Yokogawa NFLR121-S50 Serial Communication Module

Overview

The Yokogawa NFLR121‑S50 is a high-reliability serial communication module engineered for FCN autonomous controllers. It provides two fully isolated RS‑422/RS‑485 ports, ensuring stable multipoint communication across industrial networks. Supporting both half-duplex and full-duplex transmission, this module accommodates a wide range of baud rates and long-distance cabling requirements, making it ideal for PLC integration and distributed control systems.

Key Features

• Dual RS‑422/RS‑485 ports with electrical isolation

• Supports half-duplex and full-duplex modes

• Flexible baud rates: 0.3 kbps to 115.2 kbps

• Transmission formats: ASCII and Binary

• Character length options: 7 or 8 bits, with 1 or 2 stop bits

• Parity selection: None, Even, or Odd

• Maximum cable length: up to 1200 m for RS‑422/RS‑485 networks

• Robust industrial design with reliable long-term performance

Technical Specifications

Interface & Communication

Physical & Environmental

Functional Overview

The NFLR121‑S50 enables reliable serial communication for PLCs, analyzers, and field devices. Its isolated ports protect against electrical interference, and its versatile configuration supports both legacy and modern serial equipment. The module is fully compatible with Yokogawa STARDOM FCN controllers and distributed control networks.

Applications

• Serial communication with PLCs and controllers

• Instrument and analyzer data interfacing

• Distributed control system (DCS) integration

• Multipoint RS‑485 industrial device networks

FAQ / Engineer Insights

Q: Can this module communicate with standard PLCs?
A: Yes, the NFLR121‑S50 is fully compatible with standard RS‑422/RS‑485 PLC interfaces.

Q: What is the maximum cable length supported?
A: Up to 1200 m for RS‑422/RS‑485, depending on baud rate and cable type.

Q: Are both full-duplex and half-duplex modes supported?
A: Yes, both modes are configurable to match network requirements.

Q: Can it handle mixed ASCII and binary data?
A: Yes, the module supports both ASCII and binary transmission.

Q: Are there similar modules for comparison?
A: The NFLR122-S50 offers additional port isolation and higher throughput, while the NFLR121-S50 emphasizes flexible baud rates and long-distance communication.