AEG Modicon NW-BM85-000 BridgeMux Network Module

The Schneider Electric NW-BM85-000 Bridge Multiplexer is a four-port RS-232 gateway that acts as a Modbus Plus bridge between a Modbus Plus network and other serial devices, enabling Modbus Master and Modbus Slave communications across segments. Powered from dual-voltage 115/230 V AC and designed for 19-inch rack mounting, the unit weighs about 5 lb (2.27 kg) and is built for industrial environments. It provides four RS-232 ports that can be configured for Modbus Master or Modbus Slave operation and supports Modbus messaging, with Modbus Plus connectivity as a gateway function. For wiring, use modem cables for DTE-to-DCE connections and null-modem cables for DTE-to-DTE links, and the device is typically configured as Data Terminal Equipment (DTE). Typical applications include bridging Modbus Plus networks to Modbus RTU/ASCII devices in legacy automation setups, enabling communications between Schneider Modicon controllers and field devices.