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442703/B

201

ALocalconnection

BConnectiononremotedevice

CFemale9-pinD-Subminiatureconnector

DMale9-pinD-Subminiatureconnector

Note

RS-422communicationportscannotbeusedfor

synchronizationpurposes.Theportyouwishtousemust

besettoRS-232.

Relatedtopics

Cabledrawingsandspecications,page206

SettinguptheST90inasynchronizedsystem,page199

Synchronizationsequences

Inmanyapplications,thesynchronisationinterfaceisbasedonanRS-232serialport.

WhenyouconnecttwosystemsforsynchronisationusingCleartoSend(CTS)and

RequesttoSend(RTS),onesystemmustsetupasa"Master"andtheotherasa"Slave".

WhentheST90is"Master"inasystem,thesynchronizationcaneithertakeplaceinFree

runningmode,orinWaitforslavemode.

Slavemode

WhentheST90issetupinSlavemode,itmustreceiveatriggersignalfromaperipheral

systemeverytimetheST90isgoingtotransmit.Thistriggersignalisconnectedtoa

serialportontheProcessorUnit,andtheClearToSend(CTS)pinisusedtogivethe

ST90an"event"message.ThemessageisprocessedbytheST90software,anditwill(if

thepreviouspinghasbeennished)startthepingsequence.

Asanacknowledgementtothesynchronizationtrigger,theST90setstheReadyToSend

(RTS)signaltoalogic"low"beforetransmitting.ThisindicatesthattheST90is"busy".

Oncethetransmissionandreceptionsequenceends,theST90setstheReadyToSend

(RTS)signaltoalogic"high"toindicatethatitisreadyforthenextping.

Mastermode

WhentheST90is"Master"inasystem,thesynchronizationcaneithertakeplaceinFree

runningmode,orinWaitforslavemode.

Cablelayoutandinterconnections

Simrad ST90 Installation Manual

Other manuals for Simrad ST90