Sierra Wireless 20070914 Cell Phone User Manual


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Data Communication and Host Modes
Rev 3.0B Feb.08 56
SLIP
SLIPmodeisenteredbeusingthe“AT\ASLIP”command.As
inPPPMode,theIPaddressthatthehostassumesisaffected
bythesettingof*HOSTPRIVMODE.SLIPdoesnotnegotiate
theIPaddresswiththeconnecteddeviceorcomputer,so
beforemakingaSLIPconnection,theSLIPdriveron
that
deviceorcomputermustbeconfiguredtousetheIPaddress
specifiedbyqueryingS110.
UDP and UDP Pad
WhenthemodemisinUDPPAD(PacketAssemblyandDisas‐
sembly)Mode,allcharactersreceivedontheserialportare
assembledintoUDPpacketsandsenttotheremoteIP
address/portortheRaven,andanypacketsreceivedfromthe
sameIP/port‐destinedforthedeviceportofRaven(see
*DPORT)‐‐aredisassembledanddumpedontotheserialline.
AUDPsessionisinitiatedbyoneofthe f ollowingevents:
• UsingtheDialUDP(DP)ATcommand(example,
ATDP192.168.3.23/3456).
• SettingtheStartupModeDefault(M D)to3(UDP)sothat
aUDPsessionisenteredautomaticallywhenthemodem
registersontothenetwork.Serialdatawillbesenttothe
IP/portspecifiedinS53.
IncomingUDPpacketswillbeprocessedouttheserialportif
• UDPautoanswerisenabled(S82=2);
• ThedestinationIPaddressmatchesthatinS53(ifFriends
Modeisenabled,theIPaddressalsoneedstobepresent
ontheFriendsList);
• OrallowanyIPisset(AIP=1);
• ThemodemisinATmode(notinacurrentUDPorTCP
session).
UDPpacketassemblyisaffectedbythevaluesofS50(PAD
ForwardingTime‐out)andS51(PADForwardingCharacter).
Datareceivedintheserialbufferwillbetransmittedwhenthe
idleinter‐charactertime‐outspecifiedinS50(intenthsof
seconds)occursorwhenacharacterisreceivedthatmatches
S51(ifnon‐zero).
UDP Auto Answer
UDPautoanswer(previouslycalledUDPhalf‐open)isset
withS82=2.Whenset,theRavenwillautomaticallyestablisha
UDPsessiontothesourceIPaddressandportoftheUDP
packetreceived.TheRavenwillremain“locked”tothisone
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