The Ebyte E22-400T37S is a professional-grade, long-range LoRa wireless serial port module based on Semtech's LoRa spread spectrum technology, operating in the 410.125–493.125MHz frequency band with a high-power 37dBm (5W) output and 25km communication distance, supporting wide-range 4.5V–15V power input for robust industrial relay networking applications.
| Parameter | Specification |
|---|---|
| RF Solution | Semtech LoRa |
| Frequency Range | 410.125 to 493.125 MHz |
| Transmit Power | 37 dBm (5W) |
| Communication Distance | 25 km |
| Operating Voltage | 4.5V to 15V |
| Interface Type | UART (TTL) |
| Dimensions | 50 x 30.9 mm |
| Weight | 10.3 grams |
Main Parameter Performance
| Main Parameter | Minimum | Typical Value | Maximum | Remark | |
|---|---|---|---|---|---|
| Operating Voltage (V) | 4.5 | 5~12 | 15 | ≥4.5V guarantees output power; the lower the voltage, the greater the supply current. | |
| Communication Level (V) | - | 3.3 | - | Using 5V levels may pose a risk of burnout, requiring level shifting circuitry. | |
| Operating Temperature (°C) | -40 | - | 85 | Industrial-grade design | |
| Operating Frequency Band (MHz) | 410.125 | - | 493.125 | ISM bands are supported | |
| Power Consumption | 5V Transmit Current (mA) | 2900 | 3100 | 3300 | Test at 50 ohms impedance. Use 5V supply; please provide at least 3.5A output power supply. |
| 12V Transmit Current (mA) | 900 | 1100 | 1300 | Test at 50 ohms impedance. Use 12V supply; please provide at least 1.5A output power supply. | |
| Receive Current (mA) | 11 | 43 | 15 | - | |
| Sleep Current (uA) | - | 2 | - | Software shutdown | |
| Maximum Transmit Power (dBm) | 36 | 37 | 38 | - | |
| Receive Sensitivity (dBm) | -126 | -128 | -130 | Air rate 2.4 kbps | |
| Air Rate (bps) | 0.3k | 2.4k | 62.5k | User programmatic control | |
| Reference Distance | 20km | Clear sky, Chengdu downtown, antenna gain 5dBi, antenna height 2.5 meters, airspeed 2.4K. | |||
| Emission Length | 240 Byte | Subpackets can be sent by command setting 32/64/128/240 byte. | |||
| Cache Capacity | 1000 Byte | - | |||
| Modulation Mode | LoRa | A new generation of LoRa modulation technology | |||
| Communication Interface | UART Serial Port | TTL level | |||
| Encapsulation Method | SMD | SMD | |||
| Interface Mode | 2.54mm | - | |||
| Form Factor | 50*30.9mm | - | |||
| RF Interface | IPEX / Stamp Hole | The characteristic impedance is about 50 ohms | |||
Product Features & Scenarios
Practical Application Scenarios
1. Large-Scale Agricultural Irrigation Automation
In expansive, open-field farming, this module serves as the primary communication link for automated water distribution systems. The 5W high output power ensures stable command delivery to solenoid valves and pumps located kilometers apart, effectively bypassing terrain obstacles and eliminating the high cost of laying physical cables across thousands of acres.
2. Mining and Tunnel Asset Monitoring
The E22-400T37S excels in underground and harsh industrial environments where signal penetration is critical. By deploying these modules, safety sensors and gas detection equipment can transmit real-time telemetry data through complex concrete and rock structures to a surface gateway, ensuring worker safety and equipment health in subterranean mine shafts.
3. Utility Grid and Distribution Automation
For power distribution networks covering rural regions, this module supports remote reading of smart meters and fault monitoring of distribution line reclosers. Its capability to operate in relay network modes allows utility providers to extend coverage over long distances, providing a cost-effective, wireless alternative to cellular connectivity where base station coverage is sparse.
FAQ Section
1. Does the 5W output require special heat dissipation or power supply consideration?
Yes, the 37dBm high-power transmission creates a significant transient current load. It is mandatory to use a high-stability power source (up to 15V) with sufficient current capacity (at least 2A recommended) to prevent voltage drops during transmission bursts. Additionally, we strongly advise mounting the module on a heat-conductive surface or a PCB area with sufficient copper pouring to assist in thermal dissipation during continuous transmission.
2. Can this module be configured for multi-hop relay networking?
Yes, the E22 series supports relay mode, which allows for point-to-point and point-to-multipoint transparent transmission. By configuring modules as repeaters, you can significantly extend the 25km range, creating a chain of nodes that effectively covers areas with high topographical interference or extreme distance requirements.
3. How does this module interface with industrial-standard RS485 systems?
The E22-400T37S utilizes a standard TTL UART interface. To interface with RS485 equipment, such as industrial PLC or Modbus devices, you will need to add a standard TTL-to-RS485 transceiver chip (like the MAX485). Connecting the module via this conversion circuit allows it to seamlessly integrate into existing industrial fieldbus architectures.
