{"product_id":"tc-mux021-51404391-125-serial-communication-interface-module-honeywell","title":"TC-MUX021 | 51404391-125 | Serial Communication Interface Module | Honeywell","description":"\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTC-MUX021 (51404391-125)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-performance serial multiplexer interface designed for integration within Honeywell Experion PKS and legacy PLC architectures. This module acts as a specialized communication bridge, enabling the controller backplane to interface with serial-based field devices and peripheral subsystems.\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"citation-5 citation-end-5\"\u003eEngineered for industrial reliability, it manages data flow across multiple serial channels, ensuring deterministic timing and data integrity for critical process variables.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eModel Identification\u003c\/strong\u003e:\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTC-MUX021\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan class=\"citation-4\"\u003e\u003c\/span\u003e\u003cstrong\u003eAssociated Part Number\u003c\/strong\u003e\u003cspan class=\"citation-4\"\u003e:\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"citation-4 citation-end-4\"\u003e51404391-125\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePrimary Function\u003c\/strong\u003e: Serial Multiplexing \/ Device Interface\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e: 24 VDC (Nominal)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCurrent Consumption\u003c\/strong\u003e: 1.0 to 1.3 Amps\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eInput Current\u003c\/strong\u003e: 5.6 mA (typical signal load)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eForm Factor\u003c\/strong\u003e: Rack-mounted PLC I\/O slot\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePhysical Mass\u003c\/strong\u003e: 0.48 kg (approx. 1.06 lbs)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan class=\"citation-3\"\u003e\u003c\/span\u003e\u003cstrong\u003eLifecycle Status\u003c\/strong\u003e\u003cspan class=\"citation-3 citation-end-3\"\u003e: Discontinued by Manufacturer (Legacy Spares Support)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eOperational Utility and Integration\u003c\/h2\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTC-MUX021 (51404391-125)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis frequently deployed in process industries where legacy serial sensors, barcode readers, or specialized flow meters must communicate with a modern DCS or PLC backplane. Its robust 24VDC design and high-current tolerance (up to 1.3A) reflect its capability to handle complex multiplexing tasks across multiple ports without signal degradation. As a discontinued component, it remains a vital inventory item for maintaining the communication infrastructure of existing Honeywell control rooms.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat specific serial protocols does this module support?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTC-MUX021\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003etypically interfaces with standard RS-232, RS-422, or RS-485 signaling, depending on the software configuration and cable pinouts used at the terminal block.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan this module be hot-swapped in a powered rack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhile many Honeywell I\/O modules support live insertion, it is best practice to verify that the serial communication loop is paused or that the redundant controller is active before swapping the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTC-MUX021 (51404391-125)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eto avoid transient data errors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":52454345244981,"sku":"TC-MUX021 51404391-125","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/TC-MUX02151404391-125.png?v=1773889863","url":"https:\/\/www.5gplc.com\/products\/tc-mux021-51404391-125-serial-communication-interface-module-honeywell","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}