Example: Read battery voltage (register 0x1000): 01 03 10 00 00 01 87 04
Change the USB cable (use a short, shielded cable). Try a different USB port on your laptop. Verify the UMPT board status LEDs are active. IP mismatch or firewall block.
Windows 11 (Requires disabling driver signature enforcement in some legacy driver packages) Prerequisites Administrative privileges on the host laptop.
This article provides a comprehensive guide to understanding, downloading, and installing the necessary drivers to ensure seamless communication between your computer and the BBU3900. What is the BBU3900 USB Driver? bbu3900 usb driver
If the laptop completely fails to recognize that a cable has been plugged in, the issue is typically physical.
Open an authorized browser (Internet Explorer mode or specialized Chrome/Firefox builds provided in the LMT toolkit) and type https://192.168.0.49:3337 to launch the WebLMT login portal. Configuring CLI Access (Serial Mode) If the driver mapped the BBU to a COM port:
Issue 3: Driver Installs Successfully, But Ping to 192.168.0.1 Fails Example: Read battery voltage (register 0x1000): 01 03
The console cable (USB-to-serial) may not have the correct driver installed on your PC. While the BBU3900 does not require a custom driver, the USB-to-serial adapter does. Ensure you install the driver for your specific USB-to-serial converter chip (e.g., FTDI, Prolific). You can find the correct driver by checking the USB VID&PID in Device Manager.
The in your BBU3900 (e.g., UMPT, GTMU) The exact error message or behavior you are encountering
What (e.g., Windows 10, Windows 11) is your maintenance laptop running? IP mismatch or firewall block
For authorized engineers, the most secure source is the Huawei Support Enterprise Portal . How to Install and Connect
Open and check the exact COM port number assigned (e.g., COM3 ). Launch PuTTY or SecureCRT . Change the connection type to Serial .
Power on the Huawei BBU3900 and wait for the RUN indicator light on the LMPT/UMPT board to flash slowly (1s on, 1s off), indicating normal operation. Connect your laptop to the BBU's USB port using your cable.
Once the driver is active, you must configure your network settings to talk to the BBU. Open > Change adapter settings .
Disable third-party corporate firewalls or VPN software. Manually set your Virtual NIC IP address if DHCP fails. Windows Power Saving feature.