User guide

WirelessPointtoPoint-DIGITAL&ANALOGUE-QuickStartGuide–v1.1–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two
kilometres.Themodulesusetheintegratedlowpower900MHzdigitalradiostocommunicate
theirinputstatetotheothermodule.
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EachWP2P–DIGITAL&ANALOGUEmodulehastwoswitchinputs,tworelayoutputs,one
analogueinputandoneanalogueoutput.
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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notes).Withsuchafastresponsetime,theWP2Pdevices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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AnalogueI/O
TheWP2P–DIGITAL&ANALOGUEoperatesbycopyingtheanalogueinputvaluetothe
analogueoutputontheothermodule.
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TheanalogueI/Ocanbeconfiguredforcurrentlooporvoltageoperation.Thefactorydefault
configurationisforcurrentloopoperation.TheanalogueI/Ooperatesoverarangeof0-
20mA,whichmakestheWP2P–DIGITAL&ANALOGUEmodulescompatiblewiththe
industrystandard4-20mArange,whichallowsdetectionofanopencircuitfailure.
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TheAnalogueI/Ohas12bitresolution,astatedaccuracyof+/-1%FSD,andissampledata
rateofoncepersecond.
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WP2PModule1
Analogue0-20mAsignalinput
WP2PModule2
Analogue0-20mAsignaloutput