| Spec Category | Parameter Dimension | Technical Specifications (E90-DTU (400SL44)) |
| Core Hardware | Radio Station Type | High-power Wireless Digital Radio Station (DTU) |
| Core RF Technology | LoRa Spread Spectrum Modulation | |
| RF Specs | Frequency Range | 410.125 MHz to 493.125 MHz |
| Transmit Power | 25W (approx. 44 dBm) | |
| Max Range | 40 km (under optimal, open line-of-sight test conditions) | |
| Hardware Ports | Communication Interface | RS232 / RS485 (Transparent transmission) |
| RS485 Terminal | 3-pin terminal block | |
| RS232 Connector | DB9 female interface | |
| Physical Specs | Case Material | High-strength aluminum alloy industrial-grade housing |
| Dimensions | 160 mm x 137 mm x 44 mm | |
| Product Weight | 846.2 grams plus or minus 5 grams | |
| Industrial Grade | Installation | Wall-mount or DIN-rail installation compatible |
| Reliability | High-grade ESD protection, surge protection, and anti-interference |
| No. | Item | Value | Note |
|---|---|---|---|
| 1 | Size | 160*137*44mm | See chapter 3.Size for details |
| 2 | Weight | 846.2g | Weight tolerance 4.5g |
| 3 | Temperature | -40℃～+85℃ | Meet the needs of industrial grade use |
| 4 | Antenna impedance | 50Ω | Standard 50 Ω characteristic impedance |
| 5 | Supply voltage | 12V DC | Recommended to support instantaneous current 10A |
| 6 | Communication interface | RS232/RS485 | Standard DB9 hole / 5.08 terminal block |
| 7 | Baud rate | Factory default 9600 | Baud rate range 1200～115200 |
| 8 | Address code | Factory default 0 | 65536 configurable address codes |
Practical Application Scenarios
Scenario 1: Ultra-Long Range Oil & Gas Pipeline Monitoring
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Regional Industry Pain Points: Oil and gas pipelines in remote regions of the Middle East and North America stretch across dozens of kilometers of uninhabited deserts or rugged terrains. Standard cellular networks (4G/5G) lack coverage in these remote areas, and fiber-optic deployment is extremely expensive. SCADA systems must pull pressure, temperature, and leak-detection data from distributed valve stations back to the central control room reliably over extreme distances.
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Ebyte Technical Solution: The E90-DTU(400SL44) operates as a powerful long-range telemetry hub. Armed with a 25W RF output and LoRa spread spectrum algorithms, it penetrates topographical obstacles and easily establishes solid 40km point-to-point or point-to-multipoint wireless networks. It connects directly to the flow-meters and pressure transmitters via its RS485 interface, forwarding real-time Modbus register values back to the SCADA PLC without cellular network dependence.
Scenario 2: Smart Agricultural Irrigation & Dam Water Level Telemetry
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Regional Industry Pain Points: Large-scale commercial farms and water conservancy reservoirs require automated control over massive areas. Standard sub-GHz devices cannot cover the entire perimeter, and the presence of heavy crop canopies, trees, or surrounding hills causes severe multi-path fading that drops packet delivery rates on traditional RF transceivers.
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Ebyte Technical Solution: By integrating the E90-DTU(400SL44) at the water reservoir control center and distributing lower-power Ebyte LoRa modems at remote water gates and soil-moisture sensor clusters, operators create a reliable local network. The 25W DTU acts as the high-power master station, slicing through wet crop canopies and terrain obstacles over miles to command irrigation pumps and log water levels, providing zero-cost telemetry without monthly SIM-card fees.
Scenario 3: High-Interference Mountainous Wind Farm SCADA Communication
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Regional Industry Pain Points: Wind turbine farms are frequently built on high mountain ridges. High-voltage power generators, high-power transformers, and massive rotating metal blades generate strong electromagnetic fields and structural interference. Communication systems must bypass this severe local EMI to relay wind speed, turbine angle, and power generation metrics from isolated turbine towers back to the main substation.
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Ebyte Technical Solution: The E90-DTU(400SL44) uses LoRa's deep anti-jamming capabilities, which allow it to receive signals below the noise floor, shielding the transmission from intense local EMI. Its heavy-duty metal chassis acts as a Faraday shield against electrical noise. Engineers mount the DTU inside the base of the tower, connecting it directly to the turbine controller via RS232 or RS485, ensuring uninterrupted, real-time command routing over the entire wind-farm valley.
FAQ Section
Q1: What kind of power supply and antenna setup are required for this 25W high-power radio station?
A1: Because the E90-DTU(400SL44) features a high-power 25W transmitter, it requires a robust, stable external power supply capable of supplying high peak currents during transmissions. Make sure to use a high-quality DC power source that meets the voltage specs in the manual and is rated for at least 5A to 10A of peak current. For the antenna, you must use an industrial outdoor omni-directional or directional Yagi antenna matched to the 410 to 493 MHz frequency band, connected via high-quality, low-loss 50-ohm RF cables to prevent power reflection and potential damage to the RF front-end.
Q2: Can the RS232 and RS485 interfaces on the E90-DTU(400SL44) be used at the same time?
A2: No. The module is equipped with both DB9 female (RS232) and 3-pin terminal block (RS485) hardware connectors, but they share the same internal UART controller. This means you cannot transmit or receive data through both physical ports at the exact same instant. You must choose one physical interface depending on your field equipment's wiring requirements.
Q3: Why does the DTU feature 433MHz LoRa technology instead of standard FSK modulation?
A3: Standard FSK (Frequency Shift Keying) modulation relies heavily on raw signal strength and is easily blocked by physical obstacles or corrupted by nearby electromagnetic noise. LoRa modulation uses spread-spectrum technology, which offers superior receiver sensitivity (often below the noise floor) and remarkable anti-interference capabilities. This allows the E90-DTU(400SL44) to establish a continuous, error-free link over 40km at 25W, whereas an FSK-based radio at the same power would struggle at a fraction of that distance under real-world interference.
Q4: Is there any license requirement for using a 25W radio transceiver?
A4: Yes. In most countries and regions, a 25W transmitter is classified as high-power radio equipment. Unlike low-power micro-power wireless devices that operate on unlicensed ISM bands (such as 10mW or 100mW), operating a 25W transmitter on 410 to 493 MHz usually requires applying for a radio station license or operating on designated commercial frequencies approved by your local radio regulatory authority (such as the FCC in the US or CE/RED authorities in Europe). Please check your local radio frequency laws before transmitting.
