{"product_id":"communication-module-yokogawa-alr121-s50-rs-422-rs-485-serial","title":"Communication Module | Yokogawa ALR121-S50 RS-422\/RS-485 Serial","description":"\u003ch2\u003eYokogawa ALR121-S50 Serial Communication Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for RS-422\/RS-485 serial interface execution in CENTUM VP control networks, the \u003cstrong\u003eYokogawa ALR121-S50\u003c\/strong\u003e (\u003cstrong\u003eALR121\u003c\/strong\u003e Serial Communication Module) provides direct physical\/electrical execution.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eCode\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eOption \/ Specification\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eALR121\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBase Model\u003c\/td\u003e\n\u003ctd\u003eSerial Communication Module (2-Port RS-422\/RS-485)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e-S\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eStandard Type\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e5\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEnvironmental Protection\u003c\/td\u003e\n\u003ctd\u003eStandard Environment (No Explosion Protection)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e0\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eConfiguration\u003c\/td\u003e\n\u003ctd\u003eBasic Module Type\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eALR121-S50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eYokogawa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eSingapore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.30 kg (Net, 0.66 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e3.28 cm x 14.29 cm x 13.00 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to +60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e0.50 A @ 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface Ports\u003c\/td\u003e\n\u003ctd\u003e2 Ports (RS-422 \/ RS-485)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Mode\u003c\/td\u003e\n\u003ctd\u003eHalf-duplex\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBaud Rates\u003c\/td\u003e\n\u003ctd\u003e1200 \/ 2400 \/ 4800 \/ 9600 \/ 19200 \/ 38400 bps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSynchronization\u003c\/td\u003e\n\u003ctd\u003eStart-stop asynchronous method\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Code\u003c\/td\u003e\n\u003ctd\u003eASCII \/ Binary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNetwork Topology\u003c\/td\u003e\n\u003ctd\u003ePoint-to-point (RS-422), Multipoint (RS-485)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eIndustrial Communication and Protocol Processing\u003c\/h3\u003e\n\u003cp\u003eThe ALR121-S50 module establishes serial data exchanges between field-mounted instrumentation and central processing units across Yokogawa CENTUM architectures. The hardware routes ASCII or binary code blocks using half-duplex start-stop synchronization over dual RS-422 or RS-485 physical lines. Integrated serial controllers support standard 4-20 mA HART loop protocol pass-through and subsystem fieldbus links, maintaining signal integrity and channel-to-channel isolation to block common-mode voltage spikes from entering the main backplane bus.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the ALR121-S50 differ from the legacy ALR121-S00 model?\u003c\/p\u003e\n\u003cp\u003eA: The ALR121-S50 serves as the direct functional replacement for the ALR121-S00, updated to comply with current manufacturing standards while retaining matching pin assignments and electrical performance.\u003c\/p\u003e\n\u003cp\u003eQ: What line termination resistance is required for RS-485 multipoint wiring on this module?\u003c\/p\u003e\n\u003cp\u003eA: Match line termination resistance (typically 120 ohms) across both physical endpoints of the RS-485 bus to mitigate signal reflection along long cable paths.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eAlign the ALR121-S50 module vertically with the designated I\/O node slot on the rack backplane, sliding it inward until the card-edge connectors seat completely. Tighten the top and bottom captive screws to lock the physical assembly and verify structural ground contact. Terminate signal conductors using shielded twisted-pair cables, bonding cable drain shields to a dedicated terminal ground bar inside the cabinet to limit electromagnetic interference and electrical noise on serial lines.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43838759338074,"sku":"ALR121 -S51","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/21._f9e080a4-876d-42ad-87a9-85b9c63a2c3a.jpg?v=1786601575","url":"https:\/\/www.spareoil.com\/products\/communication-module-yokogawa-alr121-s50-rs-422-rs-485-serial","provider":"SpareOil Automation","version":"1.0","type":"link"}