Scanning (Imager); Scanning; Operational Modes; Decode Mode - Symbol PDT 7500 Series Product Reference Manual

PDT 7500 Series Product Reference Guide for Windows

Scanning (Imager)

The Imager has the following features:
omnidirectional reading of a variety of bar code symbologies, including the most
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popular linear, postal, PDF417, and 2D matrix code types.
the ability to capture and download images to a host for a variety of imaging
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applications.
advanced intuitive laser aiming for easy point-and-shoot operation.
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Scanning

The Imager uses digital camera technology to take a digital picture of a bar code, stores the
resulting image in its memory, and executes state-of-the-art software decoding algorithms to
extract the data from the image. A typical bar code decoding process is as follows:
1. The user aims the Imager and presses the scan button.
2. The red laser aiming pattern turns on to assist in aiming the Imager.
3. If necessary, the Imager turns on its red LEDs to illuminate the target bar code.
4. The Imager takes a digital picture (image) of the bar code and stores it in memory
for decoding.
5. A decode beep occurs and the Imager transmits the bar code data to the host.
6. The user releases the scan button.
This process usually occurs instantaneously. Steps 2 - 4 are repeated on poor or difficult bar
codes as long as the scan button remains pressed.

Operational Modes

The Imager has two modes of operation: Decode Mode and Image Capture Mode, activated
by pressing the scan button.
Decode zones for the Imager on the PDT 7500 are provided in

Decode Mode

In this default mode, upon pressing the scan button, the Imager attempts to locate and decode
enabled bar codes within its field of view. The Imager remains in this mode as long as the scan
button is pressed, or until a bar code is decoded.
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Appendix A, Specifications