Barcode reader

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A barcode reader is a device used to identify and read a bar code symbol.^[1]

Technologies

There are several technologies used for barcode readers:

Laser barcode readers use a single spot of light to sweep across the bar code in a linear fashion.
CCD barcode readers use an LED array with thousands of light detectors; the entire bar code image is captured and then transmitted.^[2]

Fixed position barcode readers are in a fixed position and read barcodes as they go by on a conveyor.

Countertop barcode readers sit on a desk or countertop and are generally designed to detect the presence of nearby objects, turn on automatically, and capture the barcode.
In-counter barcode readers are often used in grocery stores. The scanner is mounted below the surface of the counter and aims an interlocking laser beam pattern up through a glass faceplate.
Above-belt barcode readers look down from above a conveyor and read barcodes on moving containers. They are often used for high-speed package sortation.
Fixed mount barcode readers are intended for industrial applications to read barcodes on machinery, parts, or containers. They are generally built into very tough housings and are solidly mounted.^[2]

Handheld barcode readers,such as wands, are portable and may be carried from place to place, as in a warehouse.

There are a number of reader interfaces commonly used for barcode reading:

Keyboard wedge barcode readers attach to a computer through a keyboard.
Serial port / USB barcode readers attach to a computer directly through a USB or serial port.
Short-range RF barcode readers are wireless handheld readers that use RF signals to communicate.
Portable batch barcode readers are handheld readers with a keyboard and display.
RF wireless systems use a private digital network to communicate.^[3]