Wired Network > Switches > Accessories: TrendNET USB to Serial Converter (TU-S9 (V3.0R)) USB 1.1, USB 2.0, 3.0 compatible, RS-232, DB-9, Serial cable
Connect a RS-232 serial device such as a modem to a USB port on your computer Easy installation Supports USB 1.1 and compatible with USB 2.0 and USB 3.0 ports Supports Windows® and Mac® operating systems