{"product_id":"yokogawa-alr121-s53-s1-centum-vp-rs-422-rs-485-module","title":"Yokogawa ALR121-S53 S1 CENTUM VP RS-422\/RS-485 Module","description":"\u003ch2\u003eYokogawa ALR121-S53 S1 RS-422\/RS-485 Communication Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eYokogawa ALR121-S53 S1\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eALR121\u003c\/strong\u003e Serial Communication Module, operates as a dedicated hardware component for serial subsystem data exchange within CENTUM VP and ProSafe-RS control networks.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eModel \/ Suffix Code\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\u003e\u003cstrong\u003eALR121\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSerial Communication Module (2-channel, RS-422\/RS-485)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e-S5\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard type with basic functions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWith diagnostic functions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eS1\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHardware style code revision 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\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-S53 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\u003e30 mm (W) x 100 mm (H) x 80 mm (D)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to +75 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e0.5 A at 5 VDC (backplane bus power)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface Ports\u003c\/td\u003e\n\u003ctd\u003e2 ports (RS-422 point-to-point \/ RS-485 multipoint)\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 Cable Length\u003c\/td\u003e\n\u003ctd\u003e1200 m (RS-485) \/ 15 m (RS-422)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Code\u003c\/td\u003e\n\u003ctd\u003eASCII \/ Binary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrame Synchronization\u003c\/td\u003e\n\u003ctd\u003eStart-stop asynchronous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Barrier\u003c\/td\u003e\n\u003ctd\u003ePhotocoupler isolation between field and backplane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Mounting\u003c\/td\u003e\n\u003ctd\u003eAFV30, AFV40, ANB10, ANB11 base units\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eChannel-to-Channel Isolation \u0026amp; Signal Integrity\u003c\/h3\u003e\n\u003cp\u003eThe Yokogawa ALR121-S53 S1 incorporates photocoupler electrical isolation to decouple external field serial loops from backplane logic communication paths. Supporting Modbus slave protocols alongside customized subsystem driver configurations, the module executes half-duplex asynchronous data transfer across both independent ports. Hardware transmission buffers and dedicated signal processing circuits absorb transient common-mode voltage shifts, preventing field-side noise from interfering with controller backplane data cycles over long 1200 m RS-485 lines.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How are communication parameters like baud rate and parity configured on the ALR121-S53 S1?\u003c\/p\u003e\n\u003cp\u003eA: Engineers configure transmission rates (up to 38400 bps), parity (None\/Even\/Odd), and stop bit parameters directly in the CENTUM VP software system builder, which downloads parameters to the module during initialization.\u003c\/p\u003e\n\u003cp\u003eQ: Can Port 1 and Port 2 operate with different physical interfaces simultaneously?\u003c\/p\u003e\n\u003cp\u003eA: Yes, each port supports independent configuration, allowing one port to run RS-422 point-to-point connections while the second port runs an RS-485 multipoint network.\u003c\/p\u003e\n\u003cp\u003eQ: What cables connect field devices to the module front interface?\u003c\/p\u003e\n\u003cp\u003eA: Standard Yokogawa shielded communication cables (such as the AKB131, AKB132, AKB133, and AKB134 cable assemblies) interface directly with the module's terminal blocks or connectors.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eTechnicians should follow standard cabinet assembly procedures during field integration:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eInsert the module into a compatible slot on an ANB10 or ANB11 node unit after verifying backplane power keying.\u003c\/li\u003e\n\u003cli\u003eTerminate the RS-485 network ends using appropriate line termination resistors to eliminate signal reflection over extended cable runs.\u003c\/li\u003e\n\u003cli\u003eRoute serial cables inside dedicated low-voltage instrument raceways, maintaining separation from high-voltage AC conductors and drive lines.\u003c\/li\u003e\n\u003cli\u003eAttach cable shields to the cabinet ground bar using dedicated grounding clamps to preserve noise immunity across the transmission loop.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43901441835098,"sku":"ALR121-S53 S1","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/67._d1fba29d-944e-4dc5-82c7-a14378907bb9.jpg?v=1787621561","url":"https:\/\/www.spareoil.com\/products\/yokogawa-alr121-s53-s1-centum-vp-rs-422-rs-485-module","provider":"SpareOil Automation","version":"1.0","type":"link"}