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10
en | Security Escort system architecture
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.
2.2.3
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.
The alert unit has back-up battery power in addition to AC power. The alert unit driver
contains a microprocessor, which communicates with the transponder for strobe and siren
commands, status reports, and trouble indications. The troubles monitored are tamper, loss of
AC power, and low battery.
2.2.4
Transponder
The transponder is a device controller for up to 64 devices; any combination of receivers and
alert units. The devices are connected to the transponder by means of 8 four wire multiplex
busses: two wires for power and two wires for data. Each bus is capable of supporting up to 8
devices. The Security Escort System supports up to 255 transponders.
Each receiver and alert unit is identified to its transponder by a multiplex address that is set
during system installation using a multi-position switch on the receiver or alert unit circuit
board. Transponders communicate on the data bus with individual multiplex devices by
issuing commands, which contain the receiver or alert unit's multiplex address. Note that a
given transponder may have up to eight devices with the same binary multiplex address, one
on each bus. Thus, the complete identification of a particular device must include the
transponder with which it is associated (1 to 255), the bus on which it is located (0 to 7), and
its binary multiplex address (0 to 7).
When a receiver or alert unit detects a reportable event (alarm, test, tamper, loss of AC
power, and so on) it goes into an "off normal" state. To quickly locate any devices which might
be in the "off normal" state, global commands (which are interpreted simultaneously by all of
its devices) are issued by the transponder approximately ten times per second. These global
commands are followed by commands to specific devices to determine the nature of the "off
normal" condition and, in the case of an alarm or test, to obtain the Transmitter Identification
Number, Transmitter Battery Condition, and Received Signal Strength. This information is
used by the Central Console to identify the subscriber transmitting the alarm (test) and
determine the subscriber's location.
2.2.5
Central Console
The Central Console consists of one to eight IBM PC compatible computers running the
Security Escort software within the Microsoft Windows® environment. One computer serves
as the main controller for the entire Security Escort System (the master computer) and a
second serves as an optional backup (the slave computer). The other computers serve as
workstations for the operators of the software. The slave and workstation computers can be
used for administrative functions such as adding subscribers or performing routine system
tests without interfering with the operation of the master computer.
2019.08 | V2.18.1.6 | DOC
Technical Reference Manual
Security Escort
Bosch Security Systems B.V.
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