In order to format memory of historical data in the device:
1) Connect the PM180 by to TCP/IP port.
2) RUN CMD (Command Line console) in your computer.
3) Print relevant IP address and press ENTER, Example: telnet 192.168.0.205
3) Login password: -> input '0' and press ENTER
4) Print 'mem' and press ENTER
5) Print 'erase' and press ENTER
Warning: all historical data in device will be erased.