User guide

WirelessPointtoPoint-DIGITAL–QuickStartGuide–v2.1–June2013 5
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 www.qtech.co.nz Tel:033663713
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WP2Psystemstobeusedinthesamelocation.The“Channelnumber”isidentifiedbythe“#”
onthepackaginglabel;thisexampleis“Channel#1”.
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Warning–Donotusethesamechannelforadjacentsystems.
Forexample,ifyoucurrentlyuse“#1”ensuretheadjacentsystemis“#3”etc.
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Operationalnote–Howdothemodulescommunicate?
TheWP2Pmodulesusean“eventdriven”approachtocommunications.Whenthestateof
anyinputchangestheWP2Pmodulewillimmediatelycommunicatethatchangetotheother
WP2Pmodule.Thisapproachresultsinveryfastresponsetimes.
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IfthecommunicationslinkbetweenapairofWP2Pmodulesgoesdown(forexampleifoneof
themlosespower),thentherelayoutputstateoftheonmoduleismaintainedatthevalueit
waspriortothelinkgoingdown.
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WhentheWP2Pmodulesdetectachangeoftheirinputstate,theywillimmediatelytransmita
messagetotheothermodule.ThereisaverysmallchancethatanotherWP2Pmoduleon
thatchannelalsowantedtosendamessageatexactlythesametime.Thiswillresultina
“collision”,buttheWP2Pmodulescandetectthatacollisionhasoccurred,andwillthenusea
collisionavoidanceschemetoretransmittheirmessages.
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Specificationsmaybesubjecttochange