{"product_id":"2mll-ch2a-honeywell-serial-communication-interface-module","title":"2MLL-CH2A | Honeywell | Serial Communication Interface Module","description":"\u003cp\u003eThe \u003cstrong\u003eHoneywell 2MLL-CH2A\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e2MLL-CH2A\u003c\/strong\u003e Serial Communication Interface Modules, operates as a dedicated hardware component for serial data protocol handling within Master-K platform PLC networks. It establishes dual asynchronous channels to route field device data via RS-232C and RS-422\/485 serial interfaces directly into the central processor memory map.\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\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\u003e2MLL-CH2A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eIndustrial Standard Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e119 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard Rack Slot Width\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e310 mA (Backplane 5 VDC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhysical Interface\u003c\/td\u003e\n\u003ctd\u003e1 Channel RS-232C, 1 Channel RS-422\/485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Speed\u003c\/td\u003e\n\u003ctd\u003e300 to 115200 bps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Distance\u003c\/td\u003e\n\u003ctd\u003eRS-232C: 15 m; RS-422\/485: 500 m max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Protocols\u003c\/td\u003e\n\u003ctd\u003eModbus RTU\/ASCII Slave, P2P Master, User-Defined\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003e4-20 mA HART Loop Protocol \u0026amp; DCS Integration\u003c\/h3\u003e\n\u003cp\u003eWhile operating primarily as an asynchronous serial processor, the module enables protocol mapping interfaces that interact with field instrument networks. Integrated channel-to-channel isolation safeguards backplane communications from electrical noise, common-mode ground potential shifts, and transient surges originating on external RS-422\/485 multidrop lines. This isolation barrier prevents loop corruption and maintains signal processing integrity across long line distances when transmitting digitized process values from legacy 4-20 mA transmitters or serial gateway bridges.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What is the backplane current draw for the 2MLL-CH2A module during active transmission?\u003c\/p\u003e\n\u003cp\u003eA: The module draws a continuous current of 310 mA from the internal 5 VDC backplane bus power supply. Ensure the base rack power supply unit has sufficient overhead capacity prior to adding channels.\u003c\/p\u003e\n\u003cp\u003eQ: How are network parameters and protocol selections assigned to the dual serial ports?\u003c\/p\u003e\n\u003cp\u003eA: Parameter assignments including baud rate (300 to 115200 bps), data bits (7 or 8), parity, and protocol modes (Modbus RTU\/ASCII or P2P) are configured via the SoftMaster-NM programming environment and flashing memory down to the module interface.\u003c\/p\u003e\n\u003cp\u003eQ: What topology configuration options exist for the RS-422\/485 channel?\u003c\/p\u003e\n\u003cp\u003eA: The RS-422\/485 port supports 1:1, 1:N, and N:M multi-drop networking configurations with station numbers assigned from 0 to 31, servicing up to 32 network nodes across a maximum distance of 500 m.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003ePower down the PLC rack chassis completely before inserting or removing the module from the backplane slot.\u003c\/li\u003e\n\u003cli\u003eVerify that shield wires for RS-422\/485 serial cables are grounded at a single point to prevent ground loops from introducing serial framing errors.\u003c\/li\u003e\n\u003cli\u003eKeep RS-232C cable runs within the 15 m physical length limit to avoid signal attenuation and parity faults at higher baud rates.\u003c\/li\u003e\n\u003cli\u003eEnsure terminating resistors (typically 120 ohm) are enabled or connected across the physical end-nodes of the RS-485 differential bus line.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":53599096734005,"sku":"2MLL-CH2A","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/2MLL-CH2A2.png?v=1789609527","url":"https:\/\/www.5gplc.com\/products\/2mll-ch2a-honeywell-serial-communication-interface-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}