Hi Chuguang,
it depends on what you mean by Ethernet Communication. If you mean UDP or TCP/IP (which both often work over Ethernet), you can use either Packet Input/Packet Output blocks if your data is structured as messages of fixed size, in binary or text format. Or you can use Stream Input/Stream Output blocks if your data is a stream of messages, typically ASCII text. For any of these blocks, please select the appropriate protocol driver using the Install New Board button.
You can also take a look at the sldrtex_packetio and sldrtex_streamio shipping ewxamples that can give you an idea of the correct implementation.
Good Luck, Jan
