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Redback® A 1720C MP3 Tone Generator
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. If there are multiple MP3 files in the trigger folder, a file will be
selected at random and played once.
4.0 Cancel Function
As outlined in the Alternate Playback mode, the cancel trigger can be used to cancel any activated trigger. The A 1720C
now includes a new function, which when configured can play an MP3 file on cancellation of a trigger, in Alternate
Playback mode only. On the micro SD card is a folder labelled "cancel" and inside this folder are the alert, evac and trigger
folders. To configure the unit for MP3 playback on trigger 3 cancellation for example, an MP3 file must be placed in the
trig3 folder (location K:\cancel\trig3).
5.0 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. Set DIP switch 2 to ON to activate the emergency tones.
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 outlined in section
3.0. The Alert tone comes with a change over option which forces the A 1720C 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 figure 6). Power down the A 1720C
for the changes to take effect.
Evacuation: The Evacuation tone is activated by a closing contact on the Evac
trigger (Trigger9) and can be used in Alternate or Momentary setup as mentioned in
section 3.0.
Alert and Evacuation messages: A message can be inserted every three alert
cycles and/or every three evac cycles. Refer to section 2.3 for more details.
Priority: The Emergency tones have priority over other triggers (1 to 8) and if
activated will stop any other MP3, and activate the selected emergency tone.
Evacuation also has priority over Alert.
6.0 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.
7.0 Specifications
Power supply: ......................................................................12VDC to 30VDC 300mA (idle/maximum current draw 50mA)
Output: ...................................................................................................................................Stereo RCA 500mV nominal
Micro SD Card size: ....................................................................................................................................256MB to 32GB
Trigger Activation: .......................................................................................................................................Closing contact
MP3 info:
Bit rate: ....................................................................................................All standard MP3 rates (128kbps recommended)
Sample rate: .................................................................................................All standard MP3 rates (44kHz recommended)
Channels: ...................................................................................................................................................Stereo or mono
Switched Output Current Draw: ............................................................................................................. 200mA Maximum
Distributed by Altronic Distributors Pty. Ltd. Perth. Western Australia. Phone: 1300 780 999 Fax: 1300 790 999
4
Redback® Proudly Made In Australia
* Specifications subject to change without notice.
BCD POSITION
SWITCH-OVER
TIME (Sec)
0
OFF
1
30
2
60
3
90
4
120
5
150
6
180
7
210
8
240
9
270
Fig 6.
www.redbackaudio.com.au
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