Simrad ST90 Installation Manual

442703/B
199
SettinguptheST90inasynchronized
system
Topics
Aboutsynchronization,page199
Synchronizationmodes,page199
SynchronizationusingClearToSend(CTS)andRequestT oSend(RTS)signals,page200
Synchronizationsequences,page201
SettinguptheST90inasynchronizedsystem,page202
Aboutsynchronization
Whenevermorethanonehydroacousticsystemareinstalledonavessel,interferencemay
occur.Withonlytwosystems,interferencecanbeavoidedifoneofthehydroacoustic
systemscancontrolthetransmissionsoftheothersystem.Ifmultiplesystemsare
used,theycanbeconnectedtoacommonsynchronisationsystemthatcontrolsallthe
transmissions.
Inphysics,interferenceisthephenomenoninwhichtwowavessuperposeeach
othertoformaresultantwaveofgreaterorloweramplitude.Interferenceusually
referstotheinteractionofwavesthatarecorrelatedorcoherentwitheachother,
eitherbecausetheycomefromthesamesourceorbecausetheyhavethesameor
nearlythesamefrequency.Interferenceeffectscanbeobservedwithalltypesof
waves,forexample,light,radio,acoustic,surfacewaterwavesormatterwaves.
https://en.wikipedia.org/wiki/Interference_(wave_propagation),April2016
TheSimradST90maybesetuptobesynchronizedwithotherhydroacousticinstruments.
Synchronizationisnecessarytopreventseveralhydroacousticsystemsfromtransmitting
simultaneously.Individualtransmissionisoftenanecessitytopreventinterference.
Relatedtopics
Cabledrawingsandspecications,page206
SettinguptheST90inasynchronizedsystem,page199
Synchronizationmodes
ThepurposeofthesynchronizationmodesaretosetuptheST90tooperatealone,orasa
"master"or"slave"inasynchronizedsystem.
Whenevermorethanonehydroacousticsystemisinstalledonavessel,interferencemay
occur.Toavoidinterference,youhavetheseoptions:
Cablelayoutandinterconnections

Simrad ST90 Specifications

General

Brand	Simrad
Model	ST90
Category	Sonar
Language	English