Sierra Wireless RAVEN 20070914 User Manual Page 63

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Data Communication and Host Modes
Rev 3.0B Feb.08 58
untilitreceivesanacknowledgementwiththissequence
number.Ifanacknowledgementisnotreceivedwithinthe
timeoutperiod(specifiedinS7),thedatawillberetrans
mitted.Thiswillcontinueuntilanacknowledgementis
receivedorthemodemisreset.LikewiseanyUDPpackets
receivedbytheRavenareexpectedtohavethissimpleheader.
TheRavenwillissueanacknowledgementforanyvalid
packetswhicharereceived.
ToconfiguretheRavenforanormalUDPsession,youneedto
settheStartupModeDefaultto73(ATMD73).Ifyouareusing
twomodems,configuretheDestinationIPandPortineachto
pointtoeachother.Serialdatawillthenbesentreliably
betweenthetwo.
Caution: Although it adds reliability, the simple implementation of the
Reliable UDP mode in the does not check for duplicate packets.
UDP Multicast Mode
UDPMulticastmoderesultsinanydatareceivedfromthehost
serialportbeingsenttoalltheclientsintheaddresslist.The
remoteportnumberistakenfromS53.Toavoidfloodingthe
network,thepacketsaresenttoeachclientwitha20mspause
inbetween.Thereceipt
ofUDPpacketsworksasinnormal
UDPmode(i.e.boundbythevalueS53and/orAIP).Sinceit
maytakeawhiletotransmitthedatatoallhosts(especial lyif
all20Modbusentriesareusedandnameresolutionsare
required),newdatareceivedfromthehostport
isbuffered
untilcurrenttransmissionstoallhostsarefinished.
EnterthelistoftargetIPsintheaddresslist(ADDRLIST).The
indexnumbersinthelistarenʹtused.Configureforanormal
UDPsession.SettheSt artupModeDefaultto83(ATMD83).
ConfiguretheDestinationporttomatchthedeviceportofthe
remotemodems.
TCP and TCP Pad
WhentheRavenisinaTCPsession,allcharactersreceivedon
theserialportareassembledintoTCPpacketsandsenttothe
modeʹsremoteIPaddress/port,andanypacketsreceivedfrom
theremoteendoftheTCPconnectionaredisassembledand
dumpedontotheserialline.
ATCPconnectionisestablishedbyoneofthefollowing
methods:
UsingtheDialTCP(DT)ATcommand.Forexample,
ATDT192.168.3.23/3456.
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