Videophones are available with door open button and spare services button.
Other options may be available on request.
The heart of the system is the sentry 1 control PCB, which has the following
features :-
12V DC operation
3
Voltage free contacts for the lock outputs. (Double pole 5A 30VDC)
3
Timed calltone, speak time and lock open time :-
3
CALLTONE LENGTH
SW1
SW2
TIME
ON
OFF 1 SECONDS
OFF ON
2 SECONDS
OFF OFF 4 SECONDS
ON
ON
8 SECONDS
SPEECH LENGTH
SW3
SW4
TIME
ON
OFF 16 SECONDS
OFF ON
32 SECONDS
OFF OFF 60 SECONDS
ON
ON
120 SECONDS
LOCK OPEN TIME
SW5
SW6
TIME
ON
OFF 2 SECONDS
OFF ON
8 SECONDS
OFF OFF 16 SECONDS
ON
ON
40 SECONDS
Timeclock input
3
Trade button input
3
Busy light output
3
Engaged output (for use with multiple door systems)
3
Additionally, if video is required on the system an ART893/20 power supply
will be required. This power supply will supply a 20V DC output to both the
videophones and the camera and will be fitted within the control cabinet.
Operation :-
A call will be activated by a visitor pressing the desired flat number on the
door panel. A timed call tone will be heard at the occupants telephone. The
videophone will also switch on at this point for the flats with the video facility).
A reassurance call tone will also be heard at the door panel to indicate the
system has been activated. If the occupant does not answer the telephone,
the call will clear down. If the occupant does answer the telephone, the call
tone will stop as soon as the handset is lifted. A two way conversation can
now take place (This will time out after the preset time). If the occupant does
not want to let the caller into the building, the handset would be put back on
its cradle. If the occupier does want to let the caller into the building, the lock
button would be pressed and the door would open for the preset time. The
lock button will not work at any other time.
The trade buttons only works when the time clock is active. At this time when
a trade button is pressed the door will open for the preset time.
