Crestron CNX-BF12 Especificações descarregar pdf (Página 78)

EssentialsofCrestronProgramming

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78

MoreonSerialStrings

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Bydefault,serialsignalsaretransient,meaningthatthedataonaserialsignalisonly

validforthelogicwave(definedbelow)inwhichitwascreated.Alogicwaveisa 

processorunitofmeasurementdefinedastheelapsedtimebetweenthemomenta

signalʹssta

techangesandthemomentthatallsymbolsconnectedtothatsignalhave

beenevaluated.Thisisanalogoustothetermʺpropagationdelayʺusedwhendescribing

digitalhardware.

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SymbolssuchastheMakeStringPermanentsymbolallowserialstringstoberetainedin

memoryforaslongastheprogramisrunning.(Theserialdataisremovedfrom

memorywhentheprogramresetsorshutsdown.)Inadditio

n,mostCrestron

touchpanelsincludea<PermanentStringSize>parameterthatmakesserialstrings

connectedtothetouchpanelsymbolpermanent.

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TimeandDate

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TheVTPro‐eprojectincludesanindirecttextfieldinwhichth

ecurrentdateisdisplayed.

Thedateistakenfromtheinternalclockofthecontrolsystemandcanbeformattedin

differentways.

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SinceuploadinganewVisionToolsPro‐eprojecttoatouchpanelwillcausethe

touchpanellosethedate(butnotthetime),thepr

ogrammingincludesaMakeString

Permanentsymbol.

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TheClockDriversymbolisusedtoretrievethetimeofdayfromtheinternalclockofthe

controlsystem.

The <dst> parameter specifies the format for Daylight Savings Time,

where 1d corresponds to United States DST.

TheTODistransmittedonthe<tod$>serial

output.

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Crestron CNX-BF12 Especificações Página 78