{"product_id":"honeywell-2mll-ch2a-mixed-serial-communication-module-rs-232c-rs-422-rs-485","title":"Honeywell 2MLL-CH2A Mixed Serial Communication Module RS-232C RS-422\/RS-485","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eHoneywell 2MLL-CH2A\u003c\/strong\u003e is a \u003cstrong\u003emixed serial communication module\u003c\/strong\u003e featuring \u003cstrong\u003e1-channel RS-232C and 1-channel RS-422\/RS-485\u003c\/strong\u003e for the \u003cstrong\u003eMasterLogic-200 (ML200)\u003c\/strong\u003e PLC system. It provides flexible serial connectivity for applications requiring both local RS-232C programming\/diagnostics and long-distance RS-422\/RS-485 fieldbus communication on a single module. Supporting \u003cstrong\u003eModbus RTU\/ASCII\u003c\/strong\u003e and user-defined protocols, it eliminates the need for two separate communication modules.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Mixed Serial Communication Module (RS-232C + 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 (1x RS-232C, 1x RS-422\/RS-485)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRS-232C Connector:\u003c\/strong\u003e 9-pin D-sub (male)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRS-422\/RS-485 Connector:\u003c\/strong\u003e 9-pin D-sub (female)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation:\u003c\/strong\u003e 1500V on RS-422\/RS-485 channel; non-isolated RS-232C\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 (both channels)\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 RS-232C: 15 m; RS-422\/RS-485: 1,200 m\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\n\n\u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMixed media on one module\u003c\/strong\u003e — RS-232C for local HMI\/programming and RS-422\/RS-485 for remote field devices, reducing module count by 50%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1500V isolation on RS-422\/RS-485\u003c\/strong\u003e — protects the CPU from ground loops and electrical noise on long fieldbus 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\u003eCompact single-slot design\u003c\/strong\u003e — 27.4 mm width saves DIN rail space compared to installing separate RS-232C and RS-422 modules\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndependent channel configuration\u003c\/strong\u003e — each channel can operate at different baud rates and protocols simultaneously\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLocal operator panel (RS-232C) plus remote VFD network (RS-485) on one module\u003c\/li\u003e\n\u003cli\u003eProgramming port (RS-232C) plus Modbus RTU fieldbus (RS-485) for maintenance flexibility\u003c\/li\u003e\n\u003cli\u003eBarcode reader (RS-232C) plus weigh scale network (RS-422) in packaging systems\u003c\/li\u003e\n\u003cli\u003eHMI connection (RS-232C) plus legacy PLC gateway (RS-485) in retrofit projects\u003c\/li\u003e\n\u003cli\u003eAny application requiring both short-range and long-range serial communication\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-CH2A 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\u003eConnect RS-232C device\u003c\/strong\u003e — use a standard 9-pin D-sub cable to connect the RS-232C port to a programming laptop, HMI, or local device (max 15 m).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect RS-422\/RS-485 network\u003c\/strong\u003e — wire TX+, TX-, RX+, RX- (RS-422) or A\/B (RS-485) using twisted-pair shielded cable (max 1,200 m).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfigure channels in SoftMaster\u003c\/strong\u003e — set baud rate, data format, and protocol type independently for each channel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest both channels\u003c\/strong\u003e — verify RS-232C communication with a local HMI and RS-485 Modbus communication with remote devices.\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-CH2A and 2MLL-C42A?\u003c\/strong\u003e\u003cbr\u003e\nA: The \u003cstrong\u003e2MLL-CH2A\u003c\/strong\u003e has \u003cstrong\u003e1x RS-232C + 1x RS-422\/RS-485\u003c\/strong\u003e. The \u003cstrong\u003e2MLL-C42A\u003c\/strong\u003e has \u003cstrong\u003e2x RS-422\u003c\/strong\u003e only. Choose CH2A when you need RS-232C for local programming or HMI; choose C42A for pure RS-422 fieldbus applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is the RS-232C channel isolated?\u003c\/strong\u003e\u003cbr\u003e\nA: \u003cstrong\u003eNo.\u003c\/strong\u003e The RS-232C channel is \u003cstrong\u003enon-isolated\u003c\/strong\u003e and intended for local connections within the same cabinet. The RS-422\/RS-485 channel has 1500V isolation for fieldbus networks.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use the RS-232C channel for Modbus?\u003c\/strong\u003e\u003cbr\u003eA: \u003cstrong\u003eYes.\u003c\/strong\u003e Both channels support Modbus RTU\/ASCII. The RS-232C channel can communicate with a local Modbus device or HMI, while the RS-485 channel communicates with the fieldbus network.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the maximum RS-485 device count?\u003c\/strong\u003e\u003cbr\u003e\nA: RS-485 supports \u003cstrong\u003eup to 32 devices\u003c\/strong\u003e per network (1 driver + 31 receivers). For larger networks, use repeaters or split across multiple modules.\u003c\/p\u003e\n\n\u003ch3\u003eSelection Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eChoose \u003cstrong\u003e2MLL-CH2A\u003c\/strong\u003e when you need \u003cstrong\u003eboth RS-232C (local) and RS-422\/RS-485 (remote)\u003c\/strong\u003e on a single module.\u003c\/li\u003e\n\u003cli\u003eFor \u003cstrong\u003e2x RS-232C\u003c\/strong\u003e, select \u003cstrong\u003e2MLL-C22A\u003c\/strong\u003e instead.\u003c\/li\u003e\n\u003cli\u003eFor \u003cstrong\u003e2x RS-422\/RS-485\u003c\/strong\u003e, select \u003cstrong\u003e2MLL-C42A\u003c\/strong\u003e or \u003cstrong\u003e2MLL-C42B\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eAlways use \u003cstrong\u003eshielded twisted-pair cable\u003c\/strong\u003e for RS-422\/RS-485 runs \u0026gt;10 meters.\u003c\/li\u003e\n\u003cli\u003eInstall \u003cstrong\u003etermination resistors\u003c\/strong\u003e at both ends of RS-485 multi-drop networks to prevent signal reflections.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":53959354089656,"sku":"2MLL-CH2A","price":94.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/2MLL-CH2A_2.png?v=1787197684","url":"https:\/\/www.globalpetroparts.com\/products\/honeywell-2mll-ch2a-mixed-serial-communication-module-rs-232c-rs-422-rs-485","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}