The FTDI Chip DB9-USB to UART converter module is used to upgrade an RS232 port to an active USB port without the need to redesign the PCB. The family consist of 6 modules, 2 of them operate at RS232 voltage levels while 4 of them operate at digital voltage level (a choice of 5V or 3.3V). Each of these is available to replace a male DB9. This active connector contains all the USB to UART (and vice versa) conversion electronics and is designed to fit directly into the same PCB footprint as a PC compatible UART DB9 connector.

Easy placement for an standard male RS232 DB9 footprint of a device
A selection of RS232, 3.3V or 5V UART signal levels
Works with USB 1.1 & 2.0 Host and Hub ports
Industry Standard FTDI chip set & device drivers for maximum compatibility
Microsoft Windows® WHQL-certified, Mac OS X, Linux and Windows CE device drivers
Installs as a standard Windows COM port
Has 128 byte transmit buffer and 256 byte receive buffer
Powered by USB port, no external power adapter required
Serial port speed up to 1Mbps
Operating temperature ranges between -40°C and 85°C

ANSI/ESD S20.20:2014
BS EN 61340-5-1:2007