StarTech.com ICUSB2324852 interface cards/adapter

The ICUSB2324852 2 Port USB to RS232 RS422 RS485 Serial Adapter with COM Retention lets you connect every type of serial device to your USB-enabled computer, whether it be for RS232, RS422, or RS485 communication. The adapter features a 9-pin (DB9) male and a 5-pin terminal block serial connector as well as dip-switch controls for easy port configuration with minimal software requirements. The adapter also supports using 2 ports simultaneously, including with mixed protocols; for example RS-232 on port 1, and RS-485 on port 2, or a number of other combinations. For a convenient, and clean installation in office or industrial settings, the RS232/RS422/RS485 USB Adapter is wall-mountable and fully powered via the host USB connection, providing power to the attached serial device without requiring an external power adapter. Backed by a StarTech.com 2-year warranty and free lifetime technical support.
The StarTech.com Advantage - This single adapter is compatible with any serial device protocol (RS232, RS422, and RS485), and even allows mixing protocols for simultaneous communication over both ports - COM retention saves the assigned port settings for the device, so disconnecting/reconnecting is hassle-free - USB Powered - no power outlet required, and no cumbersome AC adapter to carry around