{"product_id":"honeywell-2mll-c42b-2-channel-rs-422-rs-485-serial-communication-module","title":"Honeywell 2MLL-C42B 2-Channel RS-422\/RS-485 Serial Communication Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eHoneywell 2MLL-C42B\u003c\/strong\u003e is a \u003cstrong\u003e2-channel RS-422\/RS-485 serial communication module\u003c\/strong\u003e for the \u003cstrong\u003eMasterLogic-200 (ML200)\u003c\/strong\u003e PLC system. It enables robust, noise-immune serial data exchange between the ML200 CPU and third-party devices such as variable frequency drives, weigh scales, barcode readers, and legacy instrumentation. Supporting \u003cstrong\u003eModbus RTU\/ASCII master and slave\u003c\/strong\u003e functions, it serves as a versatile fieldbus gateway for mixed-vendor 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\/RS-485)\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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterface:\u003c\/strong\u003e RS-422 \/ RS-485 (software selectable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation:\u003c\/strong\u003e 1500V between channels and communication lines\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\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 (RS-422 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)\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\u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual isolated channels\u003c\/strong\u003e — run two independent serial networks from one module, reducing hardware count by 50%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRS-422\/RS-485 selectable\u003c\/strong\u003e — software-configurable interface type eliminates the need for separate modules\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1500V galvanic isolation\u003c\/strong\u003e — protects the CPU from ground potential differences and electrical noise on long cable runs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModbus RTU\/ASCII native support\u003c\/strong\u003e — built-in master and slave functions eliminate custom protocol programming\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong-distance capability\u003c\/strong\u003e — 1,200 meter range enables connection to remote field devices without repeaters\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVFD parameter read\/write and status monitoring\u003c\/li\u003e\n\u003cli\u003eWeigh scale and load cell indicator integration\u003c\/li\u003e\n\u003cli\u003eBarcode scanner and RFID reader communication\u003c\/li\u003e\n\u003cli\u003eLegacy PLC and DCS gateway integration\u003c\/li\u003e\n\u003cli\u003eRemote terminal unit (RTU) communication in SCADA systems\u003c\/li\u003e\n\u003cli\u003eMulti-drop Modbus networks with up to 32 devices per channel\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelect RS-422 or RS-485 mode\u003c\/strong\u003e — in SoftMaster, configure each channel for point-to-point (RS-422) or multi-drop (RS-485) operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall in I\/O slot\u003c\/strong\u003e — mount the 2MLL-C42B in any available ML200 I\/O slot.\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 interface drivers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWire serial network\u003c\/strong\u003e — connect TX+, TX-, RX+, and RX- (RS-422) or A\/B (RS-485) using twisted-pair shielded cable. 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).\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\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between 2MLL-C42B and 2MLL-C42A?\u003c\/strong\u003e\u003cbr\u003e\nA: The \u003cstrong\u003e2MLL-C42B\u003c\/strong\u003e is the \u003cstrong\u003estandard\u003c\/strong\u003e RS-422\/RS-485 2-channel module. The \u003cstrong\u003e2MLL-C42A\u003c\/strong\u003e is a \u003cstrong\u003evariant\u003c\/strong\u003e with potentially different firmware or connector orientation. Both support identical electrical specifications and protocols. Verify your system BOM for the exact suffix required.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this for RS-232C devices?\u003c\/strong\u003e\u003cbr\u003e\nA: \u003cstrong\u003eNo.\u003c\/strong\u003e For RS-232C applications, use the \u003cstrong\u003e2MLL-C22A\u003c\/strong\u003e (2-channel RS-232C) or \u003cstrong\u003e2MLL-CH2A\u003c\/strong\u003e (1ch RS-232C + 1ch RS-422) module.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the maximum number of devices per RS-485 channel?\u003c\/strong\u003e\u003cbr\u003e\nA: RS-485 supports \u003cstrong\u003eup to 32 devices\u003c\/strong\u003e per channel (1 driver + 31 receivers). For networks with \u0026gt;32 devices, use RS-485 repeaters or split into multiple channels.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does this module support protocol conversion?\u003c\/strong\u003e\u003cbr\u003e\nA: The 2MLL-C42B 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\u003ch3\u003eSelection Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSelect \u003cstrong\u003e2MLL-C42B\u003c\/strong\u003e for \u003cstrong\u003eRS-422\/RS-485 serial communication\u003c\/strong\u003e with drives, scales, and barcode readers.\u003c\/li\u003e\n\u003cli\u003eIf you need \u003cstrong\u003eRS-232C\u003c\/strong\u003e instead, 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.\u003c\/li\u003e\n\u003cli\u003eAlways use \u003cstrong\u003etwisted-pair shielded cable\u003c\/strong\u003e for RS-422\/RS-485 runs \u0026gt;100 meters to prevent electromagnetic interference.\u003c\/li\u003e\n\u003cli\u003eVerify your \u003cstrong\u003etermination resistor\u003c\/strong\u003e requirements for RS-485 multi-drop networks to prevent signal reflections.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":53959280689336,"sku":"2MLL-C42B","price":148.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/2MLL-C42B.png?v=1787197709","url":"https:\/\/www.globalpetroparts.com\/products\/honeywell-2mll-c42b-2-channel-rs-422-rs-485-serial-communication-module","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}