Blocking of groups
When 2 Talk 8s are connected to a single zone unit, they have the ability to block zones, as a zone can only receive an announcement from one of the Talk 8s at a time.
When a Talk 8 is in its zone selection state, all currently selected zones will be blocked on the other Talk 8, shown by the zone button lighting up red. This also applies to a group, the group button will light up red, showing that one or more zones in that group are blocked. Zones will also be blocked if a timed announcement is triggered.
Once the Talk 8 doing the blocking has finished its announcement or playback and returned to its Idle state, the zones will become unblocked for the other Talk 8.