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Sierra Wireless 20070914 Cell Phone User Manual

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Data Communication and Host Modes

Rev 3.0B Feb.08 69

UDP Multicast Mode

UDPMulticastmoderesultsinanydatareceivedfromthehost

serialportbeingsenttoalltheclientsintheaddresslist.The 

remoteportnumberistakenfromS53.Toavoidfloodingthe

network,thepacketsaresenttoeachclientwitha20mspause

inbetween.Thereceipt

ofUDPpacketsworksasinnormal

UDPmode(i.e.boundbythevalueS53and/orAIP).Sinceit

maytakeawhiletotransmitthedatatoallhosts(especiallyif

all20Modbusentriesareusedandnameresolutionsare

required),newdatareceivedfromthehostport

isbuffered

untilcurrenttransmissionstoallhostsarefinished.

EnterthelistoftargetIPsintheaddresslist(ADDRLIST).The

indexnumbersinthelistarenʹtused.Configureforanormal

UDPsession.SettheStartupModeDefaultto83(ATMD83).

ConfiguretheDestinationporttomatchthedeviceportofthe

remotemodems.

TCP and TCP Pad

WhenthePinPointXisinaTCPsession,allcharacters

receivedontheserialportareassembledintoTCPpacketsand

senttothemodeʹsremoteIPaddress/port,andanypackets

receivedfromtheremoteendoftheTCPconnectionaredisas

‐

sembledanddumpedontotheserialline.

ATCPconnectionisestablishedbyoneofthefollowing

methods:

• UsingtheDialTCP(DT)ATcommand.Forexample,

ATDT192.168.3.23/3456.

• TCPautoanswerisenabled(S1),aTCPconnectionrequest

isreceived,andthemodemisnotinadatasession.

• Dataisreceivedontheserialportand

· TheStartupModeDefault(MD)is4(autoTCP)

· TheremoteTCPdestination,asdefinedinS53,success‐

fullyrespondstotheTCPconnectionrequest.

ThevalueofS7(TCPConnectionTime‐out)specifiesthe

numberofsecondstowait,afterinitiatingaTCPconnection

attempt,forasuccessfulconnectiontobeestablished.Ifthe

connectionhasnotbeensuccessfullyestablishedbeforethe

time‐outoccurs,ERROR/BUSYisreturned.

TCPpacketassemblyisaffectedbythevaluesofS50(PAD

ForwardingTime‐out)andS51(PADForwardingCharacter).

Datareceivedintheserialbufferwillbetransmittedwhenthe

idleinter‐charactertime‐outspecifiedinS50(intenthsof

seconds)occursorwhenacharacterisreceivedthatmatches



S51(ifnon‐zero).

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