Network Router User Manual

Data Communication and Host Modes
Rev 3.0B Feb.08 64
meantime)untilitreceivesanacknowledgementwiththis
sequencenumber.Ifanacknowledgementisnotreceived
withinthetime‐outperiod(specifiedinS7),thedatawillbe
retransmitted.Thiswillcontinueuntilanacknowledgementis
receivedorthemodemisreset.LikewiseanyUDPpackets
receivedbythePinPoint‐E
areexpectedtohavethissimple
header.ThePinPoint‐Ewillissueanacknowledgementforany
validpacketswhicharereceived.
ToconfigurethePinPoint‐EforanormalUDPsession,you
needtosettheStartup ModeDefaultto73(ATMD73).Ifyou
areusingtwomodems,configuretheDestinationIPandPort
ineachtopointtoeachother.Serialdatawillthenbesent
reliablybetweenthetwo.
Caution: Although it adds reliability, the simple implementation of the
Reliable UDP mode in the does not check for duplicate packets.
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 ‐E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.