Nordic ID SCCNUR05WL2 User manual

2013‐09‐27

NUR‐05WL2ImplementationGuidev1.1

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NUR‐05WL2IMPLEMENTATIONGUIDE

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2013‐09‐27

NUR‐05WL2ImplementationGuidev1.1

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Changehistory

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VersionDateAuthorRemarks

0.12.1.2013ToniHeijariinitialversion

0.26.3.2013ToniHeijariminoradditions

0.34.4.2013ToniHeijarichangedsections1.3and4.1

1.012.6.2013ToniHeijarifirstreleasedversion

1.12.9.2013ToniHeijariChangedsection11.2and11.3

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Tableofcontents

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1 GENERAL DESCRIPTION ......................................................................................................................... 5

1.1 Block diagram.................................................................................................................................... 5

1.2 Key features ...................................................................................................................................... 5

1.3 Typical application schematics.......................................................................................................... 6

2 ELECTRICALCHARACTERISTICS........................................................................................................................ 7

2.1 Absolute maximum ratings................................................................................................................ 7

2.2 DC characteristics ............................................................................................................................. 7

2.3 RF characteristics.............................................................................................................................. 7

2.4 Performance characteristics.............................................................................................................. 8

3 PINASSIGNMENTS......................................................................................................................................... 9

3.1 Pin designation.................................................................................................................................. 9

3.2 Pin mapping....................................................................................................................................... 9

3.3 Signal description............................................................................................................................ 10

4 OEMDESIGNCONSIDERATIONS.................................................................................................................... 12

4.1 RF output and antenna requirements ............................................................................................. 12

4.2 Power supply................................................................................................................................... 12

4.3 USB device port .............................................................................................................................. 13

5 RFPARAMETERS.......................................................................................................................................... 14

5.1 TX level............................................................................................................................................ 14

5.2 Receiver sensitivity.......................................................................................................................... 14

5.3 Leakage cancellation....................................................................................................................... 14

5.4 Modulation....................................................................................................................................... 15

5.5 Link frequency................................................................................................................................. 15

5.6 RX encoding (Miller encoding)........................................................................................................ 15

5.7 Region............................................................................................................................................. 16

6 READINGPARAMETERS................................................................................................................................18

6.1 Q-value............................................................................................................................................ 18

6.2 Session............................................................................................................................................ 18

6.3 Rounds............................................................................................................................................ 19

6.4 Selecting the right reading parameters........................................................................................... 19

7 GPIOCONFIGURATIONS ............................................................................................................................... 21

7.1 Input / output.................................................................................................................................... 21

7.2 Predefined functions........................................................................................................................ 21

8 DIAGNOSTICFUNCTIONS.............................................................................................................................. 24

8.1 Reflected power measurements...................................................................................................... 24

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8.2 Channel scanner............................................................................................................................. 24

8.3 Received signal strength (RSSI)..................................................................................................... 24

9 DIMENSIONS ............................................................................................................................................... 25

9.1 Mechanical dimensions................................................................................................................... 25

9.2 Land pattern .................................................................................................................................... 27

9.3 Paste stencil.................................................................................................................................... 28

9.4 Packing tray dimensions ................................................................................................................. 29

10 SMTASSEMBLYPROCESSANDTHERMALPROCESSING ................................................................................... 31

10.1 Storage conditions........................................................................................................................... 31

10.2 Soldering process............................................................................................................................ 32

11 REGULATORYAGENCIESINFORMATION ........................................................................................................ 34

11.1 European Union and EFTA countries ............................................................................................. 34

User’sGuideRequirements ................................................................................................................ 34

LabelingRequirements....................................................................................................................... 37

ApprovedAntennas ........................................................................................................................... 37

11.2 FCC................................................................................................................................................. 38

User’sGuideRequirements ................................................................................................................ 39

LabelingRequirements....................................................................................................................... 39

ApprovedAntennas ........................................................................................................................... 40

11.3 Industry Canada.............................................................................................................................. 40

LabellingRequirementsfortheHostdevice ......................................................................................... 41

CertifiedAntennas ............................................................................................................................. 41

11.4 Industrie Canada............................................................................................................................. 42

Exigencesapplicablesauxappareilshôtes............................................................................................ 42

Typesd'antennesacceptables............................................................................................................. 42

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2013‐09‐27

NUR‐05WL2ImplementationGuidev1.1

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1 GENERAL DESCRIPTION

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NUR‐05WL2isanextgenerationcompactUHFRFIDreader/writermodule.Itiscompatiblewith

ISO18000‐6C(EPCC1G2)standard.ModulefulfillsETSI,FCCandICradioregulations.Itisalso

compatiblewithDRM(densereadermode)requirements.Maximumoutputpoweris+27dBmandit

canbeadjustedviaSWAPIwith1dBsteps.Maximumsensitivityis‐80dBm.

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1.1 BLOCKDIAGRAM

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1.2 KEYFEATURES

• SMTcompatiblemodulewithextremelysmallfootprint

• ISO18000‐6C(EPCC1G2)fullprotocolsupport+customcommands

• Lowpowerconsumptionwithhighnoiserejection

• DRMcompatible

• Highperformancewith+27dBmoutputpower,adjustableby1dBsteps

• ApprovedbyETSI,FCCandICtelecommunicationorganizations

• SelectableRFparameters;RXcoding,linkfrequencyandmodulation

• UARTandUSB2.0communication

• 5programmableGPIOwitheventtrigger

• Autosensinginventoryparametersupport

• Increasedsensitivitywithautomaticleakagecancelation

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1.3 TYPICALAPPLICATIONSCHEMATICS

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Typicalapplicationschematicincluding:USBconnectionwithESDprotectioncircuitry,2GPIOoutputs

forLEDindicators,GPIOtriggerinput,NUR‐05WL2moduleandMMCXantennaconnector.

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 Asimpleapplicationschematic.

 

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2 ELECTRICALCHARACTERISTICS

2.1 ABSOLUTEMAXIMUMRATINGS

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Violatingthesevaluesmaycausedamagetothemodule.Alsocorrectoperationisnotguaranteedif

operatingoutsidethesevalues.NUR‐05WL2isESDsensitivecomponentsoitmustbehandledwithcare.

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AbsolutemaximumratingsValue

Operatingtemperature‐20°Cto+55°C

Storagetemperature(packageunopened)‐30°Cto+85°C

Supplyvoltageandenable+6.0V

GPIOpins+4.0V

Otherpins+4.0V

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2.2 DCCHARACTERISTICS

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Typicalvalues(VCC_3V6_IN=3.6V@+25°C)

SymbolParameterMinTypMaxUnits

Vext Supplyvoltage3.43.65.5V

Iext Supplycurrent‐0.8A1AmA

Isource GPIOsourcecurrent‐‐3mA

Isink GPIOsinkcurrent‐‐6mA

Vlow GPIOinputlow‐levelvoltage‐‐0.8V

Vhigh GPIOinputhigh‐levelvoltage 2.0‐ ‐ V

Ven Moduleenablevoltage1.2‐ SupplyV

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2.3 RFCHARACTERISTICS

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Typicalvalues(VCC_3V6_IN=3.6V@+25°C)

SymbolParameterMinTypMaxUnits

Sens Receiversensitivity(datasensitivity

PER=0.1%/LBTsensitivity)‐ ‐ ‐70/‐80dBm

Pout Outputpower8±2‐ 27±2dBm

Padj Poweradjustmentstep‐1‐ dB

S11 VSWRrequirement‐‐1,5:1@50Ω

DrÆtReadertotagdatarates ‐ 40/80‐ kbps

DtÆrTagtoreaderdatarates2064320kbps

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2.4 PERFORMANCECHARACTERISTICS

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Theperformanceofthereadermoduleishighlydependentonthetestenvironment,readerantennaand

tagperformance.Interferencesfromotherradiosourcesoperatinginthesamefrequencymaydecreasethe

performance.AlsothetagantennaandthetagICmayhavesignificanteffectonthevaluespresented

below.Alsoselectedradioandinventoryparametershavegotabiginfluencetoreadingperformance.

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Typicalvalues(VCC_3V6_IN=3.6V@+25°C)

SymbolParameterMinTypMaxUnits

Rdist Typicalreadingdistancewith5dBiantenna‐ 5‐ m

Rrate Typicalreadingrate‐200‐ tags/s

Otemp Operationtemperature‐20‐ +55°C

Hrel Relativehumidity 10‐ 95%

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3 PINASSIGNMENTS

3.1 PINDESIGNATION

Throughtopview.

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3.2 PINMAPPING

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PinnumberSignalnamePintypeDescription

1RFUBidirectionalRFU(donotconnect)

2GPIO_5Bidirectional3.3VGPIO

3GPIO_4Bidirectional3.3VGPIO

4GPIO_3Bidirectional3.3VGPIO

5GPIO_2Bidirectional3.3VGPIO

6GPIO_1Bidirectional3.3VGPIO

7ERASEInputDNU(donotuse)

8RXInputDatafromHosttoModule

9TXOutputDatafrommoduletoHost

10USB_DNBidirectionalUSB–(deviceport)

11USB_DPBidirectionalUSB+(deviceport)

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12USB_DETInputUsedonlyforUSBdetection

13VCC_3V3_OUTSupplyoutputDNU(onlyfortestingpurposes)

14MODULE_ENInputDrivinghighwillenablethemodule

15GNDSupplyinputGround

16NCNotconnectedinternallynotconnected

17VCC_3V6_INSupplyinputSupplyvoltageinput

18RFUBidirectionalRFU(donotconnect)

19RFUBidirectionalRFU(donotconnect)

20GNDSupplyinputGround

21GNDSupplyinputGround

22GNDSupplyinputGround

23GNDSupplyinputGround

24GNDSupplyinputGround

25GNDSupplyinputGround

26GNDSupplyinputGround

27RF_OUTBidirectional50ΩRFoutput/input

28GNDSupplyinputGround

29GND/RF_DIFBidirectionalRFU(donotconnect)

30GNDSupplyinputGround

31NCNotconnectedinternallynotconnected

32NCNotconnectedinternallynotconnected

33‐41GNDSupplyinputGround

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3.3 SIGNALDESCRIPTION

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Signalname:GND  Pinnumber(s):15,20‐26,28,30,33‐41

Thesepinsareusedforgroundingandtoimprovethethermalperformance.Theyshouldbe

connectedtoHostboardGNDnet.

Signalname:GPIO_X  Pinnumber(s):2‐6

ThesepinsareusedasgeneralpurposeIO.TheycanbeconfiguredviaSWAPIasinputoroutput

ports.IOvoltagelevelis3.3V.GPIOshavesourcecurrentcapabilityof3mAandsinkcurrentcapability

of6mA.

Signalname:ERASEPinnumber(s):7

Thispinisusedforproductiontestingpurposesonly.Shouldnotbeconnected.

Signalname:RX  Pinnumber(s):8

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ThispinisusedformoduleUARTinputsignal.Logiclevelis3.3V.IfUARTisusedforcommunication

thepinshouldbeconnectedtotheHostMCUserialTXport.

Signalname:TX  Pinnumber(s):9

ThispinisusedformoduleUARToutputsignal.Logiclevelis3.3V.IfUARTisusedforcommunication

thepinshouldbeconnectedtotheHostMCUserialRXport.

Signalname:USB_DN  Pinnumber(s):10

ThispinisusedasUSB_D‐deviceport.ItisadvisedtouseexternalESDprotectioncomponentif

connectedtouseraccessibleUSBconnector.

Signalname:USB_DP  Pinnumber(s):11

ThispinisusedasUSB_D+deviceport.ItisadvisedtouseexternalESDprotectioncomponentif

connectedtouseraccessibleUSBconnector.

Signalname:USB_DETPinnumber(s):12

ThispinisonlyusedforUSBconnectiondetection.ItisadvisedtouseexternalESDprotection

componentifconnectedtouseraccessibleUSBconnector.Currentisnotdrawnfromthisinputpin.

Signalname:VCC_3V3_OUT Pinnumber(s):13

Thispinisconnectedtointernalpowerregulatoroutput.Thepinisusedforproductiontestingandit

shouldnotbeused.

Signalname:MODULE_EN Pinnumber(s):14

DrivingthispintohighwillenabletheNUR‐05WL2module.Itisinternallyconnectedtoonboard

voltageregulator’senableinput.Thetriggerlevelis1.2Vandthereadermodulewillwakeupin50ms.

IftheexternalpowerswitchisusedtotoggleONandOFF,thispincanbeconnecteddirectlyto

VCC_3V6_IN.

Signalname:NC Pinnumber(s):16,31,32

Thesepinsareinternallynotconnected.

Signalname:VCC_3V6_IN Pinnumber(s):17

ThispinisusedforpowersupplyinputforNUR‐05Wmodule.Itisrecommendedtouse200µF(low

ESR)100nFand100pFcapacitorneartheVCC_3V6_INinputpintomaintainstableoperatingvoltage

forthereadermodule.

Signalname:RFU  Pinnumber(s):1,18,19

Thesepinsarereservedforfutureuse.Donotconnectthesepins.

Signalname:GND/RF_DIF  Pinnumber(s):29

ThispinisinternallyconnectedtoGND.ItisreservedforfutureuseassecondaryRFoutput.

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4 OEMDESIGNCONSIDERATIONS



4.1 RFOUTPUTANDANTENNAREQUIREMENTS



TheRFoutput/inputimpedanceis50ΩsothetraceleavingfromtheRF_OUTpinshallbekeptinthatsame

impedanceleveltoavoidreflectionsandmismatchoftheRFsignal.Toprovideanappropriateimpedance

matchplacethematchingcomponentsclosetoRF_OUTpin.Belowthereisthecircuitdiagramthatshallbe

utilizedinthefine‐tuningoftheimpedancematchandintheadditionalfiltering.



FromtheRFIDreadermodule’spointofviewitisimportantthattheusedantennahasalowVSWRvalue.

TheVSWRshallbebetterthan1.5:1inordertoavoiddecreaseinthesensitivityperformanceofthe

receiverbecauseoftheTXpowerreflectingbackfromtheantenna.IntheNUR‐05WL2module,thereisalso

anautomaticleakagecancellationsystemthatdecreasestheeffectofthereflectedsignal,anditalso

improvestheisolationoftheRXsignalfromtheTXsignal.Theautomaticleakagecancellationcanbe

triggeredusingSWAPIcommand.Forfurtherinformationontheleakagecancellationseethesection5.3.



4.2 POWERSUPPLY



TheNUR‐05WL2hasinternallinearpowerregulatorsforgettingbetterpowersupplynoiserejection.

HoweveritisstillimportanttosupplylownoiseandstablepowertotheNUR‐05WL2module.Thevoltage

rippleshouldbekeptunder200mVppanditisrecommendedtoaddaminimumof200µFlowESR,100nF

and100pFcapacitorsnexttotheVCC_3V6_INpin.



VCC_3V3_OUTisinternalregulatoroutputanditisusedforproductiontestingpurposes.Thispinshould

notbeusedtopowerexternalcircuits.

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4.3 USBDEVICEPORT



USB_DP,USB_DNandUSB_DETpinsareusedtoprovide2.0compliantUSBdeviceport.Itmustbe

rememberedthatonlyonecommunicationmethodcanbeusedtocommunicatewiththeNUR‐05WL2

moduleatthetime.ConnectingtheUSBwillautomaticallypreventcommunicationviaserialport.Itis

advisedtouseexternalESDprotectioncomponentifconnectedtouseraccessibleUSBconnector.Belowis

thetypicalschematicsusedwithNUR‐05WL2module.



TypicalschematicsforUSBconnectionwithESDprotection.



Usedcomponents.

RefDescriptionManufacturerPartcode

U15ESDprotectionSTMicroelectronicsUSBLC6‐2SC6

L37CommonmodechokeMurataDLW21SN371SQ2L

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5 RFPARAMETERS



5.1 TXLEVEL



Themaximumoutputpoweris+27dBm(500mW).Thepowercanbeadjustedby1dBsteps.Intotalthere

are19stepsmeaningtheminimumoutputpowervalueis+8dBmthatequalsto6mWofpower.When

usinghigheroutputpowerlevelstheantennasVSWRvaluebecomesmoreandmoreimportantfactor.High

outputpowercombinedtogetherwithantennawithpoorVSWRleadstoasituationwheresignificant

portionofthepowerisreflectedbacktothereceiver.



TXlevelPower:dBm/mWTXlevelPower:dBm/mW

027/5001017/50

126/3981116/40

225/3161215/32

324/2511314/25

423/2001413/20

522/1581512/16

621/1261611/13

720/1001710/10

819/79189/8

918/63198/6



5.2 RECEIVERSENSITIVITY



ThemaximumLBTsensitivityisof‐80dBm.Thereceivercanhandle+5dBmofpowerreflectingbackto

RF_OUTpinwithouthavingabigimpactontheperformance.Tolerancetoreflectingsignalcanbe

significantlyincreasedusingNUR‐05WL2leakagecancellationfunctionality.Thereceiverarchitectureuses

directconversionandithasanintegratedAGC(automaticgaincontroller).



5.3 LEAKAGECANCELLATION



Thedirectionalcoupleroftheinternalleakagecancellationcircuitryseparatestransmittedandreceived

signals.TuningthedirectionalcouplerincreasestheisolationbetweenTXandRXsignals.Youmaytunethe

directionalcouplerusingsoftware;thereisanAPIfunctionofitsownforthatpurpose.Noticethatthe

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tuningdoesnotmatchtheRF_OUTwithanantennasothegoodVSWR(returnloss)oftheantennaisan

essentialfactorofthegoodperformanceofthesystem.



5.4 MODULATION



ItispossibletouseASK(amplitudeshiftkeying)orPR‐ASK(phasereversedamplitudeshiftkeying)

modulation.TagsthatarecompliantwithISO18000‐6C(EPCC1G2)mustsupportbothofthese

modulations.ThePR‐ASKmodulationcantransferenergymoreefficientlytothetagbecauseRFenvelopeis

highmorethanitisusingASKmodulation.BydefaultthemodulationissettoPR‐ASK.



5.5 LINKFREQUENCY



Thelinkfrequencyaffectsthefrequencyoffsetoftagsreplyinrespecttoreader’scarrierwave.Forexample

whenusedlinkfrequencyis256kHz,tagwillreplyatthefrequencyofreadertransmissionfrequency±256

kHz.Theselectableparametersare160kHz,256kHzand320kHz.TagsthatarecompliantwithISO18000‐

6C(EPCC1G2)mustsupportalltheseparameters.Thelinkfrequencyalsoaffectstagtoreaderdatarate

whichiscalculatedbyformulabelow:



Tagtoreaderdatarate=(Linkfrequency/Millercoding)



Bydefaultthelinkfrequencyissetto256kHz.256kHzor320kHzsettingsmustbeusedwhenoperatingin

DRMmode.Itmustberememberedthatchangingtheseparametersmaycausereadertoviolateregionor

countryspecificradioregulations.Followingisaguidelineforhowtochoicerightsetting.Ifchannel

bandwidthis200kHzthan256kHzorlowerlinkfrequencyshouldbeused(forexampleinEU).When

operatinginaregionwhere500kHzchannelbandwidthisavailablealso320kHzlinkfrequencycanbe

used.



Spectralseparationcausedby256kHzlinkfrequencyandMillersub‐carrierencoding.

 



5.6 RXENCODING(MILLERENCODING)

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LikestatedabovetheMillersub‐carrierencodingschemeaffectsalsotagtoreaderdatarate.Inpracticethe

Millerencodingvalueaffectsthenumberofclockcyclesthattagusestomodulateonesymbol.Sowhen

usinghigherMillerencodingschemestagtoreaderdataratewillbeslowerbutatthesametimeitismore

robusttointerferences.Alsotagsresponsespectrumismoreconcentratedaroundthelinkfrequencywhen

usinghigherMillerschemes.Thisallowsthereceivertousenarrowerchannelfilters.Selectablevaluesare

M2,M4,M8orFM0.



ReceiverfiltersareoptimizedforM4andM8encodingschemes.WhenoperatingonDRMmodevalues4or

8shouldbeusedtooptimizetheperformance.BydefaultMiller4isused.Inadditiontomillerschemesalso

FM0encodingissupported.Inthiscaselinkfrequencydirectlydeterminesthetagtoreaderdatarate.



Tabledescribingdifferentdatarates.

Linkfrequency(kHz)RXencodingTagtoreaderdatarate(kbps)

160FM0160

160M280

160M440

160M820

256FM0256

256M2128

256M464

256M832

320FM0320

320M2160

320M480

320M840



5.7 REGION



TheNUR‐05WL2haspredefinedregionsettingsdefiningfrequencyandchannelsetsforoperatingunder

differentradioregulations.Globallytheregulationsvarydependingonthecountryorpartoftheworld.The

belowtableshowstheavailableoptionsfortheregionandtherespectivefrequencybandtheyuse.Note

thattheantennaalsoneedstobeworkingonthatsamefrequency.



Tableshowingpre‐programmedcountries/regions.

NumberCountry/regionFrequency/channelBW

0ETSI/Europe865.6–867.6MHz/200kHz

1FCC/North‐America902–928MHz/500kHz

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2People'sRepublicofChina920.5–924.5MHz/250kHz

3Malaysia919–923MHz/500kHz

4Brazil915–928MHz/500kHz

5Australia920–926MHz/500kHz

6NewZealand921.5–928MHz/500kHz

7Japan250mWLBT916.8–923.4MHz/200kHz

8Japan 916.8–920.4MHz/200kHz

9Custom840–960MHz



Ifyouwanttousecustomfrequenciesorhoptablesyouneedtofeedparameterdescribedbelow.



Tabledescribingcustomhoptableparameters.

ParameterValueDescription

Frequencyentry840000–960000[kHz]Definesthecenterfrequencyof

thefirsttransmitchannel.

Channelcount1‐100Definesthenumberoftransmit

channels

Channelspacing25*n[kHz]Definesthefrequencybetween

transmitchannels.

Channeltimeminimum100msDefinesthetimethatreadingis

ONatthesamechannel

Waittimemaximum1000msDefinesthetimethattransmitter

issilentbetweenfrequencyhops

Tari1=12.5us2=25usDefinestheTarivalue

LF160000,256000or

320000

Definesthemaximumlink

frequencythatisused

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6 READINGPARAMETERS

6.1 Q‐VALUE



TheQ‐valuedefinestheamountofopenresponseslotsthattagscanuseperoneinventoryround.Number

ofslotscanbecalculatedbyformula2Q.Itisadvisedtousetwiceasmuchslotscomparedtoamountoftags

thatyouhaveinyourreadersreadingfieldsimultaneously.Selectablevaluesare0–15andvalue0means

automaticQ‐valueadjustment.WhenQ=0isusedreaderwillautomaticallyincreasetheQ‐valuewhenlots

ofcollisionsarenoticedanddecreasedthevaluewhenthereareonlyfewcollisions.BydefaulttheQ‐value

issetto0.



TableindicatingtherelationbetweentheQ‐valueandthenumberofopenslotsperround.

Q‐valueslotsQ‐valueslots

0automatic8256

129512

24101024

38112048

416124096

532138192

6641416384

7128 1532768



6.2 SESSION



Therearefoursessionoptionswhichyoucanusewheninitializinginventoryround.Everysessionhastwo

targetstatesAandB.BydefaultGen2tagsareatstateAiftaghasnotbeenreadrecently.Whentagisread

itflipstostateBanddoesn’treplytoreadersquery.Thetablebelowdescribesthepersistenceoftag’sstate

machinewhenusingdifferentsessionvalues.Forexamplewhenusingsession0thetagwillcomebackto

stateAimmediatelywhentagpowerislost.Usuallytaglosesthepowerwhenreaderstopstheinventory

roundorchancesthechannel.PersistencewhentagpowerisONisnotdefinedbytheISO18000‐6Cwhen

usingsessionsettingsS0,S2andS3.Withsession1thetagwillkeepitstateover500msbutlessthan5s.

Withsessionvalues2and3tagswillkeepitstatesover2swhentagpowerislost.Timecanvarydepending

whattagICisused.



2013‐09‐27

NUR‐05WL2ImplementationGuidev1.1



Tableindicatingpersistencecharacteristicsofgen2tags.

FlagPersistence:tagpowerONPersistence:tagpowerOFF

S0indefinitenone

S1500ms<t<5s500ms<t<5s

S2indefinitet>2s

S3indefinitet>2s



BychangingthetargetsettingfromAtargettoBtargetreaderisabletoreadalsotagsthathasflippedits

statetoBstate.ThiswouldhappeniftagswouldhavebeenreadrecentlyusingSession12or3.NUR‐05WL2

modulealsosupportsdualtargetmode.Inthatmodereaderwillchangethetargetmodebetweeninventory

rounds.BydefaulttargetmodeAisused.



6.3 ROUNDS

Theroundssettingdefineshowmanyqueryroundsisdoneinsideoneinventoryround.Afterevery

inventoryroundthereaderwillsenddatatotheHost.Selectablevaluesare0–10.Zeromeaningautomatic

roundsadjustment.Theautomaticadjustmentdecidesaftereveryqueryroundwhetheranotherroundis

necessarybasedonthenumberofdatacollisions.Bydefaultroundssettingissetto0.Thissettingcanhelp

thereadertofindallthetagsthatareinthereadersreadingfieldwhenusingsession0.Becausetagsthat

arefoundinqueryround1doesn’treplayinthefollowingqueryrounds.Whenusingsession1/2/3this

doesnotmakeanysignificantdifferencebecausetagsthatarereadarequietanyway.



Tabledescribingrelationbetweeninventoryroundandqueryround.

Inventoryround

Round1Round2round3…Round10



6.4 SELECTINGTHERIGHTREADINGPARAMETERS



Oneapproachistotesthowmanytagsareinthereadersreadingfieldsimultaneously.Keepthereaderstill

atthepositionthatisasclosetorealreadingenvironmentaspossibleandseehowmanytagsarefound.

Basedonthatamountchooseyouropenslotnumbertobe1.5–2timeslarger(refertothesection6.1).If

readerwillfacemanydifferenttagpopulationsauto‐Qsettingwillbeagoodchoice.

2013‐09‐27

NUR‐05WL2ImplementationGuidev1.1



BesidesQ‐valueoneimportantparameterissession.Ingeneralitcouldbestatedthatifthesizeoftag

populationismeasuredinthousandsratherthaninhundredsitiswisetousesessions2or3.Becausethen

everytagwillbereadonlyonceandthatmakeslargetagpopulationmuchfasterandeasiertoread.When

usingsession2or3itisadvisedtouseMiller8encodingschemetoavoiddatatransfererrorsasmuchas

possible.Rounds1settingisalsoadvisedtobeusedwithsession1or2or3.Withsession0itmightbe

usefultousehigherroundsvaluethan1tobeabletofindalltheindividualtags.Bydefaultautomatic(0)

roundssettingisused.



Othersettingslikemodulation,linkfrequencyandRX‐encodinghasaminorimpacttothereadingspeedof

thereader.Whenoperatinginoptimalenvironmentfollowingwillapply:



RXencoding:FM0isfastestbutquitesensitivetointerferences/M8slowestbutveryrobust

Modulation:NoeffecttospeedbutPR‐ASKhasbetterrangewithsometags

Linkfrequency:320kHzisthefastest/160kHzistheslowest



Guidelinesettingstobeusedwithdifferenttagpopulations.

SettingsTagpopulationSimultaneouslyinthefield

Session0,autoQ,autoRounds 1–1001–100

Session1,autoQ,Rounds1100–1000under500

Session2/3,autoQ,Rounds1100–1000over500

Session2/3,autoQ,Rounds1over1000over500



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