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' Autohelm Raymarine: Z290 Nmea Bridge Z290 Bridge Between Sea Talk And Nmea Buses'



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       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.
NMEA Bridge Operation and Installation Handbook   1




               NMEA BRIDGE
                Operation and
                 Installation
NMEA Bridge Operation and Installation Handbook                      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
4   NMEA Bridge Operation and Installation Handbook
NMEA Bridge Operation and Installation Handbook                  5


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)
6                   NMEA Bridge Operation and Installation Handbook



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.
NMEA Bridge Operation and Installation Handbook                  7




                                            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.
8                 NMEA Bridge Operation and Installation Handbook


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
NMEA Bridge Operation and Installation Handbook                   9

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.
10                                     NMEA Bridge Operation and Installation Handbook

Cabling
The NMEA Bridge should be connected to SeaTalk and the
other manufacturer's equipment as follows:

                                       NMEA SEATALK ALARM
                  RS232 SEATALK NMEA
          + 




                                                             + 
            OUT
          + 




                                                             + 
            OUT




                                                            IN




                                                                                   Red                 Screen
                                                                                   (v+)       5A        (0v)
                                                                   Yellow (Data)
                                                                   Screen (0v)            +        -
                                                                    Red (v+)              Power

                                                                                                         D1771-1
NMEA Bridge Operation and Installation Handbook                     11

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
12               NMEA Bridge Operation and Installation Handbook

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
NMEA Bridge Operation and Installation Handbook    13

Waypoint Capture                             WPL
Waypoints, last one & next 4        PNATA

Cabling (ST1,2,3000 autopilots)
14                  NMEA Bridge Operation and Installation Handbook




                                                                            Yellow (Data)
                                                                            Screen (0v)

       Screen
        (0v)
                                                NMEA SEATALK ALARM
                           RS232 SEATALK NMEA
                   + 




                                                                      + 
                     OUT




  --
  +
                   + 




                                                                      + 
                     OUT




                                                                     IN




                Red (12V)
                5A Fuse



                                                                                            D1770-1-1




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
NMEA Bridge Operation and Installation Handbook               15

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
16                                                       NMEA Bridge Operation and Installation Handbook

The Main Alarm should be wired to the NMEA Bridge as follows:




                                                                           Black
                                                                           Red
                                                                         Main Alarm
                                                                           Z035
                                    NMEA SEATALK ALARM
               RS232 SEATALK NMEA
       + 




                                                          + 
         OUT
       + 




                                                          + 
         OUT




                                                         IN




                                                                                         Red                 Screen
                                                                                         (v+)       5A        (0v)
                                                                         Yellow (Data)
                                                                         Screen (0v)            +        -
                                                                          Red (v+)              Power

                                                                                                               D1769-1




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
NMEA Bridge Operation and Installation Handbook                                                               17

IN" terminals, as shown in the following illustrations.




                                                                                   Red                 Screen
                                                                                   (v+)       5A        (0v)

                                                                                          +        -
                                               NMEA SEATALK ALARM
                          RS232 SEATALK NMEA
                  + 




                                                                     + 
                    OUT




                                                                                          Power
                  + 




                                                                     + 
                    OUT




                                                                    IN




                                                                           Yellow (Data)
                                                                           Screen (0v)
                                                                           Red (v+)

                                                                                                         D1772-1
18                NMEA Bridge Operation and Installation Handbook

PC Serial Port Connections to NMEA
The following diagram shows the pin connections for 25 and 9
pin PC serial ports to NMEA.


       2               Transmit          2               Receive
       3               Receive           3               Transmit


                                         5               Ground
       7               Ground



            DB25 25 PIN               DB9 9 PIN
            SERIAL CONNECTOR          SERIAL CONNECTOR       D1773a-1
NMEA Bridge Operation and Installation Handbook                     19


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          Equipment not          Refer to the
 converted and          setup to               manufacturers
 transmitted onto       transmit correct       operating
 the SeaTalk bus.       NMEA sentences.        handbook.

                        NMEA Bridge            Check
                        incorrectly            connections.
                        wired.

                        Variable
                        information such
                        as XTE, bearing
                        to waypoint,
                        Lat/Lon already
                        on SeaTalk bus.


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