Bosch PT-400 User Manual download pdf (Page 10)

Security Escort | Technical Reference Manual | 1.0 Security Escort

System Architecture

EN | 10

Bosch Security Systems | 6/12 | 38947D

Figure 1: Screen Box for Password

Entry

Operations not accessible at a given

authority level appear in gray rather

than black on the central console. The

installation and maintenance portion of

the Security Escort Software is

designed to facilitate set-up and

modification of the system and to

provide rapid diagnosis of system

problems, usually with only one person

being required. From the central

console, simple commands can be used to

scan all devices on a particular

transponder for their current status.

Devices can be enabled or disabled from

the central console and the on-board

transmitter of one receiver can be

activated to test an adjacent receiver

in order to confirm that its radio

receiver section is operating properly

(buddy check).

The Security Escort Software also

continually monitors the status of each

transponder to insure it is functioning

correctly. All communications between

the central console and a transponder

require acknowledgments to verify

message integrity. Each transponder

must transmit a message periodically,

to assure the central console that the

transponder is still operating

properly. Should a transponder fail to

transmit either a routine status report

or any other message to the central

console, the central console sends a

query to the transponder requesting a

message be returned. If there is no

response after six attempts at

communications, a pop-up alert appears

on the central console.

1.2 System Operation

The following sections describe the

basic operation of the Security Escort

System during alarm, test, and various

other routine and emergency situations.

1.2.1 Alarm Sequence

Transmitter

When a user of the Security Escort

System activates an alarm with the

transmitter, multiple identical packets

of digital data are transmitted from

the hand-held transmitter to nearby

receivers. Each packet contains a

unique device identification code, an

alarm type indication, the transmitter

battery condition, and a check

sequence. Multiple packets are employed

to assure successful receipt of the

message by the receivers.

Receiver

The receiver is continuously listening

for radio signals that might be alarm

or test data from transmitters. If the

incoming message is determined to be

valid, representing either an alarm or

a test from a transmitter, the peak

amplitude of the received signal is

recorded.

Transponder Scanning

The transponder continually scans all

of its receivers to see if any of them

received a valid transmission. Once a

transponder determines that one or more

of its receivers received a

transmission, it directs a message to

those receivers, to determine the

specifics of the transmission.

Receiver’s Response

The receivers respond to these messages

with the identification code of the

transmitter that sent the alarm or

test, the alarm or test type, and the

amplitude of the signal received from

the transmitter.

Transponder Data Collection and

Response

The transponder next constructs a

message for the central console

containing the receiver addresses, for

all receivers responding to the event

and signal levels of the receptions,

the alarm or test type and the

transmitter identification number. The

transponder then verifies that the

communications channel is free and

transmits the information to the

central console. If the communication

channel is busy, the transponder delays

a random period of time and tries

again.

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