User's Manual

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3.2.2 UDP Data
Table 3.6 GPS Data Packet – UDP Data
GPS UDP data: 512 bytes
GPS time data 18 bytes Header 2 bytes 0xFFEE, 0xFF first
Date
6 bytes
Year, month, and day (2 bytes each, lower byte first) in ASCII
Time 6 bytes Second, minute, and hour (2 bytes each, lower byte first) in ASCII
μs Time 4 bytes In units of μs (lower byte first)
GPRMC data 77 bytes ASCII code, valid till 2 bytes after ‘*’
reserved 411 bytes 411 bytes of 0xDF
validity of location 1 byte ASCII code, obtained from $GPRMC
A (hex = 41) for Valid Position, V (hex = 56) for Invalid Position, and NUL (hex = 0) for GPS being unlocked
flag of PPS lock 1 byte 1 – locked 0 – unlocked
reserved 4 bytes -
Example of UDP Data Analysis in GPS Data Packets
Figure 3.4 GPS Data Packet – UDP Data (Example)