StarTech.com 3ft (91cm) 1-Port USB to RS232 DB9 Serial Adapter Cable, USB to Serial Adapter Cable - M/M

The StarTech ICUSB232SM3 3 ft (0.9 m) USB to RS232 DB9 serial adapter cable connects computers with an available USB port to DB9 RS232 serial devices. It provides a DB-9 male connector on one end and a USB 2.0 A male connector on the other, enabling communication with legacy serial peripherals from modern Mac or PC systems. The cable uses a converter chip located at the USB end, which allows longer serial extension lengths than converters placed at the DB9 end.

Advantages

The converter chip placed at the USB end overcomes the 15 ft USB limitation, enabling the use of longer DB9 serial extension cables when required. The 0.9 m cable offers durability and flexibility with a blue transparent jacket, and the cable is simple to install with plug-and-play compatibility on most systems. The adapter provides a cost-effective way to bridge modern computers and older RS232 devices, and it is backed by StarTech.com lifetime warranty and free lifetime technical support.

Suitable for

• Connecting legacy RS232 serial devices (DB9) to laptops or desktops via USB
• Point-of-sale equipment, industrial control devices, and instrumentation with DB9 serial ports
• Extending serial connections using a DB9 extension cable beyond typical USB length limits

Key specifications

• Manufacturer: StarTech
• Model: ICUSB232SM3
• MPN: ICUSB232SM3
• EAN: 0065030842440
• Cable type: USB 2.0 A (male) to RS232 DB9 (male)
• Cable length: 3 ft / 0.9 m
• Converter location: USB end (integrated converter chip)

How to use

Connect the USB A male end to an available USB port on your Mac or PC. Plug the DB9 male connector into the serial device's DB9 female port. Install any required drivers if prompted by the operating system; many systems will detect the adapter automatically. If longer reach is needed, attach a compatible DB9 extension cable to the DB9 connector—long extensions are possible because the converter is at the USB end.

Recommendations

Use a properly shielded DB9 extension cable and avoid routing the serial cable near high-voltage or high-frequency sources to maintain signal integrity. Confirm driver availability for your operating system before deployment and consider testing communication settings (baud rate, parity, data bits, stop bits) to match the connected serial device.