{"product_id":"e91-dtu-lora-rs485-wireless-modem-30-37dbm-ip67-modbus-ebyte","title":"E91-DTU LoRa RS485 Wireless Modem 30-37dBm IP67 Modbus","description":"\u003cp\u003eE91-DTU series is an industrial-grade LoRa RS485 wireless data transmitter featuring up to 37dBm output, IP67 waterproof protection, and Modbus protocol support for high-reliability, long-range communication in harsh environments.\u003c\/p\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #ddd;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #ddd;\"\u003eParameter\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #ddd;\"\u003eSpecifications\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003eProduct Models\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003eE91-DTU(400SL30) \/ E91-DTU(900SL30) \/ E91-DTU(400SL37)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003eFrequency Range\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003e410.125-493.125 MHz \/ 850.125-930.125 MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003eTransmit Power\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003e30dBm (1W) \/ 37dBm (5W) Adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003eCommunication Interface\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003eRS485 (5-pin M12 Waterproof Connector)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003eIngress Protection\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003eIP67 (Sealed with Silicone O-ring and Resin Potting)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003e8V - 28V DC (Standard 12V\/24V Industrial Power)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003eLogic Support\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003eModbus RTU, LBT, RSSI, AT\/HEX Commands\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eDownload Manual\u003c\/h2\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/5911\/1885\/files\/1_b362c85c-a237-4ecc-b152-d230c4ad3f49.jpg?v=1778846374\" alt=\"E91-DTU LoRa RS485 Wireless Modem Overview - EBYTE\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/5911\/1885\/files\/2_9160bb70-1fe9-4c2b-8aea-94d9250b641d.jpg?v=1778846374\" alt=\"E91-DTU Industrial LoRa DTU Product Appearance\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/5911\/1885\/files\/3_d3116b6e-88c9-4270-84f0-b2c6c03dadf6.jpg?v=1778846374\" alt=\"E91-DTU Dimensions and Mechanical Drawing\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/5911\/1885\/files\/4_e1b61c5a-6e2c-4c1e-8fba-2b7ee9a81d73.jpg?v=1778846374\" alt=\"E91-DTU IP67 Waterproof Structure and M12 Connector\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"E91-DTU RS485 Wiring Diagram and Pin Definition\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/5911\/1885\/files\/5_6f0d187c-4703-4503-bcf2-09ccbc5ea6c8.jpg?v=1778846374\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"E91-DTU LoRa Communication Parameters Configuration\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/5911\/1885\/files\/6_c6c6ce4d-8883-4b94-887d-f07eeaa8db05.jpg?v=1778846374\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"E91-DTU Modbus RTU Protocol Support and AT Command Interface\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/5911\/1885\/files\/7_7c1fa313-b85c-4ddc-803e-3eb299d57cc2.jpg?v=1778846374\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"E91-DTU LBT Listen Before Talk and RSSI Monitoring Feature\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/5911\/1885\/files\/9_f46bd14f-f516-4f6d-9b73-bbb3bee56d51.jpg?v=1778846374\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"E91-DTU 30dBm vs 37dBm Transmission Power Comparison\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/5911\/1885\/files\/10_befabe30-a5bd-4e62-91c0-7623e5d79b15.jpg?v=1778846374\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"E91-DTU Long Range LoRa Communication Test and Coverage\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/5911\/1885\/files\/11_a5aae30f-9a8e-472c-9287-1d3d74751dbd.jpg?v=1778846374\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"E91-DTU Industrial IoT Deployment and System Architecture\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/5911\/1885\/files\/12_4107ec5d-b324-49c7-a15c-ecad91fb8feb.jpg?v=1778846374\"\u003e\u003c\/p\u003e\n\u003ch2 data-path-to-node=\"13\"\u003eApplication\u003c\/h2\u003e\n\u003cul data-path-to-node=\"14\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,0,0\"\u003e\u003cb data-path-to-node=\"14,0,0\" data-index-in-node=\"0\"\u003eOffshore Oil \u0026amp; Gas Extraction:\u003c\/b\u003e Utilizing the 37dBm (5W) high-power output, the E91-DTU overcomes signal attenuation caused by dense steel structures and multi-path interference on drilling platforms, ensuring stable telemetry data transmission over several kilometers without additional repeaters.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,1,0\"\u003e\u003cb data-path-to-node=\"14,1,0\" data-index-in-node=\"0\"\u003ePrecision Agriculture \u0026amp; Smart Irrigation:\u003c\/b\u003e With an IP67-rated flame-retardant housing and M12 waterproof connectors, the device is deployed in open fields to manage solenoid valves. The 30dBm LoRa modulation ensures reliable control signals penetrate through dense foliage and uneven terrain across large-scale plantations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,2,0\"\u003e\u003cb data-path-to-node=\"14,2,0\" data-index-in-node=\"0\"\u003eDistributed Photovoltaic (PV) Monitoring:\u003c\/b\u003e Integrated into solar farm inverters via the RS485 interface, the E91-DTU uses Modbus RTU transparency to transmit real-time voltage and current data to a central gateway. The built-in LBT (Listen Before Talk) functionality prevents data collisions in high-density sensor environments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/5911\/1885\/files\/16_adb22ec4-52c3-4c75-b4ba-5807046eed59.jpg?v=1778846374\" alt=\"E91-DTU LoRa RS485 DTU Application Scenarios - Oil Gas Agriculture Solar\"\u003e\u003c\/p\u003e\n\u003ch2 data-path-to-node=\"15\"\u003eFAQ\u003c\/h2\u003e\n\u003ch3 data-path-to-node=\"16\"\u003eQ: How does the power supply ripple affect the RF performance of the E91-DTU(400SL37)?\u003c\/h3\u003e\n\u003cp data-path-to-node=\"16\"\u003eA: For a 5W (37dBm) high-power transmitter, the instantaneous current can peak significantly during transmission. We recommend a power supply capable of delivering at least 2A with a ripple voltage below 100mV. Excessive ripple can lead to phase noise in the frequency synthesizer and potentially cause the LoRa spread spectrum signal to deviate from the center frequency, reducing the effective receiver sensitivity at the remote end.\u003c\/p\u003e\n\u003ch3 data-path-to-node=\"17\"\u003eQ: What is the significance of the 50-ohm impedance matching for the external antenna?\u003c\/h3\u003e\n\u003cp data-path-to-node=\"17\"\u003eA: The RF output stage of the E91-DTU is optimized for a 50-ohm characteristic impedance. If the connected antenna or coaxial cable has a high Voltage Standing Wave Ratio (VSWR \u0026gt; 1.5), a portion of the 30-37dBm power will be reflected back to the module as heat. This not only reduces the radiated power and communication range but also increases the thermal stress on the power amplifier (PA) transistor, potentially shortening the hardware lifespan.\u003c\/p\u003e\n\u003ch3 data-path-to-node=\"18\"\u003eQ: How does the Listen Before Talk (LBT) feature improve channel efficiency in industrial Modbus networks?\u003c\/h3\u003e\n\u003cp data-path-to-node=\"18\"\u003eA: LBT is a carrier sense mechanism where the E91-DTU monitors the RSSI level of the current channel before initiating a transmission. If the detected noise floor exceeds a predefined threshold (typically -80dBm), the module backsoff to avoid a packet collision. This is critical in Modbus networks where multiple nodes share the same frequency, as it significantly reduces the packet error rate (PER) caused by overlapping RF emissions.\u003c\/p\u003e\n\u003ch3 data-path-to-node=\"19\"\u003eQ: What are the logic level requirements for the RS485 interface on the E91-DTU?\u003c\/h3\u003e\n\u003cp data-path-to-node=\"19\"\u003eA: The device utilizes a standard RS485 differential signaling transceiver. It interprets a differential voltage (VA - VB) greater than +200mV as a logic high and less than -200mV as a logic low. The interface includes built-in ESD protection and high-level isolation, allowing it to interface directly with industrial PLC ports or SCADA systems without the need for external pull-up or pull-down resistors in most standard bus lengths.\u003c\/p\u003e","brand":"Ebyte Official Store - IoT Module Manufacturer","offers":[{"title":"E91-DTU(400SL30)","offer_id":48565736308941,"sku":"E91-DTU(400SL30)","price":34.11,"currency_code":"USD","in_stock":true},{"title":"E91-DTU(400SL37)","offer_id":48565736341709,"sku":"E91-DTU(400SL37)","price":104.95,"currency_code":"USD","in_stock":false},{"title":"E91-DTU(900SL30)","offer_id":48565736374477,"sku":"E91-DTU(900SL30)","price":34.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0615\/5911\/1885\/files\/3034a1133efe01daba919094b70c6310_9f3497f9-c9b3-4198-a03f-7d855c098f20.jpg?v=1778846335","url":"https:\/\/ebyteiot.com\/fr\/products\/e91-dtu-lora-rs485-wireless-modem-30-37dbm-ip67-modbus-ebyte","provider":"Ebyte Official Store - IoT Module Manufacturer","version":"1.0","type":"link"}