{"product_id":"yokogawa-alr121-s50-rs-422-rs-485-dual-serial-communication-module","title":"Yokogawa ALR121-S50 RS-422\/RS-485 Dual Serial Communication Module","description":"\u003ch3\u003e\u003cstrong\u003eProduct Description\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ch3\u003e\u003cstrong\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eALR121-S50\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-performance\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSerial Communication Module\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edesigned for\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eYokogawa CENTUM VP\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eCENTUM CS 3000\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003esystems. It enables reliable asynchronous serial communication between the DCS and external industrial devices such as PLCs, analyzers, and monitoring instruments. The module is suitable for demanding process environments where data integrity and system uptime are critical.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDual-Port Design\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eEquipped with two isolated RS-422\/RS-485 ports supporting both point-to-point (RS-422) and multipoint (RS-485) connections.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePorts operate independently, allowing simultaneous communication with multiple devices or redundant network paths.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Speed Communication\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eSupports baud rates from\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1200 bps up to 115,200 bps\u003c\/strong\u003e, providing flexibility for varying device requirements.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCapable of long-distance communication up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1200 meters\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eper port for extended field installations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eProtocol Compatibility\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eNative\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eModbus RTU Master\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003esupport ensures seamless integration with third-party devices.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFlexible “no-protocol” configuration allows custom frame definitions for proprietary equipment.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eIndustrial Reliability\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eConformal Coating (S50 suffix)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprotects against moisture, corrosive gases, and harsh environmental conditions (G3 class per ISA-S71.04).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHot-swappable capability allows maintenance without powering down the system.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSeamless DCS Integration\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eFully mapped into Yokogawa Engineering Desktop, enabling direct use of external data as standard process tags.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDual redundancy support ensures uninterrupted operation in critical control loops.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNumber of Ports\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2 (RS-422\/RS-485)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommunication Speed\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1200 \/ 2400 \/ 4800 \/ 9600 \/ 19200 \/ 38400 \/ 57600 \/ 115200 bps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTransmission Distance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 1200 m per port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConnection Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTerminal block via AKB cables or pressure terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommunication Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHalf-duplex, asynchronous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSynchronization\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStart-stop method\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTransmission Code\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eASCII \/ Binary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent Consumption\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.5 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (H×W×D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.28 cm × 14.29 cm × 13 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 0.3 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEnvironmental Protection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard type with conformal coating (S50)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eApplications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIdeal for connecting external devices to CENTUM VP and CS 3000 systems in chemical, power, and petrochemical plants. Supports critical control and safety applications requiring reliable serial communication over long distances.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can ALR121-S50 handle multipoint RS-485 communication?\u003c\/strong\u003e\u003cbr\u003eA: Yes, it supports both point-to-point RS-422 and multipoint RS-485 connections.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can the module be replaced while the system is running?\u003c\/strong\u003e\u003cbr\u003eA: Yes, it is fully hot-swappable, minimizing downtime during maintenance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What environments is the S50 variant suited for?\u003c\/strong\u003e\u003cbr\u003eA: S50 indicates a standard type with conformal coating, suitable for corrosive gases and high-humidity conditions (ISA-S71.04 Class G3).\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":44127164891235,"sku":"ALR121-S50","price":180.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0549\/2775\/3315\/files\/YOKOGAWAALR121-S50.jpg?v=1776670544","url":"https:\/\/precisemodule.com\/products\/yokogawa-alr121-s50-rs-422-rs-485-dual-serial-communication-module","provider":"Precise Module Ltd.","version":"1.0","type":"link"}