Airlogic ABM-400 Manual de usuario descargar pdf (Pagina 48)

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With an understanding of the fundamental protocols that make up Bluetooth, it is now possible to

take a look at Bluetooth Profiles, which detail (in both broad and specific terms) ways in which a

developer can combine the protocols and usage models to create the basis for applications.

RFID

Radio frequency identification (RFID) is a generic term used to describe the technologies that

harness radio-frequency waves to transfer data between a reader and a tag to identify, categorize

and track objects. RFID is fast, reliable, and does not require physical sight or contact between

reader and the tagged object.

An RFID system consists of tags (also known as transponders), readers and a computing

infrastructure for storing and analyzing the data received from the reader. A transponder is

usually a memory device (e.g. Electrically Erasable Programmable Read-only Memory

EEPROM) fitted on the object to be identified. It contains information to uniquely identify an

object. The reader is capable of generating, receiving, demodulating and deciphering RF signals.

As summarized in Figure 1, the reader sends RF signal into the environment. As soon as a tag

comes into the reader’s RF electromagnetic field, the tag circuit sends signals back to the reader,

thus identifying the object. This identification technology can be used for real time object

tracking, goods and/or asset management, etc.

The tags can be classified into various types depending on whether they are active or passive,

read only and/or writable, etc. The readers too have different specifications like frequency, type

of data transmission method, etc. The selection of the tag and reader attributes strongly impact

the performance of the RFID system.

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Airlogic ABM-400 Manual de usuario Pagina 48