DB9 male to DB25 male serial adapter converts DB9 female port to a DB25 male port or a DB25 female port to a DB9 male port. It is an inexpensive alternative to buying a new cable. Use this adapter when you need to convert a DB9 port to DB25 or vice versa. The molded design provides a solid connection, and each adapter is fully shielded against outside EMI/RFI interference. With its straight-through design, this adapter is 100% compatible with all serial devices.