Figure 5. Udp Mode - Wiznet WIZ110SR User Manual

If WIZ110SR is set as TCP Client, it tries to establish connection to the server.
To operate this mode, Local IP, Subnet, Gateway Address, Server IP, and Server port number
should be set. If server IP had domain name, use DNS function.
In TCP Client mode, WIZ110SR can actively establish a TCP connection to a host computer
when power is supplied.
As illustrated in the above figure, data transmission proceeds as follows:
1. As power is supplied, WIZ110SR board operating as TCP client mode actively establishes a
connection to the server.
2. If the connection is complete, data can be transmitted in both directions – from the host
to the WIZ110SR and from WIZ110SR to the host
<Mixed mode>
In this mode, WIZ110SR normally operates as TCP Server and waits for the connection
request from the peer. However, if WIZ110SR receives data from the serial device before
connection is established, it changes to the client mode and sends the data to the server IP.
Therefore, at the mixed mode, the server mode is operated prior to the client mode.
As like TCP Server mode, the Mixed mode is useful for the case that the monitoring center
tries to connect to the serial device (in which WIZ110SR is used) to check device status. In
addition to this, if any emergency occurs in the serial device, the module will change to
Client mode to establish the connection to the server and deliver the emergency status of
the device
ⓚ Use UDP mode
At the UDP mode, the connection establishment is not defined. Just set the IP address and
port number of the peer and send the data.
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Figure 5. UDP mode

ASRB for SERIAL | 12 page