Question:

【What is the product model?】: Ethernet module USR-K7
【What's the firmware version?(You can get firmware version from AT command AT+VER or settings webpage): MAC: 9CA5258D2175
【How do you connect and configure the USR device?】: Ethernet cable, web browser
【What's your application? What do you want to realize?】:PIC micro serial to ethernet comunication. I don't have any netwok activity (yellow LED blinking, but green LED is off). IP (default) 192.168.0.7 not responding.

Answer:

USR-K7 uses R232 to USB cable to connect to the computer.
On the computer, open the software, open COM, +++a to enter the configuration state.
The AT command can be set.
First use the AT command, AT+RELD to restore the factory, and then use the network to search for K7 devices.

This is the serial AT command setting software: https://usriot.com/support/downloads/usr-m4-setup-software-v234102.html