NetComm IG6000 Network Router User Manual


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IndustrialModemUserGuide
YML3913A 11
Operating Modes
AsynchronousMode
AsynchronousModeisthenormaldefaultmodeofthemodem.Control andmonitoringisperformedbyexecuting
theATcommandsusingaPCfittedwithsuitablecommunicationssoftware.
SynchronousOperation
Yourmodemsupportstwosynchronousmodes.Mode1allowsoperationwithcomputerswhichsupport
asynchronousandsynchronouscommunicationonasingleRS232port.Mode2allowsyourmodemtobe
operatedwithdedicatedsynchronousterminals.
Althoughyourmodemcanonlyoperateoverasingletwowireconnection,itwillstillperformfullduplex
synchronouscommunication.HalfduplexoperationcouldbesimulatedbycontrollingthestateoftheRTSand
CTSsignals.
TerminalSpeeds
Yoursynchronousterminalorhostshouldusetheclocksignalsprovidedbythemodemtosynchronisetransmit
andreceivedata.Theclockspeedwillrepresenttheactualconnectionspeedofthemodem.
+ Whensynchronousmodeisselected,yourmodemcannotoperateinconstantspeedmodeorusetheerror
correctionordatacompressionfacilitiesofthemodem.Onlyvariablespeedmodeisavailable insynchronous
connections(thisreferstothemodem'sterminalspeed).
LineSpeeds
Yourmodemsupportsanumberofsynchronouslinespeeds.
Whenoperatinginsynchronousmode,yourmodemshouldalwaysbeconfiguredwithalocked,nonautoranging
Bsetting(thisreferstomodemlinespeed).
ForV.34,theBsettingonlysetsthemaximumspeed.Themodemwillautomaticallydeterminethehighestusable
speedfortheline.
SynchronousMode1
Synchronousmode1isselectedwiththe&M1command.
· Type:AT&M1<E>
Yourmodemwillentersynchronousmodewheneveritsuccessfullyconnectstoaremotemodem.
Youshouldalso:
· Type:AT&D2<E>
ThisallowshangupviayourcomputerÕsDTRsignal.
Toreturntoasynchronousoperation:
· Type:AT&M0<E>
SynchronousMode2
Synchronousmode2isselectedwiththe&M2command.
· Type:AT&M2<E>
Yourmodemwillentersynchronousmodewheneveritsuccessfullyconnectstoaremotemodem.
Youshould also:
· Type:AT&D2<E>
Thisallowsyoutodialandhangup.
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