Security Escort | Technical Reference Manual | 1.0 Security Escort
System Architecture
Bosch Security Systems | 6/12 | 38947D
The console in the security office
sounds an alert tone and displays the
alarm as usual except for a yellow
background and text advising that the
event is a silent alarm from a security
officer. This allows security personnel
to call for assistance without
attracting unwanted attention.
Maintenance Transmitter
The Maintenance Transmitter is used
exclusively for system set-up and
diagnosis. Maintenance alarms are used
during the system set-up to verify that
a receiver is functioning and is
properly identified in the Transponder
Database. The maintenance alarm is also
used to measure the received signal
strength of the receivers from any
location within the protected area. The
central console distinguishes the
Maintenance Transmitter by its unique
coded message and produces a printout
of the signal strengths reported by
receivers on each transponder.
In the Test Mode, the Maintenance
Transmitter behaves like a normal
Subscriber Transmitter except that the
central console does not verify the
user ID portion of the transmitted
code. Unlike the Subscriber
Transmitters, all Maintenance
Transmitters are assumed to be valid.
Point Transmitter
The Point Transmitter is used to
protect assets not people. It has a
magnetic reed switch and a supervised
loop that reports both open and shorted
states. The software can be programmed
to report alarms and troubles on any of
these conditions going off normal with
unique text identifying the condition.
These transmitters are supervised and
also optionally support the alarm
follower.
1.1.3 Receiver
The receivers are located throughout
the protected area, including building
interiors. Inside buildings, the
spacing of these devices depends on the
building construction and the locating
precision required. Outdoors, spacing
depends on terrain and foliage
conditions and building obstructions.
The procedure for location of receivers
is contained in The Security Escort
Installation Guide.
Each receiver contains a radio receiver
to detect the transmissions from
transmitters, and microcomputers to
decode and interpret the received test
and alarm messages. In addition, the
microcomputers monitor to detect
tampering, and report such conditions
to the transponder.
Each receiver contains a sounder
similar to those in self-contained
smoke detectors. These sounders are
optionally activated if the receiver
has detected an alarm transmission.
Indoor receivers are typically mounted
on inside walls. They are housed in
small beige, rectangular units. Indoor
receivers have one red and one green
light. The green light is used to
indicate a successful test of a
transmitter. The red light is only
illuminated during certain system tests
and during alarms.
Outdoor receivers are contained in
small weatherproof boxes typically
mounted on the sides of buildings and
on light posts. Outdoor receivers do
not have the visible red and green
LED’s. Outdoors, the strobe lights on
the alert units flash to acknowledge
successful tests.
In addition to its radio receiver, each
receiver also contains a transmitter
functionally similar to the hand held
transmitters. This transmitter can be
commanded by the central console to
transmit a test message to other nearby
receivers. This buddy checking is
performed periodically to verify that
the receiver sections of all receiver
units are functioning satisfactorily.
1.1.4 Alert Unit
An alert unit consists of two
components, a self-contained
strobe/siren unit and an electronic
driver unit. The latter may be housed
in either a metal indoor enclosure or
an outdoor enclosure (similar to the
outdoor receiver enclosure), depending
on the application. The strobe siren
units are always mounted in outdoor
locations. In addition to the function
of attracting attention in the event of
an emergency, the strobe unit is used
to acknowledge a successful test of a
transmitter.
