Dear All,


I need to read data from a John Deere GPS. The GPS doesn't use the
traditional RS-232 interface with NMEA protocol, but instead it uses a
CAN bus at 250kbps and sends GPS data in NMEA2000 format inside CAN packets=
..

The CAN BUS is populated by the GPS, a monitor and an auto-pilot.

I got Bosch's documentation on CAN BUS (free) and also ISO 11783
standards. Interestingly, Bosch published their invention for free, then
comes ISO, adopts it and starts selling the documentation :(

Somewhere in ISO 11783-* I found that the NMEA 2000 messages are
standardized as IEC 61162-3.

I bought standard IEC 61162-3 for US$177.00 in the hope that it would
detail the packets' structures and data types, but it revealed to be a
very general overview of the protocol and doesn't give any pointers to
which other documents detail each message.

I simply can't afford buying all the related standards to try to find
the one I need.

I sniffed the CAN bus with a Saleae's Logic and an Atmel ATSAM3X-EK, and
captured a lot of traffic. Below are the CAN IDs of some of the packets:

83885952
218103594
419429139, 419430163
484910620
218034972, 218031644, 218032156, 351240220, 218103580, 419430172, 150994716
484900646, 486538790
419430354
485162790
217022492


Does someone know anything about NMEA 2000, and more specifically NMEA
2000 over CAN BUS?


Thanks,

Isaac

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