E90-DTU(900SL42)LoRa data transmission radio LoRa module remote communication SX1262 radio frequency chip 485/232 wireless data transmission radio relay network
[Introduction]：E90-DTU(900SL42) is a truly high-quality industrial-grade wireless data transmission radio. The radio uses LORA spread spectrum technology. Its strong anti-interference ability makes wireless communications more stable and reliable in industrial sites. It has a variety of transmission methods and works in the (850.125~930.125MHz) frequency band (default 868MHz). The radio station provides a transparent RS232/RS485 interface. LoRa direct sequence spread spectrum technology will bring longer communication distance and has the advantage of strong anti-interference ability. The module has a software FEC forward error correction algorithm, which has high coding efficiency and strong error correction capability, which greatly improves reliability and transmission distance. The radio has data encryption function; supports sub-packet length setting, supports different real-time and data packets.
| Model specifications | Operating frequency (Hz) | Transmitting power (W) | Reference distance (km) | Specifications and features | Recommended application scenarios |
| E90-DTU(900SL42) | 868.125M | 15 | 30 | LoRa spread spectrum anti-interference | Suitable for environments with long distances and susceptible to interference |
Note: Sunny weather, open environment without obstruction, 12V/4A power supply, 5dBi suction cup antenna, the antenna is 2 meters above the ground, and the factory default parameters are used.
| No. | Item | Specification | Description |
| 1 | Product Size | 124*109.1*35.2mm | See installation dimensions for details |
| 2 | product weight | 425g | Weight tolerance 5g |
| 3 | Operating temperature | -40℃～+85℃ | Meet industrial grade use requirements |
| 4 | Antenna impedance | 50Ω | Standard 50Ω characteristic impedance |
| 5 | voltage range | 12±1V DC | It is recommended to support instantaneous current 4A |
| 6 | Communication Interface | RS232/RS485 | Standard DB9 female/5.08 terminal block |
| 7 | baud rate | Factory default 9600 | Baud rate range 1200～115200 |
| 8 | address code | Factory default 0 | A total of 65536 address codes can be set |
Frequency range and number of channels
| Model specifications | Default frequency (Hz) | Frequency band range (Hz) | Channel spacing (Hz) | Number of channels |
| E90-DTU(900SL42) | 868.125M | 850.125～930.125M | 1M | 81, half duplex |
Note: When using multiple groups of digital radio stations to communicate one-to-one at the same time in the same area, it is recommended that each group of digital radio stations set a channel spacing of more than 2MHz.
Transmit power level
| Model specifications | 10/15 W |
| E90-DTU(900SL42) | Software adjustable, default 15W |
Air speed class
| Model specifications | Default air rate (bps) | Number of levels | Air rate level (kbps) |
| E90-DTU(900SL42) | 2.4k | 8 | 0.3、1.2、2.4、4.8、9.6、19.2、38.4、62.5 |
Note: The higher the air speed setting, the faster the transmission rate and the shorter the transmission distance; therefore, when the speed meets the usage requirements, it is recommended that the lower the air speed, the better.
Current parameters
| Model specifications | Power supply voltage (V) | Emission current (A) | Waiting current (mA) |
| E90-DTU(900SL42) | 12±1 | 2.5~3.5 | 30 |
Transmitting and receiving length and packetization method
| Model specifications | Cache size | Packaging method |
| E90-DTU(900SL42) | 1000 bytes | Subpackage 32/64/128/240 bytes can be set by command to send |
Note: 1. If the data received by the radio in a single time is greater than the single packet capacity, the excess data will be automatically allocated to the second transmission until the transmission is completed;
2. The data received by the radio station at a time cannot be larger than the buffer capacity.