Product Description

Bently Nevada 125792-01 is a rear-mounted serial communication module engineered for the 3500/92 Communication Gateway. This module is crucial for transmitting precise machinery data to external systems such as DCS, PLC, or SCADA networks while maintaining the high reliability required for machinery protection systems.

Key Features

• Supports RS232 for short-distance connections and RS422 for long-range serial communication up to 1,200 meters

• Built-in internal termination resistors ensure signal integrity and simplify installation

• Differential signaling provides superior immunity to electrical noise

• Fully compatible with Modbus RTU and ASCII protocols

• Enables real-time streaming of machinery data, including vibration, speed, alarm, and status signals

• Galvanic isolation protects the 3500 rack from voltage surges and ground loops

• Compact rear-mount design fits directly behind the 3500/92 main processor module

Applications

• Connecting 3500 racks to remote DCS or PLC systems where serial infrastructure is in place

• Environments requiring secure, air-gapped communication without Ethernet connectivity

• Integration into existing 3500 series monitoring networks for machinery protection

Comparison with Similar Modules

• 125720-01: Ethernet-based communication module for Modbus/TCP networks

• 125792-01: Dedicated serial module for RS232/RS422, ideal for long-distance or secure connections

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

Technical Specifications

FAQ

What types of signals can the 125792-01 transmit?
It transmits digital keyphasor signals, speed/frequency data, vibration, and alarm statuses for real-time monitoring.

What is the maximum cable length for RS422 communication?
RS422 allows reliable transmission up to 1,200 meters (4,000 feet).

Does the module require external termination resistors?
No, the 125792-01 includes internal termination resistors for simplified installation.

Can it be used in air-gapped systems?
Yes, it is ideal for secure, non-Ethernet serial connections.