APPX
Appendix 5 TCP/IP Communications, UDP/IP Communications
379
A
Communication flow
This section describes the flow from the establishment of connection to end of communication.
Wait at least 500ms or more before executing the open processing again after the close request is sent from
the external device to the Ethernet-equipped module.
External device
Ethernet-equipped module
Server
Client
Passive open
Active open
Connection established
Connection established
After performing
Passive open, the server
will wait for an open request
from the client.
When the client sends
an Active open request
and the server accepts it,
a connection is established
between the client and the
server.
Receive processing
Receive processing
Open request
Response
Data sending
Data sending
Response
The client requests data
sending and sends data.
The client receives the response
to the data.
The client receives data and sends
back the response to the data.
Data sending
Data sending
Response
Close processing
Close request
Response
Close request
Close request
Response
ClosedClosed
The packet to stop communications is
exchanged then the connection is
disconnected.
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