Comelit 1998A - U21 How to activate (MASTER) or deactivate (SLAVE) the main switchboards

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f to end the conversation, hang up the handset.
U21 How to activate (MASTER) or deactivate (SLAVE)
the main switchboards (available from R.I.006)
When using 2 main switchboards configured in series, use
one of the following methods:
• press the A/V key on the active switchboard (MASTER),
the following screen will appear:
* 1- MASTER
2 - SLAVE
f press 2 to deactivate it (SLAVE). The switchboard will
switch o, while the other switchboard will switch on
automatically to become the MASTER.
or
• press ON/OFF on the deactivated switchboard (SLAVE) to
switch it on.
f press the A/V key and the following screen will appear:
* 1- MASTER
2 - SLAVE
f press 1 to confirm that you wish to activate the
switchboard (MASTER).
f press ESC repeatedly to return to the main screen.
The other switchboard will be deactivated automatically, to
become the SLAVE.