The Kramer C-D9M/D9F-15 control cables are for RS-232 applications to control devices within a professional AV system. Many Kramer products are RS-232 controllable and equipped with 9-pin D connector. This RS-232 cable helps to connect them safely to transmit the RS-232 serial commands to a touch-screen system, PC, or other serial controller equipped with 9-pin D connector.