Tripp Lite U209-005-COM Usb to Serial RS-232 Adapter

Product Description

The TRIPP LITE U209-005-COM is a USB to serial RS-232 adapter cable designed to connect modern computers and laptops to RS-232 serial devices. Built around FTDI chipset technology, this adapter provides a reliable serial communication interface where a native COM port is unavailable. It is a practical solution for technicians and field service professionals who need to program, configure, or communicate with HVAC controllers, PLCs, building automation equipment, and other legacy serial devices using a current USB-equipped computer.

This adapter is suited for residential and commercial service environments where RS-232 communication is still required. Common applications include connecting laptops to serial console ports on rooftop units, boiler controllers, VFDs, and similar equipment that uses legacy serial protocols. It functions as a virtual COM port, making it compatible with standard terminal emulation and configuration software used across multiple trades.

Key Features

• FTDI chipset for stable virtual COM port operation
• Converts USB to RS-232 serial interface
• Supports legacy serial device communication without a native COM port
• Compact inline adapter form factor for field use
• Compatible with standard terminal and configuration software

Compatibility

Designed as an OEM-style replacement or standard interconnect adapter for applications requiring USB to RS-232 serial conversion on devices equipped with a standard DB9 serial port.

Installation Notes

Installation is typically performed by HVAC technicians, electricians, or field service professionals configuring serial-enabled equipment. Connect the USB end to an available USB port on the host computer and the RS-232 end to the target device before launching configuration software. No tools are required, but driver installation may be necessary depending on the host operating system. Power down or place serial-connected equipment in a safe service mode before initiating configuration changes.