Zusammenfassung der Ressource
Networks 2
- Stand alone
and networked
computers
- Stand alone
- Less liable to get hacked
- No comms with other computers
- Need own
printer,scanner,software
etc
- Networked computer
- Needs extra protection, ie firewalls
- Potential data sharing
- Can share printers,
scanners, software etc
- EPOS systems
- item purchased is Idnetified
- data sent to main computer
- looks through database
to find item details
- description and price
displayed on screen
- after all items are processed
total bill is calculated
- receipt is printed
- customer pays with cash or card
- Data capture
- Barcodes = 13 digits in 4 sections
- 2 digits for where the item was made
- 5 digits for manufacturer
- 5 digits identify the product
- 1 check digit for verification
- Advantaged of barcodes TO CUSTOMER
- fewer pricing mistakes
- faster service
- given itemised recipet that they can check
- Disadvantages
- Price not found on the item so
they must find the place that it
lives or a self scan station
- scratched or crumpled
barcodes take longer
and could cause queues
- Advantages of barcodes TO SHOP
- No price tags needed
- automatic stock control
- patterns can be analysed
- fraud is minimised by
switching price tags
- Optical mark recognition
- detect small marks on
paper when scanned
- Used in multiple
choice exams and
lottery tickets
- Advantages
- Fast method of filling in forms
- fats method of reading forms
- disadvantages
- forms can be large and have too many options
- May be filled in incorrectly and cannot be marked
- Optical character recognition
- reads text and can
process it into a
word document
- Offers fast input of data
- Poor accuracy (handwritten)
- Machine readable tags
- Some items have scanable tags
- can be scanned by a
machine and update the
stock control automatically
- Advantages
- Automatic stock control update
- tags provide a record of daily sales
- Disadvantages
- customers may damage tags
- update at end of day so
not always up to date
- Portable data entry
- PDET can be carried around and scan items
- then connected to the computer
and updates the stock control
- can be wirelessly downloaded
- gather data about eh amount of stock availble
- log data about items sent away by vans
- traffic wardens on setting tickets
- Touch sensitive data entry
- Input data by touch
screen, patients
register them
selves using them
- Low level ICT skills needed
- Little possibility of damage or theft
- Dirty/scratched can make them hard to use/difficult to read