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Author Topic:   NMEA sentences
MTK posted 03-09-2007 11:02 AM ET (US)   Profile for MTK   Send Email to MTK  
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)     Profile for MTK  Send Email to MTK     
Maybe in DOS?
MTK posted 03-09-2007 01:47 PM ET (US)     Profile for MTK  Send Email to MTK     
I found the answer to my own question @
where2 posted 03-10-2007 12:50 AM ET (US)     Profile for where2  Send Email to where2     
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)     Profile for jimh  Send Email to jimh     
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)     Profile for where2  Send Email to where2     
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:

jimh posted 03-13-2007 08:53 PM ET (US)     Profile for jimh  Send Email to jimh     
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)     Profile for MTK  Send Email to MTK     
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...


jimh posted 03-14-2007 10:12 PM ET (US)     Profile for jimh  Send Email to jimh     
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)     Profile for MTK  Send Email to MTK     
Sample sentences are as follows,



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