RESEARCH INSTRUMENTS LTD 670854 ユーザーズマニュアル
Section 4
Product Overview
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Research Instruments Ltd
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The Shared RI Witness™ Database
AnexampleRIWitness™installationisshowninFigure4-6.FourworkareaswithRIWitness™WorkArea
software, two RI Witness™ Manager PCs and an admin reader PC share a common RI Witness™
database.Traceability,RIWitness™andDataCapturemanagementfunctionsmaybeperformedat
each RI Witness™ Manager PC.
Lab
Manager
Work Area
Work Area
Shared RI Witness™ Database
Lab
Manager
Admin Reader
Work Area
Work Area
Figure 4-6 The RI Witness™ database is shared by All RI Witness™ WorkArea and RI Witness™ Manager PCs
RFID Overview
Radio-frequency identification (RFID) is the technology used by RI Witness™ to identify tagged
plasticware.
AcontrolunitfeedsanRFsignaltoamatchedantenna.AnRFIDtagispassiveuntilenergisedbythe
AcontrolunitfeedsanRFsignaltoamatchedantenna.AnRFIDtagispassiveuntilenergisedbythe
signalfromtheantenna.Theenergisedtagthentransmitsanidentificationcodebacktothesame
antenna. See Figure 4-1.
AnRFIDsystemworksontheprincipleofinductivecoupling,whichrequiresthattheantennabetuned
AnRFIDsystemworksontheprincipleofinductivecoupling,whichrequiresthattheantennabetuned
tomatchthefrequencyinuseandoptimisedforthephysicalenvironment.Specificcablelengthsmust
beusedforallRFconnections.
EachRIWitness™workarearequiresacomputer,acontrolunitandatleastoneantenna.Multiple
EachRIWitness™workarearequiresacomputer,acontrolunitandatleastoneantenna.Multiple
antennaworkareasrequireamultiplexertoswitchtheRFsignalbetweenantennas.
Antennas are built into RI Witness™ Readers.