Appendix B: Binary Phase Output Format; Position Record - Garmin GPS 17HVS - Receiver Module Technical Specifications

APPENDIX B: BINARY PHASE OUTPUT FORMAT

Note: The following applies to all software versions of GPS 16LVS, GPS 16HVS, and GPS 17HVS.
Two records are transmitted once per second by the GPS 16/17 series products. One record contains primarily post-
process information, such as position and velocity information. The second record contains receiver measurement
information. The records are sent at a default baud rate of 9600 baud, 8 data bits, and no parity.
Records begin with a delimiter byte (10 hex). The second byte identifies the record type (33 hex for a position
record, 34 hex for a receiver measurement). The third byte indicates the size of the data. The fourth byte is the first
byte of data. The data is then followed by a checksum byte, a delimiter byte (10 hex), and an end-of-transmission
character (03 hex).
Note: If RTCM-104 differential data is sent to the GPS sensor, the board will reset the Phase Output Data baud rate
to the same baud rate used for RTCM-104 data. If the differential inputs are used on the GPS sensor, the RTCM-104
data must be sent to the GPS sensor at 9600 baud (preferred) or 4800 baud. RTCM-104 baud rates less than 4800
baud are not supported by the GPS sensors as it would limit bus bandwidth past the point where a once-per-second
phase output data rate could be maintained.

Position Record

- 0x10 (DLE is first byte)
- 0x33 (Position record identifier)
- 0x40 (Size of data)
- cpo_pvt_data (See description below)
- one-byte checksum (The addition of bytes between the delimiters should equal 0)
- 0x10 (DLE)
- 0x03 (ETX is last byte)
typedef struct
{
float alt;
float epe;
float eph;
float epv;
int fix;
double gps_tow;
double lat;
double lon;
float lon_vel;
float lat_vel;
float alt_vel;
float msl_hght;
int leap_sec;
long grmn_days;
} cpo_pvt_data;
190-00228-21 GPS 16/17 Technical Specifications
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