Data Sheet

iEthernet

W5200

5.2 Data Communications

After the initialization process, W5200 can transmit and receive the data with others

by ‘open’ the SOCKET of TCP, UDP, IPRAW, and MACRAW mode. The W5200 supports the

independently and simultaneously usable 8 SOCKETS. In this section, the

communication method for each mode will be introduced.

5.2.1 TCP

The TCP is a connection-oriented protocol. The TCP make the connection SOCKET by

using its own IP address, port number and destination IP address, port number. Then

transmits and receives the data by using this SOCKET.

Methods of making the connection to SOCKET are “TCP SERVER” and “TCP CLIENT”. It

is divided by transmitting the connect-request (SYN packet).

The “TCP SERVER” listens to the connect-request from the “TCP CLIENT”, and makes

connection SOCKET by accepting the transmitted connect-request (Passive-open).

The “TCP CLIENT” transmits the connect-request first to “TCP SERVER” to make the

connection (Active-open).

Figure 9 TCP SERVER and TCP CLIENT