Industrial 5W LoRa Wireless Serial Module (230MHz)
The E22-230T37S is a professional-grade wireless serial port module (UART) utilizing the latest generation of LoRa spread spectrum technology. Operating in the 220.125–236.125MHz frequency band, it delivers a massive 5W (37dBm) transmission power, enabling reliable communication over distances up to 25km. Designed for industrial stability, it supports a wide voltage range of 4.5V-15V and includes relay networking capabilities.
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Mannual
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RF_Setting(E22-E9X(SL))+V3.3
Application Note
Technical Specifications
| Parameter | Value | Remarks |
|---|---|---|
| Carrier Frequency | 220.125～236.125 MHz | Supports ISM band |
| Transmission Power | 37 dBm (Approx. 5W) | Max 38 dBm |
| Communication Distance | 25 km | Open air, 5dBi antenna, 2.4kbps |
| Supply Voltage | 4.5V – 15V DC | ≥4.5V ensures full power output |
| Interface Type | UART (TTL Level) | 3.3V logic recommended |
| Air Data Rate | 0.3k – 62.5 kbps | User programmable |
| Receiving Sensitivity | -128 dBm | At 2.4 kbps air rate |
Why Choose E22-230T37S?
- Ultra-Long Range: Reaches up to 25km, perfect for rural IoT or long-distance telemetry.
- Industrial Stability: Features an industrial-grade design with an operating temperature of -40 to +85°C.
- Flexible Power: Supports 4.5V to 15V supply, compatible with various battery and industrial power systems.
- Advanced LoRa Solution: Built-in relay networking and multiple transmission modes (fixed-point, broadcast, etc.).
Application
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Smart Agriculture & Irrigation Control: Utilizing the 25km ultra-long-range capability to monitor soil moisture and control solenoid valves in large-scale farms where cellular coverage is unavailable.
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Industrial Oil & Gas Pipeline Monitoring: Leveraging the 37dBm high penetration power and the 230MHz lower frequency diffraction advantage to transmit pressure and flow data across rugged terrains and metal structures.
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Smart Grid & Power Line Monitoring: Employing the multi-level relay networking feature to extend signal coverage along high-voltage transmission lines, ensuring reliable data backhaul in high-interference environments.
FAQ
Q: Why is a level conversion circuit required when interfacing with a 5V MCU?
A: Although the module supports a wide supply voltage up to 15V, its UART communication interface operates at a 3.3V TTL logic level. Connecting a 5V MCU directly to the RXD pin can lead to excessive current injection through the internal ESD protection diodes, which poses a significant risk of permanent thermal damage to the SX1262 chip. Using a level shifter or a simple resistor-based voltage divider is essential to ensure signal integrity and hardware longevity.
Q: What are the power supply requirements to maintain a stable 37dBm output?
A: To reach the peak 5W transmission power, the power supply must be capable of providing at least 3.5A of instantaneous current at 5V. If the supply impedance is too high or the traces are too thin, the transient voltage drop during transmission will cause frequency pulling or power output degradation. It is recommended to place a high-quality 470uF or larger electrolytic capacitor near the VCC pin to buffer current spikes.
Q: How does the 230MHz frequency band compare to 433MHz in terms of diffraction?
A: The 230MHz band has a longer wavelength than the 433MHz band, which inherently provides better diffraction characteristics when encountering physical obstacles like buildings or hills. This allows the E22-230T37S to "bend" around obstacles more effectively, significantly reducing shadow fading and improving link reliability in non-line-of-sight industrial environments.
