1. 서론
The E90-DTU(433L37) is a robust wireless data transceiver designed for reliable long-distance communication. It integrates digital data processing, modulation, demodulation, and error correction functionalities. Unlike analog FM transceivers, it offers a transparent RS232/RS485 interface for seamless integration with various devices. Operating in the 433MHz frequency band, this module incorporates advanced ultra-narrow band modulation technology, along with built-in power amplifiers (PA) and low noise amplifiers (LNA), to achieve a maximum transmitting power of 5W and significantly improved receiving sensitivity. This design ensures enhanced communication stability and a remarkable communication distance of up to 20km, making it ideal for applications requiring real-time and reliable data transmission in diverse and complex geographical environments.
2. 주요 특징
- Advanced LoRa Modulation: Utilizes military-grade LoRa spread spectrum technology for significantly enhanced communication distance and stability.
- 고성능 출력: Transmission power up to 5W, with multi-level adjustable settings, meeting European industrial standards.
- Wide Interface Support: Provides transparent RS232 and RS485 interfaces for versatile connectivity.
- 견고한 디자인: Features an all-aluminum alloy shell for compact size, easy installation, good heat dissipation, and strong anti-interference ability.
- 종합 보호: Includes power reverse connection protection, over-connection protection, and antenna surge protection.
- 유연한 구성: Powerful software functions allow all parameters (power, frequency, air speed, address ID, etc.) to be set through programming.
- 낮은 전력 소모: Standby current is only 50mA (even lower in power saving and sleep modes), with an emission current of 1.2A.
- 높은 신뢰성: Built-in watchdog and accurate time layout ensure automatic module restart and continued operation with previous settings in case of exceptions.
- 온도 보상: Temperature compensators ensure frequency stability better than ±1.5PPM.
- Modbus Adaptation: Supports large single packages up to 197 bytes and Modbus adaptation.
- 유연한 전원 공급 장치: Simple and efficient power supply design, supporting 10~28V power supply from various devices or line pressure modes.
3. 제품 오버view
3.1. 장치 모양
그림 3.1: 전면 view of the E90-DTU(433L37) Wireless Transceiver, showing RS232, RS485, power input, and antenna connector.
3.2. 치수
Figure 3.2: Dimensions of the E90-DTU(433L37) module, approximately 102mm by 79mm.
3.3. 하드웨어 구성 요소
그림 3.3: 상세 view of hardware components including Antenna Interface, Dip Switch (M0, M1), Power Interface (DC-IN), Function Indicators (PWR, TXD, RXD), RS485 terminals (485_A, 485_B, GND, VCC), and RS232 port.
4. Basic Functionality and Connectivity
The E90-DTU(433L37) acts as a wireless data transceiver, enabling communication between devices without the need for physical serial cables. It supports both RS232 and RS485 interfaces, providing a flexible solution for various data transmission needs.
Figure 4.1: Diagram illustrating the basic function of the E90-DTU, showing wireless data transmission between a PC and a serial device via two DTU modules.
This module facilitates wireless data transmission and reception, effectively replacing traditional serial cable connections. It can connect to a PC or other serial devices via its RS232 or RS485 ports, allowing for seamless data exchange over a wireless link.
5. 설정 및 설치
5.1. 전원 연결
Connect the power supply to the DC-IN port. The module supports a wide input voltage range of 10V to 28V. Ensure correct polarity (+ and -) as indicated on the device to prevent damage.
5.2. 안테나 연결
Attach the appropriate 433MHz antenna to the ANT connector. Ensure the antenna is securely fastened to guarantee optimal signal transmission and reception performance.
5.3. Serial Interface Connection
- RS232 : Connect your RS232 compatible device (e.g., PC, PLC) to the DB9 serial port on the E90-DTU.
- RS485 : Connect your RS485 compatible device to the 485_A and 485_B terminals. Pay close attention to proper A/B wiring for correct differential signaling.
5.4. 딥 스위치 구성
The module features M0 and M1 dip switches, which are used to configure various operating modes. These modes determine how the module functions (e.g., transparent transmission, configuration mode). Refer to the detailed technical manual for specific mode configurations and their corresponding dip switch settings.
6. 사용 설명서
6.1. 전원 켜기
Once all necessary connections (power, antenna, serial interface) are securely established, apply power to the E90-DTU module. The PWR indicator LED will illuminate, indicating that the device is powered on.
6.2. 데이터 전송
In transparent transmission mode, data sent to the RS232 or RS485 port of one E90-DTU module will be wirelessly transmitted and subsequently output from the corresponding serial port of the paired module. The TXD (transmit) and RXD (receive) indicator LEDs will flash during active data transmission and reception, respectively, providing visual feedback on communication status.
6.3. 구성 소프트웨어
The E90-DTU supports configuration and management via dedicated software, which is typically available for download from the manufacturer's official website. This software provides a user-friendly interface to set various operational parameters such as power output, operating frequency, air speed, and address ID. The device status can also be conveniently monitored through the indicator lights.
Figure 6.1: Screenshot of the Function Configuration Software, available for download from the official website, used to manage module parameters.
For advanced networking, the module also supports Modbus TCP to RTU conversion and various gateway modes, including active upload mode, multi-host gateway mode, stored gateway mode, and configurable gateway mode, offering flexibility for complex system integrations.
비디오 6.1: 오버view video demonstrating the E90-DTU(433L37) Wireless Transceiver, including unboxing, physical features, and basic connectivity concepts. This video highlights the device's interfaces and general appearance.
7. 응용 프로그램
The E90-DTU(433L37) is a versatile wireless data transceiver suitable for a wide range of applications that require reliable and long-distance wireless data transmission:
Figure 7.1: Visual representation of various applications for the E90-DTU, including Smart Home, Agricultural Applications, Intelligent Warehouse, Industrial Applications, Device Management, and Wireless Data collection.
- 똑똑한 집: Ideal for wireless control and data exchange within home automation systems, enabling seamless communication between smart devices.
- Agricultural Applications: Used for monitoring and control of agricultural equipment and sensors over extensive areas, such as tracking soil moisture, weather conditions, or irrigation systems.
- Intelligent Warehouse: Facilitates data collection from sensors and devices within large warehouse environments, optimizing inventory management and logistics.
- 산업용 응용 분야: Provides reliable data transmission for Programmable Logic Controllers (PLCs), Remote Terminal Units (RTUs), and other industrial control systems, crucial for automation and process control.
- 장치 관리: Enables centralized management and monitoring of distributed devices, simplifying oversight and maintenance across various locations.
- Wireless Data: Serves as a general-purpose wireless data link in scenarios where wired connections are impractical or costly, offering flexibility and ease of deployment.
8. 유지관리
To ensure the longevity and optimal performance of your E90-DTU(433L37) Wireless Transceiver, follow these maintenance guidelines:
- 청결: 기기를 깨끗하게 유지하고 먼지나 이물질이 없도록 하세요. 청소 시에는 부드럽고 마른 천을 사용하세요.
- 통풍: Ensure proper ventilation around the device to prevent overheating, especially during continuous operation.
- 환경 조건: Avoid exposing the device to extreme temperatures, high humidity, direct sunlight, or corrosive environments.
- 연결 무결성: Regularly inspect all cable connections (power, serial, antenna) to ensure they are secure and free from damage.
- 서비스: Do not attempt to open, disassemble, or repair the device yourself. Refer all servicing to qualified technical personnel to avoid voiding the warranty or causing further damage.
9. 문제 해결
This section provides solutions to common issues you might encounter with the E90-DTU(433L37) Wireless Transceiver.
| 문제 | 가능한 원인 | 해결책 |
|---|---|---|
| 전원 없음(PWR LED 꺼짐) | 잘못된 전원 공급 장치 볼륨tage or polarity; loose power connection; faulty power adapter. | 전원 공급 볼륨을 확인하세요tage is within the 10-28V range. Check power cable connections for secure fit and correct polarity. Test with a known good power adapter. |
| No Data Transmission/Reception | Incorrect serial port settings (baud rate, parity, data bits, stop bits); antenna not connected or faulty; modules not paired or out of range; incorrect M0/M1 dip switch settings; interference. | Ensure serial port settings on connected devices match the module's configuration. Confirm antenna is securely connected and undamaged. Verify modules are within operational range and configured correctly (M0/M1 switches for operating mode). Check for sources of RF interference. |
| Intermittent Connection or Poor Range | Environmental interference; weak signal due to obstacles; loose antenna connection; antenna not optimized for frequency. | Relocate modules to minimize interference. Ensure clear line of sight between modules if possible. Check antenna connection and ensure it is appropriate for the 433MHz band. Consider using higher gain antennas or external antennas if needed. |
| Module Not Responding to Configuration Software | Incorrect serial port selected in software; module not in configuration mode; driver issues. | Ensure the correct COM port is selected in the software. Check M0/M1 dip switch settings to ensure the module is in configuration mode (if applicable for your software version). Install or update necessary USB-to-serial drivers. |
10. 사양
- 모델: E90-DTU(433L37)
- 주파수 범위: 410~441MHz
- 전송 전력: 37dBm (5W)
- 통신 거리: Up to 20km (line of sight, ideal conditions)
- 인터페이스: RS232 (DB9), RS485 (terminal block)
- 변조 기술: LoRa 확산 스펙트럼
- 전원 공급 장치tage: 10V ~ 28V DC
- 대기 전류: 약 50mA
- 방출 전류: Approximately 1.2A
- 주파수 안정성: Better than ±1.5PPM (with temperature compensation)
- 데이터 속도: 1.2k ~ 70kbps (air data rate)
- 작동 온도: Industrial standard (specific range not provided, but designed for robust environments)
- 치수: Approximately 102mm x 79mm (refer to Figure 3.2 for visual representation)
- 하우징 소재: 모든 알루미늄 합금
11. 보증 및 지원
EBYTE products are engineered for high reliability and performance. For comprehensive technical assistance, access to detailed documentation, and software downloads, please visit the official EBYTE web대지.
Official Technical Manual Support Link: http://www.ebyte.com/en/product-view-news.aspx?id=419
The E90-DTU has undergone rigorous testing and has obtained various important certifications, including the CE certificate (mandatory EU certification), FCC certificate, RoHS certificate (mandatory EU environmental protection certification), radio transmission equipment model approval certificate, explosion-proof certificate, electrostatic surge detection report issued by China testing institute, appearance design patent certificate, and utility model patent certificate. These certifications underscore the product's quality, safety, and compliance with international standards.
