Campbell-scientific CR800 and CR850 Measurement and Control Systems Uživatelský manuál stáhnout pdf (Strana 437)

100

101

Section 11. Glossary

437

NeighborDevice

DevicesinaPakBus®networkthatcancommunicatedirectlywithan

individualdevicewithoutbeingroutedthroughanintermediatedevice.

SeePakBus

(p.438).

NIST

NationalInstituteofStandardsandTechnology

Node

PartofthedescriptionofadataloggernetworkwhenusingLoggerNet.

Eachnoderepresentsadevicethatthecommunicationsserverwilldial

throughorcommunicatewithindividually.Nodesareorganizedasa

hierarchywithallnodesaccessedbythesamedevice(parentnode)

enteredaschildnodes.Anodecanbebot

haparentandachild.

NSEC

Eight‐bytedatatypedividedupasfourbytesofsecondssince1990and

fourbytesofnanosecondsintothesecond.

Null‐modem

Adevice,usuallyamulti‐conductorcable,whichconvertsanRS‐232

portfromDCEtoDTEorfromDTEtoDCE.

offset

aterm,oftenaparameterinaCRBasicmeasurementinstruction,to

designatethey‐intercept,shiftingfactor,orzeroingfactorinalinear

function.Forexample,whenconverting°Cto°F,theequationis°F=

°C*1.8+32.Thefactor32istheoffset.

Ohm

Theunitofresistance.SymbolistheGreekletterOmega(Ω).1.0Ω

equalstheratioof1.0Voltdividedby1.0Amp.

Ohm'sLaw

Describestherelationshipofcurrentandresistancetovoltage.Voltage

equalstheproductofcurrentandresistance(V=I*R).

on‐linedatatransfer

Routinetransferofdatatoaperipherallefton‐site.Transferis

controlledbytheprogramenteredinthedatalogger.

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