Crestron CNX-BF12 Specifikace stáhnout pdf (Strana 56)

EssentialsofCrestronProgramming

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56

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Thesubmenualsoincludestheoptiontodisplaythedevicefunctions,whichcanhelp

youverifythatthedeviceprovidestheexpectedcommands.ClickShow

IRFunctionstoviewthecommands.

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Relays

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Manydevicesemployinternalelectronicsthatallowfunctionstobetriggeredthrough a

simpleelectricalcontact.Intheworldofcontrolsystems,thisisaccomplishedusing

relays.Devicessuchasscreens,drapesandprojectorliftstendtousethistypeof

interface.Inaddition,somenot‐dimmedlightingcircuitsca

nbeswitchedonandoff

usingrelays.

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Crestronmanufacturesrelaysofmanydifferentflavors:low‐powerrelaysforusewith

devicesthatdonotdrawalotofcurrentorrequirehighvoltages,andhigh‐powerrelays

fordirectcontrolofmotorsandlightingcircuits.Inaddition,relayscaneit

herbe

mechanicalorsolid‐state.

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Toconfigurearelaydevice,thecontrolsystemmusthavearelaycardinstalled.Most

Crestroncontrolsystemsprovideabuilt‐inrelaycard;forexample,theC2I‐RY8cardis

builtintothePRO2.Itprovideseightlow‐voltagerelayports.Inaddition,Crestron

manufacturesplug‐inre

laycards,suchasCNXRY‐8,thatcanbeinstalledinthe

expansionslotsofthecontrolsystem.

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Crestron CNX-BF12 Specifikace Strana 56