Hi PaulRB,
Ok thanks. The thing on the left side is a drive for servo motors. This drive has a Lan interface. I would like to create a Wlan module that I dont have to connect the PC over Lan with the drive. Therfore I would connect the Wlan module to the Lan interface of the drive. The qestion is what kind of items that I have to use to create this Wlan module. Is the idea more clear`? 
It is a replacement of the lan connection to the PC with a handmade Wlan adapter which will be pluged in to the drive over the lan interface.
regards
Richi