9−pin D−sub to 3.5mm Adapter Cable Kramers C−A35M/D9F is an adapter cable for converting RS−232 on a 3.5mm stereo plug (M) to a 9−pin D (F) connector. Quality Construction Data cable with a molded 3.5mm stereo plug at one end and a 9−pin D−sub female at the other. Length Available in a 1.8m (6ft) length.