101501-565 Rev C Page 14 of 58
5.0 ETHERNET COMMANDS
5.1 TCP/IP FORMAT
Each Ethernet command will consist of a TCP/IP header followed by the required
data bytes. Figure 27 summarizes the TCP/IP header configuration. Please note
that this functionality is provided by the software implementation of the Open
Systems Interconnection (OSI) TCP/IP protocol stack, specifically the upper 4
layers.
Byte
0 Protocol
Version
Header
Length
Type Of
Service
Total Length
4 Packet ID
Flags Fragmentation Offset
8 Time To Live
Protocol Header checksum
12 Source Address
16 Destination Address
20 Source Port
Destination Port
24 Sequence Number
28 Acknowledgement Number
32 Data
Offset
Reserved Code Bits
Window
36 Checksum
Urgent Pointer
40 Data Byte 1
Data Byte 2 Data Byte 3 Data Byte N
Figure 24: Network TCP/IP datagram header
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