INTRODUCTION TO COMPUTING. Presentation no:1 Scanners And Reading Devices. Group Members: . Aqsa Bibi SP11/BBA/013 Huma Rehman SP11/BBA/038 Ch Ateeq Ullah Zafar SP11/BBA/020
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Scanners And Reading Devices
Ch Ateeq Ullah Zafar
flatbed scanners except the
document is moved by the scan
head is immobile.
you use a marker highlighter.
Industry to capture incredibly
(or bar code scanner)is an
Electronic device for reading printed
RFID(Radio Frequency Identification): RFID is a technology that uses communication via radio waves to exchange data between a reader and an electronic tag attached to an object,for the purpose of identification and tracking.
RFID Makes it possible to give each product in a grocery store its own unique identifying number, to provide assets,people,Work in process,Medical devices etc.
All with unique identifiers like the license plate on a car but for every item in the world.
Radio –frequency identification involves hardware known as interrogators(also known as readers), and tags(also known as labels),as well as RFID software.
One is an integrated circuit for storing and processing data, modulating and demodulating a radio frequency .
The other is an antenna for receiving and transmitting the signal
If the reader reads tags in a stationary position,it is called fixed RFID
These fixed readers are set up specific interrogation zones and create a BUBBLE of RF(radio frequency) energy.
This allows a very difinitive reading area for when tags go in and out of interrogation zones.
If the reader is mobile when the reader reads tag,it is called mobile RFID.
Mobile readers include handhelds, carts and vehicle mounted RFID readers from manufacturer such as Motorola,sirit etc
Passive RFID tags
Active RFID tags
(BAP) RFID tags
Which have no power source and require an external electromagnetic field to initiate a signal transmission.
Which contains a battery and can transmit signals once an external source(interrogator)has been successfully identified.
Which require an external sourace to wake up but have significant higher forward link capability providing greater range.