G/01141E
Edition 1
27/04/2012
MD-4900CFA Handbook
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Operator Handbook for CFA Door Phone G/01141E Issue 1 Page
7
2.4 WIRING DIAGRAM FOR DOOR LATCH & SWITCHED OUTPUT MODE
POWER SUPPLY
FOR DC DOOR STRIKE
PIN 4
DOOR+
Open Collector Switch &
Isolation Circuit
PIN 3
DOOR-
10 - 30 V DC
2 Amps MAX
ELECTRIC
DOOR
STRIKE
-VE
+VE
+
-
HIDE-AWAY UNIT
+
Switched Output Mode
The ‘door latch’ switched output (open collector) and voltage free relay contact normally operate
only when
*5 is pressed by the person receiving calls
from the
Door Phone
(please note
that the voltage free relay contact requires external 12Vdc power – see note below about power
supply). Optionally, the open collector and relay contact can also operate when the
Door Phone
push button is pressed and the line is seized on an outgoing call. This mode can be used to
operate security cameras etc..
1.
Dial up the Door Phone (set for auto answer) from an independent telephone
2.
Wait for it to answer with a double ‘pip’ tone.
3.
Press *, enter your PIN (normally none), then press 601.
4.
Press 0 for both switched outputs to be activated only by DTMF *5, OR:
Press 1 for both switched outputs to be activated when button is pressed and an outgoing call
is in progress (DTMF *5 still works for activating the outputs on incoming calls), OR:
Press 2 for the relay to be activated when button is pressed, and the transistor output (DOOR
+, DOOR -) to be activated only by DTMF *5, OR:
5. Press 3 for both switched outputs to operate during an incoming call from the phone line.
6. Press # to store the setting.
Summary: <* [PIN] 601 [0, 1, 2, or 3] #>
2.5 PUSH BUTTON LIGHT
If a 12Vdc plug pack is connected to the unit, the Push Button light will illuminate permanently.
The push button is then visible in dark locations.
Please note
: Use only the factory recommended isolated dc power supply. Consult the factory if
you intend using another power source.
