User Documentation

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The Modbus Gateway Administrator window should appear as shown below.
7.2.2 Searching Devices
Searching for Modbus Gateway devices
The button Search can be used to find devices
either by Broadcast search or by addressing an
unique IP address.
Broadcast Search allows to find Modbus
Gateway on the LAN by sending a Layer-2
based Ethernet broadcast frame independant
of used IP addresses. Detected devices will be
displayed in the windows. If you want to
configure a detected device then both devices 
the PC and the Modbus Gateway  must be in
the same IP range that they are able to
communicate with each other.
Search by IP attempts to connect
to a unit directly by a specified IP address. This method has to be used if a unit is located outside the
LAN and can only be accessed by going through a router.