{"product_id":"honeywell-2mll-c42a-2-channel-rs-422-serial-communication-module","title":"Honeywell 2MLL-C42A 2-Channel RS-422 Serial Communication Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eHoneywell 2MLL-C42A\u003c\/strong\u003e is a \u003cstrong\u003e2-channel RS-422 serial communication module\u003c\/strong\u003e for the \u003cstrong\u003eMasterLogic-200 (ML200)\u003c\/strong\u003e PLC system. It enables high-speed, noise-immune serial data exchange between the ML200 CPU and third-party devices such as barcode scanners, weigh scales, variable frequency drives, and legacy RS-422 instrumentation. With \u003cstrong\u003eisolated channels\u003c\/strong\u003e and support for multiple protocols including \u003cstrong\u003eModbus RTU\/ASCII\u003c\/strong\u003e, it serves as the backbone for integrated automation architectures.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Serial Communication Module (RS-422)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e MasterLogic-200 \/ ML200\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChannels:\u003c\/strong\u003e 2 (RS-422)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation:\u003c\/strong\u003e Channel-to-channel and channel-to-internal logic isolation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupported Protocols:\u003c\/strong\u003e Modbus RTU, Modbus ASCII, dedicated protocol, user-defined protocol\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaud Rate:\u003c\/strong\u003e 300 bps to 115,200 bps (software selectable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eData Format:\u003c\/strong\u003e 7\/8 data bits, 1\/2 stop bits, odd\/even\/none parity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransmission Distance:\u003c\/strong\u003e Up to 1,200 meters (at 9,600 bps)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection:\u003c\/strong\u003e 9-pin D-sub connector (per channel)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Consumption:\u003c\/strong\u003e 40 mA (from 5V internal bus)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal Power:\u003c\/strong\u003e DC 24V (20.4–28.8V) for interface circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (W x H x D):\u003c\/strong\u003e 27.4 mm x 90 mm x 70 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Approx. 90 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e 0°C to +55°C\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual isolated RS-422 channels\u003c\/strong\u003e — run two independent serial networks from one module, reducing communication module count by 50%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong-distance transmission\u003c\/strong\u003e — RS-422 differential signaling supports cable runs up to 1,200 meters, ideal for warehouse and material handling applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-protocol support\u003c\/strong\u003e — built-in Modbus RTU\/ASCII master and slave functions eliminate the need for custom protocol programming\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGalvanic isolation\u003c\/strong\u003e — protects the CPU from ground potential differences between the PLC cabinet and remote field devices\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-speed 115.2 kbps\u003c\/strong\u003e — enables real-time data exchange with high-speed barcode readers and servo controllers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBarcode scanner and RFID reader integration on packaging lines\u003c\/li\u003e\n\u003cli\u003eWeigh scale and load cell indicator communication in batching systems\u003c\/li\u003e\n\u003cli\u003eVFD parameter read\/write for pump and fan control\u003c\/li\u003e\n\u003cli\u003eLegacy PLC and DCS gateway integration via Modbus RTU\u003c\/li\u003e\n\u003cli\u003eRemote terminal unit (RTU) communication in water\/wastewater SCADA\u003c\/li\u003e\n\u003cli\u003eRobotic controller serial interface for coordinate data exchange\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall in I\/O slot\u003c\/strong\u003e — mount the 2MLL-C42A in any available I\/O slot of the ML200 main or expansion base.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect 24V external power\u003c\/strong\u003e — wire DC 24V to the external power terminals for the RS-422 interface drivers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWire RS-422 network\u003c\/strong\u003e — connect TX+, TX-, RX+, and RX- to the field device using twisted-pair shielded cable (minimum 0.5 mm²). Ground the shield at one end only.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfigure protocol in SoftMaster\u003c\/strong\u003e — set baud rate, data format, and protocol type (Modbus RTU master\/slave or dedicated protocol) in the CPU parameter settings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest communication\u003c\/strong\u003e — use the SoftMaster monitor function to verify data register exchange with the connected device.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between 2MLL-C42A and 2MLL-C42B?\u003c\/strong\u003e\u003cbr\u003e\nA: The \u003cstrong\u003e2MLL-C42A\u003c\/strong\u003e is the \u003cstrong\u003estandard\u003c\/strong\u003e RS-422 2-channel module. The \u003cstrong\u003e2MLL-C42B\u003c\/strong\u003e is a \u003cstrong\u003evariant\u003c\/strong\u003e with potentially different connector orientation or conformal coating. Verify your system BOM for the exact suffix required. Electrical specifications are identical.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this for RS-485 networks?\u003c\/strong\u003e\u003cbr\u003e\nA: \u003cstrong\u003eRS-422 is not directly interchangeable with RS-485\u003c\/strong\u003e for multi-drop master-slave networks. For RS-485 applications, use the \u003cstrong\u003e2MLL-C42B\u003c\/strong\u003e or an external RS-422 to RS-485 converter.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the maximum number of devices per channel?\u003c\/strong\u003e\u003cbr\u003e\nA: RS-422 supports \u003cstrong\u003eone driver and up to 10 receivers\u003c\/strong\u003e per channel. For multi-drop Modbus networks with \u0026gt;10 devices, use RS-485 topology instead.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does this module support protocol conversion?\u003c\/strong\u003e\u003cbr\u003e\nA: The 2MLL-C42A supports \u003cstrong\u003eModbus RTU\/ASCII\u003c\/strong\u003e natively. For protocol conversion (e.g., Modbus to Profibus), use the \u003cstrong\u003e2MLL-PMEA\u003c\/strong\u003e (Profibus Master) or \u003cstrong\u003e2MLL-PSEA\u003c\/strong\u003e (Profibus Slave) modules.\u003c\/p\u003e\n\n\u003ch3\u003eSelection Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSelect \u003cstrong\u003e2MLL-C42A\u003c\/strong\u003e for \u003cstrong\u003epoint-to-point or limited multi-drop RS-422\u003c\/strong\u003e serial communication with drives, scales, and barcode readers.\u003c\/li\u003e\n\u003cli\u003eIf you need \u003cstrong\u003eRS-232C\u003c\/strong\u003e instead of RS-422, choose \u003cstrong\u003e2MLL-C22A\u003c\/strong\u003e (2-channel RS-232C).\u003c\/li\u003e\n\u003cli\u003eFor \u003cstrong\u003emixed RS-232C and RS-422\u003c\/strong\u003e on one module, select \u003cstrong\u003e2MLL-CH2A\u003c\/strong\u003e (1ch RS-232C + 1ch RS-422).\u003c\/li\u003e\n\u003cli\u003eAlways use \u003cstrong\u003etwisted-pair shielded cable\u003c\/strong\u003e for RS-422 runs \u0026gt;100 meters to prevent electromagnetic interference.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":53952811008184,"sku":"2MLL-C42A","price":189.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/2MLL-C42A_2.png?v=1787197728","url":"https:\/\/www.globalpetroparts.com\/products\/honeywell-2mll-c42a-2-channel-rs-422-serial-communication-module","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}