| Test | Command/Action | Expected Result | |------|----------------|------------------| | Version confirmation | AT+VER | New version string | | Serial loopback | Short TX to RX, send AT | OK response | | TCP server mode | nc <EW11_IP> 8899 | Connection established | | DHCP lease | Check router’s client list | Valid IP assigned | | Factory reset (optional) | AT+FACTORY | Default settings restored |
After a successful update, perform these checks:
The Elfin-EW11 is a compact serial device server that bridges RS485 Modbus RTU data to Wi-Fi. It is powered by the and features a full TCP/IP protocol stack, making it a popular choice for monitoring solar inverters, smart grids, and industrial sensors. How to Update EW11 Firmware