Robustel M1000 Pro V2 Dokumentacja Pobierz pdf (Strona 41)

RobustelGoRuggedM1000ProUserGuide

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RT_M1000Pro_UG_v01.01 27.12.2011 40/59

Confidential

Chapter4. TypicalApplications

4.1 Overview

Cellulardatatransmissionisanincreasinglyattractivemechanism forcommunication withremote,non‐permanent

or mobile devices. Being able to collect and distribute data virtually anywhere without requiring the limitation of

working within specific fixed linenetworks is  a powerfulforcefor efficiency and reliability.However, the fact that

cellular datais metered means that the frequency of transmission andamountof data sent in each exchangecan

havesignificantcostandperformanceimpact.

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Inordertounderstandthisimpact,letusstartwithafairlytypicalexample,wherethereisadeviceinthefieldand

anapplicationonaserveratacentralsitelocationthatcollectsinformationfromthatdevice.

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Ingeneral,thepurposeofcommunicationwiththedevicewillbeforoneoftworeasons:

•Monitoring‐Statusmonitoringdata,suchasthelevelortemperatureofastoragetank,thevelocityandpressure

ofapipeline,theconditionofacontrollerorthestatusofaregister.

•Transactiondata–Discreteeventdata,suchascashorcredittransactions,PBXcallrecordsormission‐criticaland

safetyrelatedalarms.

Status monitoring data is often “polled.” The application sends out periodic queries and gets responses to those

queries.Theapplicationcanusuallyretryifitdoesnotgetananswer,anddeterminethataproblemexistsifitdoes

notgetaresponseafteracertainamountofretries.

Discreteeventdataisusually“unsolicited.” Theapplicationdoesnotexpecttogetinformationonanyregularbasis,

andthereforethefailuretohearfromthedeviceisthenormalcase(thoughsomesortof“alliswell”messagemay

besentatalongerinterval).

Mostapplicationswilllikelyinvolveoneorbothofthesemethods anddataistransmittedinTCPorUDPpackets.

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Robustel M1000 Pro V2 Dokumentacja Strona 41