Bently Nevada 125768-01 RS485 Serial I/O Module 3500 Series

Product Description

Bently Nevada 125768-01 is a rear-mounted I/O module engineered for the 3500/92 Communication Gateway. Designed for high-reliability industrial data acquisition, this module provides RS485 serial connectivity to link multiple 3500 racks or interface with PLCs, DCS, or SCADA systems via Modbus RTU protocol. Its integrated termination and differential signaling ensure robust, long-distance communication in electrically noisy environments.

Key Features

• RS485 serial communication interface for multi-drop network configurations

• Supports standard baud rates up to 38.4 kbps or higher depending on system setup

• Differential signaling enhances noise immunity near motors, switchgear, or EMI-prone areas

• Integrated termination resistors simplify installation and prevent signal reflections

• 500 Vdc galvanic isolation from the rack for improved system reliability

• Operating temperature range: -30°C to +65°C (-22°F to +150°F)

• Connection via terminal blocks or D-sub connectors depending on configuration

Applications

• Multi-rack monitoring systems

• Distributed control rooms in large industrial plants

• Integration with PLC, DCS, or SCADA networks for vibration, position, and status data collection

Comparison with Related Modules

• 125720-01: Ethernet interface (Modbus/TCP)

• 125736-01: RS232/RS422 serial interface (point-to-point)

• 125768-01: RS485 serial interface optimized for long-distance multi-drop networks

Technical Specifications

FAQ

What is the function of Bently Nevada 125768-01?
It serves as a serial I/O interface module for the 3500/92 Communication Gateway, enabling RS485 multi-drop communication with PLCs, DCS, or SCADA systems.

Can it connect multiple 3500 racks on one bus?
Yes, the RS485 interface supports multi-drop network architecture for multiple racks.

What is the difference between 125768-01 and 125736-01?
125736-01 uses RS232/RS422 point-to-point communication, while 125768-01 is designed for long-distance, multi-drop RS485 networks.

What is the operating temperature range?
-30°C to +65°C (-22°F to +150°F).