Raymarine RSW-Wired - 9.4 SeaTalkng power connection point

Productswhichhaveadedicatedpowersupplyconnectionthatare
connectedtotheSeaTalkng®backbonewillstillhaveanLENrating.Thisis
becauseproduct’sSeaTalkng®/NMEA2000internaltransceiverwillstillbe
poweredbytheSeaTalkng®backbone.
LENsareusedtodeterminethepowerconnectionpointfortheSeaTalkng®
backbone.
9.4SeaTalkng®powerconnectionpoint
Thepointalongthebackbonewherethepowerconnectionshouldbemade
isbasedonthelengthofthebackbone.
Note:
•Thepowerconnectionmustbeconnectedtoawhitespurconnectionon
thebackbone.
•DoNOTconnectthepowerconnectiontoabluebackboneconnector.
•ExcludingtheiTC-5,doNOTconnectthepowerconnectiondirectlyto
aproduct’swhitespurconnector.
Smallsystems
Ifthebackbonelengthis60m(197ft)orless,thepowerconnectionpoint
maybeconnectedatanypointinthebackbone.
Largesystems
Ifthebackbonelengthisgreaterthan60m(197ft),thepowerconnection
pointshouldbeconnectedatapointthatcreatesabalancedcurrentdraw
fromeachsideofthebackbone.TheLoadEquivalencyNumber(LEN)isused
todeterminethepowerconnectionpointforthesystem.
IntheexampleabovethesystemhasanoverallLENof16,sotheoptimum
connectionpointwouldbetohave8LENeithersideoftheconnectionpoint.
9.5SeaTalkng®systemloading
Themaximumloading/LENforaSeaTalkng®systemdependsonthelength
ofthebackbone.
Unbalancedsystemloading:
•BackboneLength:0m(0ft)to20m(66ft)—MaximumLEN:40
•BackboneLength:>20m(66ft)to40m(131ft)—MaximumLEN:20
•BackboneLength:>40m(131ft)to60m(197ft)—MaximumLEN:14
Balancedsystemloading:
•BackboneLength:0m(0ft)to60m(197ft)—MaximumLEN:100
•BackboneLength:>60m(197ft)to80m(262ft)—MaximumLEN:84
•BackboneLength:>80m(262ft)to100m(328ft)—MaximumLEN:60
•BackboneLength:>100m(328ft)to120m(394ft)—MaximumLEN:50
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