{"product_id":"ttl-to-rs485-converter-module-auto-flow-control-arduino","title":"TTL to RS485 Converter Module – Auto Flow Control for Arduino","description":"\u003ch2\u003eLOTHYE TTL to RS485 Converter Module – Hardware Auto Flow Control\u003c\/h2\u003e\n\u003cp\u003eUpgrade your serial communication projects with the \u003cstrong\u003eLOTHYE TTL to RS485 Converter Module\u003c\/strong\u003e. Designed for Arduino, microcontrollers, and industrial UART applications, this compact board seamlessly converts TTL signals to RS485 with fully automatic hardware flow control — no extra code or manual direction-switching needed. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose This TTL to RS485 Module?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Voltage Input (3.0V – 30V):\u003c\/strong\u003e Compatible with both 3.3V and 5.0V systems, making it ideal for a broad range of microcontroller platforms including Arduino, STM32, ESP32, and Raspberry Pi.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHardware Automatic Flow Control:\u003c\/strong\u003e Send and receive direction switches automatically — operate it as simply as a standard UART serial port.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh EMC \u0026amp; EMI Performance:\u003c\/strong\u003e Industrial-grade imported chips deliver exceptional anti-interference performance for noisy electrical environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLightning Protection Design:\u003c\/strong\u003e Built-in RS485 lightning protection for safe long-distance and outdoor field installations.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLong Transmission Distance:\u003c\/strong\u003e Tested up to 850 meters using 2×1.5mm² cable; recommended use within 800 meters (add a repeater beyond 800m).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Baud Rate Support:\u003c\/strong\u003e 110 to 256,000 bps — suitable for slow sensor networks and high-speed data links alike.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Node Network:\u003c\/strong\u003e Supports up to 40 nodes on the same RS485 bus for scalable multi-device communication.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHot-Swappable:\u003c\/strong\u003e Connect and disconnect devices without signal lock-up or bus-dead phenomena.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRXD \/ TXD LED Indicators:\u003c\/strong\u003e Visual send\/receive status indicators for easy debugging at a glance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e120Ω Matching Resistor:\u003c\/strong\u003e Jumper-selectable termination resistor; short R0 to enable — recommended for long-distance runs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard 2.54mm Pin Pitch:\u003c\/strong\u003e Easy integration into breadboards and custom PCBs for secondary development.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Operating Temperature:\u003c\/strong\u003e –40°C to +85°C for reliable performance in demanding industrial and field environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCommunication Standard:\u003c\/strong\u003e TTL UART ↔ RS485 half-duplex\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSupply Voltage:\u003c\/strong\u003e 3.0V – 30V (limit: 33V; minimum: 2.8V)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Logic Levels:\u003c\/strong\u003e 3.3V and 5.0V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBaud Rate:\u003c\/strong\u003e 110 – 256,000 bps\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax Nodes on Bus:\u003c\/strong\u003e 40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax Transmission Distance:\u003c\/strong\u003e ~800 m (recommended)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e –40°C to +85°C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTermination Resistor:\u003c\/strong\u003e 120Ω (jumper-selectable)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePin Pitch:\u003c\/strong\u003e 2.54 mm standard\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Terminal block + silicone wire\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× TTL to RS485 Converter Module\u003c\/li\u003e\n  \u003cli\u003e1× Terminal Block\u003c\/li\u003e\n  \u003cli\u003eSilicone Connection Wire\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePerfect For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eArduino \u0026amp; microcontroller serial communication projects\u003c\/li\u003e\n  \u003cli\u003eIndustrial automation and PLC communication\u003c\/li\u003e\n  \u003cli\u003eLong-distance sensor networks\u003c\/li\u003e\n  \u003cli\u003eRS485 Modbus systems\u003c\/li\u003e\n  \u003cli\u003eSmart home and IoT data bus applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eExplore more tools for your electronics projects:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Is this TTL to RS485 module compatible with Arduino and ESP32?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The module supports both 3.3V and 5.0V logic levels, making it fully compatible with Arduino (5V), ESP32 (3.3V), STM32, Raspberry Pi, and other popular microcontroller platforms without any additional level-shifting hardware.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this RS485 converter module require manual direction control in code?\u003c\/h4\u003e\n\u003cp\u003eA: No. This module features hardware automatic flow control, meaning the transmit\/receive direction switches automatically based on data activity. You can use it just like a standard serial (UART) port without writing any extra direction-control logic in your firmware.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How far can this module transmit RS485 signals?\u003c\/h4\u003e\n\u003cp\u003eA: The module has been tested up to 850 meters using 2×1.5mm² cable. For reliable operation, use within 800 meters. For distances beyond 800 meters, it is recommended to add an RS485 repeater. Enable the built-in 120Ω termination resistor (short R0) for long-distance runs to reduce signal reflections.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I connect multiple devices to the same RS485 bus with this module?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The module supports multi-node communication, allowing at least 40 nodes to be connected on the same RS485 network — ideal for Modbus RTU networks and distributed sensor systems.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Is this TTL to RS485 module compatible with Arduino and ESP32?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! The module supports both 3.3V and 5.0V logic levels, making it fully compatible with Arduino (5V), ESP32 (3.3V), STM32, Raspberry Pi, and other popular microcontroller platforms without any additional level-shifting hardware.\"}}, {\"@type\": \"Question\", \"name\": \"Does this RS485 converter module require manual direction control in code?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No. This module features hardware automatic flow control, meaning the transmit\/receive direction switches automatically based on data activity. You can use it just like a standard serial (UART) port without writing any extra direction-control logic in your firmware.\"}}, {\"@type\": \"Question\", \"name\": \"How far can this module transmit RS485 signals?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The module has been tested up to 850 meters using 2×1.5mm² cable. For reliable operation, use within 800 meters. 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