• sales

    +86-0755-88291180

Modbus POE ETH Relay Waveshare User Guide

Hardware Connection

  • Connect the Modbus POE ETH Relay to the LAN via a network cable, and supply power through the power port or the POE.


Note: The above figure is powered by a PoE Ethernet port. If it is an ordinary network cable, it must be powered by an external power adapter, which can be powered by an external power supply in the range of 7~36V.

Software Preparation

Waveshare Cloud Configuration

Create Device

Waveshare Cloud provides exclusive device control examples for Modbus POE ETH Relay, and you can start by quickly creating devices.

Quick Start

The platform supports one-click quick start, go to Device Management ->Device List ->One-click Add:


Detailed Steps (Skip to Device Settings for Quick Start)

When creating device properties, you can choose the HEX character type, enter the hex value of the corresponding switch, and select to display the chart


Device Settings

Open VirCom to configure device MQTT connection properties. Please note that if the device has already been configured with some information, it is recommended to load default parameters and restart the device before configuring, for example:




For the modified device, go to Firmware and Configuration



Copy the device subscription address parameters of Waveshare IoT and fill them into the settings, save and download, and wait for a prompt indicating successful transmission


View the TCP connection in Device Management to see if the cloud device is online by displaying established connections


Device Control

Go to the console, view the device, and enter development


Enter the device details page to view the switch-type devices, click the button to set the status of the terminal hardware device


At this time, we check the trigger status of the Modbus PoE ETH Relay relay. Here, CH1 corresponds to relay 0, which is the relay set in the cloud


TAG: Raspberry Pi 8inch LCD 768x1024 Capacitive TouchScreen HDMI Display Raspberry Pi 64MP Camera DeepSeek XiaoZhi AI Voice Chat Robot BOX ESP32-S3 Development Board 3.5 inch QSPI LCD N16R8 Touchscreen Display 6-Axis /Camera /SD Luckfox Pico SPI Jetson Nano Heatsink Raspberry Pi Pico 2 RP2350 1.28 inch Round LCD TouchScreen Development Board 240x240 Display QMI8658 6-Axis $17.9 Finger Vein Scanner Module (B) Cortex M4F UART serial port EAL4+ security certification qualification RP2040 LoRa Jetson Nano Fan Circular LCD Screen ESP32 C3 Voice Robot Mini Development Board AI DeepSeek Toy Doll Core 1.28 inch 1.54inch LCD Raspberry Pi 5 Raspberry Pi 5 Sound Card ESP32 S3 LCD Development Board 1.3 inch Display 1.3inch Screen ST7789 240x240 Mini TV SD-Port QST QMI8658 Gyro Sensor LVGL For Arduino ESP32-S3 GEEK GPS LCD Driver Board ADXL356BEZ Spotpear Zero LCD HAT (A) Raspberry Pi OpenWrt Tutorial 2