Westermo WeConfig - Manual (Page 7)

7 WeConfig
Alternative IP Setting
Due to a shortcoming in the IPConfig protocol, an address with subnet mask
255.255.255.0 has to be used for scanning. If no subnet is available, add an additional
address for smoother operation. Make sure the address selection does not interfere with
other devices in the network.
Open Network Settings using the Windows control panel in the TCP/IP properties
dialogue, click Advanced button.
Now click the Add button and enter an alternative address with subnet mask
255.255.255.0. There should now be two addresses available.