Filter
Top Products
Lassen-SK8 Embedded GPS Module A-27
Trimble Standard Interface Protocol
A.17.19 Command Packet 0x38
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 unit via a data logger or computer and then using that data
to initialize a second GPS receiver unit). The GPS receiver returns Packet 0x58. (Note that
the GPS receiver can initialize itself without any data from the user; it merely requires
more time.)
To request data without loading data, use only bytes 0 through 2; to load data, use all
bytes. Before loading data, observe the caution notice below. The data formats are located
in Report Packet 0 x 5B.
I
Caution – Proper structure of satellite data is critical to SVeeSix 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.
*
Note – Ephemeris can not be loaded into the receiver in Version 7.52.
Table A-22. Command Packet 0x38 Data Formats
Byte Item Type Value Meaning
0 Operation Byte 1
2
Request data from SVeeSix;
Load data into SVeeSix
1 Type of
data
Byte 1
2
3
4
5
6
not used
Almanac
Health page, T_oa, WN_oa
Ionosphere
UTC
Ephemeris; request only
2 Sat PRN# Byte 0
1 - 32
data that is not satellite - ID
specific
satellite PRN number
3 length (n) Byte number of bytes of data to be
loaded
4 to n+3 data n Bytes