{"product_id":"alr121-s53-yokogawa-alr121-serial-communication-modules","title":"ALR121-S53 | Yokogawa | ALR121 Serial Communication Modules","description":"\u003ch2\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eYokogawa ALR121‑S53\u003c\/strong\u003e is a dual‑port serial communication module designed for CENTUM VP and ProSafe‑RS systems. It supports RS‑422\/RS‑485 interfaces and provides Modbus slave and subsystem communication functions for stable industrial data exchange.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eHardware Specifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003eALR121‑S53\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eYokogawa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOrigin\u003c\/th\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eApprox. 0.34 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShipping Weight\u003c\/th\u003e\n\u003ctd\u003e1.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003eStandard Yokogawa I\/O module form factor; no numeric value specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temp\u003c\/th\u003e\n\u003ctd\u003eISA G3 temperature rating (–20 to +70 °C, maintenance purpose only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower Consumption\u003c\/th\u003e\n\u003ctd\u003eCurrent consumption 0.5 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eModule Type\u003c\/th\u003e\n\u003ctd\u003eSerial Communication Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInterface\u003c\/th\u003e\n\u003ctd\u003eRS‑422 \/ RS‑485 (4‑wire system)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePorts\u003c\/th\u003e\n\u003ctd\u003e2 serial communication ports\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCommunication Functions\u003c\/th\u003e\n\u003ctd\u003eModbus slave communication; subsystem communication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExplosion Protection\u003c\/th\u003e\n\u003ctd\u003eCode “5” – no explosion protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSuffix Code\u003c\/th\u003e\n\u003ctd\u003eS53 (Standard type, no explosion protection, ISA G3 rating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMounting\u003c\/th\u003e\n\u003ctd\u003eRack‑mounted within CENTUM VP \/ ProSafe‑RS I\/O nests\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePCB Coating\u003c\/th\u003e\n\u003ctd\u003eConformal coating (model‑dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eSerial Communication Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch2\u003e\u003cstrong\u003eFunctional Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe ALR121‑S53 module provides two isolated serial communication ports supporting RS‑422\/RS‑485 4‑wire operation. It enables Modbus slave communication and subsystem data exchange within Yokogawa control architectures. As part of the ALR121 family, the S53 suffix indicates a \u003cstrong\u003estandard‑type module\u003c\/strong\u003e with \u003cstrong\u003eno explosion protection\u003c\/strong\u003e and \u003cstrong\u003eISA G3 environmental compliance\u003c\/strong\u003e. The module routes serial data to the control processor through the backplane, ensuring deterministic communication timing for subsystem integration.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What communication protocols does ALR121‑S53 support?\u003c\/strong\u003e It supports Modbus slave communication and Yokogawa subsystem communication functions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What does the S53 suffix mean?\u003c\/strong\u003e “S” = Standard type “5” = No explosion protection “3” = ISA G3 environmental rating (–20 to +70 °C for maintenance)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can ALR121‑S53 be hot‑swapped?\u003c\/strong\u003e No. Serial communication modules must be inserted or removed only when the I\/O segment is de‑energized.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eField Installation Guidelines\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMaintain shield continuity on serial communication wiring to reduce noise.\u003c\/li\u003e\n\u003cli\u003eEnsure correct polarity and wiring for RS‑422\/RS‑485 4‑wire connections.\u003c\/li\u003e\n\u003cli\u003eAvoid routing serial lines near high‑current conductors to prevent interference.\u003c\/li\u003e\n\u003cli\u003eVerify backplane connectors are fully seated before energizing the system.\u003c\/li\u003e\n\u003cli\u003eInspect terminal surfaces for contamination or oxidation prior to installation.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":47904320159934,"sku":"ALR121-S53","price":3000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/screenshot_2026-06-11_15-20-15_4e883ad2-8c8c-42ca-aebd-ad691804f78f.png?v=1781164473","url":"https:\/\/www.autooiltech.com\/products\/alr121-s53-yokogawa-alr121-serial-communication-modules","provider":"AutoOilTech Limited","version":"1.0","type":"link"}