Maretron SSC200 - Manual (Page 36)

SSC200 User’s Manual
Page B4 Appendix B – NMEA 2000
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Interfacing Revision 1.8
12: Maretron Command – set this field’s value to 0xF0, which will initiate a reset and start
the calibration process.
PGN 126208 – NMEA Command Group Function – Maretron Proprietary Installation
Offset. This PGN performs the installation offset of the compass. It sets the roll and pitch
outputs to zero at the compass’ current orientation and sets the heading reading for the current
orientation to the value given by the PGN (see page B3 for complete description of PGN
126270).
Field 1: Complex Command Group Function Code (8 bits) – set this field’s value to 0x01,
which denotes a command PGN
2: Commanded PGN (24 bits) – set this field’s value to 126720 decimal (0x1EF00
hexadecimal), which denotes the Maretron proprietary PGN
3: Priority Setting (4 bits) – set this field’s value to 0x8, which indicates to leave priority
settings unchanged
4: Reserved (4 bits) – set this field’s value to 0xF, which is the value for a reserved field
of this size
5: Number of Pairs of Commanded Parameters to Follow (8 bits) – set this field’s value
to 0x4, indicating that four parameters will follow
6: Number of First Commanded Parameter (8 bits) – set this field’s value to 0x1
7: Maretron Vendor ID and Industry Code (16 bits) – set this field to 0x9889, which is a
combination of Maretron’s vendor ID and the marine industry code
8: Number of Second Commanded Parameter (8 bits) – set this field’s value to 0x02
9: Product Code (16 bits) – set this field’s value to 0x1B2, which is the NMEA 2000
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product code for the SSC200.
10: Number of Third Commanded Parameter (8 bits) – set this field’s value to 0x03
11: Software Code (16 bits) – set this field’s value to 0x0001, which is the identifier for
this version of the Maretron proprietary protocol
12: Maretron Command (8 bits) – set this field’s value to 0x24, which will cause
installation-offset calibration to be performed
13: Heading Value (16 bits) – set this field’s value to the current known heading in tenths
of degrees (a value between 0 and 3599). For example, 121.7° would be
programmed as 1217 decimal, or 0x4C1 hexadecimal.
PGN 126208 – NMEA Request Group Function – Transmission Periodic Rate
This PGN will enable or disable the periodic transmission of specific PGNs.
Field 1: Complex Command Group Function Code (8 bits) – set this field’s value to 0x00,
which denotes a request PGN
2: Requested PGN (24 bits) – set this field’s value to the corresponding PGN for which
you wish to change the periodic rate.
3: Transmission Interval (32 bits) – set this field’s value to 0x0 to disable the periodic
transmission of the PGN identified in field 2 above. Otherwise, program in the default
periodic rate to restore periodic transmission of the PGN identified in field 2 above.
The resolution of this field is 1 millisecond.
4: Transmission Interval Offset (16 bits) – set this field’s value to 0xFFFF; all other
values will cause the request to be rejected.
5: Number of Pairs of Commanded Parameters to Follow (8 bits) – set this field’s value
to 0x0.