3.5. HOW TO CONFIGURE CAN OUTPUT
In a similar way, up to three streams can be con
fi
gured to output the proprietary J1939
messages. Supported intervals are again 50ms, 100ms, 200ms, 500ms or 1s.
Figure 3-23:
J1939 PGN con
fi
guration
3.5.1 Supported
NMEA2000
and
J1939
CAN
messages
Septentrio receivers which support the CAN bus interface are able to output the NMEA2000
messages listed below:
PGN
Description
Max. update rate
PGN129029
NMEA2000 GNSS Position
1Hz
PGN129028
NMEA2000 Altitude Delta, High Precision
Rapid Update
20Hz
PGN129027
NMEA2000 Position Delta High Precision
Rapid Update
20Hz
PGN127250
NMEA2000 Vessel Heading
20Hz
PGN129539
NMEA2000 GNSS DOPs
1Hz
PGN129025
NMEA2000 GNSS Position Rapid Update
20Hz
PGN126992
NMEA2000 System Time
1Hz
PGN129026
NMEA2000 COG and SOG Rapid Update
20Hz
Detailed descriptions of the PGN messages are found in the NMEA2000 speci
fi
cation which
can be purchased directly from the National Marine Electronics Association.
Messages PGN129028 and PGN129027 are special messages which depend on PGN129029.
These messages contain delta values which can be used to calculate the current position
(latitude, longitude, altitude) and time by comparing them to PGN129029.
Since the
maximum allowed update rate of PGN129028 and PGN129027 is much higher than that of
PGN129029, this allows the user to obtain the positioning information at a higher update
rate as compared to what would be possible using just PGN129029. Messages PGN129028
and PGN129027 can be related to the corresponding PGN129029 message by comparing the
Sequence ID
’
s (SID
’
s). An example of how to calculate the current Altitude (using PGN129028
and PGN129029) and Position (using PGN129027 and PGN129029 is shown in Figure 3-24.
32
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Страница 14: ...2 3 ASTERX U3 DESIGN Figure 2 4 Mounting brackets fitted to the AsteRx U3 14 ...
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