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Author Topic:   NMEA sentences

MTK posted 03-09-2007 11:02 AM ET (US)
Does anyone know if GPS NMEA 0183 sentences can be viewed on a computer, without any special software?

MTK posted 03-09-2007 12:03 PM ET (US)
Maybe in DOS?
MTK posted 03-09-2007 01:47 PM ET (US)
I found the answer to my own question @
http://www.maptech.com/support/forums/messages.cfm?threadid=145&threaded=no&sortby=messagenum&startrow=1
where2 posted 03-10-2007 12:50 AM ET (US)
The answer was YES, Use a terminal emulation software and look for an ascii stream coming in on a serial port at 4800bps, or 9600bps.
jimh posted 03-13-2007 02:28 PM ET (US)
Connecting the serial data output of a NMEA-2000 device to another serial data input is not particularly difficult to accomplish. It is fairly trivial. Once you have matched the serial data communication parameters, you will be able to see the serial data stream. However, that is just all you will see: a stream of seral data. You will not see "NMEA Sentences."
If you wish to be able to read NMEA sentences you will have to have some sort of intelligent device which is able to receive the serial data stream and analyze it. The device will have to be able to decode the stream into datagrams, then parse the datagrams for their content, and finally convert the content into something understandable by a human. This is not a trivial task.
You don't get to hook up to your serial port and see "Speed Over Ground is 4.6 knots."
where2 posted 03-13-2007 07:34 PM ET (US)
With all due respect to the webmaster, the original question was NMEA-0183 sentences. NMEA-2000 is a completely different interface.
No NMEA-0183 will not appear as "Speed over ground is 4.6kts", in your terminal emulation software but it should provide a readable sentence of data if you get your parameters set correctly. Typically, you will want to have a guide to help you parse out the sentence structure. Just as the meaning of a sentence written in french is not readily apparent to someone who does not read the language, the NMEA-0183 sentence has structure and meaning if you understand the various words used.
The following link provides a synopsis of the NMEA-0183 sentence structure: http://www.windmill.co.uk/monitor52.html
jimh posted 03-13-2007 08:53 PM ET (US)
Yes, er, No. I meant NMEA-0183 sentences. But you still need to have some way to parse the data into a form which makes sense to human.
MTK posted 03-14-2007 10:01 AM ET (US)
Good news all!!
The hyperterminal test indicated that the GPS NMEA sentences were streaming out just fine.
Thanks for all your individual inputs about this matter...
MTK
jimh posted 03-14-2007 10:12 PM ET (US)
Give us a sample of the data stream you captured on your terminal program, please.
MTK posted 03-15-2007 12:32 PM ET (US)
Sample sentences are as follows,
$GPRMC,142354,A,2537.5568,N,0824.6341,W,0.0,33.0,140307,5.5,W,D*29
$GPGGA,142354,2537.5568,N,0824.6341,W,2,06,1.9,1.7,M,-26.4,,*70

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Author	Topic: NMEA sentences
MTK	posted 03-09-2007 11:02 AM ET (US) Does anyone know if GPS NMEA 0183 sentences can be viewed on a computer, without any special software?
MTK	posted 03-09-2007 12:03 PM ET (US) Maybe in DOS?
MTK	posted 03-09-2007 01:47 PM ET (US) I found the answer to my own question @ http://www.maptech.com/support/forums/messages.cfm?threadid=145&threaded=no&sortby=messagenum&startrow=1
where2	posted 03-10-2007 12:50 AM ET (US) The answer was YES, Use a terminal emulation software and look for an ascii stream coming in on a serial port at 4800bps, or 9600bps.
jimh	posted 03-13-2007 02:28 PM ET (US) Connecting the serial data output of a NMEA-2000 device to another serial data input is not particularly difficult to accomplish. It is fairly trivial. Once you have matched the serial data communication parameters, you will be able to see the serial data stream. However, that is just all you will see: a stream of seral data. You will not see "NMEA Sentences." If you wish to be able to read NMEA sentences you will have to have some sort of intelligent device which is able to receive the serial data stream and analyze it. The device will have to be able to decode the stream into datagrams, then parse the datagrams for their content, and finally convert the content into something understandable by a human. This is not a trivial task. You don't get to hook up to your serial port and see "Speed Over Ground is 4.6 knots."
where2	posted 03-13-2007 07:34 PM ET (US) With all due respect to the webmaster, the original question was NMEA-0183 sentences. NMEA-2000 is a completely different interface. No NMEA-0183 will not appear as "Speed over ground is 4.6kts", in your terminal emulation software but it should provide a readable sentence of data if you get your parameters set correctly. Typically, you will want to have a guide to help you parse out the sentence structure. Just as the meaning of a sentence written in french is not readily apparent to someone who does not read the language, the NMEA-0183 sentence has structure and meaning if you understand the various words used. The following link provides a synopsis of the NMEA-0183 sentence structure: http://www.windmill.co.uk/monitor52.html
jimh	posted 03-13-2007 08:53 PM ET (US) Yes, er, No. I meant NMEA-0183 sentences. But you still need to have some way to parse the data into a form which makes sense to human.
MTK	posted 03-14-2007 10:01 AM ET (US) Good news all!! The hyperterminal test indicated that the GPS NMEA sentences were streaming out just fine. Thanks for all your individual inputs about this matter... MTK
jimh	posted 03-14-2007 10:12 PM ET (US) Give us a sample of the data stream you captured on your terminal program, please.
MTK	posted 03-15-2007 12:32 PM ET (US) Sample sentences are as follows, $GPRMC,142354,A,2537.5568,N,0824.6341,W,0.0,33.0,140307,5.5,W,D29 $GPGGA,142354,2537.5568,N,0824.6341,W,2,06,1.9,1.7,M,-26.4,,70