Yokogawa NFLR121-S00 STARDOM RS-422/RS-485 Serial Communication Module

Product Overview

The Yokogawa NFLR121-S00 functions as a high-speed serial communication interface for FCN (Field Control Node) autonomous controllers. This module enables the STARDOM system to integrate with diverse third-party industrial hardware, including motor drives, power meters, and specialized analytical instruments. By supporting both RS-422 and RS-485 protocols, the NFLR121-S00 facilitates robust, multi-drop data exchange over long distances. We supply this module as 100% Brand New and original, ensuring factory-certified data integrity for your critical process control network.

Part Number Breakdown

Yokogawa utilizes the following nomenclature for the NFLR121 series to specify communication standards and hardware revisions:

Technical Specifications

The NFLR121-S00 delivers high-bandwidth serial transmission with integrated electrical protection.

• Communication Protocol: RS-422 / RS-485

• Data Transfer Rate: Up to 1.85 Mbps

• Number of Channels: 1

• Transmission Distance: Up to 1200 meters

• Isolation: Transformer isolation (Internal logic to field)

• Character Length: 7 or 8 bits (Configurable)

• Parity Check: None, Even, or Odd

• Connector Options: D-sub 9-pin (female) or Terminal block with M4 screw clamps

• Current Consumption: 500 mA

• Weight: 0.3 kg

• Condition: 100% Brand New and Original

Engineering Advantages

The NFLR121-S00 solves complex integration challenges in distributed automation environments:

• High-Speed Long-Distance Link: While standard serial links often struggle with speed over distance, this module maintains rates up to 1.85 Mbps. It extends your control network reach up to 1200 meters, allowing the FCN controller to manage remote field devices without signal repeaters.

• Transformer-Based Signal Isolation: Integrated transformer isolation physically decouples the communication line from the FCN backplane. This prevents ground loops and protects the central processor from high-voltage surges or electrical noise common in industrial motor control centers.

• Versatile Physical Termination: The module supports two distinct connection methods. The D-sub 9-pin connector allows for rapid plug-and-play integration with standard devices, while the M4 screw clamp terminal block provides a vibration-proof, high-torque connection for permanent field wiring.

• Flexible Protocol Configuration: Through software settings, engineers define parity, stop bits, and character lengths. This flexibility ensures the NFLR121-S00 communicates seamlessly with legacy proprietary devices and modern Modbus-compatible hardware alike.

FAQs

How do I switch between RS-422 and RS-485 modes on the NFLR121-S00?

The module determines the communication mode based on your wiring configuration and software parameters within the STARDOM configuration tool. Ensure your cable termination matches the 4-wire (RS-422) or 2-wire (RS-485) requirements of your field device.

Does this module require external termination resistors for RS-485?

Yes. For long-distance transmissions or high-speed links near 1.85 Mbps, you must install appropriate termination resistors (typically 120 ohms) at both ends of the segment. This prevents signal reflections that cause data corruption.

Can the NFLR121-S00 support multi-drop networks?

Absolutely. In RS-485 mode, the module manages multi-drop configurations, allowing a single FCN controller to communicate with multiple slave devices on a single twisted-pair cable, significantly reducing wiring costs.

What is the advantage of transformer isolation over optical isolation?

Transformer isolation provides superior common-mode rejection and handles higher voltage transients more effectively in RS-422/485 environments. This ensures the communication link remains stable even in the presence of heavy electromagnetic interference.