Tripp Lite 2-Port USB to DB9 Serial FTDI Adapter Cable with COM Retention (M/M), 6 ft. (1.83 m)

The Tripp Lite U209-006-2 is a two port USB to DB9 serial adapter cable that bridges older RS 232 equipment with a modern computer that only offers a USB A connection. It converts one USB slot into two independent serial COM ports, making it simple to keep modems, point of sale terminals, label printers, industrial controllers, or other legacy devices in service.

A built in FTDI FT232RL chipset manages the protocol conversion, so the cable installs cleanly on Windows, macOS, and Linux systems. Each time you plug it in, the COM retention feature restores the original port numbers, preventing software from losing track of connected hardware after a reboot or desk move.

The cable supports data rates up to 225 Kbps, nearly twice what a traditional onboard serial port delivers. Engineers in the field, IT administrators in a server room, or hobbyists working on a home automation project will appreciate the extra headroom when large data bursts hit the line.

Power flows directly from the USB bus, so there is no external adapter to pack or misplace. A six foot length offers enough reach to connect gear on a bench or inside a rack while keeping the host computer in a comfortable position. Foil and braid shielding surrounds the conductors to help reduce electromagnetic and radio frequency interference, preserving signal integrity in offices, labs, or factory floors.

Highlights:

• Turns one USB A port into two DB9 RS 232 serial ports
• Handles data transfer up to 225 Kbps
• Draws power from the host computer, no external supply needed
• Six foot cable offers flexible placement
• Uses an FTDI FT232RL chipset for broad operating system compatibility
• COM retention automatically restores port numbers after unplug or reboot
• Foil and braid shielding helps block EMI and RFI noise
• Compatible with Windows, macOS, and Linux