{"product_id":"yokogawa-nflr121-s50-serial-communication-module-rs-422-rs-485-2-port","title":"Yokogawa NFLR121-S50 Serial Communication Module RS-422\/RS-485 2-Port","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe Yokogawa NFLR121-S50 operates as a high-reliability serial communication interface for the STARDOM Field Control Node (FCN) system. Equipped with two independent RS-422\/RS-485 ports, this module enables seamless integration between the primary controller and a vast array of subsystem devices, including power meters, motor drives, and specialized analytical instruments. It excels in large-scale industrial deployments where long-distance data acquisition—up to 1,200 meters—is mandatory for maintaining operational oversight. By supporting both half-duplex and full-duplex modes, the NFLR121-S50 ensures flexible topology configurations for multipoint communication networks. This module stabilizes the data flow across the plant floor, protecting the integrity of control signals from electromagnetic interference and ensuring that critical process variables reach the CPU with absolute precision.\u003c\/p\u003e\n\u003ch2\u003eTechnical Configuration\u003c\/h2\u003e\n\u003cp\u003eThe NFLR121-S50 follows the standard Yokogawa coding structure, which defines the communication protocol and hardware safety ratings.\u003c\/p\u003e\n\u003ch3\u003eModel Suffix Analysis\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eNFLR121:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBasic Model Code for the RS-422\/RS-485 Serial Communication Module designed for the FCN architecture.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e-S:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDesignates the Standard Type module. This indicates the unit supports universal asynchronous communication protocols used across most industrial serial devices.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e5:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIdentifies the protection level. This \"Basic\" code confirms the module is intended for installation in non-hazardous areas where no specialized explosion protection (Ex) is required.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e0:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eRepresents the \"Basic Type\" configuration without specialized functional additions, ensuring straightforward plug-and-play compatibility with standard FCN base units.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eYokogawa\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel Number\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eNFLR121-S50\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInterface\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRS-422 \/ RS-485 (2 Ports)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCommunication Speed\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.3 to 115.2 kbps\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eTransmission Distance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eMax. 1200 meters (Total extended length)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eConnection Method\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eClamped terminal block (M4 screws, 5 poles x 2)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eDimensions (W x H x D)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e33.1 mm x 130 mm x 123.5 mm\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e0.3 kg\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCurrent Consumption\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e500 mA (at 5V DC)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSynchronization\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eStart-stop (Asynchronous)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMode\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eHalf-duplex or Full-duplex\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003cp\u003eProper physical termination and electrical grounding are essential for high-speed serial reliability over long distances.\u003c\/p\u003e\n\u003ch3\u003eWiring and Termination\u003c\/h3\u003e\n\u003cp\u003eConnect field devices using the M4 clamped terminal blocks. When operating in RS-485 multipoint mode, ensure you install a termination resistor (typically 120 ohms) at the farthest physical end of the cable run to prevent signal reflection. Maintain tight connections on the terminal block to avoid intermittent communication errors caused by vibration.\u003c\/p\u003e\n\u003ch3\u003eCable Selection and Grounding\u003c\/h3\u003e\n\u003cp\u003eUse shielded twisted pair (STP) cabling for all RS-422\/485 runs. Connect the cable shield to the functional ground (FG) at a single point only—usually at the NFLR121-S50 module end—to prevent ground loops. Ensure the total cable length does not exceed 1,200 meters to stay within the electrical signal timing requirements of the RS-485 standard.\u003c\/p\u003e\n\u003ch3\u003ePort Configuration\u003c\/h3\u003e\n\u003cp\u003eThe module supports full-duplex (4-wire) and half-duplex (2-wire) configurations via software settings. Verify that your field device wiring matches the software-selected mode; an incorrect mode selection will lead to transmit\/receive collisions and data timeouts.\u003c\/p\u003e\n\u003ch2\u003eEngineering Advantages\u003c\/h2\u003e\n\u003cp\u003eThe NFLR121-S50 provides a ruggedized communication layer that shields the FCN controller from the electrical noise generated by industrial heavy machinery. Its dual-port design allows for redundant wiring paths or the separation of two distinct device networks on a single module, effectively doubling the I\/O density. The use of M4 screw terminals ensures a \"gas-tight\" connection that resists the oxidation and loosening common in corrosive chemical environments. Furthermore, its high-speed baud rate capability (up to 115.2 kbps) minimizes communication latency, making it suitable for real-time monitoring of power systems where fast response times are critical.\u003c\/p\u003e\n\u003ch2\u003eShipping and Delivery\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDelivery Time:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e3-5 business days upon payment finish.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCarrier Options:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWorldwide shipping by DHL, FEDEX, or UPS.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Status:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBrand New, Original Factory Sealed Pack, Large Stock Available.\u003c\/p\u003e\n\u003ch2\u003eTechnical FAQs\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ1: Can Port 1 be used for RS-422 while Port 2 is used for RS-485?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA1: Yes. The NFLR121-S50 features two independent ports. You can configure each port with different communication parameters and electrical standards (RS-422 or RS-485) within the STARDOM configuration software.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ2: Does this module support the Modbus RTU protocol?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA2: Yes. When paired with the appropriate software licenses on the FCN CPU, the NFLR121-S50 serves as the physical layer for Modbus RTU Master or Slave communications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ3: Is it possible to hot-swap the NFLR121-S50?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA3: The FCN hardware supports online module replacement; however, you must ensure that the communication tasks are properly managed in the logic to prevent system alarms during the brief disconnection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ4: What is the maximum number of devices I can connect to a single RS-485 port?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA4: While the RS-485 standard technically supports 32 unit loads, the actual number depends on the receiver impedance of your field devices. For optimal performance over 1,000+ meters, we recommend keeping the device count per port within manageable limits or using RS-485 repeaters.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":45907087818925,"sku":"NFLR121-S50","price":1699.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/yokogawa_nflr121-s50_1.jpg?v=1776133172","url":"https:\/\/www.maxwellplc.com\/products\/yokogawa-nflr121-s50-serial-communication-module-rs-422-rs-485-2-port","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}