Robustel M1000 Pro V2 Especificaciones descargar pdf (Pagina 46)

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

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RT_M1000Pro_UG_v01.01 27.12.2011 45/59

Confidential

4.3.3 UDPMode

The main difference between theTCP and UDP  pro tocols  is that TCP guarantees delivery of data by requiring the

recipient to send an acknowledgement  to the sender. UDP does not require this type of verification, making it

possibletoofferfasterdelivery.UDPalsoallowsyoutounicastdatatooneIP,ormulticastthedatatoagroupofIP

addresses.

ThesetraitsmakeUDPmodeespeciallywellsuitedformessagedisplayapplications.

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If your cellular ISP offers a fixed public IP address after you connect to the cellular network, you can access the

M1000ProfromahostPCthathasafixedpublicIPbidirectional.

IfM1000ProhasnofixedpublicIP,thenitcanunicastdatatoonehostunidirectional.

Note:M1000Prosupportsunicastonly.

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4.3.4 VirtualCOMMode

OneofthemajorconveniencesofusingVirtualCOMmodeisthatitallowsyoutouseVirtualCOMsoftwarethatwas

writtenforpureserialcommunicationapplications.TheVirtual COMdriverinterceptsdata senttothehost’s COM

port,packsitintoaTCP/IPpacket,andthenredirectsitthroughthehost’sEthernettotheInternet.Attheotherend

oftheconnection,theM1000ProacceptstheIP frame from the cellular network, unpacks the TCP/IP packet, and

thentransparentlysendsthedatathroughtheserialporttotheattachedserialdevice.

Weprovideapplicationnotestointroducehowtoworkwith3

parties’popularvirtualcomsoftware,pleasecontact

ustogetmoreinformation.

Note:

Virtual COM software (COM port redirector) is a specialized software (often including device driver and user

application)thatincludestheunderlyingnetworksoftwarenecessarytoaccessnetworkeddeviceserversthatprovide

remoteserialdevicesormodems.

ThepurposeoftheredirectoristomakethevirtualCOMportexhibitbehaviorthatcloselyresemblesthatofa"real"

COM port, i.e., a COM port driver for local serial porthardware. A virtual COM port itself is a relatively simple

softwaremec hanismthatcanbeimplemented bydriversoftwaresimilartothatof  aconventionalCOMportdriver.

The main challengesariseintwo other areas: the network connection tothe deviceserver and thebehavior ofthe

deviceserver.TheseissuesaredescribedintheTechnologysectionbelow.

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Robustel M1000 Pro V2 Especificaciones Pagina 46