Allen&Heath GR1 USER GUIDE - Manual (Page 14)

GR1
USER GUIDE
14
LINK OPTIONS - ALARM SOURCE
Selects either the external alarm input
or local MIC 6 as the local alarm
source and feed to other GR1 units
within a SYS-LINK connected sys-
tem.
ALARM OVERRIDE
To allow automatic control of the system by an alarm recording or emergency announce-
ment the GR1 includes a comprehensive alarm override feature. When activated the front
panel ALARM ACTIVE LED lights and the 3 main outputs are automatically switched to
the selected alarm audio source. This is selected by internal jumper links to be the ALARM
AUDIO IN on the SYS-LINK IN connector or the local MIC 6 input.
The alarm system is activated when the opto-coupled ALARM DC connection is linked to
0V. This may be done by a switch or external logic system.
Control states are: +15V (open circuit) = normal output
0V (link to 0V)
= alarm active
The alarm signal is switched directly before the main outputs and is
not affected by the compressor/limiters or output level control. Com-
bined with the automatic power backup feature this provides a
complete and foolproof emergency system.
Connect a nominal -2dBu line
level unbalanced signal to
ALARM IN
LINK OPTION - ALARM AUDIO TEST
An internal jumper may be set for
diagnostic testing of the alarm audio
source without activating the alarm
DC control. Audio may be routed to
the outputs for checking by selecting
CH1 MUTE position with the link set
to ALARM TEST.