Page 1
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.
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NMEA Bridge Operation and Installation Handbook
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NMEA BRIDGE
Operation and
Installation
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NMEA Bridge Operation and Installation Handbook
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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
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Chapter 1: Introduction
SeaTalk is the language used by all Autohelm products to share
information. This is unique to Autohelm. The NMEA Bridge, by
providing conversion between SeaTalk and NMEA 0183 data
format, allows operation with other manufacturer's equipment .
The NMEA Bridge provides:
• Conversion of NMEA 0183 data formats to SeaTalk
• Conversion of SeaTalk to NMEA 0183 format
• Operation of the Autohelm Main Alarm when an alarm
condition exists on the SeaTalk bus
• RS232 terminals to send NMEA data to a personal computer
(echoes NMEA out)
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Chapter 2: Mounting
Select a suitable location that is:
• away from direct contact with water
• clean and grease-free
• accessible for cabling
• reasonably well protected from physical damage.
1. Once a suitable location has been found, thoroughly clean
the surface with an alcohol based cleaner.
2. Remove the protective backing from the NMEA Bridge and
firmly press onto the mounting surface.
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NMEA Bridge Operation and Installation Handbook
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D434-2
3. Alternatively, the NMEA Bridge may be attached using the 2
self tapping screws provided.
4. Remove the top of the Bridge by squeezing the lid at each
end and pull away from the base.
5. Route all the necessary cables into the Bridge.
6. Connect the wires as described in section 3. Also, secure
cables close to the unit.
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Chapter 3: Operation/Wiring
3.1 NMEA Output
Providing you have the appropriate SeaTalk instrumentation, the
data listed below is transmitted in NMEA 0183 format for use
with non-SeaTalk equipment.
Note: NMEA is also output in response to NMEA input.
Data Transmitted NMEA Header
Apparent Wind Angle MWV, VWR
Apparent Wind Speed MWV, VWR
Autopilot Alarms PNATD
Bearing to Waypoint BWC
Course Over Ground (M) VTG
Cross Track Error APB, XTE
Date ZDA
Depth DBT
Distance (Log) VLW
Distance (Trip) VLW
GPS Fix/No Fix GGA, GLL
GPS HDOP GSA, GGA
GPS PDOP GSA
Dead Reckoned XTE XTR
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Data NMEA Header
GPS Satellite Azimuth GSV
GPS Satellite Elevation GSV
GPS Satellite PR Number GSV
GPS Satellite SNR GSV
GPS Differential Station ID GGA
GPS Differential AGE GGA
GPS Number of Satellites GGA
GPS Antenna Height GGA
GPS Quality Indicator GGA
Heading (Magnetic or True) HDM, HDG, VHW, HDT
Latitude & Longitude GGA, GLL*
Locked Heading HSC
MOB (Cancel) PNATA
Route WPL
Speed Over Ground VTG
Speed Through water VHW
Temperature, Water MTW
Time ZDA
Time Offset ZTG
True Wind Angle MWV
Variation HDG
Waypoint Destination No. APB, BWC
Waypoint Arrival Alarm APB, AAM
Waypoint Distance BWC
Waypoint Time To Go ZTG
* GLL version 1.5 is transmitted if version 1.5 is received via
NMEA. If GLL version 2.0 is received via NMEA, GLL version
2.0 will be transmitted.
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Cabling
The NMEA Bridge should be connected to SeaTalk and the
other manufacturer's equipment as follows:
D1771-1
NMEA
SEATALK
ALARM
OUT
+ –
Screen (0v)
Yellow (Data)
Red (v+)
Red
(v+)
Screen
(0v)
+
-
Power
5A
IN
+ –
OUT
+ –
RS232
SEATALK
NMEA
+ –
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3.2 NMEA Input
The NMEA Bridge can also be used to convert NMEA 0183 data
to SeaTalk. NMEA 0183 data is also re-transmitted on NMEA
"OUT" in response to NMEA "IN". This allows non-SeaTalk
equipment to be connected directly to the SeaTalk bus.
Note: Data will not be transmitted to SeaTalk if it is already on
present on the SeaTalk bus.
Data Received NMEA Header
Apparent Wind Angle MWV, VWR
Apparent Wind Speed MWV, VWR
Bearing to Waypoint APB, BWR, BWC,
RMB, BER, BEC
Course Over Ground (M) VTG, VTA, RMC, RMA
Cross Track Error APB, XTE, APA,
RMB, XTR
Date ZDA, RMC
Depth DBT, DPT
Distance (Log) VLW
Distance (Trip) VLW
GPS Fix/No Fix GGA, GSA
GPS HDOP GGA, GSA
GPS PDOP GSA
GPS Satellite Azimuth GSV
GPS Satellite Elevation GSV
GPS Satellite PR Number GSV
GPS Satellite SNR GSV
GPS Differential Station ID GGA
GPS Differential AGE GGA
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Data NMEA Header
GPS Number of Satellites GGA
GPS Antenna Height GGA
GPS Quality Indicator GGA
Heading (Magnetic or True) HDM, HDG, VHW,
HDT
Latitude & Longitude GGA, GLL (inc. Version 1.5)
RMC, RMA,
IMA, GLP, GOP, GXP,
GDP
MOB (Cancel) PNATA
Route WPL
Speed Over Ground VTG, VTA, RMC, RMA
Speed Through water VHW
Temperature, Water MTW
Time ZDA, GLL, ZFO, ZTG
True Wind Angle MWV
Variation HDG, HVM, RMC,
RMA, HVD
Waypoint Destination No. APB, BWR,
BWC, RMB,
BOD, WCV, BER, BEC
Waypoint Arrival Alarm APB, APA, AAM
Waypoint Distance BWC, BWR
RMB, BER, BEC
Waypoint Lat & Lon BWC, BWR, BEC, BER
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Waypoint Capture WPL
Waypoints, last one & next 4 PNATA
Cabling (ST1,2,3000 autopilots)
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NMEA Bridge Operation and Installation Handbook
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D1770-1-1
Screen (0v)
Yellow (Data)
Screen
(0v)
NMEA
SEATALK
ALARM
OUT
+ –
IN
+ –
OUT
+ –
RS232
SEATALK
NMEA
+ –
+
--
Red (12V)
5A Fuse
3.3 Main Alarm
The NMEA Bridge can be used to drive the Autohelm Main
Alarm (Cat No Z035). This alarm will sound as soon as one of
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the following alarms is present on the SeaTalk bus:
• Deep Depth
• Shallow Depth
• Autopilot off course
• Watch alarm*
• Wind shift*
• Low battery*
• Large Cross Track Error*
• No NMEA data*
• NMEA Data error*
• No autopilot Main power
• No autopilot actuator (Drive stopped)*
• Stern drive auto release
• Waypoint advance*
*The Main Alarm will sound 30 seconds after the instrument
alarm. This allows the alarm condition to be cancelled and,
therefore, avoiding sounding of the main alarm.
Cabling
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The Main Alarm should be wired to the NMEA Bridge as follows:
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
The NMEA Bridge can be used to send or receive NMEA data to
or from a personal computer via the "RS232 OUT and NMEA
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IN" terminals, as shown in the following illustrations.
D1772-1
NMEA
SEATALK
ALARM
OUT
+ –
Screen (0v)
Red (v+)
Red
(v+)
Screen
(0v)
+
-
Power
5A
IN
+ –
OUT
+ –
RS232
SEATALK
NMEA
+ –
Yellow (Data)
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PC Serial Port Connections to NMEA
The following diagram shows the pin connections for 25 and 9
pin PC serial ports to NMEA.
2
Ground
Receive
Transmit
3
7
2
Ground
Receive
Transmit
3
5
DB25 25 PIN
SERIAL CONNECTOR
DB9 9 PIN
SERIAL CONNECTOR
D1773a-1
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NMEA Bridge Operation and Installation Handbook
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Chapter 4: Fault Finding
All Autohelm products are comprehensively tested procedure
prior to packing and shipment. In the unlikely event that a fault
does occur, the following check list should help cure the
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.
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