{"product_id":"acm22-rs-422-rs-485-communication-module-yokogawa","title":"ACM22 RS-422\/RS-485  | Communication Module | Yokogawa","description":"\u003ch2\u003eYokogawa ACM22 RS-422\/RS-485 Communication Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eYokogawa ACM22\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eACM22\u003c\/strong\u003e Communication Module, operates as a dedicated hardware component for serial data interfacing between Field Control Stations and peripheral devices within CENTUM CS 1000 \/ CS 3000 platforms.\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\u003eModelBrand\u003c\/td\u003e\n\u003ctd\u003eACM22\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\u003e0.50 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eNest-mount, 1 slot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperatingTemp\u003c\/td\u003e\n\u003ctd\u003e0 to 55 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePowerConsumption\u003c\/td\u003e\n\u003ctd\u003eMax. 1.2 A at 5.0 VDC (backplane supplied)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Ports\u003c\/td\u003e\n\u003ctd\u003e2 (independent, RS-422\/RS-485 selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Mode\u003c\/td\u003e\n\u003ctd\u003eHalf-Duplex, 2-wire or 4-wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Baud Rates\u003c\/td\u003e\n\u003ctd\u003e1200 \/ 2400 \/ 4800 \/ 9600 \/ 19200 \/ 38400 bps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Transmission Distance\u003c\/td\u003e\n\u003ctd\u003eUp to 1,200 m per port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Connected Nodes\u003c\/td\u003e\n\u003ctd\u003e31 slave devices per port (RS-485 mode)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Media\u003c\/td\u003e\n\u003ctd\u003eShielded Twisted Pair (STP) cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e500 V AC between comm circuit and internal logic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection Interface\u003c\/td\u003e\n\u003ctd\u003eTerminal block or D-sub connector (per nest plate suffix)\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\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003e\u003cstrong\u003eDCS Integration Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe ACM22 provides \u003cstrong\u003echannel-to-channel isolation\u003c\/strong\u003e to prevent interference between serial lines. It supports 4-20 mA HART loop protocol integration when connected to analog I\/O subsystems. Cold junction compensation (CJc) circuitry ensures minimal thermal-induced offset when communicating with temperature-sensitive instruments.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eQ: Can the ACM22 be hot-swapped while the FCS is powered?\u003cbr\u003eA: No. The module must be inserted or removed only with the nest power off to prevent backplane current spikes.\u003c\/p\u003e\n\u003cp\u003eQ: What is the effect of connecting more than 31 devices on an RS-485 port?\u003cbr\u003eA: Exceeding 31 nodes can result in bus reflections, communication errors, or reduced signal integrity.\u003c\/p\u003e\n\u003cp\u003eQ: Are firmware updates required for compatibility with newer CENTUM CS 3000 revisions?\u003cbr\u003eA: The ACM22 is firmware-independent; compatibility relies on nest and FCS backplane versions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eField Installation Guidelines\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInstall in a properly grounded nest slot; avoid shared ground loops with high-current devices.\u003c\/li\u003e\n\u003cli\u003eUse shielded twisted-pair cables; terminate shields at one end only to prevent circulating currents.\u003c\/li\u003e\n\u003cli\u003eSet DIP switches or jumpers for RS-422 or RS-485 mode and termination resistor value (100 or 120 ohms).\u003c\/li\u003e\n\u003cli\u003eMaintain minimum separation from high-frequency switching devices to reduce EMI.\u003c\/li\u003e\n\u003cli\u003eVerify LED status indicators (Ready, Run, Tx\/Rx) after installation for proper line operation.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":44208956866648,"sku":"ACM22RS-422\/485","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/2039\/0488\/files\/ACM22RS-422485.jpg?v=1780967988","url":"https:\/\/www.industriaxplc.com\/products\/acm22-rs-422-rs-485-communication-module-yokogawa","provider":"IndustriaX Limited","version":"1.0","type":"link"}