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

4 5

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.

Specications

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

* Specications subject to change without notice.