Qtech-data-systems Wireless Point to Point (WP2P) - Digital I__O Manuel d'utilisateur télécharger pdf (Page 5)

WirelessPointtoPoint-DIGITAL–QuickStartGuide–v2.1–June2013 5



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



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”.



Warning–Donotusethesamechannelforadjacentsystems.

Forexample,ifyoucurrentlyuse“#1”ensuretheadjacentsystemis“#3”etc.



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.



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.



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.



Specificationsmaybesubjecttochange

1 2 3 4 5 6 7

Pas de commentaire

Qtech-data-systems Wireless Point to Point (WP2P) - Digital I__O Manuel d'utilisateur Page 5