How to Use UART to ETH: Examples, Pinouts, and Specs

The UART to ETH module, manufactured by Waveshare (Part ID: B), is a versatile converter that bridges UART (Universal Asynchronous Receiver-Transmitter) communication with Ethernet networks. This component enables seamless transmission of serial data over Ethernet, making it ideal for applications requiring remote data access, industrial automation, IoT devices, and networked embedded systems.

By converting UART signals to Ethernet packets and vice versa, this module allows devices with serial interfaces to communicate over long distances via Ethernet infrastructure, providing flexibility and scalability in system design.

• Industrial automation and control systems
• IoT (Internet of Things) devices
• Remote monitoring and data logging
• Serial device networking
• Home automation systems

The UART to ETH module has a simple pinout for easy integration into circuits. Below is the pin configuration:

1. Power the Module: Connect the VCC pin to a 3.3V or 5V power source and the GND pin to ground.
2. Connect UART Interface:
   • Connect the TXD pin of the module to the RX pin of your microcontroller or UART device.
   • Connect the RXD pin of the module to the TX pin of your microcontroller or UART device.
3. Connect Ethernet Interface:
   • Use an Ethernet cable to connect the module to a network switch, router, or another Ethernet-enabled device.
4. Configure the Module:
   • Use the provided configuration software or AT commands to set the UART baud rate, IP address, and other network parameters.
5. Test Communication:
   • Send data from the UART device to the module and verify that it is transmitted over the Ethernet network.

• Ensure that the UART baud rate of the module matches the baud rate of the connected device.
• Use proper grounding to avoid noise interference in UART communication.
• If using the module in a noisy environment, consider adding decoupling capacitors near the power pins.
• Configure the Ethernet settings (e.g., static IP or DHCP) according to your network requirements.
• Avoid exceeding the module's operating voltage and temperature limits to ensure reliable operation.

Below is an example of how to connect the UART to ETH module to an Arduino UNO and send data over Ethernet.

// Example code to send data from Arduino to UART to ETH module
// Ensure the baud rate matches the module's configuration

void setup() {
  Serial.begin(9600); // Initialize UART communication at 9600 baud
  delay(1000);        // Wait for the module to initialize

  Serial.println("Hello, Ethernet!"); // Send data to the UART to ETH module
}

void loop() {
  // Continuously send data every 2 seconds
  Serial.println("Sending data over Ethernet...");
  delay(2000);
}

1. No Data Transmission Over Ethernet

   • Cause: Incorrect UART baud rate or Ethernet configuration.
   • Solution: Verify and match the UART baud rate of the module and the connected device. Check the Ethernet settings (e.g., IP address, subnet mask).

2. Module Not Powering On

   • Cause: Insufficient power supply or incorrect voltage.
   • Solution: Ensure the VCC pin is connected to a stable 3.3V or 5V power source.

3. Data Corruption or Noise

   • Cause: Poor grounding or long UART cables.
   • Solution: Use shorter cables and ensure proper grounding. Add decoupling capacitors if necessary.

4. Ethernet Connection Drops Frequently

   • Cause: Network instability or incorrect Ethernet wiring.
   • Solution: Check the Ethernet cable and ensure proper wiring of ETH_TX+, ETH_TX-, ETH_RX+, and ETH_RX-.

• Q: Can the module work with 3.3V logic devices?

  • A: Yes, the module supports both 3.3V and 5V logic levels.

• Q: How do I reset the module?

  • A: Pull the RESET pin low for a few milliseconds and then release it.

• Q: Can I use this module with a Raspberry Pi?

  • A: Yes, connect the UART pins of the module to the GPIO UART pins of the Raspberry Pi and configure the serial port accordingly.

• Q: Does the module support DHCP?

  • A: Yes, the module can be configured to use DHCP or a static IP address.

This documentation provides a comprehensive guide to using the Waveshare UART to ETH module (Part ID: B). For further assistance, refer to the manufacturer's datasheet or support resources.