Hi Richard! I really don't know if the data is NMEA. Indeed I'm suspecting that the data may be in a proprietary binary format. The receiver is John Deere StarFire 3000. I suppose that John Deere doesn't make GPS, so the manufacturer may be any. I captured lots of CAN packets and already deciphered some of them, but there are five or six proprietary PGNs. At least three of them may carry high-precision GPS information. I would appreciate any info that helps me to decipher the data. Best regards, Isaac Em 06/03/2013 17:38, Richard Prosser escreveu: > Hi Isac, > > Are you sure that the format is Nemea? Many manufacturers put out Nemea = as > an option but have an in-house binary format for their specialist > application. I work for Trimble and we have TSIP for binary, high > precision output and Nemea is available (sometimes as an addional purchas= e) > for external use. The TSIP output is required for cm accuracy. There is > information available on some of the binary formats used - others are mor= e > restricted. Who is the manufacturer of the GPS gear? > > Richard > > > > On 4 March 2013 08:58, Nily wrote: > >> or this one: >> http://www.can-cia.org/index.php?id=3D496 >> >> ----- Original Message ----- >> From: "Isaac Marino Bavaresco" >> To: "Microcontroller discussion list - Public." >> Sent: Sunday, March 03, 2013 9:34 AM >> Subject: RE: [EE] GPS, CAN & NMEA2000 >> >> >>> Em 3/3/2013 13:59, alan.b.pearce@stfc.ac.uk escreveu: >>>>> Maybe this will help you >>>>> http://www.adfweb.com/home/products/CAN_BUS_analyzers.asp >>>>> >>>>>> Does someone know anything about NMEA 2000, and more specifically >>>>>> NMEA 2000 over CAN BUS? >>>> Although that analyser talks about NMEA2000, it isn't clear to me that >> it >>>> actually decodes the messages into human readable format, it may only >>>> handle the burst mode decode noted in the Wikipedia article I posted. >>> I have already logged a lot of data from the bus with my Saleae Logic a= nd >>> an ATSAM3X-EK. I can see patterns in the data and probably may even >>> understand it with time, but I need something more trustable and fast. >>> >>> >>>> It strikes me that Isaac will have to buy the NMEA standard, and I wou= ld >>>> have thought the cost of such standards would be billable against the >>>> customer anyway. >>> >>> Yes, I already bought one of the documents from the standard, but it >>> doesn't help and not even gives a hint where to find the important >>> parts. Buying the entire set of documents is out of question, it would >>> cost several thousand dollars and would include too much information I >>> don't need. >>> >>> My client probably will desist of the project if he must buy the entire >>> set of documents. >>> >>> I would be glad to buy one or two more documents of the standard, only = I >>> would like to know what parts document the structure of the packets, >>> data types and what packets represent what information. >>> >>> >>> Best regards, >>> >>> Isaac >>> >>> -- >>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >>> View/change your membership options at >>> http://mailman.mit.edu/mailman/listinfo/piclist >>> >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .