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Trimble ThunderBolt E GPS Disciplined Clock User Guide 53
Trimble Standard Interface Protocol A
Report Packet 0x57: Information about Last Computed Fix
This packet provides information concerning the time and origin of the previous
position fix. The receiver sends this packet, among others, in response to packet 0x37.
The data format for this packet is shown below.
Report Packet 0x58: GPS System Data from the Receiver
This packet provides GPS data (almanac, ephemeris, etc.). The GPS receiver sends this
packet in response to packet 0x38. The data format is shown below. The table and
section numbers referred to in the "Meaning" column reference the Global Positioning
System Standard Positioning Service Signal Specification document.
Report Packet 0x58 Data Format
Note – If data is not available, byte 3 is set to 0 and no data is sent
Byte Item Type Value Meaning
0 Source of info UINT8 0
1
Old fix
New fix
1 Fix mode UINT8 0 No previous fix
1 Time only 1-SV
2 2D clock hold (not used)
32D
43D
5 Over-Determined Clock
6 DGPS reference (not used)
2-5 Time of last fix Single Seconds GPS time
6-7 Week of last fix UINT16 Weeks
Byte Item Type Value Meaning
0 operation UINT8 2 Data out
3 no data on SV
1 Type of data UINT8 2 Almanac
3 Health page, T_oa, WN_oa
4 Ionosphere
5UTC
6 Ephemeris
2 Sat PRN # UINT8 0 Data that is not satellite ID-specific
1 to 32 Satellite PRN number
3 Length (n) UINT8 Byte count
4 to n+3 Data