Startechcom db9 to rj45 modular adapter ff convert your db9 male connector into an rj45 female connector 1x db9 female connector 1x rj45 female connector the gc98ff modular adapter features a db9 female connector and an rj45 female connector used for modular rs232 rs422 and rs485 connections the adapter converts your db9 male connection into an rj45 female connection the adapter allows for custom serial pin out configurations the db9frj45f adapter is backed by lifetime warranty gua