User's Manual

CHAPTER6
SERIALAPPLICATIONS
Revised: 27 Jun 16 6-5 ESTeem Horizon Series
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SerialFlowControl
SelectthetypeofdataflowcontrolusedontheRS‐232connection.TheESTeemcansupportHardwareflowcontrol(RTS/CTS
controllines)orSoftwareFlowControl(XON/XOFF).SelectNoneifnoserialflowcontrolisnecessary.
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SerialMulticastTTL(MaximumBridgeLinksforMulticastPackets)
ThisvaluesetsthemaximumnumberofEthernetbridge linksthatthemulticastpacketswillbesentthroughwhenusedinamulti‐
pointsystem.Amulti‐pointserialnetworkusesmulticastpackets(UDP)tosendthedatatomorethanoneremoteESTeem.You
want to limit the number of network bridg
e links that these UDP packets will be passed through to make the network more
efficient.
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IfyouareusingmultipleEST eemrepeaterlinkstosendtheserialdatatoremotelocations,thevalueforthemaximumbridgelink
needstobeincreasedtoanumbergreaterthanthelongestrepeaterchain.Forexample,ifyouareusingfourrepeater(peer)
linkstosendtheserialdatabetweentwoor moresitesthenumberwillneedtobefive(5)orgreater(Figure4).
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DestinationIPAddress
TheESTeemconfiguredforthecorrectdestinationIPandpor tnumberwillsendandre ceiv e theserialdatafromanothermodem.
SetthedestinationIPaddress fortheESTeemwheretheserialdatawillbesent. IfsendingtomorethanoneESTeem(Multipoint)
settoamulticastaddress(i.e224.0.0.1).
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Note:Ifyouar
eusingtheESTeemHorizoninamultipointapplication(multicast),youmusthavedefaultGatewayconfiguredin
theESTeemsettotheIPaddressoftheRootBridgemodem.
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DestinationPort
TheESTeemconfiguredforthecorrectdestinationIPandpor tnumberwillsendandre ceiv e theserialdatafromanothermodem.
SettheIPportnumberstomatchwheretheseri al datawillbesent.TheserialdatawillnotbesentifboththeIPaddressandport
numberisnotcorrect.
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MaximumPacketSize
Thisnumberrepresentsthemaximumsizeoftheserialdatapacketinbytes.Ifthenumberofbytesofdataintheserialportbuffer
exceedsthe maximumpacketsize beforethetimer ordelimitercharacterisreached, theESTeemwill sendforwardthe serial
packet.Forexample ,ifthemaximumpacketsizeissettoavalueof100,whentheserialportre ceiv es 100bytesthedatawi llbe
sentthroughthewirelessconnection.
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DwellTime(NumberofMillisecondsforPacketization)
ThisnumberrepresentsthetimetheESTeemwillholddataintheserialdatabufferbeforesendingtotheremoteESTeem.This
featureisgenerallyusediftheserialdatadoesnothaveaconsistentpacketlengthordelim i tercharacter.Forexample,ifthe
numberofm illiseconds issettoava
lueof10theESTeemwillmonitortheincomingserialdatastreamandanybreakincharacters
longerthan10millisecondswill causethedatawillbesentthroughthewirelessconnection.
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DelimiterCharacters
Enablingandspecifyi ngadelimitercharacterwi lltransmit thedataintheser i al bufferwhenthedelimitercharacterisrecognized
intheserial datastream.Therearetwouniquedelimitercharactersthatcanbeconfiguredandenabledindependently.
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ModemControlLines
Enabling this feature will allow the ESTeem in the Terminal Server mode to read and generate modem control lines to the
connecteddevice.