Advantech BB-485USBTB-2W USB To RS-485 2 Wire Signal Converter

The Advantech BB-485USBTB-2W is a USB-to-RS-485 2-Wire Converter that lets a host computer, PLC, or industrial controller communicate with RS-485 devices over a single USB connection. On the host side it uses a USB 2.0 interface, while the RS-485 side provides a two-wire differential port terminated by a plug‑in terminal block for A/B wiring. The 2W designation identifies two-wire, RS-485 half‑duplex signaling suitable for multi‑point networks common in industrial environments. This model is part of Advantech’s BB-485USBTB family, which also includes the BB-485USBTB-4W and locked-serial-number LS variants, offering options for different wiring needs and deployment constraints. Typical applications span industrial automation, data acquisition, building management, and equipment interfacing where a USB host must control or collect data from RS-485 devices such as sensors, actuators, or motor controllers. The device is designed as a compact, plug‑in solution that integrates with standard USB hosts and simplifies adding RS-485 connectivity to existing control or monitoring systems without requiring a separate RS-485 controller.