Barcode Scanners

The bar code reader is a handheld or stationary device used to capture and read information from a bar code. A bar code reader consists of a scanner, a decoder (either embedded or externally) and a cable to connect the reader to a computer. Captured data is translated into numbers and / or letters to be transmitted to the computer so that the existing software application identifies them.

Barcode scanners can be connected to a computer via a serial port, keyboard port, or an interface device called 'wedge'. The mode of operation consists in directing a beam of light over the bar code and measuring the amount of light that is reflected back. The scanner converts the light energy into electrical energy, which is then transformed into data by the decoder and transmitted to the computer. The scanner converts the light energy into electricity, which is then converted into data by the decoder and transmitted to a computer.

There are four basic types of barcode readers - "pen", CCD (or LED), image scanners and laser scanners.

The "pen" scanner is the simplest barcode reader. It does not contain moving parts and is known for its strength and convenient price. However, it can be a challenge for the user, because he has to stay in direct contact with the bar code, must be kept at a certain angle and must be moved over the bar code at a certain speed.
A CCD reader has a better reading radius than the pen scanner and is often used in retail sales. Typically, a CCD scanner has a "gun" interface, and must be kept no more than one centimeter from the bar code. Every time the barcode is scanned, multiple readings are taken to reduce the risk of errors.
An image scanner uses a small video camera to capture a barcode image and then uses sophisticated image processing techniques to decode the barcode. A bar code can be read from about 7 to 22 inches away, and generally costs less like a laser scanner.
A laser reader, whether hand or stationary, should not be close to the bar code to do its job. It uses a system of mirrors and lenses to allow the reader to read the bar code, regardless of orientation. Can easily read a bar code of up to 60 centimeters away, and to reduce the possibility of errors, the reader can perform up to 500 scanning


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