The Ebyte E90-DTU(433L37)-V8 is a high-power 5W (37dBm) industrial LoRa wireless data transceiver based on the SX1278 RF chip, operating in the 410-441MHz band with transparent RS232/RS485 interfaces, FEC forward error correction, and a long transmission distance up to 20km.
| Technical Parameter | E90-DTU(433L37)-V8 Specification | Remarks / Details |
|---|---|---|
| RF Transceiver Chipset | Semtech SX1278 | High-performance LoRa spread spectrum engine |
| Operating Frequency Band | 410 MHz to 441 MHz | Sub-GHz ISM frequency band |
| Transmit Power | 37 dBm (5 Watts) | High power for ultra-long distance RF links |
| Communication Distance | 20 km | Tested in open line-of-sight environments |
| Hardware Interfaces | RS232 / RS485 (Transparent) | Direct connection to industrial PLCs and RTUs |
| Modulation & Features | LoRa Spectrum / FEC / Soft Decision | Built-in forward error correction for anti-interference |
| Product Weight | 240 +/- 5 grams | Rugged metal enclosure design |
| RF Parameter | Value | Remark |
|---|---|---|
| Working frequency | 410~441 MHz | Default: 433MHz |
| Transmitting power | 37 dBm | About 5W |
| Air data rate | 2.4k~19.2kbps | Default: 2.4kbps |
| Test distance | 20000 meters | In open and clear air, with maximum power, 5dBi antenna gain, height of 2m. |
| Hardware Parameter | Value | Remark |
|---|---|---|
| Size | 121 * 105 * 25 mm | Without interface |
| Antenna type | SMA-K | - |
| Communication interface | RS232 / RS485 | Standard DB9 Hole/3.81 connecting terminal |
| Baud rate | 9600 | Baud rate: 1200~115200 |
| Buffer | 512 bytes buffer | Automatically sub-packaging with 197 bytes per package |
| Electronic parameter | Min. | Typ. | Max. | Unit | Condition |
|---|---|---|---|---|---|
| Power supply | 10 | 12 | 28 | V | - |
| Transmitting current | 1024 | 1138 | 1252 | mA | 37dBm（5W） |
| Stand-by current | 45 | 50 | 55 | mA | - |
| Operating temperature | -40 | 20 | +85 | ℃ | - |
| Operating humidity | 10 | 60 | 90 | % | - |
| Storage temperature | -40 | 20 | +125 | ℃ | - |
Practical Application Scenarios
1. Long-Distance Smart Agriculture & Automated Irrigation Control
In sprawling agricultural estates, wiring cable lines to remote solenoid valves and soil moisture sensors across tens of kilometers is cost-prohibitive. The E90-DTU(433L37)-V8 acts as a wireless Modbus bridge between field PLCs and central controller units. Utilizing its high 37dBm transmit power and 20km transmission range in the 410-441MHz Sub-GHz band, it reliably penetrates dense crops and hilly terrain, ensuring telemetry frames and control commands transmit seamlessly without cellular data fees.
2. High-Voltage Power Grid Transmission Tower Environmental & Telemetry Monitoring
Power distribution lines across remote mountainous regions require real-time monitoring of tower vibration, insulator condition, and weather metrics. By interfacing field sensor acquisition hubs to the DTU's RS485 port, engineers establish a ultra-long-range wireless telemetry backbone. The embedded Forward Error Correction (FEC) and balanced soft-decision algorithms effectively eliminate electromagnetic noise and multi-path interference generated by high-voltage power lines.
3. Oil & Gas Pipeline Pressure Monitoring & Valve Telemetry
Pipeline infrastructure spanning remote geography needs continuous pressure, flow rate, and temperature tracking. The E90-DTU(433L37)-V8 interfaces via transparent RS232/RS485 with pipeline Flow Computers and Remote Terminal Units (RTUs). The 5W RF output ensures line-of-sight propagation up to 20km between relay stations, allowing SCADA host software to poll distant nodes and send shut-off commands without packet loss during extreme weather.
FAQ Section
1. What makes the 37dBm LoRa transmission different from traditional analog FM transceivers with MODEMs?
Traditional analog FM transceivers combined with MODEMs suffer from high noise sensitivity, low transmission range, and poor anti-interference. The E90-DTU(433L37)-V8 utilizes Semtech's SX1278 LoRa spread spectrum technology combined with digital modulation and Forward Error Correction (FEC). This delivers superior receiving sensitivity, higher anti-jamming performance, and reliable digital data transport over 20km.
2. Can the RS232 and RS485 interfaces on the E90-DTU(433L37)-V8 be used simultaneously?
The module provides both RS232 and RS485 physical interface terminals for installation flexibility. However, standard serial communication operating modes typically process data through one active serial interface at a time to prevent bus contention. You can wire your PLC or host device directly to either port using standard baud rate settings.
3. How does Forward Error Correction (FEC) benefit field data transmission?
The built-in FEC algorithm adds redundant error-correction coding bits to transmitted data packets. If a packet suffers burst interference during long-range wireless propagation, the receiving DTU automatically detects and corrects bit errors on the fly without requiring packet retransmission, maintaining robust communication stability over the 410-441MHz band.
