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Chapter 4 SMART2 CAN Bus
The SMART2 supports the transmission of NMEA2000 messages over the CAN bus.
By default, CAN is disabled on the SMART2. Critical CAN configuration parameters such as Parameter Group
Numbers (PGNs), addresses and priorities are system-specific and must be explicitly configured.
The addresses and PGNs are typically allocated when the overall CAN bus topology is determined. A Node has
a unique CAN J1939 NAME and address.
The SMART2 has internal CAN transceivers, however they still require proper bus
terminations.
Refer to Table 19: SMART Antenna Interface Cable Connector Pin Out on page 73 for pin-out information.
The SMART2 supports the following NMEA2000 Parameter Group Messages (PGN) over the CAN bus:
PGN 126992 System Time
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PGN 129025 GNSS Position Rapid Update
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PGN 129026 COG & SOG Rapid Update
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PGN 129027 Position Delta High Precision Rapid Update
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PGN 129029 GNSS Position
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PGN 129551 GNSS Differential Signal
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The following commands and logs are used for CAN configuration:
CANCONFIG command: controls the CAN transceiver hardware and places the receiver on bus or off bus
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J1939CONFIG command: assigns the CAN J1939 NAME and address parameters to a Node
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J1939STATUS log: reports the status a Node on the J1939 CAN network, such as the claimed address
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LOG CCOMx PGNabcd: configures the NMEA2000 messages
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CCOM ports with a lower port number have a higher transmission priority.
For information about these commands, see the
Details for the PGN messages can be found in the NMEA2000 specification which can be purchased
directly from the National Marine Electronics Association (www.nmea.org/).
4.1 Default Configuration
After a FRESET, the receiver has the following CAN configuration:
The CAN physical port is disabled
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No J1939 addresses are claimed
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The CCOM1 port is configured for NMEA2000 messages only
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SMART2 Installation and Operation Manual v4
Agriculture Commands and Logs Reference
Manual.
36
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