1. Run the S300 Power Reset and note the IP address of S300 at the top (refer to picture below)

Please check the Pinpad number indicated on pinpad hardware and guide yourself to SHARED # tab accordingly.

Change the IP ADDRESS on SHARED # setting according to ip address noted on step 1.
3. Don't forget to click on "SAVE" and "RESTART PROGRAM" on top right corner after you made change.