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A-26 Acutime 2000 Synchronization Kit User Guide
Trimble Standard Interface Protocol
A
0x2B Command Packet 2B
Initial Position (Latitude, Longitude, Altitude)
Command
This packet provides the GPS receiver with an approximate initial
position in latitude and longitude coordinates (WGS-84). This packet
is useful if the user has moved more than about 1,000 miles since the
previous fix.
!
Note – The GPS receiver can initialize itself without any data from the
user; this packet merely reduces the time required for initialization.
This packet is ignored if the receiver is already calculating positions.
The cold-start default LLA position is 0, 0, 0.
The data format is shown below.
The GPS receiver returns packet 4C.
0x2D Command Packet 2D
Oscillator Offset Request
This packet requests the calculated offset of the GPS receiver master
oscillator. This packet contains no data. The GPS receiver returns
packet 4D hex. This packet is used mainly for service.
Table A-20 Command Packet 2B
Byte Item Type Units
0-3 Latitude Single radians, north
4-7 Longitude Single radians, east
8-11 Altitude Single meters