1. Product Overview
The E90-DTU-433L30 is a high-performance wireless data transceiver designed for reliable long-range communication. Operating within the 410-441MHz frequency range with a power output of 30dBm, it can achieve communication distances up to 8.0km. This device integrates digital data processing, modulation, demodulation, and error correction (FEC) to provide a transparent RS232/RS485 interface, distinguishing it from traditional analog FM transceivers.
Figure 1: Front view of the E90-DTU-433L30 Wireless Transceiver, showing RS232, RS485, GND, VCC ports, PWR, TXD, RXD indicators, M0, M1 pins, DC-IN, and antenna connector.
2. Key Features
- Advanced LoRa Modulation: Utilizes military-grade LoRa modulation technology for enhanced communication distance and stability.
- High Power Output: Transmission power up to 1W, with multi-level adjustable settings, meeting European industrial standards.
- Wide Interface Support: Provides transparent RS232 and RS485 interfaces for versatile connectivity.
- Robust Design: All-aluminum alloy shell for compact size, easy installation, good heat dissipation, and excellent electromagnetic compatibility.
- Enhanced Reliability: Features power reverse connection protection, over-connection protection, and antenna surge protection.
- Flexible Power Supply: Supports 10-28V power supply, compatible with various power devices or line pressure modes.
- Precise Frequency Stability: Incorporates temperature compensators for frequency stability better than ±1.5PPM.
- Configurable Parameters: All parameters such as power, frequency, air speed, and address ID can be set via programming software.
- Low Power Consumption: Standby current is only 21mA (even lower in power-saving and sleep modes).
- Built-in Watchdog: Ensures automatic module restart in case of exceptions, maintaining continuous operation with previous settings.
3. Hardware Overview
The E90-DTU-433L30 features clearly labeled interfaces and indicators for easy setup and monitoring.
Figure 2: Detailed view of the transceiver's hardware components, including Antenna Interface, Dip Switch, Power Interface, Function Indicators (PWR, TXD, RXD), RS485 terminals, and RS232 port.
- Antenna Interface: SMA-K connector for external antenna connection.
- Dip Switch (M0, M1): Used to set the module's operating mode (e.g., normal, wake-up, power-saving, configuration).
- Power Interface (DC-IN): Input for 10-28V DC power supply.
- Function Indicators:
- PWR: Power indicator.
- TXD: Transmit data indicator.
- RXD: Receive data indicator.
- RS485 Interface: Screw terminals for RS485_A, RS485_B, GND, and VCC connections.
- RS232 Interface: DB9 serial port for RS232 communication.
4. Setup and Basic Function
The E90-DTU-433L30 facilitates transparent data transmission between devices using RS232 or RS485 interfaces.
Figure 3: Diagram illustrating typical connections: a PC connected to one DTU via RS232/RS485, and another DTU connected to a serial device via RS232/RS485, communicating wirelessly.
4.1. Initial Setup
- Connect Antenna: Securely attach the 433MHz antenna to the SMA-K connector.
- Power Connection: Connect a 10-28V DC power supply to the DC-IN port. Ensure correct polarity.
- Data Interface Connection:
- For RS232: Connect your device (e.g., PC) to the DB9 RS232 port using a serial cable.
- For RS485: Connect your device to the RS485_A and RS485_B terminals. Ensure proper A/B wiring.
- Mode Configuration: Set the M0 and M1 dip switches according to your desired operating mode (e.g., transparent transmission, configuration mode). Refer to the detailed technical manual for specific mode settings.
4.2. Software Configuration
The E90-DTU-433L30 supports software configuration for various parameters, including frequency, air speed, and address ID.
Figure 4: Example interface of the Function Configuration Software, available for download from the official website.
It is recommended to download and use the official configuration software to customize the module's settings to match your application requirements. This software allows for precise control over the transceiver's operational parameters.
5. Operation
Once properly configured and connected, the E90-DTU-433L30 operates as a transparent data link. Data sent to its RS232 or RS485 port will be wirelessly transmitted to a paired E90-DTU module, and vice-versa.
- Data Transmission: When data is received on the serial input (RS232/RS485), the module automatically modulates and transmits it wirelessly. The TXD indicator will flash.
- Data Reception: Upon receiving wireless data, the module demodulates it and outputs it through the serial interface. The RXD indicator will flash.
- Mode Management: Ensure both transmitting and receiving modules are set to compatible operating modes (e.g., transparent transmission mode) for seamless communication.
6. Technical Specifications
| Specification | Value |
|---|---|
| ASIN | B07R51G2CD |
| Item model number | RS232 |
| Brand | EBYTE |
| Total Ethernet Ports | 2 |
| Number of Ports | 2 |
| Maximum Upstream Data Transfer Rate | 433 MHz |
| Modem Type | Digital |
| Manufacturer | EBYTE |
| Date First Available | September 27, 2021 |
Figure 5: Physical dimensions of the E90-DTU-433L30 module, approximately 82mm in length and 62mm in width.
7. Typical Applications
The E90-DTU-433L30 is suitable for a wide range of applications requiring reliable wireless data transmission.
Figure 6: Examples of application environments: Smart home, Agricultural application, Intelligent warehouse, Industrial applications, Device management, and general Wireless data transmission.
- Smart Home Systems
- Agricultural Monitoring and Control
- Intelligent Warehouse Management
- Industrial Automation and Control
- Remote Device Management
- General Wireless Data Transmission
8. Maintenance
To ensure the longevity and optimal performance of your E90-DTU-433L30 transceiver, follow these maintenance guidelines:
- Keep Clean: Regularly clean the exterior of the module with a soft, dry cloth. Avoid using harsh chemicals or abrasive materials.
- Environmental Conditions: Operate the module within its specified temperature and humidity ranges. Avoid exposure to extreme temperatures, direct sunlight, or high moisture.
- Secure Connections: Periodically check all cable connections (power, serial, antenna) to ensure they are secure and free from damage.
- Firmware Updates: Check the manufacturer's website for any available firmware updates that may improve performance or address issues.
- Proper Handling: Handle the module with care to prevent physical damage. Avoid dropping or subjecting it to strong vibrations.
9. Troubleshooting
If you encounter issues with your E90-DTU-433L30, consider the following troubleshooting steps:
- No Power:
- Verify the power supply voltage is within the 10-28V DC range.
- Check power cable connections and ensure they are secure and correctly polarized.
- Confirm the power outlet or source is functional.
- No Communication:
- Ensure both transmitting and receiving modules are powered on and their PWR indicators are lit.
- Check serial cable connections (RS232/RS485) for proper wiring and secure fit.
- Verify that the M0 and M1 dip switch settings on both modules are identical and configured for the desired operating mode (e.g., transparent transmission).
- Confirm that the frequency, air speed, and address ID settings are consistent across all communicating modules using the configuration software.
- Check antenna connections and ensure antennas are properly installed and not obstructed.
- Reduce the distance between modules or remove obstacles if communication range is an issue.
- Intermittent Communication:
- Check for sources of electromagnetic interference (EMI) near the modules.
- Ensure the power supply is stable and free from fluctuations.
- Verify antenna integrity and placement.
- Module Not Responding to Software:
- Ensure the module is in configuration mode (check M0/M1 settings).
- Verify the correct COM port is selected in the software.
- Check the serial cable and drivers on your computer.
10. Support and Resources
For detailed technical documentation, software downloads, and further support, please refer to the official EBYTE resources:
- Technical Manual Support: http://www.ebyte.com/en/product-view-news.aspx?id=418
- Manufacturer: EBYTE
- Official Website: Visit the EBYTE official website for the latest product information, drivers, and software.
11. Warranty Information
Specific warranty terms and conditions for the E90-DTU-433L30 Wireless Transceiver are typically provided at the point of purchase or can be found on the official EBYTE website. Please retain your proof of purchase for any warranty claims. For detailed warranty policy, please consult the manufacturer's official documentation or contact EBYTE customer support directly.
