The Keyspan USA19HS is a USB-A to serial (RS-232) adapter for Mac and PC computers. It is meant for connecting legacy serial/RS-232 devices with nine-pin DE-9 connectors to current computers having only USB ports.
Device communications at up to 230 Kbps
Mac OS 8.6 or greater
In the Box
Keyspan USA19HS USB-A to Serial (RS-232) Adapter (Mac/PC)