REDBACK
®
®
A 1720A MP3 Tone Generator &
Message Player Module
Operating Instructions
The A 1720A 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 1720A 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 2 way
terminal block (see fig 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 1720A is powered by
12V the switched output voltage will be 12V.
Play modes
Alternate:
When the A 1720A is in Alternate mode (DIP1 switch1 OFF) (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 continue to loop over
and over until the contact is released.
Momentary:
In Momentary mode (DIP1 switch1 ON) (see fig 1) a momentary closing contact or pulse on the trigger pins will activate the MP3. The A
1720A 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 is used. A momentary closing contact on the Cancel trigger will stop the MP3
playing (it is recommended that the Cancel contact be held up to 2 seconds to ensure the MP3 stops playing).
Putting MP3’s on to the player
You will first need to remove power from the A 1720A then remove the SD card from the front of the A 1720A. To remove the SD card push the card in
and it will eject itself.
The SD card will then need to be connected to a PC (Windows XP or Vista recommended). You will need a PC equipped with a SD card reader to do
this (not supplied).
Step by step guide to put a MP3 into Trigger1 with Windows XP installed PC
Step 1:
Make sure the PC is on and card reader connected and correctly installed. Then insert the SD card into the reader.
Step 2:
Go to “My Computer” (figure 2) and open the SD card which is usually marked “Removable disk”. In this case it is named “Removable disk (G)
FRONT PANEL
1. Stereo audio output
2. Left & right RCA outputs
3. Switched power output
4. Trigger 1-8 inputs
5. Evac input
6. Alert input
7. Cancel input
8. SD card slot
9. DIP switch
10. BCD switch
11. Power input (12-24VDC)
Figure 1.
4
1
-
Left
+
-
Right
+
8
7
6
5
10
- +
11
2
3
9
