Videx Security 25H, DDA User Manual

TECHNICAL MANUAL

One button DDA audio intercom kit

25H/DDA

TECHNICAL MANUAL
EDITION 1.1

INTRODUCTION

The door entry kit has the following features:

• Electronic call tone - Upon a call being initiated, the telephone will attract the attention of the occupant
with up to ten warbled rings.

• Timed door release - Upon pressing the door release button on the telephone, a dry contact relay within
the door panel will energise for 5 seconds.

• Visual indication of call progress on the door panel – In standby, the door panel call button will be
illuminated awaiting being pressed. Upon pressing the button, the illumination will begin to flash and
during the conversation and door release the button illumination will be off. Additionally three LED’s
indicate when the telephone is ringing (Red LED), when to speak (Yellow LED), and when the door is
open (Green LED).

• Call tone volume adjust – The volume can be adjusted using a three position volume control located on
the telephone.

COMPONENTS

The standard components of the kit are as follows:

• Door panel (VR1N/DDA) - A one button vandal resistant flush fitting door panel with large
illuminated call button with raised letters and Braille.

• Audio telephone (3111) – A white ABS plastic wall mountable telephone with three position
call tone volume adjust, door release button and spare service button.

• Power supply (521) – A 13.5Vdc DIN rail or wall mountable power supply unit capable of
supplying up to 800mA continuous or 1A surge.

CONNECTIONS

DOOR PANEL

AMPLIFIER

1 Receive speech from telephone (12Vdc on hook, 4Vdc off hook)
2 Transmit speech to telephone (12Vdc on hook, 1Vdc off hook)
3 Positive supply to amplifier (12Vdc)
4 Negative (0V) supply to amplifier

BUTTON

SW Normally open switch
SW Other side of normally open switch
LAMP One side of button illumination +12Vdc
LAMP Other side of button illumination (Switched 0V)

CONTROL PCB

5 Door release from telephone (Switched negative from 5Vdc)
4 Call tone out to telephone
Tr Trigger from call button to initiate a call (Triggers on 12Vdc)
2 Handset lift detect line (12Vdc on hook, 1Vdc off hook)
Gnd 0V from power supply
+12 12Vdc from power supply
CO Common connection of dry contact lock relay
NO Normally open connection of dry contact relay
NC Normally closed connection of dry contact relay

Speech volume adjustments are carried out at the door panel using a small trimmer driver.

Adjustment for speech

volume level at the door

station

Adjustment for speech

volume at the apartment

PAGE 2 25H/DDA TECHNICAL MANUAL VER1.1

TELEPHONE

Art.3111

The Art.3111 includes a three position call tone volume control, lock release push
button and spare dry contact push to make button for other services. Up to three
telephones can be connected in parallel on this system.

CONNECTIONS:­ Function

4 Call tone in from door panel
6 Not used on this system
2 Receive speech from the door panel
1 Transmit speech to the door panel
3 0V
5 Switch 0V lock trigger command
8 Dry contact switch
9

POWER SUPPLY

Art.521

The 521 PSU can supply 800mA constant or a 1A surge. The
output is 13.5Vdc and is protected by a fall back circuit (No
internal fuses on either the primary or secondary of the PSU. A
fused spur should always be used with this type of PSU).

BLOCK DIAGRAM AND DOOR PANEL DIMENSIONS

PAGE 3 25H/DDA TECHNICAL MANUAL VER1.1

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