E820-DTU(2I2-433L)-V8 is a remote-controlling device supporting analog quantity following, controlling, and collecting. Under controlling and collecting mode, it supports Modbus RTU protocol. This product features easy-to-use, and it can be integrated into user systems so as to realize remote wireless controlling via 433MHz band.
[Acquisition Type]： Analog
[Acquisition range]： 4~20mA
[Interface type]： RS485
[Number of acquisition channels]： 2 channels
[Product weight]： 242±5g
| RF Parameter | Index | Remark |
|---|---|---|
| Standard band | 433MHz | - |
| TX power | 30 dBm | Max. Power (1W) |
| Hardware Parameter | Index | Remark |
|---|---|---|
| Size (H*W*D) | 124*105*25 mm | - |
| Weight | 138±2 g | - |
| Operation temperature | -20℃ -+70℃ | - |
| Storage temperature | -40℃ -+85℃ | - |
| Operation humidity | 5% ~ 95% | - |
| Storage humidity | 1% ~ 95% | - |
| Operation voltage | 8V ~ 28V | - |
| Current collecting range | 0mA ~ 20mA | - |
| Current output range | 0mA ~ 20mA | - |
| Precision | 0.2% | - |
| Data interface | RS485:9600bps | - |
| Software parameters | Index |
|---|---|
| Operation mode | Following TX, Following RX, Controlling & Collecting, Configuration |
| Configuration command | Modbus RTU |
Practical Application Scenarios
1. Smart Industrial Liquid Level Monitoring
In chemical storage or wastewater treatment facilities, this device connects directly to pressure-based level transmitters outputting 4-20mA signals. By establishing a wireless link to the control room, it eliminates the need for expensive long-distance shielded cabling, providing real-time level monitoring that triggers automated pump controls via the Modbus protocol.
2. HVAC System Environmental Balancing
For large-scale commercial HVAC systems, this RTU collects data from airflow pressure and temperature sensors across different building zones. The 433MHz wireless band ensures superior signal penetration through concrete walls, allowing building management systems to dynamically adjust blower speeds and maintain optimal environmental conditions without re-wiring existing infrastructure.
3. Remote Meteorological and Soil Data Logging
Used in precision agriculture, the DTU serves as the interface between soil tension sensors and remote gateways. Its ability to perform analog quantity following allows for precise, real-time irrigation adjustments. When paired with an Ebyte solar-powered energy module, it provides a completely autonomous, maintenance-free data collection solution for vast, remote farmland.
FAQ Section
1. Can this device work with existing Modbus Master systems?
Yes, the E820-DTU(2I2-433L)-V8 fully supports the standard Modbus RTU protocol. It acts as a slave device that your existing PLC or SCADA master can poll directly, ensuring a frictionless integration into your existing industrial automation environment.
2. How does the "analog quantity following" feature function?
This feature allows the RTU to monitor an analog input and trigger a corresponding action on a paired control device. It is designed to perform localized automation tasks—like proportional valve control based on sensor feedback—independently of the primary network, reducing latency for time-critical industrial processes.
3. Is external antenna selection critical for this 433MHz device?
Yes, for maximum range and signal stability, choosing the appropriate 433MHz antenna is recommended based on your specific deployment environment. Whether installing in a metal cabinet or an open field, proper antenna impedance matching and positioning are essential to ensure a reliable link budget for long-range data collection.
