NCR 7800 - Laser Scanning; Bar Code Types

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An ambient light sensor detects a customer’s presence and
activates the scanner. The consumer lifts the item up toward
the window and the laser scanner reads the bar-code label on
the product. Once the bar-code label is read, a tone sounds
and the price and description of the item are displayed.
The NCR 7800 does not have an on/off switch, but it contains
circuitry that turns the laser scanner off if a label is not
scanned within several seconds. This minimizes the amount
of time the laser is on and reduces wear on the unit.
The price verifier 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. A deflector mirror directs
the light out the scan window. Reflected light from the bar
code is then collected and decoded to determine the bar-code
data. The bar code data is sent to the host terminal or store
controller where it is analyzed. The price and description data
is then sent back to the price verifer for display.
The NCR 7800 produces an omnidirectional scan pattern that
makes scanning easier. The pattern looks as if several lines
are scanning simultaneously, but is actually a single beam
reflected through several mirrors. It is this pattern that enables
the NCR 7800 to read bar codes from most orientations.
The price verifier reads:
• UPC/EAN/JAN
• Code 128
• Code 39
• Interleaved 2 of 5
Laser Scanning
Bar Code Types