USB to Serial RS232 Adapter Cable StarTech.com ICUSB2321FIS

The StarTech.com ICUSB2321FIS USB to Serial RS232 Adapter Cable converts a USB 1.1 or 2.0 port into a DB9 RS232 serial port, providing a 2.5 m cable with DB-9 and USB-A connectors and integrated optical isolation for protection against electrical interference. The adapter uses an FTDI chipset that supports COM retention and broad OS compatibility including Windows, Windows CE, Mac OS and Linux. It is USB powered and designed for connecting, monitoring and controlling serial devices in mixed or industrial environments.

Advantages

The adapter includes optical isolation and surge protection to safeguard sensitive serial equipment from electrical damage. The FTDI chipset offers enhanced compatibility and customization options not commonly available in other adapters. Its USB-powered, compact design eliminates the need for an external power supply, and the 2.5 m cable length provides flexibility for installation.

Suitable for

• Connecting industrial PLCs, sensors and controllers to a computer
• Serial device monitoring and troubleshooting
• Point-of-sale systems and legacy equipment integration
• Environments where electrical isolation is required to protect sensitive equipment

Key specifications

• Model: StarTech.com ICUSB2321FIS
• Interface: USB 1.1/2.0 to RS232 (DB9)
• Cable length: 2.5 m
• Connector types: USB-A to DB-9 male
• Chipset: FTDI (supports COM retention and customization)
• Features: Optical isolation and surge protection
• Power: USB-powered (no external adapter required)
• Compatibility: Windows, Windows CE, Mac OS, Linux
• MPN: ICUSB2321FIS
• EAN: 065030845373

How to use

Install the appropriate FTDI driver for your operating system if required, connect the USB-A end to an available USB 1.1 or 2.0 port on your computer and attach the DB9 connector to the serial device. Configure the serial port settings (baud rate, parity, data bits, stop bits) in your terminal software or application to match the connected device. The adapter is USB powered and ready for immediate use once drivers are loaded and port settings are configured.

Usage recommendations

For best results in industrial installations, route the 2.5 m cable away from high-voltage lines and heavy electrical equipment. Ensure drivers are kept up to date and verify COM port assignments after connecting multiple USB-to-serial adapters to avoid conflicts.