Hand Held Products 4410, 4710 Centering, Window Position Default Minimum Maximum Serial Command

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.

Window Position	Default	Minimum	Maximum	Serial Command
Top of centering	210	000	239	DECTPYxxx
window
Bottom of center-	270	240	479	DECBTYxxx
ing window
Left of centering	290	0	319	DECTPXxxx
window
Right of centering	350	320	639	DECBTXxxx
window

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.

On * Off

The figure below illustrates the default top, bottom, left, and right pixel positions. The position of the pixels is measured from the top and the left side of the

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