Campbell-scientific CR3000 Micrologger Manual do Utilizador descarregar pdf (Página 466)

Section 11. Glossary

466

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RS‐232

RecommendedStandard232.Aloosestandarddefininghowtwo

computingdevicescancommunicatewitheachother.The

implementationofRS‐232inCampbellScientificdataloggerstoPC

communicationsisquiterigid,buttransparenttomostusers.

ImplementationofRS‐232inCampbellScientificdataloggertoRS‐232

smart‐sensorc

ommunicationsisquiteflexible.

samplerate

Therateatwhichmeasurementsaremade.Themeasurementsample

rateisprimarilyofinterestwhenconsideringtheeffectoftimeskew

(i.e.,howcloseintimeareaseriesofmeasurements).Themaximum

sampleratesaretheratesatwhichmeasurementsaremadewhen

initiatedbyasingleinstructionwithm

ultiplerepetitions.

scaninterval

ThetimeintervalbetweeninitiatingeachexecutionofagivenScan()of

aCRBasicprogram.IftheScan()Intervalisevenlydivisibleinto24hours

(86,400seconds),itissynchronizedwiththe24‐hourclock,sothatthe

programisexecutedatmidnightandeveryScan()Intervalthereafter.

Thepro

gramisexecutedforthefirsttimeatthefirstoccurrenceofthe

Scan()Intervalaftercompilation.IftheScan()Intervaldoesnotdivide

evenlyinto24hours,executionwillstartonthefirstevensecondafter

compilation.

scantime

WhentimefunctionsareruninsidetheScan()/NextScanconstruct,

timestampsarebasedonwhenthescanwasstartedaccordingtothe

CR3000clock.Resolutionofscantimeisequaltothelengthofthescan.

Seesystemtime

(p.470).

SDI‐12

SerialDataInterfaceat1200bps.Communicationprotocolfor

transferringdatabetweendatarecordersandsensors.

SDM

Synchronousdeviceformeasurement.Aprocessor‐basedperipheral

deviceorsensorthatcommunicateswiththeCR3000viahardwireover

ashortdistanceusingaproprietaryprotocol.

SeebeckEffect

Inducesmicro‐Voltlevelthermalelectromotiveforces(EMF)across

junctionsofdissimilarmetalsinthepresenceoftemperaturegradients.

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