User guide

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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