Product Details

Modicon BM85S232, also known as NW-BM85S232, is a professional modbus plus bridge and reliable rs232 multiplexer designed to connect RS232 serial devices to Modbus Plus industrial network. This programmable gateway supports multiple RS232 serial ports and can run custom communication logic to realize protocol conversion, data routing and device multiplexing. It links serial instruments, terminals, printers and legacy serial controllers into the Modbus Plus peer-to-peer network, allowing the main PLC to access serial data without occupying CPU serial resources. Built for continuous round-the-clock factory operation, this modbus plus bridge provides flexible baud rate, parity and handshake configuration for each channel. As a discontinued legacy spare, this rs232 multiplexer serves as a drop-in replacement to rebuild serial network integration for ageing Modicon automation systems.

Basic Parameters

Brand: Modicon

Model: BM85S232 (NW-BM85S232)

Product Type: Programmable Modbus Plus Bridge / RS232 Multiplexer Gateway

Network: Modbus Plus peer communication network

Serial Interface: Multiple programmable RS232 ports

Power Supply: 115 / 230 VAC or 24 VDC

Mounting: Panel or shelf mounting

Supported Protocol: Modbus ASCII, Modbus RTU, user-defined serial frames

Indicator: Onboard LED for power, network status and serial port activity

Product Status: Discontinued legacy spare

Net Weight: Approximately 1.3 kg

Supported Functions

This modbus plus bridge supports bidirectional data forwarding between Modbus Plus bus and RS232 serial channels. The rs232 multiplexer executes serial data parsing, checksum processing and programmable message routing. This programmable gateway enables multi-serial-device sharing of one Modbus Plus network node, supports baud rate and communication parameter configuration, and provides built-in self-diagnosis for network faults, port break and frame errors. It can store user communication programs locally and resume data transfer automatically after power restoration, greatly simplifying the integration of old serial equipment into distributed control systems.

Core Functions

As a dedicated programmable gateway, this modbus plus bridge converts serial RS232 data into Modbus Plus network packets and forwards network commands down to serial field devices. It acts as a communication concentrator to multiplex several serial links onto one industrial bus and isolates serial side interference from the Modbus Plus backbone. This rs232 multiplexer serves as a direct spare to restore serial-network interconnection capability for ageing Modicon automation racks.

Hardware Specifications & Environmental Features

Operating Temperature: -10°C ~ +60°C

Storage Temperature: -20°C ~ +70°C

Relative Humidity: 5%–95%, non-condensing

Housing: Rugged metal enclosure for panel installation

Protection: Serial port ESD and transient surge suppression

Anti-interference: Isolated communication circuits for ground loop noise reduction

Compatibility: Works with Modicon 984, Quantum and other Modbus Plus compatible controllers

Industry Applications: Applied in legacy petrochemical distributed control, old paper making production automation, material handling conveyor lines, packaging and textile machinery, water treatment remote signal collection and large conveyor remote I/O control racks.

Note: Confirm Modbus Plus node address, serial baud rate, data bit and parity setting before ordering.

This is from our current stock.

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