USB to RS422/485 Detachable Plug ConverterThe days of on board communication ports other than USB are virtually just a memory now, but they're still very common. RS 485 422 is commonly found in thermal printers (eg, point of sale), modem communications, and more. This converter provides that connection from your modern USB port with great reliability. Features: For use with POS Systems, Modems, Computers Automatically Detects Serial Signal Rate No External Power Required Plug & Play Supports: