Garmin GPS 17 Series Specyfikacja techniczna - Strona 34
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Each data member of the ephemeris data structure is indexed into the data array of the ephemeris packet and cast as
the appropriate data type. The indices are as follows (note that they correlate to the data members of the structure
respectively):
#define IDX_EPH_WN
#define IDX_EPH_TOC
#define IDX_EPH_TOE
#define IDX_EPH_AF0
#define IDX_EPH_AF1
#define IDX_EPH_AF2
#define IDX_EPH_URA
#define IDX_EPH_E
#define IDX_EPH_SQRTA
#define IDX_EPH_DN
#define IDX_EPH_M0
#define IDX_EPH_W
#define IDX_EPH_OMG0
#define IDX_EPH_I0
#define IDX_EPH_ODOT
#define IDX_EPH_IDOT
#define IDX_EPH_CUS
#define IDX_EPH_CUC
#define IDX_EPH_CIS
#define IDX_EPH_CIC
#define IDX_EPH_CRS
#define IDX_EPH_CRC
#define IDX_EPH_IOD
The last packet will be a "download complete" packet that will look like this:
TX Packet: Download Complete
Byte Description
Delimiter
Download Complete ID
Number of bytes in data
Ephemeris Download ID
Pad
Checksum calculation
Delimiter
End of packet
After properly acknowledging this packet (ACK the IOP_DL_CMPLT ID), the ephemeris download is complete.
190-00228-21
0
4
8
12
16
20
24
28
36
44
52
60
68
76
84
88
92
96
100
104
108
112
116
Name
DLE
IOP_DL_CMPLT
SIZE
IOP_DOWN_LOAD_EPH
DATA
CHKSUM
DLE
ETX
GPS 16/17 Technical Specifications
Page 30
HEX Value
0x10
0x0c
0x02
0x5D
0x00
----
0x10
0x03
Rev. A