MMR SB1000 Specifications
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41 Daggett Drive, San Jose, CA 95134
SB1000DigitalSeebeckEffectController
Installation&OperatorsGuide
RevE‐July2014
ThisdocumentoutlinestheinstallationandsetupoftheMMRSB1000DigitalSeebeckController.
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CONTENTS
AbouttheSB1000DigitalSeebeckController
Specifications3
SystemRequirements3
EnvironmentalandSafety3
HardwareInstallation
Installation4
ChangingPortNumbersinWindows5
Front/RearPanelInterface6
GettingStarted7
GeneralOperation
MainSoftwareSuiteInterfaceandSpooler8
TheoryofOperation9
StagePreparation13
SamplePreparation14
ExperimentSetup15
SeebeckSoftwareLayout16
SeebeckSoftware17
SeebeckStatisticsView18
CommunicationsProtocol19
Troubleshooting
Troubleshooting21
AdditionalInformation
HelpDeskandMMRContactInformation22
DeclarationofConformity23
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AbouttheSB1000DigitalSeebeckController
Specifications
TheSB1000SeebeckEffectcontrollerisbuiltonandintendedtoreplacetheprovenSB100SeebeckController
previouslyofferedbyMMRTechnologies.SeePage9fortheTheoryofOperation.Thisdeviceprovidesaccurate
ThermoElectricvoltagereadingsfromanMMRSeebeckStageandRefrigeratorassembly.Thesedevicesare
intendedforusewithMMRRefrigeratorsonly.
Voltage:115VAC‐220VAC50/60Hz(DualVoltage
)
PowerConsumption:30W
HeaterPower:0‐1W
Communications:RS232orUSB1.0(Seecommunicationsprotocol)
StandaloneOperation:Yes
Weight:5Lbs
Dimensions:8.5"(W)x1.5"(H)x14.25"(D)
Environmental:Indooruseonly,5C‐40CTemperature,2000MMaxAltitude,80%Humidityfor
temperaturesupto31°Cdecreasinglinearlyto50%Relhumidityat40°C.
System Requirements
TheSB1000SeebeckControllerisdesignedforusewith'MMRTechnologiesSuite'whichmustbeinstalledpriorto
usingthisdevice.Forcustomcontrolofthisdeviceseepage19.PleasenotethatMMRmaynotsupportcustom
configurations,andinsomecasesthewarrantymaybevoid.
OperatingSystem:Windows2000,WindowsXP,Windows7,Windows8
Hardware:32BIT/64BITINTELorAMDProcessor
MemoryRAM:2GB
MemoryHardDisk:1GB
PeripheralInterface:1xRS232SerialorUSB1.0.
MacOS:NotSupported
Linux/Unix:NotSupported
Environmental and Safety
TheSB1000SeebeckEffectcontrollerisbuiltonandintendedtoreplacetheprovenSB100Seebeck
ControllerpreviouslyofferedbyMMRTechnologies.Pleaseobservethefollowingsafetywarnings:do
notopentheenclosure,donotoperateonanyvoltageotherthanspecified,donotattemptto
serviceormodifytheequipment,donotoperateinwet/damplocations.Warning,electricalshock,
injuryordeathmayoccurifthedeviceisopenedortheearthmodified.Useonlythecablessupplied
withthedeviceandensureaproperGroundispresent.TheSB1000shouldonlybeusedasintended
andshouldnotbeusedforanyotherpurpose.Anynon‐intendedusecouldcausefire,lossoflife,loss
ofequipment,andbodilyharm.Userassumesallriskshouldtheequipmentbemisused,modified,or
usedinanunintendedmanner.ContactMMRforservicerequirements.
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HardwareInstallation
Installation
BeforeproceedingpleaseensuretheMMRTechnologiesSoftwareSuiteisinstalledandthefollowingitemsare
present:
1xSB1000SeebeckController
1xK2000TemperatureController(IfTemperaturecontrolisrequired)
1xACPowerCable
1xRS232DB9SerialCable
1xUSB3FTCable
1xUserManualandSoftware/DriverInstallationCD
1x4FTRefrigeratorRibbonCable
1xMMR4‐WireKelvinConnectionBreakoutBoard
1xSB1000‐K2000LinkCable
PleaseconnecttheSB1000asshownbelow.DonotconnectboththeRS232SerialcableandUSBcable
simultaneously,theseareprovidedasanoptionshouldyoubeshortofsparePCports.
OnceconnectedandwiththePCRunning,youmaynowpoweruptheSB1000device.PleasefirstensuretheAC
Powerswitchattherearoftheunitis'ON'(seepage6forfurtherinformation).Pressthefrontbuttonlabeled
'Power'toactivatetheunit.IftheUSBcablewasused,WindowswillautomaticallyassignaCommPort.Thismust
beidentifiedand,ifnecessary,changedtobeintherangeof1‐16(Seepage5orcontactyoursystem
administrator).PleasenotedowntheassignedCommPortNumberasthiswillberequiredtocommunicatewith
thedevice.
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HardwareInstallation
Changing Port Numbers in Windows
(Note:Administratoraccessmaybeneeded,contactyourITdepartment)
1/.OpenDeviceManager.
(ControlPanel‐>DeviceManager)
2/.SelectthecorrespondingSerialConverter
Device.
(RightClick‐>LeftClickProperties)
3/.Clickonthe'PortSettings'Tab.
4/.ClickAdvanced.
5/.SelectaCommPortbetween1‐16thatis
notin‐usebyotherhardware.ClickOK.
(Note:Onsomecomputersyoumayneedto
disconnect(unplug)andreconnectthedevice
tomakethechangespermanent)
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HardwareInstallation
Front / Rear Panel Interface
Note:ThePowerbuttonmustbeheldfor3secondstopowerdowntheunit.
*Replacefusewith3.15ASlowBlow(IEC127‐2orsimilar)ONLY.
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HardwareInstallation
Getting Started
Step1‐Deviceportsareeasilyverifiedthroughthewelcomescreenabove.SelecttheportnumbertheSB1000
SeebeckControllerisconnectedto(shownaspresentnexttotheSB1000)andpress'Poll'.IftheSB1000is
connectedtothatportandpoweredon,itwillrespondwithaDevicenameandVersionnumber.
Iftheportnumberisnotvisibletryrefreshingtheportlistbyclickingtherefreshiconabovethe"Poll''buttons.If
thisdoesnotresolvetheissuetryrestartingthecomputer.Forfurtherassistancecontactyoursystemadministrator
andfinally,theMMRHelpdesk(SeecontactinformationonPage27).
Step2‐Select'SeebeckExperiment.'ThiswillloadtheSeebeckexperimentmodule.IfthereisnoK2000present,
deselect"K2000'underhardware.ThiswilldisabletemperaturecontrolforallSeebeckexperiments.Errorswill
occurifK2000remainsselectedwhennotpresent.
Step3‐Press'Begin
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GeneralOperation
Main Interface
ThemaininterfaceoftheMMRTechnologiesSuiteisshownabove.Thisistheprimarycontainerforall
MMRapplications.TheapplicableitemsfortheSB1000TemperatureControllerareshownabove.
SB1000 Spooler
[MainSuite‐>SB1000‐>ShowSpooler]
Thiswindowshowsthecommunicationsqueueandresponsefromtheassociateddevice;inthiscase
theSB1000SeebeckController.Troubleshootingistheprimaryuseforthiswindow.Howeverclicking
"Send"isashortcuttothe‘MainCommunicationsConsole'outlinedintheSoftwareInstallationGuide.
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GeneralOperation
Theory of Operation
Thesystemdescribedbelowmeasuresthethermovoltage(SeebeckVoltage)ofmetalsandsemiconductors.
It
alsoprovidestheuserwiththeopportunitytostudythetemperaturedependenceoftheSeebeckVoltagefor
different
materials.BelowisapictureoftheSeebeckStagewhichisattachedtothecoldstageoftheMMR
refrigerator.
LowTemperatureKaptonStageHighTemperatureCeramicStage
TheoryofOperation
TheSeebeckStagehastwopairsofthermocouples:oneofcopperandametalwithknown
properties,andtheotherpairofcopperandametalwithpropertiestobedetermined.Oneofthe
junctionsineachpairisconsideredareferencejunction,andtheothertheworkingortemperature
modulatedjunction.TheStagealsohasacomputercontrolledheater,locatedclosetotheworking
junctionsofeachpair,andremotefromthereferencejunctions.Thisheateriscontrolledbythe
MMRProgrammableSeebeckControllerSB1000.TheSeebeckstageisattachedtothecoldstage
ofanMMRrefrigerator,whichprovidesagivenstabletemperatureforthemeasurement.The
MMRColdstageiscontrolledbytheMMRK20000DigitalTemperatureController.TheSeebeck
Stagehastwooutputs:V1andV2,whicharemonitoredbyacomputerthroughtheSB1000.
Theprincipleofoperationisthefollowing:assumethatallfourthermocouplesareatthesame
temperature.ThenV1andV2willbezerobecauseeachmemberofeachpairofthermocouples
compensatesthevoltageoftheother.Ifpowerisappliedtotheheater,thenatemperature
differencewillbecreatedbetweentheworkingandthereferencejunctionsbecausetheyare
locatedatdifferentdistancesfromtheheater.Asaresult,thermovoltageswillbegeneratedin
eachpairgivingnonzerooutputvoltagesVIandV2.Thesearegivenby:
(1).V1=ε1∆T(P)and
(2).V2=ε2∆T(P)
Whereε1andε2arethespecificthermo‐voltagesofthesampleandknownthermocouples
respectively,andΔT(P)isthetemperaturedifferencebetweentheworkingandthereference
junctionscreatedbyapplyingpower(P)tothecomputercontrolledheater.Weexpect,thatthe
temperaturedifference ΔT(P)willbethesameforbothpairsbecausethestagehasasymmetrical
shape.Thevalueofthespecificthermo‐voltageoftheunknownjunctionisthen:
(3).ε1=ε2V1/V2
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GeneralOperation
However,oneshoulduseasmalltemperaturedeviationΔTinordertoobtainrepresentativedata
inthetemperaturedomain.Therefore,thevaluesofV1andV2willalsobesmall.Becauseofthis,
adirectmeasurementwillnotgivehighaccuracybecauseofinstrumentalerrors,andany
undesiredthermo‐voltageeffectsfromwires,connectors,etc.Theseeffectscancreatesubstantial
offsetvoltageswhich,inadditiontothetemperaturedriftsandoffsetsoftheinputamplifiers,can
contributeamajorsourceofmeasurementerror.Thesecanbeeliminated,however,bytaking
measurementsattwodifferenttemperatureoffsets,usingtwodifferentpowersettings,andthen
usingthedifferencesignal.Weshowthisasfollows;therealvaluesofV1andV2acquiredbythe
SB1000aregivenby:
(4).V1(P1)=ε1∆T(P1)+∆V1and
(5).V2(P2)=ε2∆T(P2)+∆V2
WhereΔV1andΔV2aretheinstrumentandextraneousthermaloffsetvoltagesdiscussedabove,
andP1isthepowerappliedtotheheateratthefirstmeasurementpoint.Now,iftheheaterpower
ischangedtoanewvalueP2,weobtainasecondpairofvaluesforV1andV2:
(6).V1(P2)=ε1∆T(P2)+∆V1and
(7).V2(P2)=ε2∆T(P2)+∆V2
TheoffsetvoltagesΔV1andΔV2canbeassumedtobeindependentofpowerP,becauseonlythe
temperatureintheimmediateneighborhoodofthereferenceandsamplejunctionschange,not
thosewheretheseotheroffsetvoltagesoriginate.
Subtractingequations(6)and(7)from(4)and(5),respectively,weobtainthetruevalueofε1from
thefollowing:
(8).ε1=ε2{V1(P1)‐V1(P2)}/{(V2(P1)‐V2(P2)}
(8)doesnotincludeΔV1andΔV2.Theoffsetshavebeenremoved.
Certainhardwareandsoftwareprecautionshavealsobeenimplementedtoeliminateanypossible
electricalcouplingbetweentheheaterandmeasurementcircuitsaswell.
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GeneralOperation
MeasurementProcess:(Datacollectedingreenareas)
ThepowerortheheaterP(t)ischangedfromzerotolevelP.V1andV2areplottedschematically
toshowthecorrespondingchangesofthethermo‐voltages,asthetemperatureoftheworking
junctionschange.Thegreenareasshowthetimeintervalsduringwhichreadingsaretaken.The
averagevalueofV1andV2forpowerlevels0andPareusedattheendofeveryperiodto
calculatethespecificthermo‐voltageofthesample.Theinitialandoperatingtimedelaysprovide
timeforthesystemtostabilizethermallybeforetakingthedata.
TheMMRSeebeckSystemallowsthetemperatureoftheMMRColdStageandattachedSeebeck
Stagetobecontrolledoverawidetemperaturerange.Onecanthusstudythetemperature
dependenceofthespecificthermovoltageofthesamplesbyrepeatingthemeasurementsata
seriesoftemperatures.TheSeebeckSystemallowsthistobedoneautomatically.
Definitions.
Inthefollowing,varioustermsusedinthisManualandintheoperationoftheSystemaredefined.
1.Measurementpoint.ThesettemperaturefortheSeebeckstageprovidedbytheMMRCold
Stage.Differentmeasurementpointsareusedinordertostudythetemperaturedependenceof
thespecificthermo‐voltage.
2.Experiment.Theprocessthatincludesasequenceofmeasurementpoints;startingfromthe
InitialTemperatureandfinishingwiththeFinalTemperature.Includingdataacquisitionatevery
measurementpoint,calculationandfinalpresentationoftheresults.
3.InitialandFinalTemperatures.Thesetemperaturessettherangeofthedataacquisition
process.IftheInitialTemperatureislessthantheFinalTemperature,thenthesamplewillbe
heatedduringdatacollection.IftheFinalTemperatureislower,thenthesamplewillbecooled.
TheInitialandFinalTemperaturesarealwaysdisplayedduringtheexperiment.Thepermitted
rangeofthesettingsforthesetemperaturesdependsonthetypeofThermalStageused.Referto
thecorrespondingdatasheets.
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GeneralOperation
4.Stand‐byTemperature.ThetemperaturetowhichtheSeekbeckstageistobesetafterthe
experimentiscompleted.
5.CurrentTemperature.Theactual,presenttemperatureoftheColdStage.
6.TargetTemperature.Thetemperatureatwhichthepresentactivityofthesystemistargeted.Itcan
betheInitialTemperature,theMeasurementpointTemperature,ortheStandbyTemperature.The
temperaturesettingprocessiscompletewhentheCurrentTemperatureisequaltotheTarget
Temperature.
7.CurrentPower.ThepowerbeingappliedpresentlytotheMMRColdStagebythe‘K2000MMR
TemperatureController.'
8.TemperatureStep.Thedifferencebetweentwosuccessivemeasurementpoints.
9.SweepSpeed(RampRate).Therateatwhichthetemperatureischangedfromone
measurementpointtothenext.
10.ModulationPower.ThevalueofthepowerappliedtotheSeebeckstageheatertoproducea
temperaturegradientacrossthesamples.
11.InitialTimeDelay.ThewaitingperiodfromthetimetheColdStagereachesthemeasurement
temperature,untilthesystemtakesthefirstsetofreadings.Thisdelayisneededtoallowthe
SeebeckStagetoreachequilibriumwiththeColdStage.
12.OperatingTimeDelay.ThewaitingperiodfromthetimetheSeebeckStageheateristurned
on,untilthesecondsetofreadingsaretaken.Thisallowsasteadystatetobereachedacrossthe
SeebeckStage.
13.ReferenceThermo‐Voltage.Thespecificthermovoltage(SeebeckCoefficient)oftheknown
junction;usedintheSeebeckStageasareference.Sincethisparameterchangeswith
temperature,thedataacquisitionsoftwareincludesafilewithalook‐uptabletoprovidethevalue
whichcorrespondstothatforthesettemperature.TheStandardMMRSeebeckSystemissupplied
withalookuptableforConstantan(asthereferencematerial)relativetocopperalongwith
ConstantanrelativetoPdAg.
14.AveragingParameter.Theparameterthatdefinesthenumberofacquireddatareadingsmade
duringthemeasurementtimeinterval,whicharesubsequentlyaveragedatonemeasurement
point.Theparametercanvaryfrom0to7.Theactualnumberofdatareadingsiscalculatedasa
correspondingpowerof2,soaparameter0means2°,oronereading,whileaparameter7means
27,or128readings.MMRRecommendsasettingof'2'formostexperiments.
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GeneralOperation
Stage Preparation
1.StageInstallation.
1.1.RemoveaSeebeckStagefromthepackage.
1.2.PutathinlayerofthermalgreaseonthelargeCopperplate(underside).
1.3.UnlocktheZIFconnector(ifpresent)onthepre‐amplifierboardinthevacuumchamber.Using
thumbsoneachsideoftheconnecter,inserttheSeebeckstagefully.
1.4.AffixtheSeebeckStagetoTheColdStagebythespringfasteners.Beextremelycareful!Donot
applyanydownwardforceontherefrigerator.Usetweezerstoadjustthefastenersduringinstallation.
YoucanmovetheSeebeckStagebackwardsandforwardsbyacoupleofmillimeterstogetthebest
location.
1.5.LocktheZIFconnector(ifpresent).
1.6.Installthecoveronthevacuumchamber.
2.ConnecttheRibboncablefromtheChambertotheSB1000.IfaK2000ispresentfortemperature
control,ensuretheLinkRibbonCableisinstalledfromtheSB1000totheK2000.
3.Ifyouaregoingtousethesystemattemperaturesbelowambient,youshouldalsoinstallall
systemcomponentsrequiredforcoolingaccordingtotheMMRRefrigeratorsManual.
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GeneralOperation
Sample Preparation
TheMMRSeebeckSystemcanbeusedformeasurementoftheSeebeckcoefficientofawiderangeof
differentconductivesubstances,metals,organicconductors,andsemiconductors.Samplesshouldbein
theformofathinstriporwiretobeinstalledontheSeebeckStage.Theactualdimensionsandthe
shapeofsamplesarenotcritical,butshouldbeconsiderablysmallerthantheSeebeckstageitself.We
recommendthatthewidthofthesamplesnotexceed1mm(40mils),andthelength5mm(200mils).
Forproperinstallationofthesamples,goodelectricalandthermalcontactsmustbeprovidedatboth
endsofthesampletotheSeebeckStageAreas(shownbelow).Theunknownsampleshouldbeinstalled
totheleftortheSeebeckStagecenter,andthereferencesampletotheright.Donotswitchthese
locations;otherwiseyouwillgetcompletelyincorrectresults!Forattachingthesamplestocopper
surfaces,onecaneitheruseregularsolderingalloys,orelectrically/thermallyconductivecementor
epoxy.Thebondingsubstanceshouldbeabletowithstandthetemperaturerangeoftheproposed
measurements.Materialsofhighspecificresistivityandlowthermalconductivityshouldnotbeused.
TheresistanceofthesampleplusthebondingmaterialtotheSeebeckStageshouldbelessthan
100Kohm.
Installtheunknownsamplefirst,usingthebondingmaterialofyourchoice,Theworkingjunctionshould
belocatedascloseaspossibletotheslotthatseparatesthetwocoppersurfacesoftheunknownand
referencesamples(seepage10),Thelocationoftheotherendofthesampleismuchlesscritical.Ifthe
samplecannotbeformedorfolded,attachitatanyconvenientpointonthecopperplatewhichis
commontotheunknownandreferencesamples,andasclosetothecenteraspossible.Installthe
referencesampleinasimilarmanner.Cutapproximately5millimeters(0.2")ofthereferencematerial
wiresuppliedwiththeSystem.ForthestandardSeebeckSystemversionthisisawireofConstantan.
Attachoneendofthewirepiecetothecopperplatewhichiscommontobothsamples.Usethesame
pointasfortheunknownsample.Theunknownandreferencesamplesshouldhavedirectthermal
contactinthispoint.Attachtheotherendofthereferencesampletakingintoaccountthesame
considerationsasforthetestedsample.Theworkingjunctionsofbothsamplesshouldhavesymmetrical
locationsrelativetothestageheater.Finally,usinganappropriatefluid,cleantheSeebeckStageof
possiblesurfacecontamination.WerecommendtheuseofFreon'sand/ormethylorethylalcohol.Any
cleaningmaterialsusedmustbenon‐conductive.
Notice:Beverycarefulwhilemountingthesamples.Badelectricalorthermalcontacts,asymmetrical
locationoftheworkingjunctions,andsurfacecontaminationcancauseseriousmeasurementerrors.
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GeneralOperation
Experiment Setup
NewProject
AsmentionedintheSeebeckDefinitionsonPage12,theExperimentparameterscannowbeentered.
IfnoK2000TemperatureControllerispresentselect'SkipTemperatureSettings,'thiswillcarryoutthe
experimentatAmbientTemperature(300Kwillbeusedforallcalculations).
SampleMountingStage:Selecttheappropriatestagetypethatthesampleismountedon.
HighImpedanceInput:SelecttheappropriateImpedanceSettingthatrelatestotheAmplifierinuse.
Gain:SelecttheappropriateGainvaluethatrelatestotheAmplifierinuse.
Note:ImpedanceandGainsettingsareindicatedontheAmplifierboardinsidethechamber.Thecorrect
settingsmustbeusedorerroneousdatawillresult.
Click'OK'
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GeneralOperation
Seebeck Software Layout
ExperimentView
Beforeselecting'Start'checkthevoltagesandtemperaturedata(ifaK2000ispresent),andcheckthe
SB1000statusinthe'ExperimentSetup'boxtoverifypropercommunication('Ready').Asshownabove,
thevoltagesarecloseto0andequal.Impropermaterialmountingwillcauseerroneousvoltages.
If'AutoStandby'wasselectedthe'K2000TemperatureController'willfirstsettheStandby
Temperature.
SelectingstartwillbegintheAutomatedDataCollectionprocess.Theprogressandstatuswillbeshown
ontherighthandsideoftheExperimentwindow.Iftheexperimentis'Started'beforethestandby
temperatureisreached,theexperimentwillwaituntilthetemperatureisreachedandthenbegin
automatically.
IfaK2000TemperatureControllerispresent,thetemperatureplotwillautomaticallybeginrecording
temperaturedata.
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GeneralOperation
Seebeck Software
Theabove'Complete'Experimentshowsthedatacollected.Theuserhastheoptionof:
1/.Savingthedatatotheinternaldatabasetoretrievelater(MainSuite‐>SB1000‐>Open).
2/.PrintingtheData(inDataViewclick'Print')
3/.PrintingthePlot(inGraphViewclick'Print')
4/.ExportingDatatoCommaSeparatedValues(inDataViewclick'Export.csv')forfurtheranalysisin
thirdpartysoftwaresuchasMicrosoftExcel.
5/.Viewingstatistics,(inDataViewclick'Statistics')
Note:SomeoptionsareonlyavailablewhentheExperimenthascompletedsuccessfully.
TheaboveplotshowstheTemperatureControlduringtheSeebeckExperiment.Thisdatacanbe
printedfromwithintheK2000TemperatureGraphWindowifneeded.
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GeneralOperation
Seebeck Software Statistics
TheaboveStatisticalResultsviewdisplaystheAverageValuesateveryTemperaturepoint.Standard
DeviationisalsopresentalongwiththePercentageChangeandMinMaxValues.Ifnotemperature
controlispresentonly1pointwillbeplotted.
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Communications Protocol
MainCommunicationsType:Serial
CommunicationsInterfaces:RS232,USB1.0
SerialSettings:9600,N,8,1
Handshaking:HardwareRTS/CTS
Echo:Yes
BusPairing:Parallel
HardwareCTSTimeout:1000ms
DataFormat:ASCII/PlainText
SystemCommands
CommandFormatExampleDescription
SMSMXSM1(1‐7)AveragingParameter2^nReadingsStartMeasurement
GVGVXGV1(1or2)Validwhenunitisinstandby.GetVoltage
SHSHXXXSH300(300mW)SetHeater
NN1 GetDeviceID
OO1 PowerDownUnit
Note:SendingcommandSMxstartsconstantmeasurementatdesiredaveragerate.
Communications&ByteOrder
CommandExample:'SM2'(startsmeasurementat2^2=4readingsperaverage)
1/.SetRTSHigh
2/.WaitforCTS
3/.Send'S'asaCharacter(VBExampleonNextPage)
4/.Send'M'asaCharacter(VBExampleonNextPage)
5/.SendAverageasa2‐ByteWord(HighbyteFirst,LowbyteSecond)
6/.SetRTSLow
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Communications Protocol
VisualBasicExample‐Sendingastartmeasurementcommand.'SM2'
PrivateSubForm_Load()
MSComm1.CommPort=2
MSComm1.DTREnable=False
MSComm1.Settings="9600,N,8,1"
MSComm1.RTSEnable=False
MSComm1.OutBufferSize=1024
MSComm1.RThreshold=1
MSComm1.SThreshold=0
MSComm1.PortOpen=True
EndSub
FunctionStartMeasurement()
DimcommandAsLong
DimvarAsInteger
DimcounterAsString
val=2'StartMeasurement2^2
counter=0
MSComm1.RTSEnable=True'SetRTSHigh
WhileMSComm1.CTSHolding<>True
counter=counter+1'WaitforCTSSignal
Ifcounter>200000Then
MSComm1.RTSEnable=False'ResetRTS
MsgBox("TimeOut")
ExitFunction
EndIf
Wend
MSComm1.OutBufferCount=0
MSComm1.InBufferCount=0'ClearBuffers
MSComm1.Output=Chr$(S)+Chr$(M)+Chr$(val/256)+Chr$(valMod256)
MSComm1.RTSEnable=False
EndFunction
