This product is resistant to high temperatures and can operate from -40 degrees to plus 85 degrees. Super anti-interference ability, can be connected to external high-current AC contactor and relay, will not crash under strong electromagnetic interference.The true 100M speed enables reliable communication with zero delay commands. Industrial grade products. Support for automatic IP acquisition. Support 10 TCP client connections under the TCP server. Through the provided configuration software, you can configure five working modes: TCP server, TCP client, UDP server, UDP client, DNS domain name.4. In the figure above, the COM1 first relay common terminal, NO1 first relay is normally open, and NC1 second relay is normally closed. COM2, NO2, NC2 are the second way, the function is the same as above.Reset, used to restore the factory equipment. In the absence of power, use a toothpick or a sharp object to hold the reset hole intact, connect the power supply, and then turn on the toothpick next to the LED indicator light to restore the factory equipment IP to 192.168.0.105.If you want to upgrade the software, you must be in the reset state to upgrade. After successful reset, the LED flashes quickly (flashes twice a second). If you want the controller to operate normally, you need to power it on again. The normal running LED is in slow-flash status (flashing once every second). Introduction to working mode: The working mode is configured with the provided configuration software. 1, TCP server In this mode, the device can only be connected through the TCP client and supports the connection of 10 TCP clients. 2, TCP client In this mode, the device actively connects to the TCP server (remote IP and remote port number are parameters for device connection). Only one server can be connected. 3, UDP server In this mode, any UDP communication is supported. 4, UDP client In this mode, only UDP communication is supported for remote IP and remote port number (configuration software settings). 5, DNS domain name In this mode, the device connects to the TCP server (the port is the remote port) that binds the domain name with a TCP client. Support MODBUS TCP Support 05,0f function code, there are configuration routines, support MODBUS POLL, MODSCAN software test, two relay address is 16, 17 (decimal). High-speed communication: High-speed communication, the computer does not have to wait for the device to send data, and the device can handle it. Working under the TCP server, the device supports 10 TCP clients to continuously send data. Network chips that are not SPI ports are comparable to chips such as ENC28J60 and W5500. The real 100M network port. Material: Metal colour: blue Package Contents: 1 x Ethernet relay module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.