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AS Level ICT


AS Level ICT Selection and use of input devices and input media: Capturing transaction data – PowerPoint PPT presentation

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Title: AS Level ICT

AS Level ICT
  • Selection and use of input devices and input
    media Capturing transaction data

Selecting suitable input methods
  • An ideal solution to the inputting of data would
    make it
  • Automatic
  • Fast
  • Cheap
  • Accurate
  • When entering transaction data, these ideals
    become necessities rather than being priorities

Transaction data capture devices
  • The most common types of transaction data capture
    devices are
  • Readers (including magnetic strip readers,
    barcode readers, optical character
    readers/recognition, magnetic ink character
    readers/recognition, and optical mark
  • Touch screens
  • Terminals (including hand-held, EPOS, and EFTPOS

Magnetic strip readers
  • The most common magnetic tape readers are those
    used at electronic points of sale (EPOS)
  • These read the personal data stored on the
    magnetic strip of a credit or debit card

Magnetic strip readers
  • The encoded on the magnetic tape on a credit or
    debit card includes
  • The account number
  • The expiry date of the card
  • Security data

Magnetic strip readers - Advantages
  • The advantages of using magnetic strip input are
  • Fewer errors data does not need to be keyed in
  • Added security the encoded security details are
    not visible and this reduces (but does not
    remove) the possibility of fraud
  • It is fast the data on the magnetic strip is
    read almost instantly

Magnetic strip readers - Disadvantages
  • The disadvantages of using magnetic strip input
  • The strips can be damaged by scratching (e.g. if
    it is not stored properly between usages) or
    magnetic fields (e.g. if placed near a CRT
    computer terminal or mobile phone)
  • Credit and debit cards can be lost or stolen
    (often with information such as the PIN
    Personal Identification Number - that will
    enable the thief or finder to access the card)

Magnetic strip readers - Disadvantages
What has been added to most credit and debit
cards to improve the level of security? What
changes has this additional security made to the
process of accessing data stored on magnetic
Touch screen
  • The touch screen is a special type of screen
    which is sensitive to touch
  • Selections can be made by touching the screen
  • These are particularly useful in banks, building
    societies, and shops, where customers who are not
    used to using a keyboard can interact with a
    computer system
  • They are also used in some satellite navigation
    systems where a keyboard would be difficult or
    dangerous to use

Touch screen
Barcode readers
  • Barcodes are used
  • In supermarkets to record what stock has been
    delivered and then sold
  • In warehouses as part of the stock control system
  • In parcel tracking systems
  • As a means for libraries to link users to books
    borrowed and returned
  • On luggage labels at airports and docks

Barcode readers
  • The lines on a barcode represent numbers, and can
    be scanned very quickly using a laser scanner

Barcode readers - Advantages
  • The advantages of barcode readers are
  • Speed of input a barcode reader can read a
    barcode much faster than a human can input the
    same data
  • Accuracy unless the barcode is damaged (e.g.
    folded or torn) it can be read correctly
  • Cheapness barcodes can be printed directly onto
    packaging or labels

Barcode readers - Disadvantages
  • The disadvantages of barcode readers are
  • They can only read numbers expressed in the form
    of different thicknesses and combinations of
  • The system can be expensive to set up and
    maintain (e.g. barcode readers have to be
    installed at the tills in shops they then
    require a computer system with suitable
    software installed to operate)

POS terminals
  • POS (Point Of Sale) terminals come in a variety
    of forms
  • Touch screen displays (e.g. ticket machines at
    cinemas and railway stations)
  • Keyboards (e.g. concept keyboards in fast food
  • Magnetic strip readers (e.g. chip and pin
    payment machines in shops)
  • Barcode readers (e.g. automatic tills in

POS terminals
  • Barcode reader
  • Touch screen
  • Magnetic strip reader

POS terminals
  • EPOS (Electronic Point Of Sale) and EFTPOS
    (Electronic Fund Transfer at Point Of Sale)
    terminals are connected, via secure Internet
    connections, to the computers of the main banks
    and credit card companies
  • EPOS and EFTPOS allow a retailer to transfer the
    cost of what they have sold to a customer from
    the customers credit card or bank account to
    their own bank account

POS terminals
  • This is much faster than accepting payment by
    cheque, and more secure than accepting payment in
  • It also gives the retailer an opportunity to
    collect information about their customers, and to
    develop individual customer profiles (i.e. know
    what an individual customer may want to buy)
  • This helps to retailer to target individual
    customers with special offers etc

AS Level ICT
  • Selection and use of input devices and input
    media Capturing transaction data