0.9 (or
C1G2 V1.0.9) (EPCglobal, 2005c). At the time of writing, other hardware speci?¬?cations
were in development, namely the HF Air Interface Protocol for Item Management, and the
EPCglobal Network 19
UHF Air Interface Protocol for Item Management UHF C1G2 V1.1.2. Both of these speci-
?¬?cations build on the command set of C1G2 V1.0.9 with HF in particular de?¬?ning a
signaling layer at 13.56 MHz, but using almost the same command set. The advantage of
using the command set is that other parts of the EPCglobal Network may be able to be
protocol agnostic.
The rest of the standards that comprise the EPCglobal Network are software elements
namely:
. Tag Data Standards
. Tag Data Translation
. Reader Protocol
. Low-Level Reader Protocol
. Reader Management
. Application Layer Events
. ECPIS EPC Information Services
. Security Certi?¬?cate Pro?¬?le
. Object Naming Service
. Drug Pedigree Standard
. EPCIS Discovery
. Subscriber Authentication
The rest of this chapter is devoted to providing a short description of each element in the
EPCglobal Network and a status of the speci?¬?cation as of April 2007.
2.3 Class 1 Generation 2
The Class 1 Generation 2 Speci?¬?cation (EPCglobal, 2005c) details the communications
between the RFID tag and the RFID reader. It contains speci?¬?cations of an air interface.
Communication between readers and tags is based on ??????Reader Talks First??™??™ principles,
whereby the reader issues commands (along with communication parameters) to a population
of tags that are in the reader??™s RF ?¬?eld.
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