Trimble Outdoors SK8 - Manual (Page 99)

Lassen-SK8 Embedded GPS Module A-35
Trimble Standard Interface Protocol
Altitude Flag
A flag that determines whether or not the Reference Altitude will be used. If set, it will be
used. If cleared, altitude hold (last 3-D altitude) will be used. The data format is shown in
the following table.
A.17.32 Report Packet 0x4B
The receiver transmits this packet in response to packets 0x 25 and 0x 26 and following a
change in state. In conjunction with Packet 0x 46, “health of receiver,” this packet
identifies the receiver and may present status messages. The machine ID can be used by
equipment communicating with the receiver to determine the type of receiver to which the
equipment is connected. Then the interpretation and use of packets can be adjusted
accordingly.
The status codes are encoded into individual bits within the bytes. The bit positions and
their meanings are shown in Table A-36.
Table A-34. Reference Altitude
Byte Item Type Units
0-3 Reference Altitude SINGLE Meters
4-7 Reserved SINGLE
8 Altitude flag BYTE
Table A-35. Report Packet 0x4B Data Formats
Byte Item Type/Value Status/Meaning
0 Machine ID BYTE 6-channel receiver
1 Status 1 BYTE see Table A-36
2 Status 2 BYTE Bit 0 = Super packets supported
Table A-36. Report Packet 0x4B Bit Positions and Descriptions
Status 1 Bit
Position
Meaning if bit value = 1
0 (LSB) not used
1 not used
2 not used
3 The almanac stored in the receiver, is not complete and
current
4-7 not used