{"product_id":"2-channel-ethernet-relay-module-modbus-rtu-w5500-stm32-lan-control","title":"2-Channel Ethernet Relay Module Modbus RTU W5500 STM32 LAN","description":"\n\u003ch2\u003e2-Channel Ethernet Relay Module — Modbus RTU, W5500, STM32, LAN Control\u003c\/h2\u003e\n\u003cp\u003eTake full command of your automation projects over a standard LAN connection with this robust \u003cstrong\u003e2-Channel Ethernet Relay Module\u003c\/strong\u003e. Built around the reliable STM32F103C6T6 32-bit MCU and the W5500 full-hardware TCP\/IP Ethernet chip, this board delivers stable, low-latency network control using the industry-standard \u003cstrong\u003eModbus RTU protocol\u003c\/strong\u003e. Whether you're building a smart home, industrial automation rig, or a custom IoT controller, this module offers the flexibility and durability to get the job done. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSTM32F103C6T6 MCU:\u003c\/strong\u003e Mature, stable 32-bit microcontroller for dependable performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eW5500 Ethernet Chip:\u003c\/strong\u003e Full hardware TCP\/IP protocol stack supporting 10\/100 Mbps speeds.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModbus RTU Protocol:\u003c\/strong\u003e Industry-standard communication for seamless integration with PLCs, HMIs, and SCADA systems.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTCP Server Mode:\u003c\/strong\u003e Operates as a TCP Server; supports DHCP IP assignment on port 5000.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIP Visibility via Serial Port:\u003c\/strong\u003e View the module's IP address through the UART interface at 115200 baud.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2 x Relay Channels:\u003c\/strong\u003e Onboard 5V relays rated 10A\/250VAC and 10A\/30VDC — rated for up to 100,000 switching cycles each.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible Output Modes:\u003c\/strong\u003e Supports manual, flashing ON\/OFF, and flashing OFF modes; flashing interval base is 0.1 seconds, up to 6,553.5 seconds maximum.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDevice Addressing:\u003c\/strong\u003e Configurable address range 1–255 (default: 255) with power-off memory retention.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiode Discharge Protection:\u003c\/strong\u003e Built-in protection circuitry for each relay channel.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOnboard Indicator Lights:\u003c\/strong\u003e Power and relay-status LEDs for at-a-glance monitoring.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMCU Reset Button:\u003c\/strong\u003e Conveniently located onboard reset for quick restarts.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSecondary Development Ready:\u003c\/strong\u003e Reserved UART serial port and SWD programming port for custom firmware.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Power Input:\u003c\/strong\u003e DC 7–36V via 5.08mm terminal block; includes input reverse-polarity protection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMCU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSTM32F103C6T6 (32-bit)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEthernet Chip\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eW5500 (Full Hardware TCP\/IP)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNetwork Speed\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10\/100 Mbps\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProtocol\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eModbus RTU over TCP\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTCP Mode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eServer (Port 5000, DHCP supported)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUART Baud Rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e115200\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelay Channels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelay Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10A\/250VAC, 10A\/30VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelay Endurance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100,000 switching cycles\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 7–36V (5.08mm terminal)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVoltage Safety\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBelow 50VAC \/ 75VDC (LVD compliant)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHazardous Chemicals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× 2-Channel Ethernet Relay Module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDue to monitor and lighting variations, actual product color may differ slightly from images.\u003c\/li\u003e\n  \u003cli\u003ePlease allow 1mm–1cm tolerance due to manual measurement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on industrial automation networking standards, refer to the NIST Engineering Laboratory. For electrical safety guidelines, visit \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener\"\u003eOSHA Electrical Safety\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What communication protocol does this Ethernet relay module support?\u003c\/h4\u003e\n\u003cp\u003eA: This module supports the standard \u003cstrong\u003eModbus RTU protocol\u003c\/strong\u003e over TCP\/IP, making it fully compatible with PLCs, SCADA systems, HMIs, and other industrial automation equipment that use Modbus for device communication.\u003c\/p\u003e\n\u003ch4\u003eQ: What is the power supply range for this relay module?\u003c\/h4\u003e\n\u003cp\u003eA: The module accepts a wide input voltage of \u003cstrong\u003eDC 7–36V\u003c\/strong\u003e via a 5.08mm terminal block. It also features built-in reverse-polarity protection, so accidental reverse wiring won't damage the board.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I use this module for custom firmware development?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The board includes reserved \u003cstrong\u003eUART serial port\u003c\/strong\u003e and \u003cstrong\u003eSWD program burning port\u003c\/strong\u003e interfaces, supporting full secondary development for custom applications built on the STM32 platform.\u003c\/p\u003e\n\u003ch4\u003eQ: How many relay channels are available, and what are the ratings?\u003c\/h4\u003e\n\u003cp\u003eA: There are \u003cstrong\u003e2 onboard relay channels\u003c\/strong\u003e, each rated at \u003cstrong\u003e10A\/250VAC\u003c\/strong\u003e and \u003cstrong\u003e10A\/30VDC\u003c\/strong\u003e. Each relay is designed to withstand up to \u003cstrong\u003e100,000 switching cycles\u003c\/strong\u003e, with diode discharge protection for extended service life.\u003c\/p\u003e\n\u003ch4\u003eQ: Does the module support DHCP for automatic IP assignment?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. When operating in TCP Server mode on \u003cstrong\u003eport 5000\u003c\/strong\u003e, the module supports DHCP for automatic IP address assignment. The assigned IP address can be viewed through the onboard UART serial port at a baud rate of 115200.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What communication protocol does this Ethernet relay module support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This module supports the standard Modbus RTU protocol over TCP\/IP, making it fully compatible with PLCs, SCADA systems, HMIs, and other industrial automation equipment that use Modbus for device communication.\"}}, {\"@type\": \"Question\", \"name\": \"What is the power supply range for this relay module?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The module accepts a wide input voltage of DC 7–36V via a 5.08mm terminal block. 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