Crestron CNX-BF12 Specifikace stáhnout pdf (Strana 84)

EssentialsofCrestronProgramming

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84

AppleTVs

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TheVirtualPresentationRoomfeatures2AppleTVservers.Thissectionwilldiscuss

howtouseBuffersymbolsfordevicesthatuseasharedsetofbuttons.Thetouchpanel

projectprovidesonesubpagethatcontainsthetransportcontrolsforanAppleTV

device.ThissubpagecanbecalledupbyeitherofthetwoAp

pleTVsourcesinthe

SIMPLprogram.TheBuffersymbolallowstheprogramtodeterminewhichAppleTV

sourcethetransportbuttonswillcontrol.

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TheBuffersymbolcanbethoughtofasagatethatcanbeopenedorclosed,thus

controllingtheflowofda

ta.Whenthegateisopen,digitalsignalsareallowedtoflow

unalteredfromtheinputstothecorrespondingoutputs.Whenthegateisclosed,all

outputsignalsaresettologiclowandtheinputsignalshavenoeffectonthem.

Openingandclosingthegateishandledbythe<enable>input.Whenth

esignal

connectedtothisinputishigh,theBufferisenabled(thegateisopen),andwhenthis

signalislow,thesymbolisdisabled(thegateisclosed).

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ThesourceselectbuttonpressforAppleTV1willbeconnectedtothe<enable>inputof

oneBuffersymbol,whilethebuttonpressforAp

pleTV2willbeconnectedtothe

<enable>inputofasecondBuffersymbol.WhenagivenBufferisenabledthetransport

controlsignalswillflowuninterruptedtothecorrespondingIRport.

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NotefromtheexamplethatonlyoneBuffershouldbeenabledatanygiventime.Iftwo

Bufferswereenabledatonce,pressingthePLAYbuttonwouldcausemultiple

commandstobeissued,whichisnotwhatwewant.Therefore,theSIMPLprogram

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Crestron CNX-BF12 Specifikace Strana 84