SSC300 User’s Manual
Page B2
Appendix B
– NMEA 2000
®
Interfacing
Revision 1.0
2: Yaw
– This field always contains a value of 0x7FFF (data not available).
3: Pitch
– This field is used to report the vessel’s pitch.
4: Roll
– This field is used to report the vessel’s roll.
5: Reserved
– This field is reserved by NMEA; therefore, the SSC300 sets all bits to a
logic 1.
PGN 127258
– Magnetic Variation
The SSC300 may or may not periodically transmit this PGN depending on whether or not it has
been programmed with the local magnetic variation. Programming the magnetic variation
(through a Maretron display product like the DSM150, DSM250, or N2KAnalyzer software) will
cause the SSC300 to transmit this PGN once per second. If the local magnetic variation is not
known, then the variation can be disabled (again, through a display product like the DSM150,
DSM250, or N2KAnalyzer software) at which time the SSC300 will cease to transmit this PGN.
Field 1: SID
– The sequence identifier field is used to tie related PGNs together. For example,
the SSC300 will transmit identical SIDs for Vessel Heading (PGN 127250), Attitude
(127257), and Rate of Turn (127251) to indicate that the readings are linked together
(i.e., the data from each PGN was taken at the same time although they are reported
at slightly different times).
2: Variation Source
– This field always contains a value of 0x00 (manual entry).
3: Reserved
– This field is reserved by NMEA; therefore, the SSC300 sets all bits to a
logic 1.
4: Age of Service
– This field always contains a value of 0x7FFF (data not available).
5: Variation
– This field is used to report the local magnetic variation as entered by the
user. Positive values are Easterly and negative values are Westerly.
WARNING: Magnetic variation changes as your location on the earth changes and it
should be adjusted with these changes. Neither the DSM150, DSM250, or N2KAnalyzer
software nor the SSC300 will make these changes automatically; they are the
responsibility of the user.
SSC300 NMEA 2000
®
Non-Periodic Data Transmitted PGNs
PGN 126270
– Maretron Proprietary Slave Response – Deviation Calibration Status
This indicates the status of the deviation calibration process.
Field 1: Maretron Vendor ID and Industry Code (16 bits)
– this field’s value will be 0x9889
2: Product Code (16 bits)
– this field’s value will be 0x1B2, which is the NMEA 2000
®
product code for the SSC300.
3: Software Code (16 bits)
– this field’s value will be 0x0001, which is the identifier for this
version of the Maretron proprietary protocol
4: Command (8 bits)
– this field’s value will be 0x50, which indicates that this response
contains status for deviation calibration
5: Status Code (8 bits)
– this field will indicate the status of the calibration process with
one of the values from the following table (see following table).
