Gadgetpool Seatalk nmea User manual

SeaTalk <-> NMEA

SeaTalk <-> RS232

Converter

Installation and Operation

Manual

To be used with AtMega1284p processor only

Hardware Version V 3.5

Software Version 2.00

Dec 2012

Contents

Credits / Warning / Disclaimer............................................................................................ 3

Function overview............................................................................................................... 3

NMEA Input..................................................................................................................... 4

Special NMEA-like configuration sentences.................................................................... 5

NMEA Output.................................................................................................................. 6

The $STALK sentence................................................................................................... 7

SeaTalk Input.................................................................................................................. 8

SeaTalk Output ............................................................................................................... 9

Collision detection.................................................................................................... 9

Same type of Data on NMEA & SeaTalk......................................................................... 9

SeaTalk Connection.......................................................................................................... 10

NMEA / RS232 Connection ...............................................................................................11

Input Jumper RS232..................................................................................................... 12

Input Jumper RS422..................................................................................................... 14

RS422 In -> RS232 Out................................................................................................ 15

Configuration settings....................................................................................................... 17

Options............................................................................................................................. 20

LCD Display.................................................................................................................. 20

Pushbutton.................................................................................................................... 21

Software update ............................................................................................................... 22

Bootstrap Loader Method.............................................................................................. 22

Circuit Diagram................................................................................................................. 23

SeaTalk & NMEA conversion Table .................................................................................. 24

Terminals & Connectors ................................................................................................... 25

ASCII Table....................................................................................................................... 27

Credits / Warning / Disclaimer

The Protocol converter is a

RESEARCH PROJECT.

It is used for research on data communication, computer communication and data

conversion on computers used on board boats.

Hard- and Software are still under development and have NOT been fully tested.

Malfunctions of the protocol converter and of any connected device are possible at any

time.

It is not an end user product and must not be used for navigation.

The protocol converter could cause damage to connected devices.

Liability cannot be accepted for any damages, personal injuries or malfunctions caused

by the converter.

There are no Seatalk technical specifications available from the manufacturer. I have used

the Technical Reference of the Seatalk protocol, compiled by Thomas Knauf GmbH.

See http://www.thomas-knauf.de/seatalk.htm .Thank you to Thomas Knauf for his work.

Do not use for navigation

An operating GSM mobile phone should not be placed within 2m of an

unshielded Seatalk/NMEA Bridge because of interference from the phone's

radio transmissions. If a phone is brought closer than this 2m distance, the

bridge may stop operating or data may become corrupted.

( Thank's John Blaiklock for testing )

Function overview

The converter interconnects two different data communication systems –SeaTalk

and

NMEA.

Information from the SeaTalk bus is transformed into NMEAData and sent to the

NMEA bus.

Information from the NMEAport is transformed into SeaTalk data and sent to the

SeaTalk bus.

Optionally information from both busses can be shown on a LCD display.

SeaTalk is Reg. Trademark of Raymarine Inc.

NMEA Input

Processing of NMEA data starts, when a complete NMEA sentence has been received.

If the received sentence contains a checksum, this checksum is used to check for

communication errors. If the checksum does not match the sentence, the received NMEA

sentence is discarded.

If the sentence does not contain a checksum, the sentence is always regarded as valid.

After complete reception of a NMEA sentence, this sentence is sent to the NMEA-Out port

of the converter Board and can be used by other NMEA devices.

(This function can be switched off by control setting –see below )

If the received sentence is known, the sentence information is extracted and processed. At

this time the following NMEA sentences can be received:

$xxRMC Speed over Ground, Course over Ground,

Latitude, Longitude, Time, Date

$xxVTG Course over ground

$xxGLL Position

$xxVHW Speed through water

$xxRMB Waypoint Information

$xxAPB Waypoint Information

$xxBWC Waypoint Information

$xxDBT Depth below transducer

$xxDPT Depth below keel

$xxMTW Water Temperature

$xxVLW Total / Trip Mileage

$xxHDM Heading magnetics

$xxHDG “ “

$xxZDA Date & Time

$xxVTG Ground speed

$xxVHW Compass

$xxVLW Trip mileage, Total mileage

$xxMWV Wind angle Wind Speed

$xxVWR Relative Wind Speed and Angle

Special NMEA-like configuration sentences

$STALK Special SeaTalk datagram

$SNBSE Board configuration

$COLCO SeaTalk Bus collision counter

$SWUPDATE Update board to new firmware

$SWVERSION Display firmware version number

Example

Enter : $SWVERSION<ENTER>

Result : SWVERSION*72

With LCD

$STVER,2.00,BRIDGE*45

2.00 = This board has Software Version 2.00

With LCD = Software is for board with LCD Display

BRIDGE = This Software is for SeaTalk Nmea BRIDGE

Example

Enter : $COLCO*45

Result: $IICOLLISIONS,000*11

$IIERRORS,0*27

No SeaTalk collisions so far.

No Buffer overflow errors so far.

NMEA Input

SeaTalk Input

NMEA Output

SeaTalk -> NMEA

translation

NMEA Output

All valid NMEA sentences –whether processed by

the converter or not –are forwarded to the NMEA-

Out port.. If the NMEA-Out port is busy, the

sentence is temporarily stored in memory and

transmitted as soon as the NMEA-Out port

becomes free.

The converter also continuously checks for new incoming SeaTalk data.

Incoming SeaTalk data is converted to NMEAData and transferred to the NMEA-Out Port.

The following NMEA sentences will be generated from incoming SeaTalk data :

$IIDBT Depth below transducer

Optional $IIDPT can be sent instead of $IIDBT

$IIVHW Speed t. Water

$IIMTW Water Temperature

$IIVLW Total / Trip Mileage

$IIMWV Apparent Wind angle & Wind speed

$IIMWV True Wind angle & Wind speed

$IIHDM Heading compass

$IIRMC Speed over ground, Course over ground,

Latitude, Longitude, UTC time, Date

Optional an additional $IIGLL sentence can be

sent for position information

$IIRSA Rudder angle

$STALK special SeaTalk datagram

$SNBSE special system configuration datagram

The $STALK sentence

The converter can process a special NMEA-like sentence.

With this special sentence any SeaTalk command can be sent to SeaTalk.

$STALK,cc,p1,p2..,pn*xx

cc = SeaTalk Command

p1 = Parameter1

p2 = Parameter 2

*xx = NMEAchecksum ( optional ) .

This special sentence will be sent to the NMEA Bus for every received SeaTalk datagram

–regardless as to whether it was recognised and processed or not.

( This function can be switch off by control setting –see below )

SeaTalk Input

NMEA Output

SeaTalk -> NMEA

translation

SeaTalk Input

When a SeaTalk datagram is received the system checks if this datagram is known and

can be processed. When the datagram is known, all parameters are extracted and stored.

Any unknown datagram is ignored.

(Exception: $STALK is sent even for unknown datagrams)

At this time the following SeaTalk datagrams are known.

00 Depth

10 Wind angle

11 Wind speed

20 Speed through water

21 Trip mileage

22 Total mileage

23 Water temperature

25 Total & trip mileage

26 Speed through water

27 Water temperature

30 Lamp brightness

50 Latitude

51 Longitude

52 Speed over ground

53 Course over ground

54 UTC time

56 Date

58 Latitude & Longitude

84 Compass heading

89 Compass ST40 heading

9C Compass heading & rudder position

NMEA Input

SeaTalk Output

NMEA -> SeaTalk

translation

SeaTalk Output

The converter periodically checks if any new data has arrived from NMEA, which have to

be sent to SeaTalk. New data is written to the SeaTalk bus only if the bus is not in use by

any other instrument. If the bus is in use, the converter waits for a while, and tries again.

Collision detection

Every single bit sent out to the SeaTalk bus is read back again and checked for successful

transmission. If the transmission was corrupted, the transmission is stopped immediately.

When the bus becomes free, the transmission will be started again.

At this time the following SeaTalk datagrams can be sent

00 Depth

10 Wind angle

11 Wind speed

20 Speed through water

25 Total & Trip mileage

27 Water temperature

30 Lamp intensity

50 Latitude

51 Longitude

52 Speed over ground

53 Course over ground

54 Time

56 Date

82 Target Waypoint Name

85 Navigation to Waypoint information

89 Compass ST40 heading

Same type of Data on NMEA & SeaTalk

Information available from like instruments on both Busses ( SeaTalk & NMEA ) are not

converted.

Example:

We have a depth sounder on the SeaTalk Bus and another depth sounder on the NMEA

bus.

So, on both sides depth information is available.

In this case no depth information in transferred from one bus to the other.

( If depth information is not updated within 30 sec. on one bus, sending to the other bus is

activated again. )

SeaTalk Connection

+12V DATA GND

There is a 3-Pin terminal for the connection to the SeaTalk bus.

Please double check for correct connection.

The board takes it’s power supply from +12V and GND.

+12V & GND MUST be connected, even if the SeaTalk bus is not needed.

A wrong connection could damage the converter or other devices on

the SeaTalk Bus.

RS232 / RS422

Jumper

Receive

RS422

RS232

Receive RS422 (NMEA)

Receive RS232

NMEA / RS232 Connection

Choosing RS232 <-> RS422

The Serial IN ports can be used as RS232 or RS422 port by setting a jumper.

RS232 setting is used for connecting a PC, a notebook, a GPS mouse, a Garmin GPS, or

any other device with a RS232 port.

RS422 is used for standard NMEA devices.

Standard NMEA devices have terminals marked with NMEA IN+, NMEA IN-, while RS232

devices usually have RxD, TxD .

Please double check the correct Jumper setting before usage.

Only 1 input port must be used at a time.

Either RxD + GND with Jumper setting RS232

Or IN+/IN- with Jumper setting RS422

It is not possible to use both Input ports at the same time.

Both Output port are always enabled. The SeaTalk NMEA Bridge always sends data to the

RS232 Port and to the RS422 Port

You can - for example - send data from the SeaTalk NMEA Bridge to a Computer and a

GMDSS Radio.

Input Jumper RS232

= Jumper

GND TxD RxD

In this setting the terminals marked RxD and GND and are used for NMEA input.

The bridge sends NMEAData to the Ports TxD/GND and

NMEA OUT+/NMEA OUT-

Example : Sending & Receiving SeaTalk Data to/from a Computer

In this configuration SeaTalk

Data can be received from the

Computer AND the computer

can send Data to the SeaTalk

bus.

Example : Connecting a Garmin GPS, and Computer and the SeaTalk Bus.

In this configuration the GPS

sends Data to the Computer

AND to the SeaTalk bus.

The Computer can only

receive Data from the GPS

and from the SeaTalk bus. It

can not send any data.

GPS with RS232 ( Garmin)

Seatalk<-> NMEA

Bridge

TxD

GND

Computer

RxD Gnd

GND

SeaTalk

Device

RS232

NMEA OUT GND

RxD

Seatalk<-> NMEA

Bridge

TxD

GND

Computer

RxD TxD Gnd

SeaTalk

Device

RS232

RxD

Input Jumper RS422

= Jumper

GND

NMEA IN -

NMEA IN +

NMEA OUT +

NMEA OUT -

In this configuration the terminals NMEA-IN+ and NMEA-IN- are used to receive NMEA

Data.

The bridge sends NMEAData out to the Ports TxD/GND and

NMEA OUT+/NMEA OUT-

The terminal “RS232-RxD” must not be used.

On some devices the NMEA terminals are labelled with Aand Binstead of +and –

On some devices the NMEA terminals + and –are even reversed. If communication can

not be established, just try to swap NMEA + and NMEA - . Swapping NMEA+ and NMEA -

only results in communication failure.

!! Please check your manual before connecting!!

RS422 In -> RS232 Out

You can use the SeaTalk NMEA Bridge to connect a RS422 device to an RS232

computer.

Use Jumper settings for RS422.

Data input comes from RS422 IN+/IN-, Data output is sent to RS232-TxD and RS422

Out+/Out-. Of course SeaTalk Data can also be read and sent.

NMEA Talker

eaTalk

Nmea

Bridge

RS422

connec

tion

IN +

TxD

GND

Computer

RxD Gnd

NMEA Listener

GND

SeaTalk

Device

RS232

OUT+ OUT- GND

RS232 In -> RS232 & RS422 Out

Since Output is always routed to both out-ports, you can connect two different devices to

the output ports.

In this example the

GPS sends Data to the

SeaTalk Bus and to the

computer and to a

GMDSS radio.

Computer and GMSDD

Radio receive data from

GPS and from SeaTalk

instruments.

SeaTalk Instruments

receive data from other

SeaTalk instruments and

from GPS.

The computer cannot send

any data.

Garmin GPS

SeaTalk <->NMEA

RS232

connec

tion

RxD

GND

TxD

GND

Computer

SeaTalk

Device

RS232

NMEA OUT GND

OUT+ OUT- GND

RS422

GMSDD

Radio

RxD

GND

IN + IN- GND

Configuration settings

The SeaTalk NMEA converter can be configured to meet the users requirements.

The configuration is made by sending a NMEA-like sentence. The settings are stored in an

EEProm.

The configuration sentence is :

$SNBSE,address,data<CR><LF>

(Optionally a Checksum can be appended $SNBSE,address,data*XX<CR><LF>)

( SNBSE = Seatalk NMEA Bridge Set Eeprom )

Configuration settings a read, when the bridge gets switched on. So when you change the

configuration, you need to switch it off/on to activate the changes.

How to set the configuration :

Connect the bridge to a PC.

Open a terminal programm ( i.e. hypertern ) and set it to 4800 Baud, 8 Bit, no parity, no

handshake.

Type “ $xxx “ and press ENTER

Bridge responds with “ $xxx “. When you receive the $xxx, connection to your bridge is

ok. If $xxx does not appear after you pressed ENTER, check connection, setting of Com-

Port, Baudrate etc.

Example :

In this example, we configure the bridge, so that every incoming SeaTalk sentence

will be sent to the PC as $STALK,xx,yy sentence.

In your terminal programm enter

$SNBSE,0,1

The bridge will respond with

$SNBSE,0,1

Next time you switch the bridge on, it will send every incoming SeaTalk sentence to

the PC as a $STALK,xx,yy,zz … sentence.

Address

Data

1 = Send out every incoming SeaTalk datagram as "$STALK....." to NMEA

0 = Do not generate $STALK,xx,yy sentence for each incoming SeaTalk

datagram If you don’t really need this function – better switch if OFF.

It causes additional load on the NMEA Bus.

Set NMEA Port Baudrate

1 = 300 Baud

2= 600 Baud

3= 1200 Baud

4 = 2400 Baud

5 = 4800 Baud ( Default )

6 = 9600 Baud

7 = 19200 Baud

8 = 38400 Baud

any other value defaults to 4800 Baud

Baud rate is changed at next start of the converter

Warning :

The baud rate selected is also the baud rate used for any further

configuration.

If your configuration program cannot handle the selected baud rate, there is

no way to reconfigure the device.

2,3,4,5

N.A.

6+7

Prefix for generated NMEASentence - Character 1+2

Every NMEASentence generated from the system begins with this two

letters

Default = “II” ( Integrated Instrumentation )

WARNING You have to enter theASCII Value of the character, not the

character itself.

Example : To set character 1 to “I” and character 2 to “A”

$SNBSE,2,73 ( Character “I” is a 73 in ascii )

$SNBSE,3,65 ( Character “A” is a 65 in ascii ) See Ascii Table

1= Echo every incoming NMEA Sentence

0 = Do not echo incoming NMEAsentences

N.A:

1 = Send $IIVHW Sentence when new Data from SeaTalk arrives

0 = Do not send $IIVHW Sentence

1 = Send $IIHDM Sentence when new Data from SeaTalk arrives

0 = Do not send $IIHDM Sentence

1 = Send $IIMWV Sentence when new Data from SeaTalk arrives

0 = Do not send $IIMWV Sentence

1 = Send $IIDBT Sentence when new Data from SeaTalk arrives

0 = Do not send $IIDBT Sentence

1 = Send $IIMTW Sentence when new Data from SeaTalk arrives

0 = Do not send $IIMTW Sentence

1 = Send $IIVLW Sentence when new Data from SeaTalk arrives

0 = Do not send $IIVLW Sentence

0 = Don’t send Display light on/off to SeaTalk Bus

1 = Send Display light on/off to SeaTalk Bus

1 = Send welcome message to NMEA Port after power up

0 = Do not send welcome message

0 = Speed over Ground from NMEA input is sent to SeaTalk bus as Speed

over Ground and as Speed through Water ( Needed for ST60 Wind

instrument, that does not recognise Speed Over Ground )

1 = Normal operation. No special SOG => STW handling ) ( default )

( See Webpage www.gadgetPool.de for more on this special ST60 Wind function )

0 = Every incoming SeaTalk datagram is sent to NMEA as "$STALK,xxx,yyy

–no matter if the system can interpret the SeaTalk data or not.

1 = Normal operation. Only SeaTalk sentences known to the system are

echoed as $STALK,xxx,yyy

Only valid if Address “0” is switch on.

0 = Don’t send any data to the SeaTalk Port. SeaTalk Port is READ-ONLY

0 = Display wind speed in knots. 1= Display wind speed in m/s

0 = Don’t send SOG to SeaTalk 1 = Send SOG to SeaTalk

0 = Don’t send Position to SeaTalk 1= Send Position to SeaTalk

0 = Display depth on SeaTalk instrument in feed,

1 = display in Meters

0= set time from RMC ... (only valid at position fix)

1= set time only from ZDA sentence

0=send only RMC sentence for position

1=send GLL and RMC sentence for position

27+28 Offset of depth transducer. In mm ( +- 1000th Meter )

If this value is set to -1, the bridge will send DBT NMEA Sentence and no

offset will be used.

If this values is set to something between -32000 to 32000, the bridge will

produce DPT sentences including the offset.

Reserved. ( Used for SeaTalk NMEALink )

1 = send Nmea RSA sentence for rudder angle data

0 = dont send RSA sentence

31,32

Reserved. Not used for SeaTalk Nmea Bridge

0= Course over Ground from NMEA input is also sent to SeaTalk bus as

compass course

1 = Normal operation. No special COG => CMAG handling ) ( default )

34,35

Reserved. Not used for SeaTalk Nmea Bridge

0 = Do not calculate TRUE Wind data. Send only apparent wind data.

1 = Calculate TRUE Wind data and send as $IIMWV sentence.

Options

The NMEA SeaTalk converter is normally used without any visualisation or user input.

Optionally however, a LCD Display and a Pushbutton can be connected.

In standard mode –without LCD and Pushbutton –the board consumes less power and

data conversion is faster than with LCD.

LCD Display

If data visualisation is needed, a 4x20 character LCD Display Type

„LCD Modul EA-DIP204-4“ can be connected.

It is available from

Conrad Elektronik - www.conrad.de Part No. 181863-14

Electronic Assembly GmbH http://www.lcd-module.de/

Display illumination can be switched on/off by a pushbutton or by SeaTalk command.

The display shows:

Page 1: Speed through water, Speed over ground

Depth, Temperature

Position Long. Track

Position Lat.

Page 2: App. Wind Speed. App. Wind Direction

Compass Track

Trip Miles UTC-Time

Total Miles

Page 3: Route FROM Waypoint Name Route TO Waypoint Name

Heading to WP Current Bearing

Distance to WP X-Track Error

Page 4: Speed over ground in BIG-Digits.

The displayed values are blanked out if no new data has been received for more than 30

seconds.

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