Product Description

The NFLR121-S50 S1 is a high-reliability serial communication interface designed for the Yokogawa STARDOM autonomous control platform. It provides a critical communication link between FCN/FCJ controllers and external industrial devices such as power meters, motor drives, and third-party PLC systems.

This module features two independent communication ports supporting both RS-422 and RS-485 physical layers. It enables flexible network architectures including point-to-point and multi-drop bus configurations.

Designed for distributed control environments, the NFLR121-S50 S1 supports asynchronous serial communication with selectable half-duplex or full-duplex modes. Its industrial-grade design ensures reliable operation in high electromagnetic interference environments commonly found in oil & gas, water treatment, and renewable energy facilities.

Technical Specifications

Application

The NFLR121-S50 S1 is commonly used in:

• Pipeline telemetry monitoring

• Wellhead control systems

• Remote terminal units (RTUs)

• Flow meter and smart sensor data aggregation

• SCADA system field integration

It allows STARDOM controllers to collect data from multiple serial devices over a single RS-485 network, reducing installation cost while maintaining high data integrity.

FAQ

Q1: What is the difference between NFLR121 and ALR121 modules?
The NFLR121-S50 S1 is designed specifically for the STARDOM FCN/FCJ controller series, while the ALR series is used in CENTUM VP / CS 3000 DCS architectures.

Q2: Can each port run different communication protocols?
Yes. Each port operates independently, allowing different device types, baud rates, or protocols to be configured simultaneously.

Q3: Does the module require external power?
No. The module receives 5V DC operating power directly from the STARDOM backplane bus.