Barcodes

barcode scanner is a device that is used to read the printed barcodes. A barcode consists of a series of parallel, adjacent bars and spaces that are decoded with the intensity of the light reflected by them. When the scanning is initialized, the scanner lens reads the entire code with the help of the light source and converts the code into 0s and 1s. The space reflects the light where as the dark bar absorbs the light. This is called digitalizing. Thus decoding is done for the barcode and the result is sent to the output device.

Types of barcode scanners:
The barcode scanners can be classified into two main categories. They are

• Contact readers: These devices are normally held in the hands. To read a barcode this type of readers must either touch the code or come close to it.

• Non-contact readers: These devices need not be close to the barcode to read the code. These scanners use either a moving beam or a stationary beam, but mostly they have a moving laser light beam. These scanners come in both handheld and fixed mount configurations.

Features of barcode readers:
The barcode scanners consist of an internal decoder and a cable, which are connected to the computer through compatible ports. It consists of a light source, a lens and a photo conductor translating optical impulses into electrical ones. Additionally, nearly all barcode readers contain decoder circuit. It analyzes the barcode's image data provided by the photo conductor and sends the barcode's content to the scanner's output port. Advanced readers use laser-scanning technology. Barcode readers are available in several forms like in hand-held, hands-free, wearable, scan engines, laser or digital.

Benefits o f barcode readers:
The benefits of the barcode readers can be classified based upon their types.
• Benefits of Contact barcode readers:

o Portable in size, simple to use.
o Suitable for small businesses
o Low maintenance
o Less in price when compared to a laser gun or a CCD...