RS-485 Isolated Port (COM9) Driver

The RS-485 Isolated Port (COM9) driver allows Windows to recognize a compatible B&B isolated RS-485 interface and make it available to serial communication software. It is intended for users connecting industrial controllers, meters, sensors, or other RS-485 equipment who need to install the interface or restore communication after a system change. COM9 is the port assignment shown in Windows, not necessarily the adapter’s model number, so confirm the hardware identity before choosing a package.

Key Features

• Enables compatible software to access the RS-485 interface through a Windows COM port.
• Supports serial communication settings used by connected equipment, such as baud rate, parity, and stop bits, where supported by the hardware and application.
• Allows Windows to identify and manage the interface in Device Manager, helping you check its status and assigned port.
• Provides the software link to an isolated RS-485 interface; electrical isolation is a hardware feature, not something added by the driver.

How to Install RS-485 Isolated Port (COM9) Driver

1. Identify your adapter. In Device Manager, locate the interface under Ports (COM & LPT) or Other devices. Check Properties > Details > Hardware Ids, and compare those identifiers with the driver package’s supported hardware.
2. Check Windows compatibility. Listed operating systems are Windows 10, 8.1, 7, Vista, and XP. Select the appropriate 32-bit or 64-bit package. For Windows 10/11 systems, verify support separately: Windows 11 compatibility is not established by this listing.
3. Choose the correct package. Before starting your RS-485 Isolated Port (COM9) driver download for Windows, confirm the source and supported model. A free download should still be checked for authenticity and compatibility; the latest version may not support every older Windows release.
4. Install the driver. Extract the downloaded archive if needed, then follow the included setup instructions. If no installer is provided, use Device Manager’s Update driver option and browse to the extracted driver folder.
5. Verify communication. Restart if requested, check that the port appears without a warning icon, and select its assigned COM number in your application. Match the serial settings to your connected equipment.

Keep the driver updated when a compatible release addresses a problem or improves support for your system. Before an update, note your working port settings and retain the previous installer so you can recover if communication stops working.