{"product_id":"2-channel-ethernet-relay-module-modbus-rtu-w5500-stm32-dc7-36v","title":"2-Channel Ethernet Relay Module Modbus RTU W5500 STM32 DC7-36V","description":"\n\u003ch2\u003e2-Channel Ethernet Relay Module — Modbus RTU, W5500 TCP Server, STM32 Board\u003c\/h2\u003e\n\u003cp\u003eTake full remote control of your electrical switching applications over a standard LAN with this robust 2-Channel Ethernet Relay Module. Built around a stable 32-bit STM32F103C6T6 MCU and the hardware-accelerated W5500 Ethernet chip, this module delivers reliable Modbus RTU communication over TCP\/IP — making it ideal for industrial automation, smart home projects, DIY electronics, and remote switching systems. 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 ensures consistent performance and fast response times.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eW5500 Ethernet Chip:\u003c\/strong\u003e Full hardware TCP\/IP protocol stack with 10\/100 Mbps support — no software TCP overhead, maximum reliability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModbus RTU Protocol:\u003c\/strong\u003e Fully compatible with the standard Modbus RTU protocol for seamless integration with PLCs, SCADA systems, and automation software.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTCP Server Mode with DHCP:\u003c\/strong\u003e Operates as a TCP Server on port 5000; supports DHCP for automatic IP assignment. View IP address via serial port (UART baud rate: 115200).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2 Independent Relay Channels:\u003c\/strong\u003e Each relay rated at 10A\/250VAC or 10A\/30VDC, capable of 100,000 continuous switching cycles with diode discharge protection for long service life.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible Switching Modes:\u003c\/strong\u003e Supports manual, flashing on-off, and flashing off modes. Flashing delay base is 0.1 seconds; maximum configurable time: up to 6,553.5 seconds (0xFFFF × 0.1s).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfigurable Device Address:\u003c\/strong\u003e Range 1–255 (default: 255) with power-off memory saving.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Input Voltage Range:\u003c\/strong\u003e DC 7–36V input via 5.08mm terminal block, with built-in reverse-polarity input protection.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOnboard Indicator Lights:\u003c\/strong\u003e Dedicated LEDs for power status and each relay channel for at-a-glance monitoring.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSecondary Development Ready:\u003c\/strong\u003e Reserved UART serial port and SWD programming port allow custom firmware flashing and advanced development.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOnboard MCU Reset Button:\u003c\/strong\u003e Convenient hardware reset without disconnecting power.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eMCU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eSTM32F103C6T6 (32-bit)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eEthernet Chip\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eW5500 (Hardware TCP\/IP Stack)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eNetwork Speed\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e10\/100 Mbps\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eProtocol\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eModbus RTU over TCP\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eTCP Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e5000\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eUART Baud Rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e115200\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eRelay Channels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eRelay Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e10A\/250VAC, 10A\/30VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eRelay Endurance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e100,000 switching cycles\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eInput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eDC 7–36V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eConnector\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e5.08mm terminal block\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eDevice Address\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e1–255 (default 255, power-off saving)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\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 (STM32 + W5500)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSafety \u0026amp; Standards Reference\u003c\/h3\u003e\n\u003cp\u003eFor guidance on electrical safety standards relevant to relay modules and industrial control equipment, visit the \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOSHA Electrical Safety resource page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What communication protocol does this 2-channel Ethernet relay module support?\u003c\/h4\u003e\n\u003cp\u003eA: This module supports the standard Modbus RTU protocol over TCP\/IP. It operates as a TCP Server on port 5000, using the W5500 hardware TCP\/IP stack chip for highly reliable LAN-based relay control without software TCP overhead.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the input voltage range and power connector type for this STM32 relay module?\u003c\/h4\u003e\n\u003cp\u003eA: The module accepts a wide DC 7–36V input voltage range, making it compatible with a variety of power supplies. It uses a 5.08mm terminal block connector and includes built-in reverse-polarity input protection to safeguard the board from accidental miswiring.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use this relay module for custom firmware or secondary development?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The board features a reserved UART serial port and an SWD program burning port, enabling developers to flash custom firmware and extend functionality for specialized automation or IoT applications.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I find the IP address assigned to the relay module after connecting it to a LAN?\u003c\/h4\u003e\n\u003cp\u003eA: The module supports DHCP for automatic IP assignment. You can view the assigned IP address via the onboard UART serial port at a baud rate of 115200 using any standard serial monitor or terminal application.\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 2-channel Ethernet relay module support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This module supports the standard Modbus RTU protocol over TCP\/IP. 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