Garmin GPS 15L Technical Specifications

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Garmin GPS 15L Technical Specifications Manual pdf 37 page image

190-00266-01 GPS 15H & 15L Technical Specifications Rev. DPage 33Each data member of the ephemeris data structure is indexed into the data array of the ephemeris packetand cast as the appropriate data type. The indices are as follows (note that they correlate to the datamembers of the structure respectively):#define IDX_EPH_WN 0#define IDX_EPH_TOC 4#define IDX_EPH_TOE 8#define IDX_EPH_AF0 12#define IDX_EPH_AF1 16#define IDX_EPH_AF2 20#define IDX_EPH_URA 24#define IDX_EPH_E 28#define IDX_EPH_SQRTA 36#define IDX_EPH_DN 44#define IDX_EPH_M0 52#define IDX_EPH_W 60#define IDX_EPH_OMG0 68#define IDX_EPH_I0 76#define IDX_EPH_ODOT 84#define IDX_EPH_IDOT 88#define IDX_EPH_CUS 92#define IDX_EPH_CUC 96#define IDX_EPH_CIS 100#define IDX_EPH_CIC 104#define IDX_EPH_CRS 108#define IDX_EPH_CRC 112#define IDX_EPH_IOD 116The last packet is a “download complete” packet that looks like this:TX Packet: Download CompleteByte Description Name HEX ValueDelimiter DLE 0x10Download Complete ID IOP_DL_CMPLT 0x0cNumber of bytes in data SIZE 0x02Ephemeris Download ID IOP_DOWN_LOAD_EPH 0x5DPad DATA 0x00Checksum calculation CHKSUM ----Delimiter DLE 0x10End of packet ETX 0x03After properly acknowledging this packet (ACK the IOP_DL_CMPLT ID), the ephemeris download iscomplete.

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