User's Manual

Ethernet Header: 42 bytes
Table 3.5 GPS Data Packet Ethernet Header Definition
Ethernet II MAC 12 bytes
2 bytes
20 bytes
4 bytes
4 bytes
Destination: Broadcast (0xFF: 0xFF: 0xFF: 0xFF: 0xFF: 0xFF), Source: (xx:xx:xx:xx:xx:xx)
0x08, 0x00
Version, Header Length, Differentiated Services, Field, Total Length, Identification, Flags, Fragment
Offset, Time to Live, Protocol, Header Checksum, Source IP Address, Destination IP Address
UDP source port (0x2710, represents10000), destination port (0x277E, represents 10110)
Length 2 bytes (0x208, represents 520 bytes), checksum 2 bytes (0x00, represents no check)
Ethernet Data Packet Type
Internet Protocol
UDP Port Number
UDP Length and Checksum
3.2.1 GPS Data Packet – Ethernet Header
Each GPS Data Packet has a 42 bytes ethernet header and 512 bytes UDP Data. All the multi-byte values are the unsigned type and in Little
Endian format. GPS UDP Data Packet will be triggered if there is GPS PPS signal, and the port is 10000.
3.2 GPS Data Packet Ethernet Header/UDP Data
IP Address
The destination IP address is 0xFF FF FF FF and in broadcast form.
The default source IP address is 192.168.1.201.
Taking“Internet Protocol (20 bytes)” as an example,
it is described as Figure 3.3:
Figure 3.3 GPS Data Ethernet Header Internet Protocol Illustration
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