning the top, bottom, left, and
right centering bar codes that follow and the appropriate pixel value, if other than
the default, from the Programming Chart in the back of this manual. The defaults
are listed in the table below.
The centering function can be used in conjunction with the Aimer Delay feature
(page 2-18) for the most error-free operation in applications where multiple
codes are spaced closely together. Using the Aimer Delay and Centering
features, the imager can emulate the operation of older systems, such as linear
laser bar code scanners.
Window Position Default Minimum Maximum Serial Command
Top of centering
window
210 000 239 DECTPYxxx
Bottom of center-
ing window
270 240 479 DECBTYxxx
Left of centering
window
290 0 319 DECTPXxxx
Right of centering
window
350 320 639 DECBTXxxx
* OffOn