Celestron 18775 USB To RS-232 Converter Cable TRENDnet USB to RS-232 Converter Cable - TRENDnet 2 Year Warranty Standards: USB 1.1 Interface: 1x USB Type A 1x RS-232 (9-pin) male Cable length: 60cm (24 in.) Data Rate: Up to 6 Mbps Supported OS: Windows 10, 8.1, 8, 7 Mac OS 10.11, 10.10, 10.9, 10.8, 10.7, 10.6