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Redback A 1741 Operating Manual

Message player
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Operating Manual
A 1741
Message Player
The A 1741 is an MP3 based message player and tone generator designed for public address, security, customer direction
or emergency evacuation announcements.
1.0 Installation
Power requirements: The A 1741 needs a minimum of 12VDC at 300mA to work correctly. 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 the 2.1mm (tip positive) DC socket on the rear of the unit (see fig 1).
Output: Output is via the stereo RCA connectors on the rear. 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 on the rear of the unit whether by a normally open
switch or a timer or controller. (Note: These triggers have a common ground).
Trigger Switches: The messages can also be activated by pressing the switches on the front of the unit. Note: The Alert
and Evac buttons must be held down for 3 seconds before they activate. This reduces the chance of accidental triggering.
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 1741 is powered by 12V, the switched output voltage will be 12V.
2.0 Play modes
Alternate: When the A 1741 is in Alternate mode (DIP1 switch1 OFF) (see Fig 3) 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 continue to loop over and over until the contact is released.
Momentary: In Momentary mode (DIP1 switch1 ON) (see Fig 3) a momentary closing contact or pulse on the trigger pins
will activate the MP3. The A 1741 will continue to play the MP3 till it finishes and will stop playing and wait for another
trigger activation.
To stop an MP3 playing when in Momentary mode the Cancel trigger or Cancel switch is used. A momentary closing
contact on the Cancel trigger or closure of the Cancel switch will stop the MP3 playing (it is recommended that the Cancel
contact or switch be held up to 2 seconds to ensure the MP3 stops playing)
User manual revision number 1.3 26/05/2015

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Summary of Contents for Redback A 1741

  • Page 1 Momentary: In Momentary mode (DIP1 switch1 ON) (see Fig 3) a momentary closing contact or pulse on the trigger pins will activate the MP3. The A 1741 will continue to play the MP3 till it finishes and will stop playing and wait for another trigger activation.

  • Page 2: Front Panel Connections

    This LED indicates whether the unit is ON or has a Fault condition. If the LED is “steady blue” the unit is receiving power. If the LED is “flashing red” then a fault has occured with the unit. Power Switch Used to turn the unit On or OFF. Redback® Proudly Made In Australia...

  • Page 3: Rear Panel Connections

    The switched output terminal is triggered when any message or tone is activated. The output voltage is the same as the power supplied to the unit. ie if the A 1741 is powered by 12V DC, the switched output voltage will be 12V DC.
  • Page 4 The Alert tone comes with a change over option which forces the A 1741 to switch from the Alert to the Evacuation tone after a prescribed time. DIP switches 5-8 set these change over times from 30 seconds to 450 seconds in 30 second intervals.
  • Page 5 6.0 Putting MP3’s on to the Player You will first need to remove power from the A 1741 then remove the SD card from the front of the unit. To remove the SD card push the card in and it will eject itself.
  • Page 6 NOTE the new MP3 file cannot be “Read only” to check this right click on the MP3 file and scroll down and select Properties, you will get a window that looks like figure 9. Make sure the “Read Only” box has no tick in it. Fig 8 Redback® Proudly Made In Australia...
  • Page 7 2.0 and the Dip Switch settings. The Alert tone comes with a change over option which forces the A 1741 to switch from Alert to the Evacuation tone after a prescribed time. Use DIP switches 5-8 to adjust this time or switch off completely (see Fig 4).

  • Page 8: Troubleshooting

    Length/size: ........ Limited by card size (800mins @ 128kbps, 44kHz on supplied 8GB) Bit rate: ..............All standard MP3 rates (128kbps recommended) Sample rate: ............... All standard MP3 rates (44kHz recommended) Channels: ........................Stereo or mono * Specifications subject to change without notice. Redback® Proudly Made In Australia...

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