Qtech-data-systems Wireless Point to Point (WP2P) - Digital I__O Manuale Utente Scaricare il pdf (Pagina 2)

WirelessPointtoPoint-DIGITAL–QuickStartGuide–v2.1–June2013 2

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 www.qtech.co.nz Tel:033663713

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Wireless Point to Point System

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WirelessPointtoPoint(WP2P)modulescanbeusedtolinkelectricaldevicestogetherin

situationswherethephysicalseparationorterrainbetweenthemwouldmakedirectwiring

uneconomicorimpractical.

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TheWP2Pmodulesincorporatehighspeeddigitalradioswhichhavearangeofuptothree

kilometres.ThemostbasicWP2PsystemcomprisestwoWP2Pmoduleswhichhavebeen

configuredasapair.Themodulessimplyusetheironboardradiostocommunicatetheirinput

statetotheothermodule.

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EachWP2P-DIGITALmodulehasthreeswitchinputsandthreerelayoutputs.

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DigitalI/O

TheWP2Pmodulesoperatebycopyingthestateofeachswitchinputtothecorresponding

relayoutputontheotherWP2Pmodule.Whenaswitchinputisclosed,therelayoutputon

theothermodulewillclose,andwhentheswitchisreleased,therelaywillopenagain.

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WP2PModule1

Closeswitchcontacton“INP1”

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WP2PModule2

“RLY1”closesoperatinglight

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Thedelaybetweenaninputactivatingandthecorrespondingoutputactivatingisnormally

lessthan0.2seconds(seenoteatend).Withsuchafastresponsetime,theWP2Pmodules

canbeusedforflowmeterpulseapplications,allowingpulseratesofupto5pulsesper

secondtobecommunicated.

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Link Status Indicator

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WP2PmoduleshaveaLinkstatusLEDwhichislocatednexttothepowerconnector.

Thisistoassistwithsitediagnosticsandcheckingbyindicatingthestateofthe

communicationslinkbetweenpairsofWP2Pmodules.

TheLinklightfunctionsasfollows:

• OFF–Modulefailure,nopower,fuseblown,circuitfailure,etc.

• SLOWFLASH–Modulefunctioningbutnocommunicationwithitspartnermodule.

• ON–Healthywirelesscommunications.TheLEDwillbrieflyflickereachtimeit

receivesmessagesfromtheotherWP2Pmodule.

LinkStatusindicatorisbasedonthe“keep-alive”messagetheWP2Pmodulessendifithas

beenlongerthan30secondssincetheylastsentamessage.Thereforeifoneofthemodules

isturnedoff,thenitwilltakenolongerthan30secondsfortheothermoduletodetectthatthe

linkisdownandbeginflashingtheLinkStatusLED.IftheconnectedI/Oischangingmore

frequentlythanonceevery30seconds,thentheydon’tneedtosendkeep-alivemessages.

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Qtech-data-systems Wireless Point to Point (WP2P) - Digital I__O Manuale Utente Pagina 2

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