{"product_id":"yokogawa-alr111-s51-serial-communication-module","title":"Yokogawa ALR111-S51 Serial Communication Module","description":"\u003cp\u003eConfigured for serial data integration in N-IO\/FIO platforms, the \u003cstrong\u003eYokogawa ALR111-S51\u003c\/strong\u003e (\u003cstrong\u003eALR111\u003c\/strong\u003e Serial Communication Module) provides direct physical\/electrical execution of RS-232C communication protocols and network traffic management between field devices and the system bus.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eALR111:\u003c\/strong\u003e Base model identifier for the 2-port Serial Communication Module.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e-S:\u003c\/strong\u003e Standard type configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5:\u003c\/strong\u003e No explosion protection rating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1:\u003c\/strong\u003e Compliance with ISA Standard G3 for corrosive environments.\u003c\/li\u003e\n\u003c\/ul\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\u003eALR111-S51\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\u003eSubject to specific batch manufacturing data\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e2.0 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard N-IO\/FIO module form factor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003eIndustrial grade (0 deg C to 50 deg C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eSystem bus powered\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication\u003c\/td\u003e\n\u003ctd\u003e2-port RS-232C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eYokogawa DCS Process Control Characteristics\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChannel-to-Channel Isolation:\u003c\/strong\u003e The module features galvanic isolation between the two RS-232C ports and the internal system backplane, preventing potential ground loops and signal interference when communicating with multiple discrete field devices.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-20 mA HART Loop Protocol:\u003c\/strong\u003e While the module primary function is serial communication, the architecture supports data throughput for systems utilizing HART-to-RS-232 gateways, ensuring consistent diagnostic data delivery to the Centum VP supervisory level.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCold Junction Compensation (CJC):\u003c\/strong\u003e The module assembly utilizes low-drift components that minimize thermal sensitivity, preserving signal integrity when installed in high-density instrumentation cabinets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Integration:\u003c\/strong\u003e The module utilizes a deterministic communication controller to manage serial frame processing, ensuring that asynchronous data from connected field sensors remains aligned with the system bus scan cycles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the ALR111-S51 support RS-485 conversion?\u003c\/p\u003e\n\u003cp\u003eA: No, this specific model is hardwired for RS-232C communication. Conversion to RS-485 or other standards would require an external industrial signal converter.\u003c\/p\u003e\n\u003cp\u003eQ: Is this module compatible with hot-swapping under normal operational conditions?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the module supports hot-swapping within the N-IO\/FIO node chassis. Ensure that the associated software configuration is correctly mapped to the new module address before system activation.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Seat the module into the designated slot on the N-IO\/FIO node. Tighten the top and bottom retaining screws to establish a secure electrical bond with the node chassis for EMI protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring:\u003c\/strong\u003e Use shielded RS-232C serial cables with lengths not exceeding standard EIA\/TIA specifications to maintain signal quality. Terminate cable shields at the designated ground terminals to prevent noise pickup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental:\u003c\/strong\u003e While the module is ISA G3 rated for corrosion resistance, maintain the control cabinet environment within the specified temperature range to ensure component longevity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagnostics:\u003c\/strong\u003e Upon installation, monitor the front-panel status LEDs. An active communication link will be indicated by the flashing TX\/RX LEDs, confirming proper handshake and data flow with the field device.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":45265360126067,"sku":"ALR111-S51","price":233.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/screenshot_2026-07-10_17-00-44_82049378-8bae-4423-8296-37cf23fc2096.png?v=1784541876","url":"https:\/\/www.dcssupplier.com\/products\/yokogawa-alr111-s51-serial-communication-module","provider":"DcsSupplier Limited","version":"1.0","type":"link"}