Specifications

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.