LS Industrial Systems XGB Series - XGT Server; TCP XGT Server

Chapter 6 Dedicated Service
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6.3 XGT Server
6.3.1 TCP XGT server
TCP XGT server operates as below [Fig.6-5] TCP XGT server operation flow.
Client
Time
①SYN
Time
②SYN ACK
③ACK
④PUSH ACK
PUSH ACK
⑥ACK
⑦FIN ACK
⑧ACK
⑨RST
Server
Transmission port : n >1024
Destination port : 2004
Connection
Disconnection
Connection
Disconnection
XGT dedicated
protocol
(Client)
XGT dedicated
protocol
(Server)
Transmission port : n >1024
Destination port : 2004
●
●
●
[Figure 6-5] TCP XGT server operation flow
(1) Connection
(a) Client does transmit ① SYN to serve. Server does ② SYN ACK.
(b) Connection port no. is XGT dedicated protocol port no. 2004.
(c) Client does connection check response ③ ACK.
(d) Finishing ~①③ makes client/server connection.
(2) TCP XGT server
(a) After connection, client does transmit PUSH ACK according to XGT dedicated protocol.④
(b) Server does transmit ⑤ PUSH ACK for PUSH ACK Frame.
(c) Client does transmit ⑥ACK.
(3) Disconnection
(a) Client does transmit ⑦ DISCONNECTION.
(b) Server does transmit ⑧ RST and disconnect.