How to use this shield (instructions from wiznet)
Software You need to change the existing W5100 files to W5200 library files (download the W5200 library files from https://github.com/Wiznet/W5200-Ethernet-Shield)
1. Install W5200 library Overwrite w5100.cpp, w5100.h to the "/libraries/Ethernet/utility" folder in your Arduino IDE.
2. Using the W5200 library and evaluate existing Ethernet example. In the Arduino IDE, go to Files->Examples->Ethernet and open any example, compile and upload the file to Arduino board.
3. Note: libraries/Ethernet/Ethernet.h needs the following at line 10 instead of #define MAX_SOCK_NUM 4, since it doesn't #include "w5100.h" anymore: #ifdef W5200 #define MAX_SOCK_NUM 8 #else #define MAX_SOCK_NUM 4 #endif