The Ebyte E90-DTU(230SL22) is an industrial wireless data transceiver built on the Semtech SX1262 LoRa core, operating in the 220.125-236.125MHz frequency band with 22dBm output power, TCXO temperature compensation, transparent RS232/RS485 serial ports, and auto-relay multi-hop capability for reliable 5km long-range telemetry.
| Technical Parameter | E90-DTU(230SL22) Specification | Remarks / Details |
|---|---|---|
| RF Chipset / Modulation | Semtech SX1262 / New Generation LoRa | High sensitivity and interference immunity |
| Operating Frequency | 220.125 MHz to 236.125 MHz | Default 230.125 MHz, Sub-1GHz band |
| Transmitting Power | 22 dBm (approx. 160 mW) | Software adjustable via configuration software |
| Communication Distance | 5 km | Line-of-sight test in open field |
| Serial Interface | RS232 / RS485 Transparent Transmission | Standard DB9 and 3.5mm terminal block |
| Air Data Rate | 0.3 kbps to 15.6 kbps | Configurable air rate for link budget optimization |
| Operating Voltage | 8 V to 28 V DC | Industrial wide-voltage power input (12V/24V typical) |
| Frequency Stability | TCXO (Temperature Compensated Crystal Oscillator) | Ensures low frequency offset across industrial temp ranges |
| Advanced Features | Auto Networking / Relay Mode / RSSI Signal Output | Extends network coverage without extra controller logic |
| Weight & Dimensions | 128 plus/minus 5 grams | Rugged metal enclosure with DIN-rail mount options |
| RF Parameter | Value | Remark | |
|---|---|---|---|
| Working frequency | 220.125~236.125 MHz | Default: 230.125MHz | |
| Transmitting power | 22 dBm | About 160mW | |
| Air data rate | 0.3k~15.6kbps | Default: 2.4kbps | |
| Test distance | 5000 meter | - |
| Hardware Parameter | Value | Remark |
|---|---|---|
| Size | 82 * 62 * 25 mm | Without SMA-K |
| Antenna type | SMA-K | - |
| Communication interface | RS232 / RS485 | Standard DB9 Hole / 3.81 connecting terminal |
| Channel numbers | 65 | Half duplex |
| Buffer | 1000 bytes | Can be sub-packed to 32/64/128/240 byte each time via command |
| Electronic parameter Min. Typ. Max. Unit Condition | |||||
|---|---|---|---|---|---|
| Power supply | 8 | 12 | 28 | V | It is recommended to use 12V or 24V |
| Transmitting current | - | 46 | - | mA | 22dBm（160mW） |
| Stand-by current | - | 11 | - | mA | - |
| Operating temperature | -40 | 20 | +85 | ℃ | - |
| Operating humidity | 10 | 60 | 90 | % | - |
| Storage temperature | -40 | 20 | +125 | ℃ | - |
Practical Application Scenarios
1. Multi-Hop Agricultural Irrigation and Water Quality Monitoring Networks
In large-scale agricultural watersheds or river monitoring projects where physical obstacles block direct radio sight, the E90-DTU(230SL22) utilizes its built-in hardware auto-repeater feature. By configuring intermediate DTU nodes in relay mode, Modbus RTU telemetry signals from Ebyte MA01 Series Remote I/O modules connected to water pressure sensors and sluice gates can automatically hop across multiple nodes. This effectively doubles or triples the baseline 5km transmission distance without requiring complex relay routing code in field PLCs.
2. Smart Grid Secondary Substation and Distribution Line Telemetry
In urban or suburban power distribution networks, 220-236MHz is a dedicated radio frequency band widely used for power system automation. The E90-DTU(230SL22) connects to Feeder Terminal Units (FTUs) and Remote Terminal Units (RTUs) via standard RS485/RS232 serial ports. Equipped with a TCXO oscillator, the modem guarantees stable RF frequency precision and low packet error rates in severe outdoor temperature shifts and high electromagnetic noise environments typical of high-voltage transformers.
3. Industrial Solar Farm Inverter and Weather Station Centralization
Photovoltaic solar plants cover vast geographical areas where wiring RS485 communication cables underground is costly and vulnerable to lightning strikes. Deployed at string inverters and weather stations, the E90-DTU(230SL22) collects real-time generation metrics and solar irradiance data over transparent RS485 links. It transmits these packets over its 22dBm LoRa link directly to a central master DTU or gateway connected to the plant monitoring server, providing a cost-effective, wireless drop-in replacement for RS485 bus cabling.
FAQ Section
1. What advantages does the SX1262 chipset and TCXO integration offer over legacy SX1276 LoRa modems?
The SX1262 chipset used in the E90-DTU(230SL22) delivers significantly higher power efficiency and better receiver sensitivity compared to previous-generation SX1276 transceivers. Additionally, the built-in TCXO (Temperature Compensated Crystal Oscillator) keeps frequency drift under tight limits across wide temperature fluctuations, making the 220-236MHz signal lock rock-solid for long-term outdoor industrial installations.
2. How does the Automatic Repeater (Auto Relay) function work on the E90-DTU(230SL22)?
The auto-repeater feature allows a single E90-DTU(230SL22) modem to act as a multi-hop relay. By setting the node address and target address in the configuration software, the modem automatically receives packets from a source node and re-transmits them to a destination node that is beyond the direct 5km range, seamlessly extending total network distance without requiring additional microcontroller routing logic.
3. What power supply and wiring considerations should be noted for RS232 and RS485 field connections?
The E90-DTU(230SL22) supports a wide voltage supply range of 8V to 28V DC, making it directly compatible with standard 12V or 24V DC industrial power buses. For serial wiring, the device offers both DB9 for RS232 and terminal blocks for RS485. When connecting via RS485 over longer cable runs, ensure proper A/B polarity matching and consider adding a 120-ohm terminal resistor at the farthest node to prevent signal reflections.
