Trimble Outdoors SK8 - Manual (Page 103)

Lassen-SK8 Embedded GPS Module A-39
Trimble Standard Interface Protocol
A.17.36 Report Packet 0x56
If East-North-Up (ENU) coordinates have been selected for the I/O “velocity” option, the
receiver sends this packet under the following conditions:
• Each time that a fix is computed
• In response to Packet 0x 37 (last known fix)
The data format is shown below.
The time-of-fix is in GPS or UTC time as selected by the I/O “timing” option.
A.17.37 Report Packet 0x57
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
0x 37. The data
format is shown below.
Table A-39. Report Packet 0x56 Data Formats
Byte Item Type Units
0-3 East Velocity SINGLE m/s; + for east, - for west
4-7 North Velocity SINGLE m/s; + for north, - for south
8-11 Up Velocity SINGLE m/s; + for up, - for down
12-15 Clock Bias Rate SINGLE m/s
16-19 Time-of-Fix SINGLE seconds (GPS or UTC)
Table A-40. Report Packet 0x57 Data Formats
Byte Item Type/Units Byte 0 Value/Velocity
0 Source of
information BYTE/ - - - 00/none
01/regular fix
1 Mfg. diagnostic BYTE/ - - -
2-5 Time of last fix SINGLE/seconds, GPS time
6-7 Week of last fix INTEGER/weeks, GPS time