The Casio MySync USB Cable Comm Port (COM4) driver allows Windows to recognize the Casio USB connection as a communication port so compatible software can exchange data with a connected device. Although listed in the Printer category, this entry refers to a communications interface rather than a standard print driver. For Windows 11, 10, 8, or 7, choose a driver package that explicitly supports your Windows version and system architecture.

Key Features

• USB communication support: Provides the interface needed for compatible Casio software to communicate through the MySync USB cable.
• COM port identification: Lets Windows expose the connection as a serial communication port, which applications can select when configuring a connection.
• Device recognition: Helps resolve a missing-driver warning when the cable is detected but its communication interface is not correctly installed.
• Connection configuration: Makes the installed port available in Device Manager, where you can check its status and assigned COM number. The number may differ from COM4 on another computer.

How to Install

1. Check your Windows configuration. Open your system information to confirm whether you use Windows 11, 10, 8, or 7, and check the system architecture. Verify that the download supports both your operating system and the Casio MySync USB cable.

1. Download and prepare the driver. Save the package locally and extract it if it is compressed. Review any included instructions before connecting the cable, since some installers require the software to be installed first.

1. Run the installer or use Device Manager. If the package includes a setup program, follow its prompts. Otherwise, connect the cable, locate the unrecognized device in Device Manager, select Update driver, and browse to the extracted driver folder.

1. Confirm the port is available. After installation, look under Ports (COM & LPT) in Device Manager. Check that the Casio communication interface appears without a warning icon and note its assigned COM number.

1. Configure your Casio software. Select the matching COM port in the compatible application, then test communication with the connected device. If the connection fails, verify the port selection, reconnect the cable, and restart Windows if the installer requests it.

If Windows rejects the driver, check for a compatible, properly signed package rather than disabling driver-signature protection.

Common Issues and Fixes

• Install fails or rolls back: The MySync cable driver is older and may need Administrator rights and Windows compatibility mode. If Windows blocks it as unsigned, temporarily disable driver signature enforcement, install, then re-enable it.
• Device not detected / COM4 missing: Check Device Manager under Ports (COM & LPT) and show hidden devices. Try another USB port; if Windows assigns COM5 or higher, either select that port in the app or set the MySync USB Cable Comm Port to COM4 under Port Settings > Advanced.
• Version or COM-port conflict: Uninstall previous Casio/MySync and generic USB-serial drivers, reboot, then reinstall the matching package. Confirm no other device is using COM4 before assigning it.