Airlogic ABM-400 Manual de usuario descargar pdf (Pagina 55)

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Figure14.

Tag Data Position

Table4.

Tag Classification based on EPC Global Protocol

EPC

Class

Description Functionality

Remarks

0 Read Only Passive tags

Data can be written only once

during tag manufacturing and

read many times

Write Once and

Read only

Passive tags

Data can be written only once

by tag manufacturer or user and

read many times

2 Read/Write Passive tags

User can read/write data many

times

3 Read/Write

Semi-passive

tags

Can be coupled with on board

sensors for capturing parameters

like temperatures, pressure, etc.

4 Read/Write Active tags

Can be coupled with on board

sensors and act as radio wave

transmitter to communicate with

reader

• ISO/IEC 18000 series

ISO & IEC have established Joint Technical Committee to address technology standards.

Within JTC -1, Subcommittee 31, Work Group 4 deals with RFID. ISO 15693 and ISO 18000

series provide air interface standards for communication between tag-reader and reader-tag at

LF, HF, UHF and microwave frequencies. These standards also specify parameters like data

encoding rules, data transmission rates, types of signal modulations and anti-collision protocols

[6], [7].

• 18000-1 Part 1 - Generic Parameters for the Air Interface for Globally Accepted

Frequencies

• 18000-2 Part 2 - Parameters for Air Interface Communications below 135 KHz

• 18000-3 Part 3 - parameters for Air Interface Communications at 13.56 MHz

• 18000-4 Part 4 - Parameters for Air Interface Communications at 2.45 GHz

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