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A Trimble Standard Interface Protocol
46 Trimble ThunderBolt E GPS Disciplined Clock User Guide
• UTC (universal coordinated time)
Command Packet 0x37: Request Status and Values of Last Position
This packet requests information regarding the last position fix (normally used when
the GPS receiver is not automatically outputting fixes). The GPS receiver returns the
position/ velocity auto packets specified in the 0x35 message as well as message 0x57.
This packet contains no data.
Byte Data Type Bit Value Meaning Associated Packet
0Position00
1
ECEF off
ECEF on
0x42 or 0x83
10
1
LLA off
LLA on
0x4A or 0x84
20
1
HAE (datum)
MSL geoid
1
1
When using the MSL altitude output, the current datum must be set to WGS-84.
0x4A or 0x84
3 0 reserved
40
1
single-precision position
double-precision position
0x42/4A
0x83/84
5 0 Superpacket 0x8F-20 off
Superpacket 0x8F-20 on
0x8F-20
0x8F-20
5:7 0 reserved
1Velocity00
1
ECEF off
ECEF on
0x43
10
1
ENU off
ENU on
0x56
2:7 0 reserved
2Timing00
1
GPS time reference
UTC time reference
0x42, 0x43, 0x4A,
0x83, 0x84, 0x56
10
1
Compute fix ASAP
Compute fix on integer second
0x42, 0x43, 0x4A,
0x83, 0x84, 0x56
20
1
0x37Time of fix: when computed
0x37Time of fix: on request
0x37
30
1
Simultaneous meas. Status off
Simultaneous meas. Status on
40
1
Minimum projection off
Minimum projection on
5:7 0 reserved
3 Auxiliary 0 0
1
Raw measurement packet 5A off
Raw measurement packet 5A on
0x5A
10
1
Raw codephase measurements
Filtered codephase measurements
2:7 0 reserved