{"product_id":"serial-communication-module-yokogawa-alr121-s00","title":"Serial Communication Module | Yokogawa ALR121-S00","description":"\u003ch2\u003eYokogawa ALR121-S00 Serial Communication Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for serial data exchange in Yokogawa CENTUM VP and CENTUM CS 3000 systems, the \u003cstrong\u003eYokogawa ALR121-S00\u003c\/strong\u003e (\u003cstrong\u003eALR121\u003c\/strong\u003e Serial Communication Module) provides direct electrical interfacing over RS-422\/RS-485 physical layers. It executes asynchronous start-stop data transfer for subsystem integration at defined baud rates.\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\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eYokogawa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eALR121-S00\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\u003e0.34 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 50 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e0.5 A max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Ports\u003c\/td\u003e\n\u003ctd\u003e2 independent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface Standard\u003c\/td\u003e\n\u003ctd\u003eRS-422 \/ RS-485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Code\u003c\/td\u003e\n\u003ctd\u003eBinary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSynchronization\u003c\/td\u003e\n\u003ctd\u003eAsynchronous (start-stop)\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\u003eMax Cable Length\u003c\/td\u003e\n\u003ctd\u003e1200 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Bus Integration and Channel Isolation\u003c\/h3\u003e\n\u003cp\u003eThe ALR121-S00 supports channel-to-channel isolation to prevent ground loop formation between subsystems. Integration occurs through deterministic backplane bus transactions within the Field Control Station (FCS). Electrical isolation is maintained between each serial port and the DCS backplane to suppress transient propagation from connected field devices.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the ALR121-S00 support hot-swapping?\u003c\/p\u003e\n\u003cp\u003eA: Yes. The module can be replaced online in a powered FCS node without interrupting system operation, provided redundancy is configured.\u003c\/p\u003e\n\u003cp\u003eQ: What is the maximum number of devices per RS-485 port?\u003c\/p\u003e\n\u003cp\u003eA: Each port supports up to 31 devices in multi-drop configuration under RS-485 signaling constraints.\u003c\/p\u003e\n\u003cp\u003eQ: Can both ports operate at different baud rates?\u003c\/p\u003e\n\u003cp\u003eA: Yes. Each port can be independently configured for speed, parity, and protocol settings.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the module in designated FCS I\/O slots only. Use shielded twisted-pair cable for all serial connections. Terminate shield grounds at the DCS side using approved grounding bars; do not connect shields at device ends to avoid ground loops. Observe maximum cable length limits to maintain signal integrity. For redundant configurations, ensure both modules share identical firmware revisions before commissioning.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":44209087021144,"sku":"ALR121-S00","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/2039\/0488\/files\/ALR121-S00-3.jpg?v=1780976040","url":"https:\/\/www.industriaxplc.com\/products\/serial-communication-module-yokogawa-alr121-s00","provider":"IndustriaX Limited","version":"1.0","type":"link"}