Crestron CNX-BF12 Dokumentacja Pobierz pdf (Strona 70)

EssentialsofCrestronProgramming

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70

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TheOneShotsymbolrespondstoarisingedgeonthe<trig>inputbydrivingtheoutput

signal(connectedto<out>)highforthedurationspecifiedbythedouble‐precision

<time>parameter.Theoutputsignalwillremainhighonlyforthisduration,regardless

ofwhatishappeningonthe<trig>input.Once<out>ha

sgonelow,thesymbolmaybe

re‐triggeredbyanotherrisingedge.Theoutput<out*>isthecomplementof<out>,just

aswesawwiththeTogglesymbol.

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OneShotalsohasa<reset>input.ThisinputallowsyoutocancelaOne‐Shotoperation

thatisalreadyinprogress.Thatis,on

cetheoutputpulsehasstarted,theonlywayto

cancelitbeforethefull<pulse_time>haselapsedisbydrivingthe<reset>inputhigh.

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ShownabovearetwoOneShot symbolsthataretriggeredoffbytheScreenUpand

ScreenDownbuttonpresses(s

inceonlyonerelaycanbeopenatatime),generatinga2‐

secondoutputpulsetodrivetherelaycommand.

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DrapesControl

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TheVirtualPresentationRoomusesasingle‐switch drapecontrollerforopeningand

closingthedrapes.Suchcontrollersoftenha

vealow‐voltagecontactclosureinterface:

closethecontactandthedrapesclose,openthecontactandthedrapesopen.Sincethe

touchpanelhastwobuttonsbeingroutedtoonerelay,weclearlyneedalatchingsignal

toconnecttotherelay.ASet/ResetLatchsymbolwillworkperfectlyfo

rthisapplication.

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TheSet/ResetLatchsymbolimplementsthemostbasicmemoryelement,alsoknownas

aset/resetflip‐flop.Thesymbolhastwopossiblestates,referredto(oddlyenough)asset

andreset.Arisingedgeofthe<set>inputwillsetthelatchandcause<ou

t>togohigh.

Oncethistransitionisseentheoutputwillnotchangeuntilarisingedgeisseenonthe

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Crestron CNX-BF12 Dokumentacja Strona 70