REYAX RYLR998 UART Interface 868/915 MHz LoRa Module Instruction Manual

1. Introduction

This manual provides detailed instructions for the REYAX RYLR998 UART Interface 868/915 MHz LoRa Module. The RYLR998 is a high-performance LoRa module designed for long-range, low-power wireless communication applications. It integrates a NUVOTON MCU and Semtech LoRa Engine, offering robust connectivity and ease of use via AT commands.

Figure 1: REYAX RYLR998 LoRa Modules in a conceptual long-range communication setting.

1.1 What's in the Box

• 1x REYAX RYLR998 UART Interface 868/915 MHz LoRa Module with Antenna
• 1x Shielding case

2. Key Features

• LoRa proprietary mode for secure and efficient communication.
• Integrated NUVOTON MCU and Semtech LoRa Engine for reliable performance.
• Excellent blocking immunity, enhancing signal integrity in noisy environments.
• Smart receiving power saving mode for optimized energy consumption.
• High sensitivity for extended range and robust link quality.
• Easy control via AT commands, simplifying integration and development.
• Built-in antenna for compact design and immediate use.
• FCC, CE, and NCC Certified, ensuring compliance with international standards.

3. Safety Information

Observe the following safety guidelines to ensure proper operation and prevent damage to the module or connected devices:

• Power Supply: Ensure the power supply voltage is within the specified operating range for the module. Incorrect voltage can cause permanent damage.
• Electrostatic Discharge (ESD): Handle the module with care, preferably in an ESD-safe environment, to prevent damage from static electricity.
• Antenna: Do not operate the module without its antenna connected.
• Environment: Avoid exposing the module to extreme temperatures, humidity, or corrosive substances.
• Modifications: Do not attempt to modify the module's hardware, as this may void certifications and warranty.

4. Product Overview

The REYAX RYLR998 is a compact LoRa module designed for integration into various electronic projects. Its small form factor and built-in antenna make it suitable for space-constrained applications.

Figure 2: REYAX RYLR998 LoRa Module with integrated antenna.

4.1 Dimensions and Weight

• Product Dimensions: 1.26 x 0.55 x 0.09 inches (32 x 14 x 2.3 mm)
• Item Weight: 0.106 ounces (3 grams)

4.2 Pinout (Typical)

The module typically features standard UART pins for communication and power supply pins. Refer to the official datasheet for the precise pin configuration and electrical characteristics.

5. Setup

This section guides you through the initial setup of your RYLR998 LoRa module.

5.1 Connecting the Module

1. Power Supply: Connect the VCC pin to a stable 3.3V power source and GND to ground.
2. UART Connection: Connect the module's TXD pin to the RXD pin of your microcontroller or USB-to-UART converter, and the module's RXD pin to the TXD pin of your microcontroller or converter.
3. USB-to-UART Bridge: For convenient testing and development, it is recommended to use a USB-to-UART bridge such as the REYAX RYLS135 USB to UART Bridge.
4. Antenna: Ensure the integrated antenna is not obstructed.

5.2 Initial Configuration

The RYLR998 module is controlled using AT commands sent via the UART interface. A terminal emulator (e.g., Tera Term, PuTTY) can be used for initial communication.

1. Terminal Settings: Configure your terminal emulator with the correct baud rate (default is often 115200 bps), 8 data bits, no parity, 1 stop bit, and CR/LF (Carriage Return and Line Feed) for line endings. The module expects commands to be terminated with CR/LF.
2. Test Communication: Send the command AT. The module should respond with +OK.
3. Reset Module: To ensure a clean state, send the command AT+RESET. The module will restart.

6. Operating Instructions

The RYLR998 module operates in a peer-to-peer fashion. For communication, you will need at least two modules.

6.1 Basic AT Commands

Here are some fundamental AT commands for operating the module:

• AT+SEND=address,length,data: Sends data to a specified module. Replace address with the target module's address, length with the data length, and data with the message.
• AT+ADDR=address: Sets the module's own address.
• AT+PARAMETER=SF,BW,CR,Preamble: Configures LoRa parameters like Spreading Factor (SF), Bandwidth (BW), Coding Rate (CR), and Preamble length.
• AT+BAND=frequency: Sets the operating frequency band (e.g., 868000000 for 868MHz, 915000000 for 915MHz).
• AT+VER: Retrieves the firmware version.

For a complete list of AT commands and their detailed usage, refer to the official REYAX RYLR998 datasheet.

6.2 Peer-to-Peer Communication

To establish communication between two or more RYLR998 modules:

1. Configure each module with a unique address using AT+ADDR=address.
2. Ensure all modules are operating on the same frequency band and LoRa parameters.
3. Use the AT+SEND command from one module, specifying the address of the target module.
4. The receiving module will output the received data via its UART interface, typically in the format +RCV=address,length,data.

7. Maintenance

The RYLR998 module is designed for long-term, reliable operation with minimal maintenance. Follow these general guidelines:

• Cleaning: If necessary, gently clean the module with a dry, soft cloth. Avoid using liquids or solvents.
• Storage: Store the module in a dry, cool environment, away from direct sunlight and extreme temperatures.
• Physical Inspection: Periodically inspect the module for any signs of physical damage, loose connections, or corrosion.
• Antenna Care: The antenna solder pads are delicate. Handle the module carefully to prevent the antenna from breaking free.

8. Troubleshooting

If you encounter issues with your RYLR998 module, consider the following troubleshooting steps:

• No Response to AT Commands or +ERR=1:
  • Ensure your terminal emulator is configured to send commands terminated by CR/LF (Carriage Return and Line Feed). Some emulators default to only CR or LF.
  • Verify the UART wiring (TXD to RXD, RXD to TXD, GND to GND).
  • Check the baud rate setting.
• Inconsistent Operation or Data Loss:
  • After sending an AT command, allow a brief delay (e.g., 100-200ms) before sending the next command, and always check for a +OK or +ERR response.
  • Ensure a stable power supply. Voltage fluctuations can cause instability.
  • If using with microcontrollers like Arduino Nano, a voltage divider might be necessary for proper voltage level shifting on UART lines.
• Unable to Change Frequency Band:
  • Some modules may revert to default settings after power cycling if the new settings are not saved correctly. Refer to the datasheet for specific commands to save configurations (e.g., AT+SAVE or similar).
  • Verify the frequency value is within the module's supported range and correctly formatted (e.g., in Hz).
• Limited Range:
  • Ensure the antenna is securely connected and unobstructed.
  • Check LoRa parameters (Spreading Factor, Bandwidth) – higher SF and lower BW generally increase range but decrease data rate.
  • Environmental factors like obstacles (buildings, trees) significantly impact range.

9. Specifications

Detailed technical specifications for the REYAX RYLR998 LoRa Module:

10. Certifications

The REYAX RYLR998 module holds the following certifications, ensuring compliance with relevant regulatory standards:

10.1 FCC Certification

Figure 3: FCC Grant of Equipment Authorization for RYLR998.

The module is certified by the Federal Communications Commission (FCC) for use in the United States, indicating compliance with radio frequency emission standards.

10.2 CE Certification

Figure 4: CE Verification of Compliance for RYLR998.

The CE mark signifies that the module conforms with health, safety, and environmental protection standards for products sold within the European Economic Area (EEA).

10.3 NCC Certification

Figure 5: NCC Certification for RYLR998.

The NCC certification indicates compliance with telecommunications regulations in Taiwan.

11. Warranty and Support

For warranty information, technical support, and additional resources, please visit the official REYAX store or contact REYAX customer service.

REYAX Store: Visit the REYAX Store on Amazon