ifdefs considered harmful by Spencer H.

By Spencer H.

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Manchester encoding is a simple type of data extraction that does not require any additional information about the transmit clock—in other words, self-clocking where bits are transmitted over a predefined period of time. The major encoding methods used inductive and/or capacitive coupling RFID systems are: • Nonreturn to zero (NRZ) direct: In this method a binary “1” is represented by one significant condition (logic high level) and a binary “0” is represented by another (logic low level) [4]. • Manchester encoding: Also called split phase encoding, this encod- ing mechanism does not require any additional information about the transmit clock (self-clocking).

2 Active Systems, UWB, Zigbee, and Wi-Fi Tags RFID systems that include an onboard battery as a power source for the tag are classified as active systems. These systems typically differ from the reader-tag communication explained above in two major ways: 1. The 433-MHz RFID systems, typically referred to as the active systems, are nonstandardized systems. 2. Other systems such as UWB, Zigbee, and Wi-Fi RFID tags use their own established protocols and so depending on the 46 RFID-Enabled Sensor Design and Applications • China: Ministry of Information Industry; • Japan: Ministry of Internal Affairs and Communications (MIC); • South Korea: Ministry of Commerce, Industry, and Energy; • Malaysia: Malaysian Communications and Multimedia Commis• • • • • • sion (MCMC); Taiwan (China): National Communications Commission (NCC); South Africa: Independent Communications Authority of South Africa (ICASA); Australia: Australian Communications and Media Authority; New Zealand: Ministry of Economic Development; Singapore: Infocomm Development Authority of Singapore; Brazil: Agência Nacional de Telecomunicações (Anatel).

This section will group together the different layers used in RFID communication: data link, presentation, and application layers as described in Generation 2 (EPC Gen2), a standard that defines the physical and logic requirements for passive-backscatter RFID systems operating at 860–960 44 RFID-Enabled Sensor Design and Applications MHz, and which are regarded as the most practical and cost effective RFID systems. 6. These protocols define the commands used between the reader and tag within the read range, how the memory is organized, and anticollision algorithms.

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