Redback A 1720B User manual

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Redback® A 1720B MP3 Tone Generator
User manual revision number: 2.1 16/03/2023
Operating Manual
The A 1720B is an MP3 based message player and tone generator designed for public address, security, customer direction
or emergency evacuation announcements.
Installation
Power requirements: The A 1720B needs a minimum of 12VDC at 300mA to work correctly. The maximum working
voltage is 30VDC, do not exceed 30VDC as it will cause permanent damage to the unit. A good working voltage is between
12 and 24VDC. The power is connected via 2 way terminal block (see g 1).
Output: Stereo output is via screw terminals and RCA sockets. Output level is nominal 500mV but is related to the recorded
level of the MP3.
Input triggers: The input triggers are activated by closing contacts whether by a normally open switch or a timer or
controller.
Switched output: The switched output terminal is triggered when any zone is activated. The voltage is the same as the
power supplied to the unit. ie if the A 1720B is powered by 12V the switched output voltage will be 12V.
Fig 1
1
2
3
11
8
9
10
4 5
6
7
Connections
1. Stereo audio output
2. Left & right RCA outputs
3. Switched power output
4. Trigger 1-8 inputs
5. Evac Trigger
6. Alert Trigger
7. Cancel Trigger
8. Micro SD Card slot
9. DIP switch
10. BCD switch
11. Power input (12-24VDC)

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Redback® A 1720B MP3 Tone Generator
Play modes
Alternate: When the A 1720B is in Alternate mode (DIP switch 1 OFF) (see Fig 1) a momentary closing contact or pulse on
the trigger pins will activate the MP3. The A 1720B will continue to play the MP3 until it nishes and will stop playing. If
the contact is held closed continually the MP3 will continue to loop over and over until the contact is released.
To stop an MP3 playing when in Alternate mode the Cancel trigger is used. A momentary closing contact on the Cancel
trigger will stop the MP3 playing (It is recommended that the Cancel contact be held for up to 2 seconds to ensure the
MP3 stops playing).
Momentary: In momentary mode (DIP switch 1 ON) (see Fig 1) the closing contact must be held for the duration of the
MP3 play time, if it is released before the MP3 ends the MP3 will stop playing immediately. If the contact is held closed
continually the MP3 will still only play once and then stop.
Putting MP3’s on to the player
You will rst need to remove power from the A 1720B, then remove the Micro SD Card from the end of the A 1720B. To
remove the Micro SD Card push the card in and it will eject itself.
The Micro SD Card will then need to be connected to a Windows based PC. You will need a PC equipped with a Micro SD
slot or use a Micro SD Card reader to do this (not supplied).
Step by step guide to put a MP3 into Trigger1 with a Windows PC
Step 1: Make sure the PC is on and card
reader connected and correctly installed. Then
insert the Micro SD Card into the reader.
Step 2: Go to “My Computer” (gure 2)
and open the Micro SD Card which is usually
marked “Removable disk”. In this case it is
named “Removable disk (G).
Please note: that the ALERT and EVAC folders
and the MP3 les inside these folders should
not be deleted or renamed in anyway this will
cause the A 1720B to stop responding.
Fig 2
Step 3:
Open Removable Disk
You should get a window that looks like
gure 3.
A library of MP3 tones are supplied in the
folder labelled #LIBRARY#. The other folders
contaon the MP3 leto be playedm when the
associated trigger is actovated.
Fig 3

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Redback® A 1720B MP3 Tone Generator
Step 4: Open folder named “trig1” you
should get a window that looks like gure 4.
Fig 4
Step 5: You should see an MP3 le
XXXXXX.MP3 if you have never changed the
trigger1 MP3 le then it will be named
Trigger1.MP3.
This MP3 le needs to be deleted and
replaced by the MP3 le you want to play
when you activate trigger1. The MP3 le
name is not important only that there is one
MP3 le in the trig1 folder. Make sure you
delete the old MP3!
The folder should look something like gure
5 where the MP2 le has been replaced with
Newtone.MP3.
Fig 5
NOTE the new MP3 le cannot be “Read only”. To check this right
click on the MP3 le and scroll down and select Properties, you will
get a window that looks like gure 6. Make sure the “Read Only”
box has no tick in it.
The new MP3 is now installed on the card and the card can be re-
moved from the PC following windows safe card removal procedures.
Make sure the A 1720B is OFF and insert the Micro SD Card back
into the Micro SD slot; it will click when fully inserted. The A 1720B is
ready to go on Trigger1.
Repeat these steps for Trigger2 to Trigger8 if you need to.
Fig 6

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Redback® A 1720B MP3 Tone Generator
Emergency tones (Alert and Evacuation)
The Alert and evacuation tones conform to Australian Standards AS1670.4 and are used to notify building occupants of
an emergency situation.
Alert: The Alert tone is activated by a closing contact on the ALERT trigger (Trigger10) and can be used in Alternate or
Momentary setup as mentioned. The Alert tone comes with a change over option which forces the A 1720B to switch
from Alert to the Evacuation tone after a prescribed time. Use the BCD switch to adjust this time or switch off completely
(see gure 7).
Evacuation: The Evacuation tone is activated by a closing contact on the Evac trigger (Trigger9) and can be used in Alter-
nate or Momentary setup as mentioned early in the instructions.
Evacuation message: A message (repeated twice) can be inserted every three evacuation cycles as per the Australian
Standards. Voice message could be something like “please evacuate the building by the closest exit”. To install a Evacua-
tion message on the A 1720B follow the Step by step guide to put a MP3 into Trigger1 with Windows XP installed PC but
replace Trigger1 with Voice i.e. put the message into the Voice folder on the Micro SD Card and delete any other MP3 le
located in the voice folder.
Priority: The Emergency tones have priority over other triggers (1 to 8) and if activated will stop any other MP3 and acti-
vate the selected emergency tone. Evacuation also has priority over Alert.
Fig 7. Alert to Evac mode switch-over time BCD switch settings
Troubleshooting
NO Power (Power LED does not illuminate):
Make sure the power supply voltage is 12-30VDC.
Make sure the power supply is a DC input, not AC.
Emergency tones do not work:
Switch DIP1 switch 2 ON to activate emergency tones.
Specications
Power supply: ......................................................................12VDC to 30VDC 300mA (idle/maximum current draw 50mA)
Output: ...................................................................................................................................Stereo RCA 500mV nominal
MP3 sample rate: ......................................................................................................................................................44kHz
Micro SD Card size: ..............................................................................256MB to 16GB (not compatible with SDHC cards.)
Trigger Activation: .......................................................................................................................................Closing contact
MP3 info:
Length/size: ..............................................................Limited by card size (1600mins @ 128kbps, 44kHz on supplied 16GB)
Bit rate: ....................................................................................................All standard MP3 rates (128kbps recommended)
Sample rate: .................................................................................................All standard MP3 rates (44kHz recommended)
Channels: ...................................................................................................................................................Stereo or mono
* Specications subject to change without notice.
Distributed by Altronic Distributors Pty. Ltd. Perth. Western Australia. Phone: 1300 780 999 Fax: 1300 790 999
BCD POSITION
0
SWITCH-OVER
TIME (Sec)
OFF
130
260
390
4120
5150
6180
7210
8240
9270
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