INST.No.INE-863B KR2S
【
Communication Interface
】
Instruction Manual
-8-
4-2-1
Establishment of TCP connection
When the high order communications between a PC (the side which requires data: Client) and this unit
(the side of which data is required: Server) is performed, it starts from establishing a TCP connection
according to the following procedures first.
1.
The PC transmits the TCP packet with the SYN flag set to this unit.
2.
When this unit receives the SYN packet, it transmits the TCP packet the SYN+ACK flags set to
the PC.
3.
When the PC receives the SYN+ACK packet, it transmits the TCP packet with the ACK flag set
to this unit.
U
R
G
0
A
C
K
P
S
H
R
S
T
S
Y
N
F
I
N
0
0
0
1
0
PC
(Client)
This unit
(Server)
1.
SYN
2.
SYN+ACK
3.
ACK
U
R
G
0
A
C
K
P
S
H
R
S
T
S
Y
N
F
I
N
1
0
0
1
0
U
R
G
0
A
C
K
P
S
H
R
S
T
S
Y
N
F
I
N
1
0
0
0
0
Summary of Contents for KR2S
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