NEC FA Series Installation And Maintenance Manual page 102

Check the port in "Select Communication Port", select the Main (Primary) and Backup system LED controllers
by their IP address, and then click "Next".
Configure the settings for the Main (Primary) controller and Backup controller separately.
Main (Primary) Backup
On the Main (Primary) side
Click the "Restore Factory Settings" button for initialization.
After initialization, configure the settings for "Select Input Source" and "Source Configuration".
If the factory setting is correctly configured and the device connection is the same as when the factory setting
was configured, check the settings without performing initialization.
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