Download Q Corresponding Ethernet Interface Module User`s Manual

CHAPTER 7 COMMUNICATION PROCEDURE
7.3
UDP/IP Communications
This section describes UDP/IP communications. In UDP/IP communications, the system does not establish a
connection and does not check whether each data has arrived at the destination normally, thereby reducing the load
on the line. However, UDP/IP communications do not guarantee data reliability as the TCP/IP communications do.
7.3.1
Communication process
Unlike TCP/IP communications, UDP/IP communications do not require connections to be established with connected
devices.
Server
Client
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E71
Connected device
Open
Open
Data sending
Data sending request
The client opens
the port.
The client specifies
the destination and
sends data to it.
7.3 UDP/IP Communications
7.3.1 Communication process
The server requests
Receive process (reading)
data reception and
reads the received data.
Data sending request
Data sending
Receive process (reading)
Close
Close
The client performs
the close process.
After the connected device sends a close request to the E71, wait for 500ms or more before performing an open process
again.
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