Crestron CNX-BF12 Specifiche Scaricare il pdf (Pagina 90)

EssentialsofCrestronProgramming

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90

User Modules

CrestronprocessorscontrolserialdevicesusingphysicalstandardssuchasRS‐232,RS‐

422,andRS‐485.UnlikeIR,RS‐232controldoesnotuseready‐to‐godriverfiles.Instead,

theprotocolthatthedeviceisexpectingwillbeprovidedbythemanufacturerinthe

unitʹsdocumentation.Thisprotocolincl

udesthedatathatthedeviceexpectstoreceive

andtransmit,theformatoftheserialcommands,thespeedatwhichitcommunicates

(baudrate),theerrorchecking(parity),andotherelementswhichallhavetobeadjusted

inamoduletomatchthemanufacturerʹsspecification.

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Becauseoftheabsenceofadriverfile,RS‐232controlisgenerallyconsideredmore

difficulttopr

ogramthanIR.ThisisbecauseeachtimeanRS‐232deviceistobe

programmed,theprogrammermustlookuptheprotocolinthemanual,andthenwrite

thenecessarylogicintotheprogramtosendth

isdata.(Tocounterthis,manydevices

havededicatedCrestronmoduleswrittenforthem.Thesemodulescanbepluggedinto

aprogramandusedtogenerateallthepropercontrolcodesautomatically.)

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TheVirtualPresentationRoomincorporatesasimplemodulethatsendsserialcommand

stringstotheprojectortoturntheprojectoronandoffandtoselectsources.Theserial

outputstrin

gofthemoduleistransmittedtotheCOMportviathe<tx$>inputofthe

builtinserialdriver,andontotheprojectorviatheserialcable.

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Elementsofausermodule

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AmoduleconsistsofanArgumentDefinition,whichrepresentshowthesymbolwill

lookinSIMPLWindows,andlogicsymbols.

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Theinputs,outputsandparametersoftheArgumentDefinitionareassociatedwith

signalsandparametersdefinedinthemodule.

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Crestron CNX-BF12 Specifiche Pagina 90