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Lassen-SK8 Embedded GPS Module A-65
Trimble Standard Interface Protocol
*
Note – Auto-report requires that superpacket output is enabled. Refer to Command
Packet 35.
A.18.4 Command Packet 0x8E-26
The 0x8E-26 command is issued with no data to cause the current settings to be saved to
non-volatile memory. See A.3 for information on saving the settings to non-volatile
memory. The 0x8F-26 report is generated after the values have been saved.
A.18.5 Report Packet 0x8F-15 - Current Datum Values (not supported with
Firmware 7.52)
This packet contains 43 data bytes with the values for the datum currently in use and is
sent in response to Packet 0x8E-15. (However, version 7.52 firmware will only support
WGS-84 datum.) If a built in datum is being used both the datum index and the 5 double
precision values for that index will be returned. If the receiver is operating on a custom
user entered datum the datum index will be set to -1 and the 5 values will be displayed.
These 5 values describe an ellipsoid to convert ECEF XYZ coordinate system into LLA.
*
Note – A complete list of datums is provided at the end of this appendix. Eccentricity
Squared is related to flattening by the following equation:
e
2
=2ρ-ρ
2
Table A-77. Command Packet 0x8E-26 Definitions
Byte # Item Type Value Meaning
0 Subcode BYTE 0x26 Save Settings
Table A-78. Report Packet 0x8F-15 Field Descriptions for Converting
Ellipsoid ECFF XYZ to Coordinate System LLA
Byte Type Value
0 BYTE Id for this sub-packet (always 0x15)
1-2 INTEGER Datum Index (-1 for custom)
3-10 DOUBLE DX
11-18 DOUBLE DY
19-26 DOUBLE DZ
27-34 DOUBLE A-axis
35-42 DOUBLE Eccentricity Squared