Schneider Electric Modbus Plus Network Bridge Multiplexer none - Manual (Page 61)

Configuring the Modbus Models 31007492 51
3.10.2 Using the V4 Screen
To write (save) the configuration you have entered into the BM85, enter
the following command:
W
To initialize the entire set of configuration parameters in the BM85 to
their default values, enter the following command:
D
Note that initializing the configuration parameters also clears the
Modbus Address Map tables for all four ports to zeros.