Guard RFID Solutions TE GENERATOR OF LOW FREQUENCY FILED USED FOR DETECTION OF ACTIVE TAGS AT THE PORTAL User Manual

Guard RFID Solutions GENERATOR OF LOW FREQUENCY FILED USED FOR DETECTION OF ACTIVE TAGS AT THE PORTAL Users Manual

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TagExciterInstallationManual 07‐00051‐110

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TagExciter

InstallationManual

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PatientProtection

InfantSecurity

AssetManagement

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TagExciterInstallationManual 07‐00051‐110

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CopyrightsandTrademarks

Thismanualissubjecttocopyrightprotectionandallrightsarereserved.Undercopyrightlaws,the

manualmanynotbecopiedortranslated,inwholeorinpart,inanymannerorformat,withoutthe

writtenpermissionofGuardRFID™SolutionsInc.

AllsoftwareinwhichGuardRFID™SolutionsInc.oritsaffiliatesholdaproprietaryinterestisalsosubject

tocopyrightprotectionandallrightsarereserved.Nopartymayuseorcopysuchsoftware,inany

mannerorformat,excepttotheextentthatGuardRFID™SolutionsInc.,oranaffiliateofGuardRFID™

SolutionsInc.,grantsthemalicensetodoso.

Trademarks

GuardRFIDisaregisteredtrademarkofGuardRFID™Solutions,Inc.

MySQLisaregisteredtrademarkofOracleCorporation

WindowsisaregisteredtrademarkofMicrosoft

Revisions

Specificationsubjecttochangewithoutnotice.

ContactInformation

GuardRFIDSolutions,Inc.

#140–766ClivedenPl

Delta,BCCanadaV3M6C7

Tele:604.998.4018

Fax:604.524.4018

www.guardrfid.com

THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO

THE FOLLOWING TWO CONDITIONS: (1) THIS DEVICE MAY NOT CAUSE HARMFUL

INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED,

INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION.

NOTE: THE GRANTEE IS NOT RESPONSIBLE FOR ANY CHANGES OR MODIFICATIONS NOT

EXPRESSLY APPROVED BY THE PARTY RESPONSIBLE FOR COMPLIANCE. SUCH

MODIFICATIONS COULD VOID THE USER’S AUTHORITY TO OPERATE THE EQUIPMENT.

TagExciterInstallationManual 07‐00051‐110

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TagExciterInstallationManual 07‐00051‐110

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Contents

InstallingtheTagExciter ........................................................................................................................... 1

DetermineBestLocation ...................................................................................................................... 1

UsingTagExciterstoDetermineDirectionofTravelandRoomDiscrimination .................................. 5

ConnectingtheTagExciter ....................................................................................................................... 8

TagExciterInputs,Outputs,Indicators................................................................................................. 8

TagExciterPowerConnections............................................................................................................. 9

EnsuringCompliancewithRFIRulesandRegulations .......................................................................... 9

UsingtheTEDisable(DoorIn) ............................................................................................................10

TuningtheTagExciter............................................................................................................................. 11

UserInterface .....................................................................................................................................11

UserInterfaceMenuNavigation.........................................................................................................12

SettingtheProperTEFieldSize ..........................................................................................................14

SettingtheTagExciterID....................................................................................................................15

SettingtheRFSensitivity .................................................................................................................... 16

SettingtheModes...............................................................................................................................16

ReadingtheErrorCodes .....................................................................................................................17

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TagExciterInstallationManual 07‐00051‐110

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TagExciterInstallationManual 07‐00051‐110

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InstallingtheTagExciter

TagExcitershavethreemainfunctions.Theyareusedtotriggeranalarmatanegresspoint,pin

pointatag’slocation,and/orprovideareferencepointforwhenthetagchangesfloorsviaa

stairwellorelevator.TheTagExcitertransmitsa125KHzlowfrequencysignal(field)thatis

detectedbytheRFIDtag.DetectionrangeoftheTagExciterisadjustablefromtwoto18feet.

ThissectiondescribesthetwostepstoinstallingtheTagExciter:

 Determinethebestlocation

 Installdevice.

DetermineBestLocation

ThelocationoftheTagExciteriscriticaltotheproperoperationofthesystem.Anincorrectly

placedtagexcitermaycausenuisancealarmsfromnearbyareaswheretagsarenormallypresent,

orfailtodetectatagwhenexitingthroughadoorway.

NOTE:Only2TEsmaybeassociatedwithaTRCintheArgussoftwareorwithan

AtGuardControllerwhenconfiguringagate.

TheTagExciterfieldcanbevisualizedasalargespherewiththetagexciterinthecentreofthe

sphere.AstheTagExciterlevelisincreased,sodoesthesizeofthesphere.Thesphereranges

from2to19feetindiameteraccordingtothesetting.

Whenatagenterstheexciterfield,theTagExciterfieldisdetectedbythetagandeventsare

generatedbythisaction.Aneventmaybeanexitwarningoralarm.

FornetworkedapplicationsaTagExcitermaybeusedfortransitioningatagfromtheprevious

floorplantothepresentfloorplanwhenmovingverticallythroughabuilding,ortriggeracustom

eventsuchasdirectionoftravel(using2ormoretagexciters).Itshouldbeplacedinalocation

wheretheexciterfieldisonlygeneratedintheareaswhereyouwouldlikethetagtobedetected.

TagExciterInstallationManual 07‐00051‐110

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EnvironmentalandLocationConsiderations

 DonotmountTagExciterdirectlyonmetal–suchaselevatorcars.Use½inchnylonorplastic

spacersbetweentheTagExciterandthemetalsurface.MountingtheTagexciterdirectlyon

metalwilldetunethetransmittingantennas.

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 DonotmountTagExciterinalocationwherethereismetalbetweentheTagExciterandthe

intendedtagdetectionareasuchasontopofanelevatorcarorbehindametaldoor.RFdoes

notpropagatewellthroughthemetal,causingthetagtonotseetheexciterfield.

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 Considertrafficpatternsandlegitimate/acceptabletaglocationswheninstallingtheTagExciter.

Asanexample,thebestlocation(shownbelow)createsatagexciterfieldindirectproximityof

theprotecteddoor,whileatthesametimemaintainsasuitabledistancefromtheunprotected

doorsandroomsadjacenttothestairwellwheretagsareallowedtobelocated.

Metal

Tag

TagExciter

TagExciterInstallationManual 07‐00051‐110

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Unprotected

Door

Protected

Door

NOYES

Best

Location–

Exciterfield

doesnot

enterinto

adjacent

rooms

Poor

Location–

Exciterfield

crossestraffic

pathandenters

intoadjacent

room

NormalTrafficPattern

TagExciterInstallationManual 07‐00051‐110

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 InstallTagExciterinthelocationthatcreatesthesmallest,mostcompactfield.

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TagExciter

Ceiling

Notrecommended‐poorfloor

discrimination.TagExcitermay

bleedthroughupperfloor.

Betterlocation‐Approx8or9

feetfromfloor

PRO‐hiddenfromview

CON‐createsalargefield–can

bepronetoupperfloorbleed.

DroppedCeiling

BestlocationInchesabovethe

doorframe

PRO‐createsasmaller,more

compactfield.

PlenumSpace

Floor

Ideallocation–directly

adjacenttothelatchsideofthe

door

PRO‐‐createsthesmallest,

mostcompactfield.

CON‐morepronetodamageor

tampering‐maynotmeetthe

facilityaestheticrequirements.

TagExciterInstallationManual 07‐00051‐110

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UsingTagExciterstoDetermineDirectionofTravelandRoomDiscrimination

TwoormoreTagExcitersmaybeusedtodeterminedirectionoftravelthroughaportal,thereby

identifyingpreciselythelocationandthemomentintimeatagtransfersfromonezoneto

another.

Todeterminedirectionoftravelusingtagexciters,youmustunderstandhowtheArgussystem

treatszones.Duringsoftwareconfiguration,zonesaredefinedonafloorplanbyoutliningthe

zonewithaborder.Adjacentzonesaredefinedbydrawingzoneswithadjacentborders.TheTag

Exciters,identifiedbytheirserialnumbersarethendraggedontothefloorplanintheexact

locationstheyareinstalled.Inthesimplestexampletwotagexcitersareused.Onetagexciteris

installedinthefirstzoneandthesecondTagExciterinstalledinthesecondzonedirectlyadjacent

tothefirst.

Whenatagentersthefirsttagexciterfield,itslocationispinpointedattheperimeterofthefirst

zone.Asitcrossesovertothesecondzone,thetagwillbeimmediatelypinpointedatthe

perimeterofthesecondzoneattheexacttimeitcrossedover.

Multipletagexcitersmaybeplacedineitherzonetoaccommodatevariousfloorplan

configurations.Keepinmindafewbasicrules.

1. ThetagmustclearlyenteraTagExciterfieldinthefirstzonewithoutbeinginatagexciter

fieldlocatedinthesecondzone.

2. ThetagmustclearlyexitfromaTagExciterfieldinthesecondzonewithoutbeinginatag

exciterfieldlocatedinthefirstzone.

3. TagExciterfieldsineitherzonemayoverlapslightly

4. MorethanoneTagExcitermaybeusedineitherzonetocoverwideareasorpreventtags

fromslippingbyundetected.

Studytheexamplesbelowtodeterminethebesttagexciterlocationsforyourapplication.

ExampleA–determiningdirectionoftravelandzonetransferenceinacorridor.

TagExciterInstallationManual 07‐00051‐110

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ExampleBDeterminingdirectionoftravelandzonetransferencetoawidearea.

Notethetrafficpatternsinthisexample.Twotagexciterstunedforalargerfieldareinstalledon

onesideofthedoorwaytocapturetagsastheydispersetodifferentareasofthebuilding.Tag

Excitersarelocatedtoensurethetagentersintoonefieldandclearlytransitionstothefield(s)in

theadjacentzone.

TagExciterInstallationManual 07‐00051‐110

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ExampleCRoomDiscrimination

Asatagentersazone/roomthetagwillremainlocatedinthatzone/roomuntilitentersanother

zone/roomorcrossestheTagExciterintozone14.Note:ifatagleavesazone/roomanddoesnotenter

anotherroomorcrosstheTagExcitertozone14,thesystemcanrelocatethetaginthecorridorusing

RSSIdataobtainedfromtagreaderreceivers.

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TagExciterInstallationManual 07‐00051‐110

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ConnectingtheTagExciter

ThepurposeofthissectionistooutlinethegeneraloperationandwiringoftheTagExciter(TE).

TagExcitershavethreemainfunctions.Theyareusedtotriggeranalarmatanegresspoint,pin

pointatag’slocation,and/orprovideareferencepointforwhenthetagchangesfloorsviaa

stairwellorelevator.TheTagExcitertransmitsa125KHzlowfrequencysignal(field)thatis

detectedbytheRFIDtag.DetectionrangeoftheTagExciterisadjustablefromtwoto18feet.

TagExciterInputs,Outputs,Indicators

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TagExciterInputsandAdjustmentPoints

InputsDescription

Power(12VDCInput)12VDCsupply(11.5VMin,14VMax)

DoorInDisablesLFfieldwhenpinsareshorted

Adjustments

ResetKeyResetsTEprocessor,customsettingsaremaintained

TankCircuitTuningLFAntennatuningDONOTADJUST

TestKeyFeedbackmodeforLFfieldadjustments

SELkeySelectsbetweenLF/ID/RF/MODadjustmentmodes

EnterKeypresstoentervaluewhenadjusting

INCKeyincrementsvalueduringadjustments

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TagExciterInstallationManual 07‐00051‐110

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Indicators OffOn Flashing

LED5RedPowerFaultLED. NormalOver/undervoltageN/A

AlarmLEDRedLED,TEinundesirable

conditionwhenflashingNormalN/ATEError‐CheckError

codedisplay

FieldLEDYellowLED LFFieldoffNormal‐LFfieldonRecalibratingfieldsize

CommLEDGreenLED Noinput

voltage

Networkcommunication

established

Poweron,nonetwork

communication(Normal

operationfor@Guard)

LFLEDLitwheninLFadjustmode NormalInLFadjustmodeN/A

IDLED LitwheninIDadjustmode NormalInIDadjustmodeN/A

RFLEDUHFSensitivitySetting

(Notused)NormalInRFadjustmodeN/A

MODLEDLitwhenadjustingMODE

featuresNormalInModeselectmodeN/A

7Seg.LED

Readout

Numericalindicator

showingstatusorlevelNormalIndicatescurrentconditionN/A



TagExciterPowerConnections

TheTEinputvoltageis12VDCandmaybepoweredbyacentralpowersupplyoraPoESplitter

andaPoEnetworkswitch.NotethattheTEconnectstothenetworkusinga433MHzlinktothe

TRCanddoesnotrequireaTCP/IPconnection.PoEPoweredTEsdonotusethedatacomponent

ofthePoEswitch.

WhenpoweringtheTEwithaPoESwitch,ensuretousetherecommendedPoESplitter

(GuardRFIDP/N61‐24002).PoEvoltageis48VDCfromtheswitchandneedstobe

convertedto12VDCtopreventdamagetotheTRC.

ConnecttheTEto12VDC/1ApowersourceeitherfromthePoESplitterora12VDCcentralpower

supplyasshownbelow.PowersupplyvoltagefortheTEmustnotexceed14VDC.



EnsuringCompliancewithRFIRulesandRegulations

InordertoensurecompliancewithrelevantRFIrulesandregulations,thecableusedtosupply

powerforTagExcitermusthaveferritesuppressorattached.Theferritesuppressorissupplied

withTagExciterandshouldbeclampedontothepowercableascloseaspossibletoTagExciter

enclosure.

ThepartnumberofferritesuppressorisBF1835,manufacturedbyAPIDelevanInc.Any

equivalentferritesuppressorcanbeused.

TagExciterInstallationManual 07‐00051‐110

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UsingtheTEDisable(DoorIn)

TheTELFfieldcanbedisabledbyaddingaswitchtotheDoorIninputoftheTagExciter.This

featurecanbeusedwhenyourequirethefieldtobeswitchedonandoffquickly.The

examplebelowillustratesconnectiontoaN/Cdoorswitch(doorclosed/contactclosed).

TagExciterInstallationManual 07‐00051‐110

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TuningtheTagExciter

ThepurposeofthissectionistoshowhowtotunetheTagExciterforoptimalcoverageinyour

application.

TheTagExciterfieldcanbevisualizedasalargespherewiththetagexciterinthecentreofthe

sphere.AstheTagExciterlevelisincreased,soisthesizeofthesphere.Thesphererangesfrom2

to18feetindiameteraccordingtothesetting.

AdjustmentsforthetagexciterincludeLFFieldsize,ChangingtheIDnumber(electronicserial

numbertransmittedinthebeacon),RFsensitivity(notfieldadjustable),andmodesettings

UserInterface

TheTEUserinterfaceallowsyouaccesstotheTEmenuandadjustmenttools.



TagExciterInstallationManual 07‐00051‐110

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UserInterfaceMenuNavigation

Theuserinterfaceisaccessedbypressinganykey.Exittheuserinterfacebypressingandholding

theSELandENTkeys,orifthereisnokeypressesfor10minutestheuserinterfaceisturnedoff

automatically.

Theuserinterfacenavigationchartisshownbelow.

TagExciterInstallationManual 07‐00051‐110



TosettheLFfieldsize

 Pressanykeytoactivatetheuserinterface

 ObservetheLFLEDislit.

 PresstheINCkeyuntilthedisplayreadsthedesiredfieldsize.

 PressENTtosavetheselectedvalueintoTEmemory



Held SEL

key SEL key SEL keyMode N

SEL key

User interface off

LF Setting

Any Key

SEL key

ID setting

SEL key

RF Setting

SEL key

Mode Root Menu

SEL key

Error Code Display

SEL key

Mode 0 Mode 1

Held

Sel Ke

Held Sel

&Ent

TE Reset UI

Timeout General Keys:

To activate the user interface – press any key.

To turn the user interface off – press and hold SEL and ENT

keys

Enter/Exit Mode settings - Press & Hold SEL Key.

Changing LF, ID, and RF Settings:

INC key – Increments setting.

ENT key – Saves setting.

Changing Mode Setting:

INC – Toggles setting (Decimal Point of 7-Seg display on/off)

ENT key – Saves setting.

Test Mode:

Test – Toggles test mode on/off. Test LED indicates when test

mode is active.

TagExciterInstallationManual 07‐00051‐110



ThistableprovidesTagExcitercurrentconsumption

andLFfieldsizeforeachof16possiblesettings.

Thesemeasurementsaredoneunderthefollowingconditions:

PowerSupply12.3VDC

Tagused:PT1

LFAntenna:

TagLFantennaisorientedin

parallelwithoneofthecoilsofTag

Exciter



LFFieldSettings

Setting

Current

consumption

(A)

Range(feet)

00.062.0±0.5

10.063.5±0.5

20.095.0±1

30.136.0±1.5

40.087.0±1.5

50.098.0±2.0

60.1110.0±2.0

70.1711.0±2.0

80.2512.0±2.5

90.3313.0±2.5

A0.4214.0±2.5

B0.5015.0±3.0

C0.5216.0±3.5

D0.5817.0±3.5

E0.6818.0±4.0

F0.8519.0±4.0

SettingtheProperTEFieldSize

ThereareothermanyusesfortheTEsuchaspinpointinglocationofthetag,room

discriminationordeterminingdirectionoftravel.TheTEfieldisadjustedinthesamemanner

forallapplications.TestingtheTEfieldsizeandadjustingforthedesireddetectionareais

criticaltoproperoperationofsomesystems.CaremustbetakenwhenadjustingtheTEfield

sizetoensureitwilldetectatagexitingthroughadoorbutnotexceedinglylargesothatit

intrudesonadjoiningroomsorareaswhereyoudonotwanttagstobedetected.

ThissectionassumesthattheTEisusedatadoortodetectatagasitpassesthroughthe

doorway.

TagExciterInstallationManual 07‐00051‐110

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TotestandcoarseadjustthesizeoftheLFfield

 PresstheTESTkey

 Holdingataginfrontofyou,approachthedoorwaywithatagatwaistlevel,theTEwill

beepwhenthetagentersthefield

 UsingtheLFfieldadjustmentinstructionsabove,adjusttheTEfieldsizetothedesired

level,ensuringthetagisdetectedeverytime,anddoesnotdetecttagsinunwanted

areas.

 Holdingthetagoneortwoinchesfromthefloor,approachthedoorwayensuringtheTE

beepswhenthetagpassesthroughthedoorway

 PresstheTESTkeytorevertbacktonormaloperation(after10minutesofnokey

presses,TESTmodeisautomaticallyturnedoff



Notethatthetagorientationmayhaveaneffectontheapparentsizeofthefield.Insidethe

tagisacoilantenna.WhenthisantennaisparalleltooneofthecoilantennasintheTE,the

fieldappearstobelargerthanifthetwocoilsareperpendicular.Thevariationindistance

variesfromonefoottofourfeetforlargerfields.Ensurethatthetagisdetectedinall

orientations.



TestandfineadjustthesizeoftheLFfield

Toperformthistestandadjustmentprocedure,thegatemustbeconfiguredintheArgus

ConfigurationManager,andakeypadmustbeassociatedtothegateyouaretesting.

 Holdingataginfrontofyou,withthedoorclosed,approachthedoorwaywithatagat

waistlevel,thekeypadwillbeepwhenthetagentersthefield

 UsingtheLFfieldadjustmentinstructionsabove,adjusttheTEfieldsizetothedesired

level,ensuringthetagisdetectedeverytime,anddoesnotdetecttagsinunwanted

areas.

 Holdingthetagoneortwoinchesfromthefloor,approachthedoorwayensuringthe

keypadbeepswhenthetagpassesthroughthedoorway

SettingtheTagExciterID

EachTEisprogrammedwithauniqueIDnumberwhichisalsotheserialnumberoftheTE.

TheTEtransmitsabeaconmessagetotheTRCthatcontainstaginfieldinformation,

Firmwarerevisioninformationandtheserialnumber.Thetransmittedserialnumberis

truncated,strippingoffthemostsignificant13bitsoftheID.Duetothemostsignificantbits

beingtruncatedfromtheIDthereisapossibilityoftwoTEstotransmitthesameID.To

resolvethisissue,theleastsignificant4bitsoftheTEmaybechangedinthefieldwiththetag

exciterIDsetting.

TagExciterInstallationManual 07‐00051‐110

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IftwoTEsaretransmittingduplicateIdstheleastsignificant4bitsoftheIDnumbercanbe

changed.

TochangethetransmittedID

 Pressanykeytoactivatetheuserinterface

 PresstheSELkeytwice,oruntiltheIDLEDislit

 PresstheINCkeyuntilthereadoutdisplaysthedesiredleastsignificantdigitoftheID.

(i.e.003A40wouldbechangedto003A41iftheIDwaschangedto1.

 PresstheSELkeytoselecttheleastsignificantdigit

 PresstheENTkeytosavetheselectedvalueinTEmemory

SettingtheRFSensitivity

RFsensitivityispre‐programmedduringmanufactureandthissettingisnotused.

SettingtheModes

Therearethreemodesthatareprogrammable,exciterfieldon/off,UHFboardpresence,and

endoflineresistorpresence(atDoorInconnector).Thedefaultsettingsareexciterfieldon,

UHFboardpresent,andnoendoflineresistorrequired.Thesesettingsarenotnormally

adjusted.

EnteringMODEsettingconfiguration

 Pressanykeytoactivatetheuserinterface

 PresstheSELkey3timesoruntiltheMODELEDislit–thedisplaywillgoblank

 PressandHOLDtheSELkeyoncemoreuntil2beepsareheard–thedisplaywillshow

“0”whenthekeyisreleased

 TheTEisnowinMODEsettingconfiguration

 PressSELtoscrollbetweenmode0,1and2



SettingtheTEfieldon/off(MODE“0”)

Default–TEfieldON



 Pressselectwhileinmodesettingconfigurationuntilthereadoutreads“0”

 PresstheINCkeytotogglethefieldonandoff,thefieldisonwhenthedecimalpoint

afterthedisplayislit,offwhenthedecimalisoff(theMODLEDwillflashwhenthe

settingisbeingadjusted)

 PresstheENTkeytosavetheselectedvalueinTEmemory(theMODLEDwillstop

flashing)



SettingtheTEtoactivatetheUHFradio(MODE“1”)

TagExciterInstallationManual 07‐00051‐110

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Default–Radioactivated–(Note:theAtGuardsystemdoesnothavearadioboardon

theTEandwillshipdefaultedas“radiodeactivated”)

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 Pressselectwhileinmodesettingconfigurationuntilthereadoutreads“1”

 PresstheINCkeytotoggleactivate/deactivatetheradio.Theradioisactivatedwhen

thedecimalpointafterthedisplayislit,deactivatedwhenthedecimalisoff(theMOD

LEDwillflashwhenthesettingisbeingadjusted)

 PresstheENTkeytosavetheselectedvalueinTEmemory(theMODLEDwillstop

flashing)

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SettingtheTEtodetectEOL(endofline)Resistors(MODE“2”)

Default–EOLresistorsnotinstalled

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 Pressselectwhileinmodesettingconfigurationuntilthereadoutreads“2”

 PresstheINCkeytotoggledetect/ignoreEOLresistors.EOLresistorsaredetectedwhen

thedecimalpointafterthedisplayislit,ignoredwhenthedecimalisoff(theMOD

LEDwillflashwhenthesettingisbeingadjusted)

 PresstheENTkeytosavetheselectedvalueinTEmemory(theMODLEDwillstop

flashing)

ReadingtheErrorCodes

IftheAlarmLEDisflashingtheTEhasdetectedanerror.ErrorcodesarereadfromtheTEdisplay

Toreadtheerrorcodes

 Pressanykeytoactivatetheuserinterface

 PresstheSELkeyfourtimes,oruntiltheERRORLEDislit

 Readthedisplay:

0–Noerror

1–Caseopen/tamper.Tosimulatethecoveronholdyourhandatthelevelofthe

cover,nearthecentreoftheTEandthe“1”errorshouldstop.Sincethecaseisopen

whentroubleshooting,thiserrorisalwaysdisplayed.Youmustsimulatethecoveron

tocontinue.

2–Radionotdetected.Theradioboardisfaultyornotinstalled(Note:IntheAtGuard

systemthereisnoradioboard)

3–Inputpowertoolow.Checktheinputvoltage;itshouldbe12–13.6VDC

4–Inputpowertoohigh.Checktheinputvoltage;itshouldbe12–13.6VDC

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Guard RFID Solutions TE GENERATOR OF LOW FREQUENCY FILED USED FOR DETECTION OF ACTIVE TAGS AT THE PORTAL User Manual

Guard RFID Solutions GENERATOR OF LOW FREQUENCY FILED USED FOR DETECTION OF ACTIVE TAGS AT THE PORTAL Users Manual

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