Campbell-scientific CR1000 Measurement and Control System Instrukcja Użytkownika Pobierz pdf (Strona 455)

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Section 11. Glossary

455

FLOAT

Four‐bytefloating‐pointdatatype.DefaultCR1000datatypeforPublic

orDimvariables.SameformatasIEEE4.IEEE4isthenameusedwhen

declaringdatatypeforstoreddatatabledata.

FP2

Two‐bytefloating‐pointdatatype.DefaultCR1000datatypeforstored

data.WhileIEEEfour‐bytefloatingpointisusedforvariablesand

internalcalculations,FP2isadequateformoststoreddata.FP2provides

threeorfoursignificantdigitsofresolution,andrequireshalfthe

memoryasIEEE4.

FTP

FileTransferProtocol.ATCP/IPapplicationprotocol.

fullduplex

Systemsallowcommunicationssimultaneouslyinbothdirections.

garbage

Therefuseofthedatacommunicationworld.Whendataaresentor

receivedincorrectly(therearenumerousreasonswhythishappens),a

stringofinvalid,meaninglesscharacters(garbage)oftenresults.Two

commoncausesare:1)abaud‐ratemismatchand2)synchronousdata

beingsenttoanasynchronousdeviceandvi

ceversa.

globalvariable

AvariableavailableforusethroughoutaCRBasicprogram.Thetermis

usuallyusedinconnectionwithsubroutines,differentiatingglobal

variables(thosedeclaredusingPublicorDim)fromlocalvariables,

whicharedeclaredintheSub()andFunction()instructions.

ground

Beingorrelatedtoanelectricalpotentialof0Volts.

halfduplex

Systemsallowbi‐directionalcommunications,butnotsimultaneously.

handshake,handshaking

Theexchangeofpredeterminedinformationbetweentwodevicesto

assureeachthatitisconnectedtotheother.Whennotusedasaclock

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