I’m having the WIZ107SR-RS232 here, but I would like to use it as TTL instead of the RS-232.
Referring to the schematic wiz107sr_rev1_4.pdf for WIZ107SR, is the following step correct to make it as TTL version:
remove the R21, R22, R23, R24
remove the U2
add the R38, R39, R40, R41