USB to RS232 Serial Adapter Cable StarTech ICUSB232DB25 — USB Type-A to DB9/DB25, 0.9 m, grey

The StarTech ICUSB232DB25 USB to RS232 Serial Adapter Cable provides a direct connection between a computer's USB Type-A port and legacy RS232 serial devices using either a DB9 or DB25 male serial termination. The integrated 0.9 m (3 ft) grey cable and included DB9-to-DB25 adapter enable straightforward serial communication, configuration, diagnostics and data transfer with equipment that requires a standard RS232 interface. The adapter is compact, CE and RoHS compliant, and designed for use where a native serial port is unavailable.

Advantages

This adapter cable supports both 9-pin and 25-pin serial connections via the supplied adapter, eliminating the need for separate cables. The integrated cable removes the requirement for an additional USB-to-serial dongle plus serial lead, simplifying installation. It offers plug-and-play and hot-swap support for quick deployment and minimal system interruption. Compliance with CE and RoHS standards ensures it meets common regulatory and environmental requirements for industrial and commercial use.

Suitable for

• Connecting industrial controllers and automation equipment to modern PCs
• Point-of-sale (POS) systems and retail peripherals requiring serial ports
• Networking gear, modems and console ports for configuration and diagnostics
• Embedded devices, measurement instruments and legacy hardware with DB9 or DB25 interfaces

Key specifications

• Connection type: USB Type-A (male) to RS232 (DB9 male) with DB25 adapter included
• Cable length: 0.9 m (3 ft) integrated cable
• Color: grey
• Supported functions: serial data communication, configuration and diagnostics over RS232
• Standards and compliance: CE and RoHS compliant

How to use

Plug the USB Type-A connector into an available USB port on your computer and attach the DB9 male connector to the RS232 device. If a DB25 interface is required, attach the supplied DB9-to-DB25 adapter to the DB9 connector and then connect to the device. The adapter supports plug-and-play operation on most systems; if necessary, install the appropriate driver provided by the device manufacturer or available from StarTech to enable full serial functionality. Ensure the serial device and host use compatible communication parameters (baud rate, parity, data bits, stop bits) before starting data transfer.

Usage recommendations

For reliable communication, use the shortest practical cable routing to avoid interference, verify ground connections on industrial equipment, and confirm serial settings match on both ends. If encountering connectivity issues, check driver installation and try a different USB port or host device. This adapter is intended for RS232-level serial signals and should not be used where higher voltage or specialized serial standards are present.