[Carrier frequency]：850.125～930.125MHz
[Transmission power]：33dBm
[Communication distance]：16km
[Interface type]： RS232/RS485
[Product size]： 82*62*25mm
[Introduction]：E90-DTU (900SL33) is a wireless data transmission radio using military-grade LoRa modulation technology. It has multiple transmission methods. The default working frequency band is 868.125MHz, and it supports 8-28V voltage input. The module has a software FEC forward error correction algorithm that can actively correct interfered data packets, greatly improving reliability and transmission distance. The radio station has the function of data encryption. The data transmitted by the radio station in the air is random. Through the strict encryption and decryption algorithm, the data interception is meaningless; it supports the setting of sub-packet length, and supports different real-time and data packets.
| Model | Frequency | Power | Distance | Specification | Recommend application scenarios |
| Hz | W | km | |||
| E90-DTU(900SL 33) | 868.125MH z | 2 | 16 | LoRa amplification of anti-interference | Suitable for distant, easily disturbed environments |
★ Note: In sunny weather, no shelter in the open environment. 12V / 2A power supply, 5 dBi suction cup antenna. the antenna is 2 meters away from the ground height, using the factory default parameters.
Frequency range and channel number
| Model | Default Frequency | Band Range | Channel Spacing | Description |
| Hz | Hz | Hz | ||
| E90-DTU(900SL33) | 868.125MHz | 850.125- 930.125MHz | IM | 81. Half duplex |
★ Note: In the same area, multiple sets of transmission stations are used to communicate one to one at the same time. It is sueeested that the channel interval be set above 2 MHz.
Transmit power level
| Model | 2W | 1W | 500m W | 250m W |
| E90-DTU(900SL33) | Factory default | √ | √ | √ |
★ Note: The lower the transmission power is, the closer the transmission distance is, but the working current will not decrease in the same proportion, so it is recommended to use the maximum transmission power.
Air rate grade
| Model | Default | Equal series | Air rate grade |
| bps | bps | ||
| E90-DTU(900SL33) | 2.4k | 6 | 2.4、4.8、9.6、19.2、38.4、62.5k |
★ Note: The higher the air speed setting, the faster the transmission rate, and the closer the transmission distance; so if the rate meets the usage requirements, the lower the air speed, the better.
Current parameters
| Model | Emission current mA | Waiting current mA | ||
| 12V | 24V | 12V | 24V | |
| E90-DTU(900SL33) | 650 | 330 | 10 | 6 |
Receiving length and subcontracting method
| Model | Cache size | Subcontracting method |
| E90-DTU(900SL33) | 1000 Bytes | Can be sent by instruction subcontracting 32 / 64 / 128 / 240 bytes |
★ Note: 1. If the single data received by the radio station is greater than the single package capacity, the excess part of the data will be automatically allocated to the second transmission until the transmission is completed;
2. The single received data should not be greater than the cache capacity.