As SHN noted in their response to your earlier Topic on accessing the EZSrve link database while connected using EZSrve, that cannot be done. You do have full read/write access to the EZSrve link database when the SHN Utility is connected using a PLC.
You are correct in that the Controller device requires a link record pointing to the responder device and the responder device requires a link record containing the controller device address. Those two link records together are considered one link. What EZIOxx device are you trying to link to the EZSrve. Perhaps I can help you get that device linked using EZSrve function rather than SHN Utility function.