Simrad ST90 - Page 206

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•Stand-alone
Synchronizationisturnedoff.Thissynchronizationmodeisusedifthe
ST90isworkingbyitselfandwithnosynchronizationrequired.Thisisthe
defaultsetting.TheST90operatesusingitsinternalpingintervalparameters,
independentofanytriggersignalsarrivingatthesynchronizationport.
TheSynchronizationDelaysettingisnotapplicablewhensynchronizationis
switchedoff.
•Master
MastermodeisusediftheST90isgoingtoactasthecontrollingunitina
synchronizedsystem.Theperipheralhydroacousticsystem(s)areonlypermitted
totransmitwhenenabledbytheST90.WhenMastermodeisselected,theST90
willrunusingitsinternalpingintervalparametersandsendtriggersignalstothe
peripheralsystem(s).
•Slave
SlavemodeisusediftheST90isgoingtotransmitonlywhenpermittedbya
peripheralsystem.WhenSlavemodeisselected,theST90doesnottransmit
("ping")unlessanexternaltriggerappearsonthechosensynchronizationport.
Theperipheralsystemmaybeanyotherhydroacousticproduct(forexamplean
echosounderorsonar),orevenadedicatedsynchronizationsystem.
7SelectSynchronizationDelay.
Thisdelayparameterisuseddifferentlydependingonthechosensynchronization
mode.
•Stand-alone
TheSynchronizationDelaysettingisnotapplicablewhensynchronizationis
switchedoff.
•Master
InMastermode,theST90waitsforthedelaytimeaftertheexternaltrigger
signalhasbeensenttotheslavesbeforetransmittingtheping.Thisisoften
referredtoasapre-trigger.
Note
Thisdelaywillonlyworkwhenthesynchronizationissetupusingaserialport.
•Slave
InSlavemode,theST90waitsforthedelaytimeaftertheexternaltriggersignal
hasarrivedbeforetransmittingtheping.Thisisoftenreferredtoasapost-trigger.
8Fromthelistofportsavailable,selectSynchronizationPort.
Thisistheinterfaceportcurrentlyusedtotransmitorreceivesynchronization
signals.ItmustbeanRS-232serialport.Sincethesynchronizationfunctiononly
usestheRequestToSend(RTS)andClearToSend(CTS)signalsonaserialport,
SimradST90InstallationManual