BAR CODE SCANNER A.ANUSHA (06N61A0402). What is bar code? A barcode is a machine readable representation of information. Barcode stores data in widths.

BAR CODE SCANNERBAR CODE SCANNER

A.ANUSHA

(06N61A0402)

What is bar code?What is bar code?

A barcode is a machine readable representation of information.

Barcode stores data in widths and spacing of printed parallel lines.

They also come in patterns of dots, concentric circles.

BAR CODE TECHNOLOGYBAR CODE TECHNOLOGY

It is an automatic identification technology Bar code is a predefined format of dark bars and white spaces Structured to contain a specific piece of information It allows real-time data to be collected accurately and rapidly Combination of barcode technology with computer and

application software improves performance, productivity and profitability

Representation of bar code:Representation of bar code:

Barcode Terminology:Barcode Terminology:

Quiet zone: represents the right and left end of the bar code symbol.

Start/stop character: indicates start or end of the data.

Data (message): bar patterns of character representing data.

Check digit: a numeric value calculated for read error.

Types of barcode:Types of barcode:

1-D: contains 16 alphanumeric characters 2-D (QR,data matrix): stores up to 700

characters

Discrete SymbologyDiscrete Symbology

Continuous SymbologyContinuous Symbology

Information stored on a barcodeInformation stored on a barcode

Product identificationSize/weight of a productWhere the product has come fromWho manufactured the product

Information not stored on a Information not stored on a barcodebarcode

Product name

Price of the product

What is Bar code scanner?What is Bar code scanner?

– Computers cannot read bar codes. For a computer to make use of the information contained in the barcode data must be captured and decoded into a data format that the computer can process. the device that reads the bar code data and sends it to the decoder is known as bar code reader

Types of barcode scannerTypes of barcode scanner

Pen based scanner:

CCD(charge coupling device) barcode scanner

Laser scanners

Camera based scanners

Parts of barcode scannerParts of barcode scanner

A bar code reader consists of a scannerdecoder (either built in or externally )Cable (used to connect reader with a pc)

BAR CODE SCANNERSBAR CODE SCANNERSA device used to extract information optically from

a Bar Code

Bar Code symbol consists of series of vertical dark

bars separated by light spaces

When illuminated reflected light is detected by

electro optical sensor

The intensity of reflected light from the dark bars is

less than that of spaces

SCANNERS …SCANNERS …

Reflected light is converted into electrical

voltage signals

Analog voltages are digitized into raw data

The decoder converts this data into the character

data representation of the symbol’s code

TYPES OF SCANNERS (READERS)TYPES OF SCANNERS (READERS)

CONTACT READERS

– Must touch or come in close proximity of symbol

– Good where the label cannot be placed in an easy-

to-view position

– Normally hand-held/stationary units

– Common type is pen/wand reader

– A high-density resolution wand used to read a low-

density symbol might see an ink spot as bar or an

ink void as a space

CONTACT READERSCONTACT READERS … …

A low-resolution wand may not be able to

recognize a narrow bar of high-density

symbol

Positioned angle of wand to the surface and

movement speed across the symbol are key

parameters

Contact ReadersContact Readers

NON-CONTACT READERSNON-CONTACT READERS

Reader need not come in contact with symbol

Scan distance may be from 6” to several feet depending upon symbol size and scanner design

Hand-held, fixed beam readers

Bar-code systemBar-code system

Types of output interfacesTypes of output interfaces

Keyboard wedge: when one scan a barcode with a keyboard wedge scanner the data that is encoded in a barcode goes into the pc through the keyboard port.

RS-232:this means that you would connect the bar code scanner directly to an available RS232 serial port on the back of your pc.

USB output: they can work either as keyboard wedge or as RS232 serial output scanner

APPLICATIONSAPPLICATIONS … …RETAIL APPLICATIONS

– Super markets– Counter-mounted Bar Code scanners– Universal Product Code (UPC)– Price and description information

WARE HOUSINGHEALTH CARE APPLICATIONS

– Drugs, devices, instruments– Identification of expiry date– Blood banking

Blood groupExpiry dateDonor traceability

APPLICATIONS …APPLICATIONS …

BENEFITS OF BAR CODINGBENEFITS OF BAR CODING

REPRESENT UNIQUE IDENTITY OF A PRODUCT

ACCURACY OF DATA INPUT (ERROR FREE)

AID EFFECTIVE MANAGEMENT OF RESOURCES

AND INVENTORIES

LABOUR SAVINGS BY AVOIDING MANUAL

SYSTEM

Future Future

Barcode future seems to be advancing technology towards a new technology called bokodes.

They can transmit information directly to cell phones about products,expiry date, quantity .

Thank You