The AT91 USB to Serial Converter (COM23) driver allows Windows to communicate with compatible AT91-based hardware through a virtual serial port. Although listed in the Printer category, this device acts as a USB-to-serial interface rather than a standard printer driver, enabling software to exchange data with connected equipment.

Key Features

• Virtual COM port access: Provides a serial connection over USB so applications can communicate with the device using a COM port.
• Device recognition: Helps Windows identify the connected converter and associate it with the appropriate driver.
• Serial application support: Makes the connection available to compatible terminal programs, configuration utilities, and other software that uses serial communication.
• Windows installation options: For Windows 11, 10, 8, or 7, choose a package from the manufacturer that explicitly supports your operating system and system architecture.

How to Install

1. Confirm the hardware and Windows version. Open Device Manager and locate the converter, which may appear under Ports (COM & LPT) or Other devices. If necessary, check its hardware IDs under Properties > Details to confirm that the driver matches your device.

1. Download the appropriate package. Select the manufacturer’s driver intended for your version of Windows and architecture, such as 32-bit or 64-bit. Extract the download if it is supplied as a compressed archive.

1. Install the driver. Run the included installer and follow its instructions. If no installer is provided, right-click the device in Device Manager, select Update driver, choose Browse my computer for drivers, and point Windows to the extracted folder.

1. Reconnect and verify. Restart Windows if prompted, then reconnect the converter. Check that it appears without a warning icon in Device Manager. The port may be shown as COM23, but Windows can assign a different number depending on your system.

1. Configure your application. Select the COM port displayed in Device Manager within your communication software. Use the baud rate, parity, and other serial settings required by the connected equipment.

If the device is not detected, try another USB port and a known-good data cable. A driver installation alone does not guarantee compatibility with every AT91-based product; the package must match the specific hardware.

Common Issues and Fixes

• Install fails or shows Code 10/28: Run the manufacturer’s AT91 USB-serial installer as administrator and match it to your Windows architecture. Remove any forced generic CDC/USB-serial driver first; if Windows blocks installation, check driver signing rather than repeatedly reinstalling.
• Device not detected / COM23 missing: Use a known data-capable USB cable and a direct USB port, power-cycle the converter, then check Device Manager under Ports (enable hidden devices). If it appears with a warning, uninstall it and rescan.
• COM port or driver version conflicts: Uninstall older Atmel/USB-serial drivers and hidden COM entries, reboot, then reinstall. If COM23 is busy, close the serial app or reassign the port under Device Manager > Port Settings > Advanced.