NCR RealPOS - Features and Options; Scanning Performance; Communications Protocol

Chapter 2: Product Information 2-3
Features and Options
The 7893 is rich in features and options. This section details the features and options that are
available.
Scanning Performance
The NCR 7893 uses laser light to create a pattern of 20 scan lines. As a bar code passes
through these scan lines, the 7893 scanner uses the reflected light to identify the location of
each bar in the bar code.
The following illustration displays the scan pattern. Item scanning maybe done from left to
right or vice versa.
The image below shows the 7893 scan pattern.
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Communications Protocol
The 7893 communicates with the host terminal through the following:
 RS-232
 USB (IBM, NCR)
 PS/2 Keyboard Wedge
 USB Keyboard Wedge
 IBM RS–485