RDC USB to UART Bridge (COM21) Driver

The RDC USB to UART Bridge (COM21) driver enables Windows to communicate with Radio Data’s USB-to-UART bridge, allowing compatible software to exchange serial data through a USB connection. It is intended for users who need to connect UART-based equipment, restore a missing serial port, or resolve a driver-related detection problem.

Key Features

• USB-to-serial communication: Provides the driver interface needed for applications to access compatible UART equipment connected through the bridge.
• COM port access: Allows serial communication software to use the device’s assigned port. COM21 is the port shown in this device name; Windows may assign a different number after reconnection or installation.
• Legacy Windows support: Listed supported operating systems include Windows 10, 8.1, 7, Vista, and XP. Choose a package that matches your Windows version and system architecture.
• Device recognition: Helps Windows identify the bridge correctly so you can configure it in Device Manager and select it in your serial application.

How to Install RDC USB to UART Bridge (COM21) Driver

1. Check your system. Confirm your Windows version and whether it is 32-bit or 64-bit. If you are comparing Windows 10/11 compatibility, note that Windows 11 is not included in the supplied supported OS list; verify support before installing.
2. Select a matching package. Before starting an RDC USB to UART Bridge (COM21) driver download for Windows, check the package’s supported systems and device identifiers. Choose the latest version confirmed compatible with your hardware, rather than assuming every newer release will work.
3. Prepare the files. Save and extract the download if necessary. For any free download, verify the source and scan the files with your security software before running them.
4. Install the driver. Follow the included setup instructions. If the package contains driver files without an installer, open Device Manager, locate the bridge or unidentified device, choose Update driver, and browse to the extracted folder.
5. Verify the connection. Restart if prompted, then check Device Manager for the assigned COM port and any warning icons. Select that port in your serial application and set communication parameters to match the connected equipment.

Keep the driver updated when a compatible release addresses connection issues or operating-system changes. Before an update, retain a working driver package or create a restore point so you can recover if the new installation causes problems.