Schneider NW-BM85-000 Modicon Bridge Multiplexer 4-Port

NW-BM85-000 Modicon Bridge Multiplexer

Product Introduction

The Schneider Electric NW-BM85-000 functions as a dedicated bridge multiplexer that streamlines communication across diverse industrial devices. This module operates on a flexible 115/230V AC power supply, making it suitable for various global installations. It provides four RS-232 ports, which allow multiple serial devices to connect through a single network interface. Moreover, this multiplexer supports both Modbus master and Modbus slave roles, adapting to different control architectures. It also offers optional Modbus Plus and gateway connectivity for extended system interoperability. Consequently, the NW-BM85-000 serves as a reliable backbone for data exchange in complex automation environments.

Communication Capabilities

This bridge multiplexer excels at converting and routing messages between different protocol layers. Specifically, the NW-BM85-000 fully supports standard Modbus messaging, ensuring seamless communication with a wide range of field instruments and controllers. Its four RS-232 ports facilitate direct connections to terminals, drives, and human-machine interfaces. Additionally, the unit can operate as a Modbus master to initiate data requests or as a slave to respond to external queries. This flexibility allows engineers to design efficient data acquisition and control networks without replacing existing equipment.

• Total Ports: 4x RS-232 (Serial connectivity)

• Modbus Master Ports: Supported (Initiates communication)

• Modbus Slave Ports: Supported (Responds to requests)

• Modbus Messaging: Fully compliant

• Modbus Plus Option: Available for high-speed peer networks

• Gateway Option: Supports inter-network bridging

Power and Physical Specifications

The NW-BM85-000 is designed for global compatibility with its dual-voltage power input. It accepts either 115V AC or 230V AC, eliminating the need for external step-down transformers in many regions. This module weighs approximately 5.00 lbs (2.27 kg), reflecting its solid construction and reliable components. Its rack-mountable design simplifies integration into standard 19-inch control cabinets or Modicon chassis systems.

• Input Voltage: 115/230V AC (Selectable)

• Weight: 2.27 kg (5.00 lbs)

• Mounting Type: Rack-mountable

• Device Classification: Data Terminal Equipment (DTE)

Connection Guidelines and Cable Types

Proper cabling is essential for reliable performance with the NW-BM85-000. This unit is classified as Data Terminal Equipment (DTE), meaning it expects to connect to Data Communication Equipment (DCE) like modems using a straight-through or modem cable. Conversely, when connecting this DTE device to another DTE device, you must use a null-modem cable with crossed signal lines. For DCE-to-DCE connections, a tail circuit cable interface is required. Following these guidelines prevents communication errors and hardware damage. Always verify your cable type before installation to ensure stable data transmission.

• DTE to DCE: Modem cable or straight-through cable

• DTE to DTE: Null-modem cable (crossed wiring)

• DCE to DCE: Tail circuit cable interface

Installation and Rack Mounting

Installing the NW-BM85-000 is straightforward due to its rack-mountable housing. First, secure the unit into the available rack slots using the provided mounting brackets. Next, connect the AC power source to the appropriate voltage terminals, ensuring the selector switch matches your supply. Then, attach your serial devices to the four RS-232 ports using the correct cable types described above. Finally, configure the Modbus master/slave parameters via the setup software or DIP switches. This structured approach minimizes installation time and reduces the risk of setup errors.

Logistics and Shipping

All orders for the Schneider NW-BM85-000 are dispatched promptly using premium express couriers. Shipments are handled through FedEx, UPS, or DHL to provide real-time tracking and reliable delivery worldwide. Each unit undergoes careful packing to ensure it arrives in optimal condition.

Packaging List

• Schneider Electric NW-BM85-000 Bridge Multiplexer (1 unit)

• Rack mounting brackets and screws

• Anti-static protective bag

• Terminal block connectors (if applicable)

Frequently Asked Questions (FAQ)

1. What is the primary function of the NW-BM85-000 module?
This unit serves as a bridge multiplexer that connects multiple RS-232 serial devices to a Modbus network, enabling centralized data exchange.

2. What power supply does this bridge multiplexer require?
The Schneider NW-BM85-000 accepts a dual-voltage input of 115V AC or 230V AC, making it suitable for various regional power standards.

3. How many devices can I connect to this multiplexer?
It features four RS-232 ports, allowing you to connect up to four serial devices directly, with additional expansion possible through Modbus networks.

4. What cable should I use to connect this unit to a modem?
Since the NW-BM85-000 is a DTE device, you must use a straight-through modem cable when connecting to a DCE device like a modem.

5. Can this module act as both a Modbus master and a slave?
Yes, it supports both Modbus master and slave functionality, providing flexibility for different communication roles within your automation system.