Trimble Outdoors AcutimeTM2000 Synchronization Kit 0x37 0x38, Last Position and Velocity Request

A Trimble Standard Interface Protocol

0x37

0x38

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.

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.

Acutime 2000 Synchronization Kit User Guide A-35