{"product_id":"alr121-se1-s1-rs-422-rs-485-yokogawa-serial-communication-module","title":"ALR121-SE1-S1 RS-422\/RS-485 Yokogawa Serial Communication Module","description":"\u003ch2\u003eYOKOGAWA ALR121-SE1-S1 Serial Communication Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eYOKOGAWA ALR121-SE1-S1\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eALR121\u003c\/strong\u003e RS-422\/RS-485 module, operates as a dedicated hardware component for serial data exchange between Field Control Stations (FCS) or Safety Control Stations (SCS) and external subsystems within DCS 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\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-SE1-S1\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\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\u003e7.7 cm x 4.2 cm x 10.6 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003eStandard DCS environment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e0.5 A\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\u003eTransmission Speed\u003c\/td\u003e\n\u003ctd\u003e1200 to 38400 bps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Distance\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 Control and Communication Connectivity\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eALR121-SE1-S1\u003c\/strong\u003e module executes data transmission via half-duplex, start-stop synchronization for seamless integration with third-party PLCs and intelligent field instruments. It provides critical channel-to-channel isolation to protect the internal DCS backplane from external electrical surges common in multi-point RS-485 serial networks. By supporting configurable parity, character length, and stop-bit settings, the module enables precise protocol matching for Modbus RTU or proprietary serial subsystems. Effective signal integrity is maintained through the use of shielded, multi-pair cabling, which minimizes latency and electromagnetic interference during long-distance transmission.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can this module be hot-swapped while the FCS\/SCS is operational?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the ALR121 series supports online module replacement, provided the specific system rack and firmware version allow for hardware hot-swapping. Ensure the associated port is software-disabled before physical removal to prevent bus communication errors.\u003c\/p\u003e\n\u003cp\u003eQ: What is the maximum transmission distance for an RS-485 configuration?\u003c\/p\u003e\n\u003cp\u003eA: The module supports a maximum transmission distance of up to 1200 meters. Performance is dependent on the baud rate, cable capacitance, and the proper termination of the RS-485 bus at both physical ends.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting\u003c\/strong\u003e: Install the module into the designated slot on the AFV30\/40, A2FV50\/70, or ANB10\/11 rack. Ensure the locking tabs are fully engaged to guarantee a solid connection to the backplane bus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring\u003c\/strong\u003e: Use AKB161 or AKB162 shielded 3-pair cables. Connect field wires to the 5-pole terminal block using M4 screws. Tighten to industry-standard torque to prevent vibration-induced loosening.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShielding\u003c\/strong\u003e: Ground the cable shield at the designated terminal point. Avoid routing serial communication cables in parallel with high-voltage AC power lines to mitigate noise interference.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration\u003c\/strong\u003e: Verify communication parameters (baud rate, parity, data bits) in the system configuration software before initiating data exchange.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43585678475354,"sku":"ALR121-SE1","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/446._e710e14b-f661-49a0-a16f-cf6bb01edc23.jpg?v=1783060406","url":"https:\/\/www.spareoil.com\/products\/alr121-se1-s1-rs-422-rs-485-yokogawa-serial-communication-module","provider":"SpareOil Automation","version":"1.0","type":"link"}