Name: Simrad EK80
Brand: Simrad
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136

394149/C

RS-422providesamechanismfortransmittingdataupto10Mbits/s.Thisinterfaceformat

usesabalancedsignalontwowires.Thisincreasesboththemaximumbaudrateandthe

physicallengthofthecable,anditreducesthenoise.Withahighqualitycable,youcan

useRS-422ondistancesupto1500meterseveninnoisyenvironments.RS-422isalso

speciedformulti-dropapplications.Thismeansthatonetransmittercansenddatato

upto10receivers.

Note

TherearenocommonstandardforRS-422pinconguration.Anymanufacturermay

choosetheirownconnectorpinsforthevarioussignalsused.InordertomaketheRS-422

connectiontoyourperipheraldeviceworkproperly,youmustalwaysconsulttherelevant

instructionsprovidedbythedevicemanufacturer.

ForemoreinformationabouttheRS-422serialcommunicationstandard,see(forexample):

•https://en.wikipedia.org/wiki/RS-422

RS-485serialcommunication

RS-485(alsoknownasTIA-485–A)isastandarddeningtheelectricalcharacteristics

ofdriversandreceiversforuseinbalanceddigitalmultipointsystems.Thestandardis

publishedbytheTelecommunicationsIndustryAssociation/ElectronicIndustriesAlliance

(TIA/EIA).DigitalcommunicationsnetworksimplementingtheRS-485standardcanbe

usedeffectivelyoverlongdistancesandinelectricallynoisyenvironments.Multiple

receiversmaybeconnectedtosuchanetworkinalinear,multi-dropconguration.

RS-485offersdatatransmissionspeedsof35Mbit/supto10mand100kbit/sat1200

m.Sinceitusesadifferentialbalancedlineovertwistedpair(likeRS-422),itcanspan

relativelylargedistances(typicallyupmaximum1200m).IncontrasttoRS-422,which

hasasingledrivercircuitwhichcannotbeswitchedoff,RS-485driversneedtobeput

intransmitmodeexplicitlybyassertingasignaltothedriver.ThisallowsRS-485to

implementlinearbustopologiesusingonlytwowires.Theequipmentlocatedalongasetof

RS-485wiresareinterchangeablycallednodes,stationsordevices.

RS-485,likeRS-422,canbemadefull-duplexbyusingfourwires.SinceRS-485isa

multi-pointspecication,however,thisisnotnecessaryinmanycases.

Note

TherearenocommonstandardforRS-485pinconguration.Anymanufacturermay

choosetheirownconnectorpinsforthevarioussignalsused.InordertomaketheRS-485

connectiontoyourperipheraldeviceworkproperly,youmustalwaysconsulttherelevant

instructionsprovidedbythedevicemanufacturer.

SimradEK80

Simrad EK80 Installation Manual

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