User guide

Data Communication and Host Modes

Rev 3.0D Jul.09 60

Link Radio Coverage

Therearethreeoptionsforthe“Link Radio Coverage to”field.

YoucanlinkradiocoveragetoeitherEthernetorUSB(USBnet

orUSBserial)ordisablethespecifiedport.Hence,whennotin

coverage,thespecifiedhostportisturnedoff.Minimumoff‐

timeof10secondsapplyforbothUSBandEthernet.

Note: When the cellular connection is down, the port is also down.

SLIP

SLIPmodeisenteredbeusingthe“AT\ASLIP”command.As

inPPPMode,theIPaddressthatthehostassumesisaffected

bythesettingof*HOSTPRIVMODE.SLIPdoesnotnegotiate

theIPaddresswiththeconnecteddeviceorcomputer,so

beforemakingaSLIPconnection,theSLIPdriveron

that

deviceorcomputermustbeconfiguredtousetheIPaddress

specifiedbyqueryingS110.

WhenthemodemisinUDPPAD(PacketAssemblyandDisas‐

sembly)Mode,allcharactersreceivedontheserialportare

assembledintoUDPpacketsandsenttotheremoteIP

address/portortheRavenXT,andanypacketsreceivedfrom

thesameIP/port‐destinedforthedeviceportofRavenXT(see

*DPORT)‐‐aredisassembledanddumpedontotheserialline.



AUDPsessionisinitiatedbyoneofthe f ollowingevents:

• UsingtheDialUDP(DP)ATcommand(example,

ATDP192.168.3.23/3456).

• SettingtheStartupModeDefault(M D)to3(UDP)sothat

aUDPsessionisenteredautomaticallywhenthemodem

registersontothenetwork.Serialdatawillbesenttothe

IP/portspecifiedinS53.

IncomingUDPpacketswillbeprocessedouttheserialportif

• UDPautoanswerisenabled(S82=2);

• ThedestinationIPaddressmatchesthatinS53(ifFriends

Modeisenabled,theIPaddressalsoneedstobepresent

ontheFriendsList);

• OrallowanyIPisset(AIP=1);

• ThemodemisinATmode(notinacurrentUDPorTCP

session).

UDP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