Trimble Outdoors SK8 - Manual (Page 96)

A-32 Lassen-SK8 Embedded GPS Module
Trimble Standard Interface Protocol
A.17.26 Report Packet 0x46
This packet provides information about the satellite tracking status and the operational
health of the Receiver. The receiver sends this packet after power-on or software-initiated
resets, in response to Packet
0x 26 and, during an update cycle. Packet 0x 4B is always sent
with this packet.
The error codes in Byte 1 of Packet 0x 46 are encoded into individual bits within the byte.
The bit positions and their meanings are shown below.
*
Note – After this status is detected, its bit remains set until the receiver is reset.
A.17.27 Report Packet 0x47
This packet provides received signal levels for all satellites currently being tracked or on
which tracking is being attempted (i.e., above the elevation mask and healthy according to
Table A-30. Report Packet 0x46 Data Formats
Byte Item Type Value Meaning
0 Status Code BYTE 0 h Doing position fixes
01 h Don't have GPS time yet
02 h need initialization
03 h PDOP is too high
08 h No usable satellites
09 h Only 1 usable satellite
0A h Only 2 usable satellites
0B h Only 3 usable satellites
0C h The chosen satellite is unusable
1 Status codes BYTE 0-7 b See Table A-31
Table A-31. Report Packet 0x46 Bit Positions and Descriptions
Status Code Bit
Position
Meaning if bit value = 1
0 (LSB)
1
2
3
4
5
6
7 (MSB) No battery back-up at start-up (note 1)
not used
not used
not used
Antenna feed line fault (open or short)
not used
not used
not used