TRENDnet TU-S9 USB to Serial Converter, RS-232 Adapter

Preserve access to serial equipment without changing the hardware that still does the job. The TRENDnet TU-S9 USB to Serial Converter bridges a USB port on a desktop or laptop to an RS-232 serial device, making it practical to keep modems and other legacy peripherals in service. For IT teams, this kind of adapter solves a real compatibility problem. Many environments still depend on serial-connected equipment for configuration, diagnostics, or specialized workflows. Rather than retiring stable devices early, this converter provides a direct path to modern host systems through USB, helping reduce disruption and extend the useful life of existing assets. The value is in continuity. You keep the device, preserve the workflow, and avoid unnecessary replacement costs. In support desks, field kits, and administrative workstations, a compact USB-to-serial bridge can be the difference between immediate access and a stalled maintenance task. The TU-S9 is built for that role: simple, direct, and focused on keeping RS-232 connectivity available where it still matters.