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A-106 Acutime 2000 Synchronization Kit User Guide
Trimble Standard Interface Protocol
A
00x8F-20
Report Packet 8F-20
Last Fix with Extra Information (binary fixed point)
This packet provides information concerning the time and origin of
the previous position fix. This is the last-calculated fix; it could be
quite old. The receiver sends this packet in response to Packet 8E-20;
it also can replace automatic reporting of position and velocity
packets. Automatic output of 8F-20 must also be enabled by setting
bit 5 of byte 0 in command packet 0x35 and bit 0 of bytes 1-2 in
command packet 0x8E-A5.
The data format is shown in the table below.
Table A-87 Report Packet 8F-20
Byte # Item/Type Meaning
0 Subpacket ID / BYTE ID for this subpacket (always 0x20)
1 KeyByte/BYTE Reserved for Trimble DGPS postprocessing
2-3 east velocity /
INTEGER
units 0.005 m/s or 0.020 m/s (see Byte 24).
Overflow = 0 x 8000
4-5 north velocity /
INTEGER
units 0.005 m/s or 0.020 m/s (see Byte 24).
Overflow = 0 x 8000
6-7 up velocity /INTEGER units 0.005 m/s or 0.020 m/s (see Byte 24).
Overflow = 0 x 8000
8-11 Time of Week /
UNSIGNED LONG
GPS Time in milliseconds
12-15 Latitude / LONG
INTEGER
Latitude, units = 2
-31
semicircle, according to
current datum.
Range = -2
30
to 2
32
16-19 Longitude /
UNSIGNED LONG
Longitude east of meridian, units = 2
-31
semicircle, according to current datum.
Range = 0 to 2
32
20-23 Altitude / LONG
INTEGER
Altitude above ellipsoid, mm, according current
datum.
24 Velocity Scaling When bit 0 is set to 1, velocities in Bytes 2-7
have been scaled by 4.