Qtech-data-systems Wireless Point to Point (WP2P) - Digital I_

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

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Qtech-data-systems Wireless Point to Point (WP2P) - Digital I__O User Manual Page 5