www.altronics.com.au
Redback® Proudly Made In Australia 13
Setup
2.2 Priorities
There are 4 levels of priority in the A 4275/85.
Level 1
Input 1 has the highest level of priority if the VOX is enabled for this input. (Refer to section 2.3 for DIP
switch and VOX sensitivity settings). It will override all other inputs including the optional A 4573
alert/evacuation module (if fitted). This input could be used for emergency microphone paging or telephone pag
ing etc.
Level 2
The optional A 4573
alert/evacuation module (if fitted)
provides the next level of priority and will override all
inputs except input1.
Level 3
If the VOX is enabled on input 2 it will override inputs 3 to 6. (Refer to section 2.3 for DIP switch and VOX
sensitivity settings).
Level 4
If the VOX is enabled on input 3 it will override inputs 4 to 6. (Refer to section 2.3 for DIP switch and VOX
sensitivity settings).
Note1 : Inputs 4-6 have no VOX.
Note 2 : Any Vox activation will trigger the 24V DC Switched Output ((when set “ON”) check the DIP switch
settings for more details).
Figure 2.2A demonstrates an install with all 4 levels of priority shown. The A 4573 is fitted and assumes level 2 priority.
Input 1 is shown with a microphone connected. The DIP1 switch settings are set for a 100mV sensitivity balanced micro-
phone input with the priority/VOX enabled which makes this input priority level 1. (Refer to section 2.3 for more details
about DIP switch settings). Input 2 is connected to a telephone paging system with a line level output. The DIP1 switch
settings are set for a line level input with 1V input sensitivity and the VOX enabled which makes this input priority level
3. Input 3 is shown with a microphone connected. The DIP2 switch settings are set for a balanced microphone input and
with the VOX enabled which makes this input priority level 4. Inputs 4-6 have no VOX option.
Fig 2.2A
Telephone Paging
System
Speakers fitted with
100V line transformers.
CD
REDBACK
CD
REDBACK
CD
REDBACK
4 -16Ω
70V
100V
OUTPUTS
L
R
24V DC IN
Balanced Mic
+_
PTT
(short to
activate)
Power Fail
(Contacts
close on
power fail)
Send
Return
Tape Out
Preamp Out
Link To Charge
Backup battery
Input 1
Input 3
Input 2
Input 4
Input 5
Input 6
ALERT - EVAC MODULE
Output Levels
Voice Chime Alert
Over
& Evac
EV
COM
CAN
CH
AL
Triggers
L
R
+ –
Rem. Vol
Connect
to 1K
Ω
Pot
+
–
+
–
+
–
Line
24V DC
Switched
Output
DIP 5
Interface
DIP 4
DIP 1
DIP 2
DIP 3
Balanced Mic
Line
Balanced Mic
Line
Balanced Mic
Line
Balanced Mic
Line
Balanced Mic
Line
Balanced Line
L
R
L
R
L
R
L
R
L
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
1 2
3
4 5
6
7 8
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
230V AC @ 50Hz
w
w
w
.altr
onics
.com.au
RESETTABLE
DC FUSE
Made in Australia
by Altronic
Distributors
Pty Ltd
DIP 5
DIP 4
IMPORTANT NOTE
Ensure power is switched OFF when
adjusting DIP switches. New
settings will be effective when
power is switched back on.
DIP 3
SW
Item
On
Off
1
2
Input 6 Level 1V
100mV
3
Not USed
4 Input 5 Level 1V
100mV
Not USed
1
2
3
4
DIP 2
SW
Item
On
Off
Input 4 Level
1V 100mV
Not USed
Input 3 Level
1V 100mV
Input 3 Priority
On Off
*
DIP 1
SW
Item
On
Off
1
2
Input 2 Level
1V 100mV
3
Input 2 Priority
On Off
4 Input 1 Level
1V 100mV
Input 1 Priority
On Off
**
SW
Item
On Off
1
2
3
4
Not Used
Not Used
Not Used
Not Used
DIP 4
DIP 1
DIP 2
DIP 3
SW
Item
On Off
Switched 24VDC Out
On Off
Phantom Power Input 6
On Off
On Off
1
2
3
4
Phantom Power Input 5
On Off
5
Phantom Power Input 4
On Off
6
Phantom Power Input 3
On Off
7
Phantom Power Input 2
On Off
8
Phantom Power Input 1
Preamp Out
†
Post
Pre
†
Sets the Preamplifier output to
Pre or Post Master.
DIP 5
Priority or VOX muting is only
functional on inputs 1-3. When
VOX is enabled on input 1 it will
override all other inputs includ-
ing the Alert/Evac Module. VOX
enabled on input 2 will override
inputs 3-6. VOX enabled on input
3 will override inputs 4-6.
If the Alert/Evac module is fitted
it will override inputs 2-6.
*
Model 125W
5A
AC Fuse
250W
7.5A
AC Fuse Ratings
RISK OF ELECTRIC SHOCK
OPEN BY QUALIFIED
PERSONNEL ONLY
!
CAUTION
DIP 3
ON
1 2 3 4
DIP 1
ON
1 2 3 4
Evacuation Trigger
Alert Trigger
Chime Trigger
Cancel Trigger
Evacuation tones can
be triggered by closing
contacts such as switches,
from Fire Indicator Boards
or the like.
DIP 2
ON
1 2 3 4
Input 1 & 2 Settings
SW1 set to ON for 1V sensitivity on Input 2
SW2 set to ON to enable the VOX/priority
SW3 set to ON to enable the VOX/priority
SW4 set to OFF for 100mV sensitivity on Input 1
Input 5 & 6 Settings
SW1 set to ON for 1V sensitivity on Input 6
SW2 Not Used
SW3 Not Used
SW4 set to ON for 1V sensitivity on Input 5
Input 3 & 4 Settings
SW1 set to ON for 1V sensitivity on Input 4
SW2 Not Used
SW3 set to ON to enable the VOX/priority
SW4 set to OFF for 100mV sensitivity on Input 3
