- There are two types of barcodes linear and 2D. The most visually recognizable, the UPC(Universal Product code).
- A linear barcode is madeup of two parts: the barcode and 12-digit UPC number.
- First 6 digits are for manufacturer's identification number.
- Next 5 digits are to represent the item's number.
- The last number is called check digit it enables the scanner to determine if the barcode is scanned properly or not.
- When it is comming to 2D barcode it include more information in the code. 1. Price.
- Linear barcode scanner cannot read 2D barcode.
- To read 2D barcode we require a image scanner.
- Most scanners consists three different parts. 1. Illumination system.
- In general barcode scanner scans the black and white elements of the barcode by illuminating the code with a red light.
- Which is then converted in to the matching text.
- The sensor in the barcode scanner detects the reflected light from the illumination system(the red light) and generates an analog signal that is sent to the decoder.
- The decoder interprets the signal, validates the barcode using check digit, and converts it in to text.
- This converted text is sent to computer software system by scanner holding a database of the maker, cost and quantity of all products sold.
2. Quantity.
3. Web address or image.
2. Sensor.
3. Decoder.
