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