Redback® A 4574
Alert/Evac/Chime Tone Generator
www.redbackaudio.com.au
Redback® Proudly Made In Australia
5
Redback® A 4574
Alert/Evac/Chime Tone Generator
8.0 24V OUTPUT CONNECTIONS
The A 4574 is fitted with four sets of 24V switched outputs for driving external devices such as strobes, sirens and attenu-
ators. Each output has a maximum current draw of 120mA. When connecting devices which require more than 24V DC @
120mA then an external supply and relays will be required.
In the illustration of figure 3 a high current school bell is to be activated by the Bell 24V switched output. As the current
draw of the Bell is more than 120mA, a relay board is used to switch an external power supply. The Altronics S 4444 24V
Relay Board as shown is an inexpensive and easily installed option designed for this purpose. 24V DC strobes such as the
Altronics S 5423, S 5430 and S 5435 strobes also draw more than 120mA so they are connected in the same fashion as
shown in figure 3.
Switched 24V Out:
These contacts are for connection of override relays in remote volume controls. An override relay is necessary where
attenuators are used so that the alert tone, evac tone or message is broadcast at full volume regardless of the volume
setting on the individual volume control (attenuator).
The override relay can be set to “NORMAL” mode when connection is made between the N/O (normally open) contact
and the GND connection. In this configuration 24V appears when any of the alert tone, evac tone, voice over message or
paging functions are activated.
The override relay can be set to “FAILSAFE” mode when connection is made between the N/C (normally closed) contact
and the GND connection. In this configuration 24V is removed when any of the alert tone, evac tone, voice over message
or paging functions are activated.
Alert 24V Out:
These contacts are for switched 24V outputs whenever the alert tones is activated. This may be used to run external
systems such as strobes in unusually noisy environments. These operate in the same manner as the switched 24V out
contacts i.e. connection between the N/O contact and the GND contact will operate in NORMAL mode and connection
between the N/C contact and the GND will operate in FAILSAFE mode.
Evac 24V Out:
These contacts are for switched 24V outputs whenever the evac tones is activated. This may be used to run external
systems such as strobes in unusually noisy environments. These operate in the same manner as the switched 24V out
contacts i.e. connection between the N/O contact and the GND contact will operate in NORMAL mode and connection
between the N/C contact and the GND will operate in FAILSAFE mode.
Bell 24V Out:
These contacts are for operating an external relay used to operate something like a lunch bell etc.
These operate in the same manner as the switched 24V out contacts i.e.: connection between the N/O contact and the
GND contact will operate in NORMAL mode and connection between the N/C contact and GND will operate in FAILSAFE
mode.
Fig 3.
L
R
Audio
Out
24V
DC IN
www.redbackaudio.com.au
Manufactured in Australia
By Altronic Distributors Pty. Ltd.
1 2 3 4 5 6 7 8
DIP
Switch
Settings
DIP Switches
+
-
Volume
Bell
Voice
Over
Alert/
Evac
5
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
6
0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
7
0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
8
0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
Delay
(Sec.)
O
FF
30
60
90
120
150
180
210
240
270
300
330
360
390
420
450
AUTO ALERT TO EVAC SWITCHOVER TIMER SETTINGS. 0 = OFF. 1 = ON.
SW
+_
24V
DC In
Bell
Alert
Cancel
Evac
Contacts
N/O
GND
N/C
Switched
N/O
GND
N/C
N/O
GND
N/C
N/O
GND
N/C
24V Outputs
(Outputs limited to 120mA)
Evac
Alert
Bell
Interface
1 2
3
4 5
6
7 8
ON
4
Momentary operation
of Alert & Evac contacts
Bell - Repeatedly plays until
Not Used
OFF
1
2
Bell - Plays Once after
SW
3
Continuous operation
of Alert & Evac contacts
Not Used
Activation
Cancel Activated
Attenuator fitted
with over ride relay.
(such as Altronics A 2260)
24V Strobes for
visual warning
(such as Altronics
S 5430 and S 5435)
24V Bell
(eg school bell, lunch bell etc)
+24V
GND
24V Relay Board
(Altronics S 4444)
N/C1
N/C2
N/O2
N/O1
COM1
COM2
External
24V DC Supply
+24V
GND
+24V
GND
24V Relay Board
(Altronics S 4444)
N/C1
N/C2
N/O2
N/O1
COM1
COM2
External
24V DC Supply
+24V
GND
