Brother MFC-850CDN USB Remote Setup Port (COM4) Driver

The Brother MFC-850CDN USB Remote Setup Port (COM4) driver helps Windows recognize the USB communication interface used for remote setup of your Brother device. It is intended for users who need to configure the connected machine from their computer or resolve a missing or unrecognized remote setup port.

Key Features

• Remote setup communication: Supports the USB interface used by compatible Brother setup software to communicate with the device.
• Port recognition: Helps Windows identify the remote setup interface in Device Manager. Although the device name includes COM4, Windows may assign a different COM number.
• Legacy Windows support: Listed operating systems include Windows 10, 8.1, 7, Vista, and XP. Choose a package that explicitly supports your Windows version and system architecture.
• Focused driver functionality: This entry concerns the remote setup port, not a camera capture driver or a replacement for the full printer and scanner software package.

How to Install Brother MFC-850CDN USB Remote Setup Port (COM4) Driver

1. Check your Windows system. Confirm your operating system and whether it is 32-bit or 64-bit. If comparing Windows 10/11 compatibility, note that Windows 11 is not included in this entry’s supported OS list.
2. Select a compatible package. Before starting the Brother MFC-850CDN USB Remote Setup Port (COM4) driver download for Windows, verify the model, supported systems, and publisher. Choose a trusted free download rather than a third-party tool that requires payment to install drivers.
3. Prepare the USB connection. Turn on the Brother device and follow the package’s instructions about when to connect the USB cable. Avoid disconnecting the device during installation.
4. Install the driver. Extract the downloaded files if necessary, then run the supplied installer. If the package contains only driver files, use Device Manager’s Update driver option and browse to the extracted folder.
5. Confirm operation. Restart Windows if prompted, check that the remote setup interface appears without a warning icon in Device Manager, and test communication using compatible Brother remote setup software.

Keep the driver updated when Brother provides a compatible release that addresses your needs. Check the latest version against your installed driver before you update, and retain a working installer in case you need to restore the previous setup. A newer package is useful only when it supports your exact device and Windows configuration.

Common Issues and Fixes

• Install fails or COM4 is missing: Disconnect the USB cable, run the Brother installer as administrator, reboot, then reconnect directly to a rear USB port—not a hub. Check Device Manager for an unknown USB device or a yellow warning on the Remote Setup Port.
• Device not detected / Remote Setup cannot connect: Confirm the MFC-850CDN is powered on and use a known-good USB cable. Close software that may hold COM4 open, then select the correct Brother USB Remote Setup Port in Remote Setup.
• Version or COM-port conflicts: Uninstall older Brother drivers/software and remove stale COM ports in Device Manager. Reinstall the latest MFC-850CDN package; do not force a generic USB-serial driver. If Windows assigns a new COM number, update Remote Setup’s port setting.