Standard Serial over Bluetooth link (COM65) Driver

The Standard Serial over Bluetooth link (COM65) driver lets Windows present a compatible Bluetooth serial connection as a virtual COM port, allowing software to communicate with a paired device. This Microsoft component is useful when connecting equipment that uses the Bluetooth Serial Port Profile, such as certain scanners, diagnostic tools, or serial adapters. COM65 identifies the assigned port on your computer, not a separate hardware model.

Key Features

• Virtual serial communication: Enables compatible applications to exchange data with Bluetooth devices through a COM-port interface.
• Windows integration: Works with the Windows Bluetooth stack to support serial connections without a physical serial cable.
• Application compatibility: Allows software with serial-port support to use COM65 when that port is correctly assigned and configured.
• Device management: Makes the virtual port accessible through Device Manager for checking its status and troubleshooting connection issues.

How to Install Standard Serial over Bluetooth link (COM65) Driver

1. Check your Windows version and Bluetooth adapter. Listed operating systems are Windows 10, 8.1, 7, Vista, and XP; availability depends on the Bluetooth hardware and installed stack. If you are comparing Windows 10/11 instructions, do not assume Windows 11 compatibility from this listing.
2. Pair the Bluetooth device. Turn on Bluetooth, make the accessory discoverable, and complete pairing in Windows. The accessory must support a serial service for a virtual COM port to be created.
3. Choose a trusted driver source. Before starting a Standard Serial over Bluetooth link (COM65) driver download for Windows, check Windows Update and your Bluetooth adapter manufacturer’s support resources. This Microsoft component is typically supplied through Windows rather than a separate device-specific installer. Be cautious of third-party “free download” offers.
4. Install or update the relevant driver. Open Device Manager and look under Ports (COM & LPT) and Bluetooth. If the entry exists, use its driver-update option; otherwise, resolve any Bluetooth adapter errors and pair the accessory again.
5. Verify the connection. Check the assigned COM number in Device Manager, then select that same port in your application. If Windows assigns a number other than COM65, use the actual port shown.

Keep the Bluetooth adapter driver and Windows components updated to maintain reliable communication. Choose the latest version compatible with your operating system and hardware, rather than assuming the newest package supports older Windows releases. If an update causes problems, use Device Manager’s rollback option when available.

Common Issues and Fixes

• Install fails or rolls back: Remove existing “Standard Serial over Bluetooth link” entries for COM65 in Device Manager (enable View > Show hidden devices), reboot, then let Windows reinstall the Microsoft Bluetooth serial driver. Do not force an unsigned or mismatched INF.
• Device not detected / COM65 missing: Confirm Bluetooth is on and the remote device is paired and supports the Serial Port Profile (SPP). Remove and re-pair the device, then scan for hardware changes in Device Manager. Verify the Bluetooth Support Service is running.
• COM port conflict or version mismatch: If COM65 is duplicated or in use, open Device Manager > Ports (COM & LPT) > Port Settings > Advanced and assign a free COM number. Update the Bluetooth adapter driver from the PC vendor; keep the Microsoft serial driver unless the vendor explicitly requires another version.