118158
‐
001
REV.
A
5
OF
20
1.
The
eSL
Digital
Interface
1.1.
Ethernet
The
eSL
supports
Ethernet
communications
only.
Each
Ethernet
command
will
consist
of
a
TCP/IP
header
followed
by
the
required
data
bytes.
Figure
below
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