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

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.