Sierra Wireless AT Command Port (UMTS) (COM9) Driver

The Sierra Wireless AT Command Port (UMTS) (COM9) driver lets Windows communicate with the AT command interface of a compatible Sierra Wireless cellular modem. It is intended for users who need to restore a missing modem control port, resolve a driver-related Device Manager warning, or use software that sends AT commands to the modem.

Key Features

• AT command communication: Provides the serial-port interface used by compatible applications to query modem status, read device information, and manage supported modem settings.
• Device recognition: Helps Windows identify the modem’s AT command port rather than leaving it listed as an unknown device.
• Cellular modem integration: Supports the control interface within a compatible Sierra Wireless driver package. Mobile data connectivity may require additional modem or network-interface components.
• Legacy Windows support: Relevant packages support Windows 10, 8.1, 7, Vista, and XP, depending on the modem model and driver release. Select the package that matches your hardware and Windows architecture.

How to Install Sierra Wireless AT Command Port (UMTS) (COM9) Driver

1. Identify your hardware and operating system. Open Device Manager, locate the Sierra Wireless port or unidentified device, and check its hardware IDs under Properties > Details. Confirm your Windows version and whether it is 32-bit or 64-bit.
2. Choose a matching package. Before starting a Sierra Wireless AT Command Port (UMTS) (COM9) driver download for Windows, verify the supported modem models and operating systems. Choose the latest version compatible with your device, not simply the newest package available. For a free download, prefer an official manufacturer or computer-vendor source.
3. Install the driver. Extract the downloaded archive if necessary, then run the supplied installer. If no installer is included, use Device Manager’s driver update option and browse to the extracted driver folder.
4. Reconnect and restart if prompted. Follow the installer’s instructions for connecting the modem. Restart Windows if requested to complete setup.
5. Verify the port. Check Device Manager for a Sierra Wireless AT command port without warning icons. Windows may assign a number other than COM9; select the actual port in your modem-management software.

Keep the driver updated when a compatible release addresses connection or recognition issues. For Windows 10/11 systems, check compatibility carefully: Windows 10 support does not establish Windows 11 support, and Windows 11 is not listed here as a supported operating system. Before an update, retain the working installer so you can revert if needed.