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A-22 Lassen-SK8 Embedded GPS Module
Trimble Standard Interface Protocol
A.17.11 Command Packet 0x2A
*
Note – This packet sets or requests the altitude parameters used for the Manual 2-D
mode: Reference Altitude and Altitude Flag. Packet 0x4A (type 2) is returned.
Reference Altitude is the altitude used for manual 2-D positions if the altitude flag is set.
Altitude is in units of HAE WGS-84 or MSL depending on the selected I/O options for the
position. The Altitude Flag determines whether or not the Reference Altitude will be used.
If set, it will be used. If cleared, altitude hold (last 3-D altitude) is used.
*
Note – With no data bytes, this packet requests the current values of these altitude
parameters. In this case, the GPS receiver returns Packet 4A.
*
Note – Sets the Altitude Flag.
Table A-17. Packet 0x2A Set Altitude Only Description
Byte Item Type Meaning
0-3 Altitude SINGLE Reference altitude for 2-D
Table A-18. Reset Altitude Flag Description
Byte Item Type Value Meaning
0 Altitude Flag BYTE 0 x 00 Clear Altitude flag