StarTech 3 ft DB9 to 3.5 mm Serial Cable

Maintain precise serial control where signal integrity matters. This 3 ft DB9 to 3.5 mm serial cable connects computers with a DB9 9-pin serial port to devices that require 3-conductor RS-232 remote control through a 3.5 mm audio jack. It is designed for configuration and calibration workflows where a stable, short-run connection is preferred over improvised adapters. The cable uses 28 AWG copper wires and Al-Mylar shielding to help reduce electromagnetic interference in electrically noisy environments. Shielded metal shell connectors add another layer of protection at the termination points, supporting more consistent communication during setup and maintenance tasks. The black PVC jacket keeps the assembly practical for equipment rooms, test benches, and AV racks. For teams that still depend on serial control for legacy infrastructure, this cable provides a purpose-built path between modern and older control interfaces. The 3 ft length helps keep cable runs tidy and reduces slack behind consoles, controllers, and embedded devices. When the job calls for a direct RS-232 connection with fewer variables, this cable delivers the right physical interface without overcomplicating the install.