Hi Francis,
Tyros5 ONLY supports the Yamaha USB-to-wifi adapter "UD-WL01" that is normally included.
By using this adapter, you can connect Tyros5 to your Router over your local wifi home network, OR you can make a DIRECT wifi connection to your Computer. In the FIRST case Tyros5 has to be in "Infrastructure Mode", in the SECOND case the "Access Point Mode" is used".
BUT you can only use these wifi connections to send Expansion Contents from Expansion Manager (YEM) on your Computer to the Tyros5 OR make a MIDI-over-wifi connection, for example to connect an iPad to the Tyros5.
There is NO way to connect the Tyros5 directly to the INTERNET. Also, NO USB-to-Ethernet adapters are supported by the Tyros5, to my knowledge.
Best regards,
Chris