In the documentation of the user manual  page 4 under ordering information it is mentioned that there are 2 versions.
One is RS232 the other is TTL.
Yet the scematics  shows that SP3232EBEY is connected so does the TTL version exist?
On mouser we find only the RS232.
How can we order TTL version of the module WIZ107SR-TTL?
User’s manual  page 4 is just select pin for RS232 & TTL.
TTL version is the right picture.
It is need jumper cap.
refer to below URL.