Direct Data Entry Device - Computer Education

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Tuesday, September 11, 2018

Direct Data Entry Device

Direct Data Entry Device :- A direct data entry device can transfer infornation automatically from a source document such as a form of bar code into the computer. The user does not need manually enter the information. Direct data entry devices are used when large volumes of data must be entered into the computer quickly.
Eg - Bar Code Reader, Magnetic Ink Characker Reader, Magnetic Stripe Code, Smart Card, Optical Mark Reader, Optical Character Reader etc.


Bar Code Reader :- Bar Codes are often printed on products that we buy and are used by shops to produce bills for customers. A bar code is made up of a sequence of bars of different widths. Different groups of bars are used to represent different numbers. A printed bar code is therefore simply a way of representing a number. Bar codes are read into the computer using a special type of scanner. Bar codes are not easily damaged and can normally still be read if they are scratched or not stuck onto a flat surface. The information normally included on a bar code for a product's country or origin, manufacturer and item code.

Magnetic Stripe Codes :- Magnetic stripes are built into many plastic cards such as credit cards. The stripe can contain upto 60 character which is stored magnetically. Magnetic stripe codes can also sometimes be found on the back of railway tickets. To read the card it should swiped through a machine which quickly and accurately reads the pattern of magnetism. The information stored on the card can be destroyed by exposure to magnetic fields, by scratching or by coming into contact with some liquids.

Magnetic Ink Character Reader (MICR) :- The MICR system reads characters printed in a special magnetic ink into the computer. The main users of MICR are banks. They use it to read information from cheques into their computers so that the cheques can be cashed. The information printed on the cheque using MICR are - 
* A unique number for the cheque.
* A code that identifies the bank and branch that issued the cheque.
* The number of the account that the cheque related to.

Smart Cards :- Smart cards are often called input devices. Infact they are actually simple storage devices. A smart card contains a small RAM chip. When the card is put into a machine data can be read from the card or written onto it. A smart card can store much more data than a magnetic stripe can.

Optical Character Reader (OCR) :- An OCR system consists of a scanner and some software. The scanner is used to scan an image of a page or text to be read into the computer. The software then examines the page and extracts the text from it, storing it in a form that can be processed.

Optical Mark Reader (OMR) :- An optical mark reader reads marks made by pencil on a printed form into the computer. OMR systems are used by examination boards to collect the answers to multiple choice examinations.

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