Communication Process - Mitsubishi Electric QJ71E71-100 User Manual

Q corresponding ethernet interface module
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7.2.2

Communication process

This section describes the process from establishing a connection to terminating communications.
After the server performs
Passive open, it will wait
for an open request from
the client.
After the connected device sends a close request to the E71, wait for 500ms or more before performing an open process
again.
Server
E71
Passive open
Open request
Response
Connection established
Data sending
Response
Receive process
Data sending
Data sending
Response
Close request
Response
Close request
Close request
Response
Closed
CHAPTER 7 COMMUNICATION PROCEDURE
Client
Connected device
When the client sends
an Active open request
and the server accepts it,
Active open
a connection is established
between the client and the
server.
Connection established
The client requests data
Data sending
sending and sends data.
The client receives the response
to the data.
The client receives data and sends
back the response to the data.
Receive process
Close process
The packet to stop communications is
exchanged then the connection is
disconnected.
Closed
7
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