Campbell-scientific CR3000 Micrologger Manuale Utente Pagina 466

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Section 11. Glossary
466
RS232
RecommendedStandard232.Aloosestandarddefininghowtwo
computingdevicescancommunicatewitheachother.The
implementationofRS232inCampbellScientificdataloggerstoPC
communicationsisquiterigid,buttransparenttomostusers.
ImplementationofRS232inCampbellScientificdataloggertoRS232
smartsensorc
ommunicationsisquiteflexible.
samplerate
Therateatwhichmeasurementsaremade.Themeasurementsample
rateisprimarilyofinterestwhenconsideringtheeffectoftimeskew
(i.e.,howcloseintimeareaseriesofmeasurements).Themaximum
sampleratesaretheratesatwhichmeasurementsaremadewhen
initiatedbyasingleinstructionwithm
ultiplerepetitions.
scaninterval
ThetimeintervalbetweeninitiatingeachexecutionofagivenScan()of
aCRBasicprogram.IftheScan()Intervalisevenlydivisibleinto24hours
(86,400seconds),itissynchronizedwiththe24hourclock,sothatthe
programisexecutedatmidnightandeveryScan()Intervalthereafter.
Thepro
gramisexecutedforthefirsttimeatthefirstoccurrenceofthe
Scan()Intervalaftercompilation.IftheScan()Intervaldoesnotdivide
evenlyinto24hours,executionwillstartonthefirstevensecondafter
compilation.
scantime
WhentimefunctionsareruninsidetheScan()/NextScanconstruct,
timestampsarebasedonwhenthescanwasstartedaccordingtothe
CR3000clock.Resolutionofscantimeisequaltothelengthofthescan.
Seesystemtime
(p.470).
SDI12
SerialDataInterfaceat1200bps.Communicationprotocolfor
transferringdatabetweendatarecordersandsensors.
SDM
Synchronousdeviceformeasurement.Aprocessorbasedperipheral
deviceorsensorthatcommunicateswiththeCR3000viahardwireover
ashortdistanceusingaproprietaryprotocol.
SeebeckEffect
InducesmicroVoltlevelthermalelectromotiveforces(EMF)across
junctionsofdissimilarmetalsinthepresenceoftemperaturegradients.
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