CPT7 and CPT7700 Installation and Operation User Manual v9
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Chapter 8 CAN Bus
The OEM7 receivers support the following CAN protocols:
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J1939 Transport and Extended Transport Protocol: used for corrections and NovAtel messages (both
transmitting and receiving)
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NMEA2000: used for standard as well as NovAtel-proprietary messages (transmitting only)
By default, CAN is disabled on OEM7 receivers. 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 CPT7 has internal CAN transceivers, however it still requires proper bus terminations.
Refer to
on page 170 for pin-out information.
OEM7 receivers support the following NMEA2000 Parameter Group Messages (PGN) over the CAN bus:
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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
The following commands and logs are used for CAN configuration:
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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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CCOMCONFIG
command: configures the parameters used by the NovAtel command interface to interact
with the CAN Bus.
CCOM ports with a lower port number have a higher transmission priority.
For information about these commands, see the
OEM7 Commands and Logs Reference Manual
Details for the PGN messages can be found in the NMEA2000 specification which can be purchased
directly from the National Marine Electronics Association (
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