Raymarine Ray230 - Manual (Page 51)

3-28 Operations
Note: Normally, when Handset 1 is removed from the cradle, it
automatically takes priority from either of the other two Handsets. In
some instances, though, it may be necessary to press and hold the CLR
key for 3 seconds before Handset 1 regains priority.
Operation States
Since it has highest priority, key operation is always possible from Handset
1 even while On-Hook. Operation of the other two handsets depends on
their On/Off-Hook status.
In these examples, disabled operation means a handset can only be used
to make a Distress Call. Limited operation means a handset can be used to
talk on the Intercom, adjust the sound volume, and make a Distress Call.
1. All Handsets On-Hook
Handset 1 Handset 2 Handset 3
On-Hook On-Hook On-Hook
Operation possible Operation disabled Operation disabled
2. All Higher-ranked Handsets On-Hook
Handset 1 Handset 2 Handset 3
On-Hook On-Hook OFF-Hook
Operation disabled Operation disabled Operation possible
3. Higher-ranked Handset is taken Off-Hook while a lower-ranked Handset
is Off-Hook
Handset 1 Handset 2 Handset 3
On-Hook OFF-Hook OFF-Hook
Operation disabled Operation possible Operation disabled