Digital systems
We
make our own range of microprocessor based, digital call panels. The digital panel can
also be used to provide access control of the entrance door using the
panel buttons with a programable secret number.
A
large clear l.e.d. display shows the user the number being called and a
busy light allows multiple entrances on one system. Audio/visual
panels also usually have long lasting halogen lamps to illuminate the
caller to the camera.
Construction
Various materials can
be selected for the panel that is constructed using 12 s.w.g. (3mm.) gauge
metal. This can be satin polished, stainless steel, polished brass,
bronze or coloured aluminium. Its size is dependant upon
application and can be adjusted to suit the site. Audio only panels
have four corner holes to allow them to be face-fixed to a backing box,
using vandal resistant screws, or they can be back-fixed. Components
to the rear of the face plate are affixed with welded steel studs.
The number view window
is constructed of marl resistant polycarbonate, stud fixed to the front
panel and further laminated with a red diffuser, providing back engraved
"BUSY" legend.
The control/input
buttons are each constructed of solid stainless steel and rise above the
panel surface to provide feel for poor sighted people. The buttons
have a steel back check to protect the push switch fitted to the rear of
the assembly. Push switches may be replaced without removing the
assembly. There are no sharp protrusions or components on the
surface of the panel.
L.E.D. display
The bright light
emitting diode display has 20mm. high characters and is viewed through the
lamination of polycarbonate lens and red diffuser.
Busy display
The wait display is
illuminated via five standard red L.E.D.’s, which illuminate the back
engraved "BUSY".
Compatible
The digital outputs
from this unit use a dual nibble, binary addressing system. Blakeglow
produces a range of decoders.
Programming
Two levels of
programming are necessary. The first, burnt into the EPROM, provides
the operating system for the panel and also an address map of the site's
decoders. The address maps are generally unique for each site.
The second level of
programming is done by the commissioning/servicing engineer and provides
control of lock release time, panel
set time, panel call time, panel
call tone and rate, time of day, and
trade times from the panel buttons without the need to remove the panel.
In the absence of this
programming, the unit operates on factory standard setting. Access is
limited to the commissioning/service engineer.
General functions
The panel can provide
automatic switch-off of call tone when calls are answered, automatic
multi-entrance control via a single control highway, audible confirmation
of button depression for poor sighted, lock release tone emitted while the
lock is energised and also the following functions in addition to
those listed under programming.
Electrical supplies
battery back-up
The panel has an
internal battery, which maintains the RAM memory in the event of loss of
supply, thereby maintaining the commissioning programme.
Panel supply is from a
single rail of 12V.d.c. and is suitable for systems with battery back up.
The system power
supply unit can provide all the supplies necessary for not only the
telephones or audio/visual units but also for the locking device on the
access door.
Decoders
The 16 way decoder
units can be with or without secrecy circuits
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