Lassen SQ, Reference Manual

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Lassen SQ GPS Receiver 8 5
Trimble Standard Interface Protocol (TSIP) A
A.15.2
Command Packet 0x1F - Request Software Versions
This packet requests information about the version of software
running in the Navigation and Signal Processors. This packet contains
no data. The GPS receiver returns Packet
0x
45.
A.15.3
Command Packet 0x21 - Request Current Time
This packet requests current GPS time. This packet contains no data.
The GPS receiver returns Packet
0x
41.
A.15.4
Command Packet 0x23 - Initial Position
(XYZ Cartesian ECEF)
This packet provides the GPS receiver with an approximate initial
position in XYZ coordinates. This packet is useful if the user has
moved more than about 1,000 miles since the previous fix. (Note that
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 data format is shown below.
Note – To initialize using the Latitude-Longitude-Altitude
representation, use Command Packet
0x 2B.
Table A.12 Command Packet 0x23 Data Format
Byte Item Type Units
0-3 X Single Meters
4-7 Y Single Meters
8-11 Z Single Meters