Figure 5. Tcp Client Mode - Wiznet WIZ1000-EU User Manual

TCP Server mode can be useful when the monitoring center tries to connect to the device
(where WIZ1000 is installed) in order to check the status or provide the commands. In normal
time WIZ1000 is on the waiting status, and if there is any connection request (SYN) from the
monitoring center, the connection is established (ESTABLISH), and data communication is
processed (Data Transaction). Finally connection is closed (FIN).
In order to operate this mode, Local IP, Subnet, Gateway Address and Local Port Number
should be configured first.
As illustrated in the above figure, data transmission proceeds as follows,
1. The host connects to the WIZ1000 which is configured as TCP Server mode.
2. As the connection is established, data can be transmitted in both directions – from the host
to the WIZ1000, and from the WIZ1000 to the host
<TCP client mode>

Figure 5. TCP Client mode

If WIZ1000 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, WIZ1000 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, WIZ1000 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 WIZ1000 and from WIZ1000 to the host.
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