Product Description

Bently Nevada 125744-02 is a rear-mounted serial I/O module designed for integration with the 3500/92 Communication Gateway. This module provides a dedicated RS422 interface for high-speed, point-to-point serial communication, enabling reliable transmission of machinery data, status, and event logs to external systems such as PLCs or DCS.

Key Features

• RS422 4-wire interface for full-duplex communication

• Built-in internal termination resistors to prevent signal reflections and simplify wiring

• Differential signaling for enhanced noise immunity in high-interference industrial environments

• Supports long-distance data transmission up to 1,200 meters (4,000 feet)

• Configurable baud rates up to 38.4 kbps

• 500 Vdc galvanic isolation from the rack for added system protection

• Compatible exclusively with the 3500/92 Communication Gateway Main Module

Applications

• Direct connection from a 3500 rack to DCS, PLC, or other external monitoring systems

• Long-distance, high-integrity serial links in turbine, compressor, and generator monitoring systems

• Industrial environments with high EMI or electrical noise

Comparison with Related Modules

• 125736-01: Multi-protocol module configurable for RS232 or RS422

• 125744-02: Dedicated RS422 module with internal termination optimized for high-integrity point-to-point communication

Technical Specifications

FAQ

What is the main function of Bently Nevada 125744-02?
It serves as a dedicated RS422 serial interface module for exporting 3500 rack data to external monitoring systems.

Can it be used for long-distance communication?
Yes, RS422 differential signaling allows reliable data transfer up to 1,200 meters (4,000 feet).

Does it support full-duplex communication?
Yes, this module supports full-duplex operation, enabling simultaneous data transmission and reception.

How does internal termination benefit the system?
Internal termination ensures proper impedance matching, prevents signal reflections, and simplifies installation by removing the need for external resistors.