EBYTE E220-900T22S LoRa Wireless Serial Port Module User Manual

1. Product Overview

The EBYTE E220-900T22S is a cutting-edge LoRa wireless serial port module, engineered with Semtech's LLCC68 chip. This module offers significant advantages in terms of low power consumption, high-speed data transfer, and extended communication range. It operates within the 850.125MHz to 930.125MHz frequency band, with a default setting of 868.125MHz, and provides TTL level output compatible with both 3.3V and 5V IO port voltages.

Key features include a maximum transmit power of 22 dBm, software-adjustable multi-level power settings, and an impressive communication distance of up to 5 kilometers under ideal conditions. The module supports user-defined communication keys for enhanced data confidentiality, RSSI signal strength indication for network evaluation and ranging, and an air wakeup function for ultra-low power applications. It also facilitates fixed-point and broadcast transmissions, channel monitoring, and features an efficient watchdog design for automatic restart in case of exceptions.

Figure 1: Front view of the EBYTE E220-900T22S LoRa module, showing its compact design and regulatory markings.

Figure 2: The EBYTE E220-900T22S module with its dimensions, measuring 16mm by 26mm.

2. Specifications

3. Setup and Installation

Proper setup is crucial for optimal performance of the E220-900T22S module. This section outlines general guidelines for integrating the module into your system.

3.1 Power Supply

• The module requires a power supply between 2.3V and 5.5V. For best performance, a 5V power supply is recommended.
• Ensure the power supply is stable and capable of providing sufficient current, especially during transmission peaks.

3.2 Pin Connections

Connect the module's pins to your microcontroller or host system according to the module's datasheet. The module provides TTL level output, making it compatible with common microcontrollers. Typical connections include VCC (power), GND (ground), TX (transmit), RX (receive), and potentially auxiliary pins for configuration or control.

3.3 Antenna Connection

The module supports dual antenna options (IPEX/stamp hole). Connect a suitable 868MHz or 915MHz antenna to the module. Ensure the antenna is correctly matched to the module's impedance for efficient signal transmission and reception.

3.4 Software Configuration

The module's parameters, such as frequency, power, data rate, and communication key, are configurable via software. These parameters are saved after power off and will be retained upon subsequent power-on. Refer to the detailed programming guide or SDK provided by EBYTE for specific commands and protocols to configure the module.

4. Operating Instructions

The E220-900T22S module offers various operational modes and features to optimize wireless communication.

4.1 Data Transmission

• Fixed-Point Transmission: Send data to a specific module by addressing its unique identifier.
• Broadcast Transmission: Send data to all modules within range, useful for general announcements or commands.
• The module supports a data transmission rate from 2.4kbps to 62.5kbps, which can be configured to suit application requirements.

4.2 Air Wakeup (WOR)

The air wakeup (WOR) function allows the module to operate in an ultra-low power consumption mode, waking up only when data is detected. This feature is ideal for battery-powered applications where energy efficiency is critical.

Figure 3: Illustration of the WOR (Wake on Radio) function, demonstrating how the module effectively achieves low power consumption by waking up only when needed, leading to up to 30% power savings.

4.3 RSSI Signal Strength Indicator

The module provides an RSSI (Received Signal Strength Indicator) function. This allows users to evaluate signal quality, optimize communication networks, and perform ranging applications.

Figure 4: Depiction of the RSSI signal strength indicator function, which is beneficial for assessing signal quality, improving communication networks, and ranging.

4.4 LoRa Spread Spectrum Technology

Utilizing new LoRa spread spectrum technology, the E220-900T22S offers superior anti-interference capabilities, longer transmission distances, and enhanced communication stability compared to traditional solutions.

Figure 5: Explanation of LoRa spread spectrum technology, highlighting its benefits such as longer communication distance, faster speed, and stronger anti-interference ability.

5. Maintenance

The E220-900T22S module is designed for robust and long-term use in industrial environments. Minimal maintenance is required, but adhering to the following guidelines will ensure its longevity and reliable operation:

• Environmental Conditions: Operate the module within the specified temperature range of -40°C to +85°C. Avoid exposure to extreme humidity, dust, corrosive gases, or strong electromagnetic interference.
• Handling: Handle the module with care to prevent physical damage. Avoid bending or stressing the PCB. When soldering, ensure proper techniques to prevent short circuits or damage to components.
• Cleaning: If necessary, clean the module gently with a soft, dry cloth. Do not use harsh chemicals or solvents.
• Power Supply Stability: Ensure a stable and clean power supply to prevent erratic behavior or damage to the module.

6. Troubleshooting

If you encounter issues with the E220-900T22S module, consider the following troubleshooting steps:

• No Power/Module Not Responding:
  • Verify that the power supply voltage is within the 2.3V-5.5V range and is stable.
  • Check all power and ground connections for proper contact.
• Communication Failure:
  • Ensure that the TX/RX pins are correctly connected to your host device.
  • Verify that the serial port settings (baud rate, parity, stop bits) on both the module and the host device match.
  • Check that the modules are configured to the same frequency, data rate, and communication key.
  • Inspect the antenna connection. A loose or damaged antenna can severely impact range and reliability.
  • Check for strong local interference that might be disrupting the signal.
• Short Range/Poor Signal Quality:
  • Ensure the antenna is suitable for the operating frequency and is properly installed.
  • Check for physical obstructions (walls, metal objects) between the transmitting and receiving modules.
  • Verify the transmit power setting of the module; increase if necessary and permissible.
  • Use the RSSI function to evaluate signal quality and adjust antenna placement or module position.
• Module Restarts Unexpectedly:
  • This module has an efficient watchdog design for automatic restart. If frequent, check for power supply fluctuations or software errors that might be triggering the watchdog.

7. Applications

The versatility and robust performance of the E220-900T22S module make it suitable for a wide range of applications, including:

• Home security alarm and remote keyless entry systems
• Smart home and industrial sensor networks
• Wireless alarm security systems
• Building automation solutions
• Wireless industrial-grade remote control
• Advanced Meter Reading Architecture (AMI)
• Automotive industry applications

Figure 6: Examples of applications for the E220-900T22S module, including building control, entrance guard systems, car parks, elevators, alarm apparatus, and archives.

8. Warranty and Support

For specific warranty information, please refer to the terms and conditions provided by EBYTE at the time of purchase. EBYTE also offers customized development services for specific project requirements.

8.1 Manufacturer Support

For technical support, additional documentation, or inquiries, please visit the official EBYTE website:

http://www.cdebyte.com/