Advantech BB-VESR902D 2 Port Ethernet Serial Server

Advantech BB-VESR902D is a two-port Ethernet-to-serial device server in the VLINX family that converts a 10/100 Mbps Ethernet network to two DB9-connected serial interfaces, designed for DIN-rail mounting in industrial enclosures. Each of the two ports supports RS-232, RS-422, or RS-485 operation (2-wire or 4-wire), enabling flexible communication with a wide range of devices such as PLCs, sensors, and industrial controllers. The device provides a standard RJ-45 Ethernet port for network access and is powered via a DC input for reliable operation in demanding environments. Its compact DIN-rail form factor is intended for panel installations, saving space in control cabinets. As an older model, BB-VESR902D is listed as obsolete by distributors and is no longer manufactured by Advantech, with remaining stock typically found through secondary channels. This combination of dual serial interfaces, multi-mode serial support, and an Ethernet backbone makes it suitable for tasks like remote device management, fieldbus gateway applications, and bridging legacy equipment to modern networks.