{"product_id":"rdm6300-rfid-rf-module-uart-serial-output-card-reader","title":"RDM6300 RFID RF Module UART Serial Output Card Reader 125kHz","description":"\n\u003ch2\u003eRDM6300 Single Chip RFID RF Module – UART Serial Output Card Reader\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eRDM6300 RFID RF Module\u003c\/strong\u003e is a compact, single-chip 125kHz radio frequency identification reader designed for seamless integration into DIY electronics, access control systems, automation projects, and Arduino\/Raspberry Pi builds. Featuring a clean \u003cstrong\u003eUART serial output\u003c\/strong\u003e, it makes reading standard 125kHz EM4100-compatible RFID cards and key fobs fast and straightforward — no complex decoding required.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Frequency:\u003c\/strong\u003e 125 kHz — compatible with EM4100 and compatible RFID cards\/tags\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUART Serial Output:\u003c\/strong\u003e Simple TTL serial communication (9600 bps) for easy microcontroller integration\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSingle Chip Design:\u003c\/strong\u003e Compact RDM6300 chipset for space-saving PCB layouts\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Works with Arduino, Raspberry Pi, ESP8266\/ESP32, and most UART-capable microcontrollers\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Power Consumption:\u003c\/strong\u003e Ideal for battery-operated and embedded applications\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReading Distance:\u003c\/strong\u003e Up to ~50mm depending on tag type and antenna configuration\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOnboard Antenna Connection:\u003c\/strong\u003e Supports external coil antenna for extended range\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSupply Voltage:\u003c\/strong\u003e DC 5V — straightforward power requirements\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePerfect For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDIY access control and door lock systems\u003c\/li\u003e\n  \u003cli\u003eAttendance and time-tracking projects\u003c\/li\u003e\n  \u003cli\u003eArduino and Raspberry Pi RFID experiments\u003c\/li\u003e\n  \u003cli\u003eInventory tracking and asset tagging\u003c\/li\u003e\n  \u003cli\u003eMaker spaces, prototyping, and electronics education\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChip\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRDM6300\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e125 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInterface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUART (TTL Serial)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBaud Rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9600 bps\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupply Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 5V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCard Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEM4100 \u0026amp; compatible 125kHz RFID tags\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRead Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to ~50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eExplore More DIY \u0026amp; Electronics Essentials\u003c\/h3\u003e\n\u003cp\u003eLooking to expand your maker toolkit? Check out these related products from our store:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/round-aluminum-wire-diy-jewelry-making-1mm-3mm\"\u003eRound Aluminum Wire 1mm–3mm | DIY Jewelry Making Wire\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/ccb-flat-round-spacer-beads-diy-jewelry-making\"\u003e4\/6mm CCB Flat Round Spacer Beads DIY Jewelry Making 100-200pcs\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.epa.gov\/recycle\/used-lithium-ion-batteries\" target=\"_blank\" rel=\"noopener\"\u003eEPA guidance on lithium-ion battery handling\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the RDM6300 RFID RF Module and what does it do?\u003c\/h4\u003e\n\u003cp\u003eA: The RDM6300 is a single-chip 125kHz RFID reader module that outputs card data via UART serial communication. When a compatible 125kHz RFID card or key fob is brought within range, the module reads the card's unique ID and transmits it as a serial data string — making it easy to integrate into microcontroller projects for access control, identification, or automation tasks.\u003c\/p\u003e\n\u003ch4\u003eQ: Which microcontrollers is the RDM6300 RFID module compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: The RDM6300 module communicates via standard TTL UART serial output at 9600 bps, making it compatible with virtually any microcontroller that supports serial communication — including Arduino (Uno, Mega, Nano), Raspberry Pi, ESP8266, ESP32, STM32, and more. Simply connect the TX pin to your microcontroller's RX pin and power the module at 5V.\u003c\/p\u003e\n\u003ch4\u003eQ: What types of RFID cards and tags work with the RDM6300 module?\u003c\/h4\u003e\n\u003cp\u003eA: The RDM6300 operates at 125kHz and is compatible with EM4100 and EM4100-protocol-compatible RFID cards, key fobs, and tags. It does NOT support 13.56MHz cards such as MIFARE or NFC tags — ensure your cards or tags are rated for 125kHz before purchase.\u003c\/p\u003e\n\u003ch4\u003eQ: How far can the RDM6300 module read RFID cards?\u003c\/h4\u003e\n\u003cp\u003eA: The read range is typically up to approximately 50mm (5cm), depending on the size and type of the RFID tag and the antenna coil used. Using a larger external antenna coil can help extend the effective read distance in your project.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the RDM6300 RFID RF Module and what does it do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The RDM6300 is a single-chip 125kHz RFID reader module that outputs card data via UART serial communication. 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