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ATMega1284P processor

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S e a Ta l k < - > N M E A

S e a Ta l k < - > R S 2 3 2

C o n v e r t e r

Installation and Operation

Manual

To be used with AtMega1284p processor only

Hardware Version

V 3.5

Software Version 2.00

Dec 2012

Summary of Contents for SeaTalk NMEA

Page 1: ...getPool de ATMega1284P processor 2004 2010 Alle Rechte vorbehalten FWallenwein gadgetPool de 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 ...

Page 2: ... 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 conv...

Page 3: ...eatalk 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 r...

Page 4: ...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 xx...

Page 5: ...O 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 Sea...

Page 6: ...inuously checks for new incoming SeaTalk data Incoming SeaTalk data is converted to NMEA Data 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 ...

Page 7: ...ecial 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 NMEA checksum 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 belo...

Page 8: ...eters 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 Spee...

Page 9: ... 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 informatio...

Page 10: ...tPool de 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 ...

Page 11: ...ort 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 GN...

Page 12: ... 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 NMEA Data to the Ports TxD GND and NMEA OUT NMEA OUT ...

Page 13: ...e 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 SeaTalk Device RS232 NMEA OUT GND ...

Page 14: ...nd NMEA IN are used to receive NMEA Data The bridge sends NMEA Data 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 A and B instead 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 co...

Page 15: ... 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 SeaTalk Nmea Bridge RS422 connec tion IN IN TxD GND Computer RxD Gnd NMEA Listener GND SeaTalk SeaTalk Device RS232 OUT OUT GND ...

Page 16: ...es 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 SeaTalk Device RS232...

Page 17: ...hen 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 connec...

Page 18: ...Character 1 2 Every NMEA Sentence generated from the system begins with this two letters Default II Integrated Instrumentation WARNING You have to enter the ASCII 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 8 1 Echo every incoming NMEA Sentence 0 ...

Page 19: ... Display wind speed in m s 22 0 Don t send SOG to SeaTalk 1 Send SOG to SeaTalk 23 0 Don t send Position to SeaTalk 1 Send Position to SeaTalk 24 0 Display depth on SeaTalk instrument in feed 1 display in Meters 25 0 set time from RMC only valid at position fix 1 set time only from ZDA sentence 26 0 send only RMC sentence for position 1 send GLL and RMC sentence for position 27 27 28 Offset of dep...

Page 20: ...play 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 Direc...

Page 21: ...ected the user can switch between two display pages Pressing the pushbutton for a short time approx 2 sec switches between the pages Pressing the pushbutton for a longer time approx 5 sec switches the display illumination on off Switching illumination on off can be transmitted to SeaTalk bus With this function the lights on all other instruments on the Seatalk bus can be remote controlled ...

Page 22: ...ontroller software yourself Bootstrap method advantages No Hardware programmer needed Just a RS232 connection to PC and a PC Software is needed Fuses and Bootstrap Software can not be erased accidentally Latest Software versions can be found at http www gadgetPool de Bootstrap Loader Method Set Jumpers to RS232 Connect the SeaTalk NMEA Bridge to your PC using RxD TxD and GND Start the supplied boo...

Page 24: ... temperature 23 MTW X Water temperature 27 MTW X X Total Trip mileage 25 VLW X X Wind angle 10 MWV VWR X X Wind speed 11 MWV VWR X X Compass 84 HDM VHW X Compass ST40 89 HDM X X Speed over ground 52 RMC X X Course over ground 53 RMC VTG X X Lamp intensity 30 X Pushbutton Latitude 51 RMC X X Latitude 51 GLL X Longitude 50 RMC X X Longitude 50 GLL X UTC time 54 RMC X X UTC time 54 ZDA X Date 56 RMC ...

Page 25: ... etc TxD RS232 Transmit Data Serial Data sent from bridge to a PC RxD RS232 Receive Data Serial Data received by the bridge from PC IN IN NMEA Data Input RS422 OUT OUT NMEA Data Output RS422 Terminal on the right side 12V 12 Volt Power Supply Plus Data SeaTalk In Output GND 12 Volt Power Supply Minus GND If you use the 5V output to power other devices please make sure that the chip 7805 has a heat...

Page 26: ... http www gadgetPool de ATMega1284P processor 2004 2010 Alle Rechte vorbehalten FWallenwein gadgetPool de News and Info on the web If you have any question or suggestions there is a SeaTalk NMEA Bridge forum on our web page http www gadgetPool de ...

Page 27: ...lten FWallenwein gadgetPool de ASCII Table Upper case letters Character Ascii Value A 65 B 66 C 67 D 68 E 69 F 70 G 71 H 72 I 73 J 74 K 75 L 76 M 77 N 78 O 79 P 80 Q 81 R 82 S 83 T 84 U 85 V 86 W 87 X 88 Y 89 Z 90 Lower case letters a 97 b 98 c 99 x 120 y 121 z 122 Digits 0 48 6 54 1 49 7 55 2 50 8 56 3 51 9 57 4 52 5 53 ...

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