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Acutime 2000 Synchronization Kit User Guide A-35
A Trimble Standard Interface Protocol
0x37 Command Packet 37
Last Position and Velocity Request
This packet requests information regarding the last position fix. The
GPS receiver returns packet 57 and the appropriate position packet 42
or 4A, or 83 or 84, and the appropriate velocity packet 43 or 56, based
on the I/O options in effect. In timing mode, the GPS receiver returns
packets 57 and 54.
0x38 Command Packet 38
Download and UpLoad Satellite System Data
This packet requests current satellite data (almanac, ephemeris, etc.)
or permits loading initialization data from an external source (for
example, by extracting initialization data from an operating GPS
receiver via a data logger or computer and then using that data to
initialize a second GPS receiver unit). The GPS receiver returns
packet 58.
!
Note – The GPS receiver can initialize itself without any data from the
user; it just requires more time.
To request data without loading data, use only bytes 0 through 2.
To load data, use all bytes.
"
Caution – Proper structure of satellite data is critical to receiver
operation. Requesting data is not hazardous; loading data improperly
is hazardous. Use this packet only with extreme caution. The data
should not be modified in any way. It should only be retrieved and
stored for later reload.