{"product_id":"serial-communication-module-yokogawa-alr121-se1","title":"Serial Communication Module | Yokogawa ALR121-SE1","description":"\u003ch2\u003eYokogawa ALR121-SE1 Serial Communication Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eYokogawa ALR121-SE1\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eALR121\u003c\/strong\u003e Serial Communication Module, operates as a dedicated hardware component for RS-422\/RS-485 data exchange within Yokogawa FCS and distributed I\/O networks.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\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\u003ctd\u003eModelBrand\u003c\/td\u003e\n\u003ctd\u003eYokogawa ALR121-SE1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.30 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e100 x 160 x 30 mm (3.94 x 6.30 x 1.18 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperatingTemp\u003c\/td\u003e\n\u003ctd\u003e-20 to +60 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorageTemp\u003c\/td\u003e\n\u003ctd\u003e-40 to +80 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHumidityRange\u003c\/td\u003e\n\u003ctd\u003e10 to 95% RH, non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePowerConsumption\u003c\/td\u003e\n\u003ctd\u003e0.5 A max @ 5 V DC backplane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface\u003c\/td\u003e\n\u003ctd\u003eRS-422 \/ RS-485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePorts\u003c\/td\u003e\n\u003ctd\u003e2 independent ports\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnectionMethod\u003c\/td\u003e\n\u003ctd\u003eRS-422: Point-to-point, RS-485: Multi-point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunicationMode\u003c\/td\u003e\n\u003ctd\u003eHalf-duplex, start-stop synchronization\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmissionCode\u003c\/td\u003e\n\u003ctd\u003eASCII \/ Binary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBaudRates\u003c\/td\u003e\n\u003ctd\u003e1200 \/ 2400 \/ 4800 \/ 9600 \/ 19200 \/ 38400 bps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharacterLength\u003c\/td\u003e\n\u003ctd\u003e7 or 8 bits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStopBits\u003c\/td\u003e\n\u003ctd\u003e1 or 2 bits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParity\u003c\/td\u003e\n\u003ctd\u003eNone, Even, Odd\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaxTransmissionDistance\u003c\/td\u003e\n\u003ctd\u003e1200 meters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/ODataCapacity\u003c\/td\u003e\n\u003ctd\u003e1000 words per module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunicationDefinitions\u003c\/td\u003e\n\u003ctd\u003eMax 128 per module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003e\u003cstrong\u003eProcess Contro lSystem Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe ALR121-SE1 incorporates \u003cstrong\u003echannel-to-channel isolation\u003c\/strong\u003e to prevent cross-interference between RS-422 and RS-485 ports. The module supports standard \u003cstrong\u003e4-20 mA HART loop protocols\u003c\/strong\u003e for connected devices and maintains \u003cstrong\u003ecold junction compensation (CJc)\u003c\/strong\u003e for precise signal integrity under variable thermal conditions. Redundant configurations are supported for critical communication protocols such as Modbus RTU\/ASCII and FA-M3, enabling uninterrupted data flow in dual-module setups.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eQ: Does the ALR121-SE1 support hot-swap replacement within FCS nodes?\u003cbr\u003eA: Yes, the module can be replaced without powering down the node, provided the backplane bus load does not exceed rated limits.\u003c\/p\u003e\n\u003cp\u003eQ: What is the maximum distance for reliable RS-485 communication?\u003cbr\u003eA: RS-485 communication is supported up to 1200 meters with standard twisted-pair cabling.\u003c\/p\u003e\n\u003cp\u003eQ: Are firmware updates required for connecting to different subsystem protocols?\u003cbr\u003eA: No firmware update is needed; protocol selection is configured via the module I\/O settings and network parameters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eField Installation Guidelines\u003c\/strong\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eMount the module securely within the FCS node or designated I\/O chassis.\u003c\/li\u003e\n\u003cli\u003eEnsure RS-422\/RS-485 twisted-pair cables are shielded and properly grounded at a single point.\u003c\/li\u003e\n\u003cli\u003eAvoid routing signal lines near high-voltage or high-frequency devices to reduce noise pickup.\u003c\/li\u003e\n\u003cli\u003eTerminate unused ports according to RS-422\/RS-485 standard to maintain signal integrity.\u003c\/li\u003e\n\u003cli\u003eVerify dual-port protocol settings before commissioning to avoid communication conflicts.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":44163784114264,"sku":"ALR121-SE1","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/2039\/0488\/files\/ALR121-SE1-3.jpg?v=1780302691","url":"https:\/\/www.industriaxplc.com\/products\/serial-communication-module-yokogawa-alr121-se1","provider":"IndustriaX Limited","version":"1.0","type":"link"}