Crestron CNX-BF12 Specifikace stáhnout pdf (Strana 90)

EssentialsofCrestronProgramming



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.



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.)



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.



Elementsofausermodule



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

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



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

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

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 99 100

Žádné komentáře

Crestron CNX-BF12 Specifikace Strana 90