NCR RealScan 7892 Bi-Modal Presentation Scanner

Chapter 1: Introduction 1-3
Laser Scanning
Although the RealScan 7892 is very simple to use, it is quite a complex
electronic device. It contains a laser module that generates a low-level
laser light. The laser light passes through a series of mirrors to generate
a scan pattern. Reflected light from the bar code is collected and
decoded to determine the bar code data. The scanner then sends the
information to the host terminal or personal computer (PC).
The RealScan 7892 produces an omnidirectional scan pattern that
makes scanning easier. The pattern looks like several lines are scanning
simultaneously, but is actually just a single beam reflected through
several mirrors. It is this pattern that enables the scanner to read bar
codes from most orientations.
After reading the information contained in the bar code, the RealScan
7892 sends the information to the host terminal or PC. Interfaces
available with the RealScan 7892-0100 for transmitting information are
OCIA NCR Short, OCIA NCR Long, OCIA Non-NCR, RS-232, IBM
468x/469x, IBM-USB or NCR/RS-232 USB using a USB Dongle. The
RealScan 7892-0200 supports Keyboard Wedge, although using
different cables. The RealScan 7892 contains all the necessary
electronics and firmware for each of these interfaces. When installing
the scanner, you can change the interface selection, if needed. Refer to
Chapter 5, Programming and Chapter 6, Troubleshooting.