AUTOHELM NMEA BRIDGE User manual

Distributed by
Any reference to Raytheon or
RTN in this manual should be
interpreted as Raymarine.
The names Raytheon and RTN
are owned by the
Raytheon Company.

NMEABridgeOperationandInstallationHandbook 1
NMEABRIDGE
Operation and
Installation

NMEABridgeOperationandInstallationHandbook 3
Contents
Chapter 1: Introduction........................................ 3
Chapter 2: Mounting ............................................ 4
Chapter 3: Operation/Wiring................................ 6
3.1 NMEA Output .................................................. 6
3.2 NMEA Input ..................................................... 9
3.3 Main Alarm .................................................... 12
3.4 Connecting to a Personal Computer ................ 14
Chapter 4: Fault Finding .................................... 17

NMEABridgeOperationandInstallationHandbook
4

NMEABridgeOperationandInstallationHandbook 5
Chapter1:Introduction
SeaTalkisthelanguageusedbyallAutohelmproductstoshare
information.ThisisuniquetoAutohelm.TheNMEABridge,by
providingconversionbetweenSeaTalkandNMEA0183data
format,allowsoperationwithothermanufacturer'sequipment.
TheNMEABridgeprovides:
• ConversionofNMEA0183dataformatstoSeaTalk
• ConversionofSeaTalktoNMEA0183format
• OperationoftheAutohelmMainAlarmwhenanalarm
conditionexistsontheSeaTalkbus
• RS232terminalstosendNMEAdatatoapersonalcomputer
(echoesNMEAout)

NMEABridgeOperationandInstallationHandbook
6
Chapter2:Mounting
Selectasuitablelocationthatis:
• awayfromdirectcontactwithwater
• cleanandgrease-free
• accessibleforcabling
• reasonablywellprotectedfromphysicaldamage.
1. Onceasuitablelocationhasbeenfound,thoroughlyclean
thesurfacewithanalcoholbasedcleaner.
2. RemovetheprotectivebackingfromtheNMEABridgeand
firmlypressontothemountingsurface.

NMEABridgeOperationandInstallationHandbook 7
D434-2
3. Alternatively,theNMEABridgemaybeattachedusingthe2
selftappingscrewsprovided.
4. RemovethetopoftheBridgebysqueezingthelidateach
endandpullawayfromthebase.
5. RouteallthenecessarycablesintotheBridge.
6. Connectthewiresasdescribedinsection3.Also,secure
cablesclosetotheunit.

NMEABridgeOperationandInstallationHandbook
8
Chapter3:Operation/Wiring
3.1 NMEA Output
ProvidingyouhavetheappropriateSeaTalkinstrumentation,the
datalistedbelowistransmittedinNMEA0183formatforuse
withnon-SeaTalkequipment.
Note:NMEAisalsooutputinresponsetoNMEAinput.
Data TransmittedNMEAHeader
ApparentWindAngle MWV, VWR
ApparentWindSpeed MWV, VWR
AutopilotAlarms PNATD
BearingtoWaypoint BWC
CourseOverGround(M) VTG
CrossTrackError APB,XTE
Date ZDA
Depth DBT
Distance(Log) VLW
Distance(Trip) VLW
GPSFix/NoFix GGA,GLL
GPSHDOP GSA,GGA
GPSPDOP GSA
DeadReckonedXTE XTR

NMEABridgeOperationandInstallationHandbook 9
Data NMEAHeader
GPSSatelliteAzimuth GSV
GPSSatelliteElevation GSV
GPSSatellitePRNumber GSV
GPSSatelliteSNR GSV
GPSDifferentialStationID GGA
GPSDifferentialAGE GGA
GPSNumberofSatellites GGA
GPSAntennaHeight GGA
GPSQualityIndicator GGA
Heading(MagneticorTrue) HDM,HDG,VHW,HDT
Latitude&Longitude GGA,GLL*
LockedHeading HSC
MOB(Cancel) PNATA
Route WPL
SpeedOverGround VTG
SpeedThroughwater VHW
Temperature,Water MTW
Time ZDA
TimeOffset ZTG
TrueWindAngle MWV
Variation HDG
WaypointDestinationNo. APB, BWC
WaypointArrivalAlarm APB,AAM
WaypointDistance BWC
WaypointTimeToGo ZTG
*GLLversion1.5istransmittedifversion1.5isreceivedvia
NMEA.IfGLLversion2.0isreceivedviaNMEA,GLLversion
2.0willbetransmitted.

NMEABridgeOperationandInstallationHandbook
10
Cabling
TheNMEABridgeshouldbeconnectedtoSeaTalkandthe
othermanufacturer'sequipmentasfollows:
D1771-1
NMEA SEATALK ALARM
OUT
+ –
Screen (0v)
Yellow (Data)
Red (v+)
Red
(v+) Screen
(0v)
+-
Power
5A
IN
+ –
OUT
+ –
RS232 SEATALK NMEA
+ –

NMEABridgeOperationandInstallationHandbook 11
3.2 NMEA Input
TheNMEABridgecanalsobeusedtoconvertNMEA0183data
toSeaTalk.NMEA0183dataisalsore-transmittedonNMEA
"OUT"inresponsetoNMEA"IN".Thisallowsnon-SeaTalk
equipmenttobeconnecteddirectlytotheSeaTalkbus.
Note:DatawillnotbetransmittedtoSeaTalkifitisalreadyon
presentontheSeaTalkbus.
Data ReceivedNMEAHeader
ApparentWindAngle MWV, VWR
ApparentWindSpeed MWV, VWR
BearingtoWaypoint APB, BWR, BWC,
RMB,BER,BEC
CourseOverGround(M) VTG,VTA,RMC,RMA
CrossTrackError APB,XTE,APA,
RMB,XTR
Date ZDA,RMC
Depth DBT,DPT
Distance(Log) VLW
Distance(Trip) VLW
GPSFix/NoFix GGA,GSA
GPSHDOP GGA,GSA
GPSPDOP GSA
GPSSatelliteAzimuth GSV
GPSSatelliteElevation GSV
GPSSatellitePRNumber GSV
GPSSatelliteSNR GSV
GPSDifferentialStationID GGA
GPSDifferentialAGE GGA

NMEABridgeOperationandInstallationHandbook
12
Data NMEAHeader
GPSNumberofSatellites GGA
GPSAntennaHeight GGA
GPSQualityIndicator GGA
Heading(MagneticorTrue) HDM,HDG,VHW,
HDT
Latitude&Longitude GGA,GLL(inc.Version1.5)
RMC,RMA,
IMA,GLP,GOP,GXP,
GDP
MOB(Cancel) PNATA
Route WPL
SpeedOverGround VTG,VTA,RMC,RMA
SpeedThroughwater VHW
Temperature,Water MTW
Time ZDA,GLL,ZFO,ZTG
TrueWindAngle MWV
Variation HDG,HVM,RMC,
RMA,HVD
WaypointDestinationNo. APB, BWR,
BWC, RMB,
BOD,WCV,BER,BEC
WaypointArrivalAlarm APB,APA,AAM
WaypointDistance BWC, BWR
RMB,BER,BEC
WaypointLat&Lon BWC, BWR, BEC, BER

NMEABridgeOperationandInstallationHandbook 13
WaypointCapture WPL
Waypoints,lastone&next4 PNATA
Cabling (ST1,2,3000 autopilots)

NMEABridgeOperationandInstallationHandbook
14
D1770-1-1
Screen (0v)
Yellow (Data)
Screen
(0v)
NMEA SEATALK ALARM
OUT
+ –
IN
+ –
OUT
+ –
RS232 SEATALK NMEA
+ –
+
--
Red (12V)
5A Fuse
3.3MainAlarm
TheNMEABridgecanbeusedtodrivetheAutohelmMain
Alarm(CatNoZ035).Thisalarmwillsoundassoonasoneof

NMEABridgeOperationandInstallationHandbook 15
thefollowingalarmsispresentontheSeaTalkbus:
• DeepDepth
• ShallowDepth
• Autopilotoffcourse
• Watchalarm*
• Wind shift*
• Lowbattery*
• LargeCrossTrackError*
• NoNMEAdata*
• NMEADataerror*
• NoautopilotMainpower
• Noautopilotactuator(Drivestopped)*
• Sterndriveautorelease
• Waypointadvance*
*TheMainAlarmwillsound30secondsaftertheinstrument
alarm.Thisallowsthealarmconditiontobecancelledand,
therefore,avoidingsoundingofthemainalarm.
Cabling

NMEABridgeOperationandInstallationHandbook
16
TheMainAlarmshouldbewiredtotheNMEABridgeasfollows:
D1769-1
NMEA SEATALK ALARM
OUT
+ –
Screen (0v)
Yellow (Data)
Red (v+)
Red
(v+) Screen
(0v)
+-
Power
5A
Main Alarm
Z035
IN
+ –
OUT
+ –
RS232 SEATALK NMEA
+ –
Red
Black
3.4 Connecting a Personal Computer
TheNMEABridgecanbeusedtosendorreceiveNMEAdatato
orfromapersonalcomputerviathe"RS232OUTandNMEA

NMEABridgeOperationandInstallationHandbook 17
IN"terminals,asshowninthefollowingillustrations.
D1772-1
NMEA SEATALK ALARM
OUT
+ –
Screen (0v)
Red (v+)
Red
(v+) Screen
(0v)
+-
Power
5A
IN
+ –
OUT
+ –
RS232 SEATALK NMEA
+ –
Yellow (Data)

NMEABridgeOperationandInstallationHandbook
18
PC Serial Port Connections to NMEA
Thefollowingdiagramshowsthepinconnectionsfor25and9
pinPCserialportstoNMEA.
2
Ground
Receive
Transmit
3
7
2
Ground
Receive
Transmit
3
5
DB25 25 PIN
SERIAL CONNECTOR DB9 9 PIN
SERIAL CONNECTOR
D1773a-1

NMEABridgeOperationandInstallationHandbook 19
Chapter4:FaultFinding
AllAutohelmproductsarecomprehensivelytestedprocedure
priortopackingandshipment.Intheunlikelyeventthatafault
doesoccur,thefollowingchecklistshouldhelpcurethe
problem.
Fault Cause Action
No operation. No power supply. Check the
SeaTalk bus
connectors are
correct between
the Bridge and
the power
supply.
Check the
fuse/circuit
breaker.
NMEA data not
converted and
transmitted onto
the SeaTalk bus.
Equipment not
setup to
transmit correct
NMEA sentences.
NMEA Bridge
incorrectly
wired.
Variable
information such
as XTE, bearing
to waypoint,
Lat/Lon already
on SeaTalk bus.
Refer to the
manufacturers
operating
handbook.
Check
connections.