www.redbackaudio.com.au
Redback® Proudly Made In Australia
18
Redback®
Programmable Control System
3.8 SERIAL CONTROLLED 100V LINE ATTENUATOR
This setup utilises a Redback
®
A 6507 seven step 100V 50 Watt line speaker attenuator/volume control which can be re-
motely adjusted via RS485 serial control. A 24V DC override relay is included for emergency paging applications, ensuring
the volume is switched to maximum regardless of the volume setting.
The unit is suitable for all 100V line amplifiers and connects between the amplifier output and the speakers to be controlled.
The Redback
®
A 6507 will interface directly to the Redback
®
A 6530 or A 6540 series wallplate or any other third party
control system which utlises RS485 serial codes. The attenuator circuit includes a 22uF BP capacitor for line monitoring ap-
plications.
The figure below illustrates a typical connection diagram when using the Redback
®
A 6530 or A 6540 series wallplate
wallplate to control the
Redback
®
A 6507 Attenuator. The Redback
®
A 6530 or A 6540 series wallplate connects via a Cat5e/6 lead into the “To A
6500” RJ45 connection port. 24V DC power is supplied to the Redback
®
A 6507 via a 24V DC plugpack or other 24V DC
source (minimum24V DC 1A).
Serial control of the attenuator circuit is provided by the A 6530 or A 6540 series wallplate which is programmed with the
serial codes using the PC software supplied with the wallplate.
The audio into the attenuator is provided by an amplifer with a 100V line output. The attenuated signal is then output out
of the attenuator into the speaker load up to a maximum of 50 watts of load.
Emergency or paging override of the audio can be achieved by applying 24V DC to the Override Relay terminals. Once
activated the output volume will switch to maximum regardless of the volume setting.
For more information refer to the Redback® A 6507 Instructions or the Redback website - www.redbackaudio.com.au
Fig 3.8
Redback® A 6541
Redback® A 6507
24V DC PLUGPACK
(MINIMUM 1A)
(Not Supplied)
(Cat5/6 Cable 50m Maximum)
A 6507
Serial Attenuator
1 2 3 4
To
A 6500
100V
OUT
Override Relay
24V DC IN
B
A
RS485
To Other
Devices
DIP
Switches
100V
IN
Failsafe
Normal
_
+_
+
_
+ _
1
2
3
4
240V AC @ 50Hz
Line
Mic
L
R
100V
OUTPUT
+
–
2
1
3
24V DC Emergency
Output Unit
100V Amplifier