The USB-RS485-PCBA FTDI chip is a USB to RS485 converter.
It consists of a USB connector on a printed circuit board.
The board contains the FT232RQ FTDI chip and enables fast and easy connection to devices with a serial RS232 interface.
The printed circuit board handles the entire USB protocol.
The USB-RS485-PCBA includes the FT232RQ, which is programmed with a unique USB serial number.
This can be used to set up the transfer of password-protected files.