The FTDI USB-RS422 serial UART converter cable incorporates FTDI's FT232RQ USB to serial UART
interface IC, which handles all the USB signaling and protocols.
This FTDI converter cable provides a fast, simple way to connect
devices with an RS422 interface to USB. Each FTDI
USB-RS422 cable contains a small internal electronic circuit board
utilizing the FT232R that is encapsulated into the USB connector end of
the cable. The integrated electronics also include the RS422
transceiver plus Tx and Rx LEDs that give a visual indication of traffic
on the cable. The USB side of the cable is USB powered and USB 2.0 full speed compatible.