{"product_id":"yokogawa-rs81-b-interface-module-card","title":"Yokogawa RS81*B Interface Module Card","description":"\u003cp\u003eThe \u003cstrong\u003eYokogawa RS81*B\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eRS81\u003c\/strong\u003e Interface Module Card, operates as a dedicated hardware component for serial RS-232C data communication within Yokogawa CENTUM VP control system racks. The module establishes point-to-point asynchronous physical data links between central processor units and third-party subsystems. Onboard surface-mount technology (SMT) circuitry executes signal formatting, parity checking, and buffer management across the backplane bus interface to maintain deterministic transaction timing.\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\u003eRS81*B\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\u003e0.8 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e25 mm x 254 mm x 381 mm (1.0 in x 10.0 in x 15.0 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eBackplane bus powered (5 VDC \/ 24 VDC rail)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Interface\u003c\/td\u003e\n\u003ctd\u003eRS-232C serial port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAssembly Technology\u003c\/td\u003e\n\u003ctd\u003eHigh-precision surface-mount technology (SMT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Compatibility\u003c\/td\u003e\n\u003ctd\u003eYokogawa CENTUM VP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eSerial Interface Architecture and Galvanic Isolation\u003c\/h3\u003e\n\u003cp\u003eThe RS81*B module coordinates RS-232C serial telemetry transfers while decoupling field communication paths from internal backplane logic rails. Galvanic channel-to-channel isolation protects signal drivers from common-mode electrical noise and ground loops when interfacing with external controllers or smart instrumentation executing 4-20 mA HART loop protocol conversion routines. Onboard buffer circuits handle asynchronous frame transmission to prevent packet collisions during cyclic DCS processor updates.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What physical communication protocol is supported by the RS81*B interface card?\u003c\/p\u003e\n\u003cp\u003eA: The module incorporates an RS-232C serial interface driver designed for direct point-to-point asynchronous communication with external devices.\u003c\/p\u003e\n\u003cp\u003eQ: Can the RS81*B module be extracted or replaced while the host rack is energized?\u003c\/p\u003e\n\u003cp\u003eA: Module removal requires isolating the serial interface loop; online replacement is permitted only when supported by the specific CENTUM VP subrack backplane redundancy configuration.\u003c\/p\u003e\n\u003cp\u003eQ: How does the card protect backplane circuits against serial line surges?\u003c\/p\u003e\n\u003cp\u003eA: Integrated galvanic isolation barriers isolate the RS-232C signal pins from the internal system bus, suppressing voltage spikes and high-frequency noise from field wiring.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Alignment:\u003c\/strong\u003e Align the RS81*B card edges with the subrack guide slots inside the CENTUM VP cabinet. Push the module smoothly until the rear backplane connectors fully lock into the motherboard.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetaining Screw Fastening:\u003c\/strong\u003e Tighten upper and lower retaining screws on the front panel to lock the assembly in place and ensure frame ground contact.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable Shield Termination:\u003c\/strong\u003e Connect RS-232C serial cable shields to the cabinet functional earth (FE) ground bus at a single termination point to prevent noise coupling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Constraints:\u003c\/strong\u003e Maintain adequate ventilation above and below the card slot array to allow natural convection, keeping cabinet operating temperatures within 0 to 60 deg C.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":53281920385333,"sku":"RS81*B","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/RS81B.png?v=1786692261","url":"https:\/\/www.5gplc.com\/products\/yokogawa-rs81-b-interface-module-card","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}