Security Escort Technical Reference Manual 1.0 Security Escor
System Architecture
EN 12
Multiple Alarms
Receivers can handle multiple separate alarm or test events at the same time. If the receiver’s event buffer is full but contains test events, it discards the test records in favor of an incoming alarm. Similarly, the transponder event buffer can hold multiple events and it also replaces test events with alarm events when its buffer is full.
To assure that simultaneous alarms are detected, the multiple identical packets sent by the transmitters are randomly spaced over approximately one second. Only one of the packets must be detected to produce an alarm. Thus a collision between the transmissions of two or more transmitters is virtually eliminated. In addition, unless the transmitters are in the same location, they detect different groups of receivers. The central console is capable of processing 30 concurrent alarms. When there is more than one active alarm, the central console displays data for the first to be received and also indicates the total number received and the identity of the individuals transmitting them. The operator can click on the name of an individual to see the data for a particular alarm.
1.2.2Test Sequence Transmitter
When the user of the Security Escort System activates a test transmission, multiple identical packets of digital data are transmitted. In this case, the digital data in the transmitted packets contain a test code rather than an alarm code.
Receiver
The receiver responds to a test transmission the same as to an alarm transmission by decoding the radio signals, and measuring signal levels.
Transponder Data Collection and Response
The transponder collects data on a test event in the same manner as for an alarm event, it does not command the LED (green for test confirmation) to flash until it has been commanded to do so by the central console. Transmitters not in the Subscriber Database, or in
the database, but disabled, do not receive a flashing green light or flashing strobe that would indicate a successful test.
Central Console Response
The central console responds to the report of a test from a transmitter by collecting the data from each transponder reporting the event, and recording the locations of the receivers that detected the transmission. In this case, however, it does not calculate a location estimate. It simply records the data on the primary and backup computers’ hard disks, prints the identity of the subscriber, date and time on the hardcopy printout, and displays generic test icons on the central console in positions corresponding to the locations of receivers hearing the transmission.
In the case of test transmissions from Security Transmitters or Watchman Transmitters, the central console determines the closest receiver to the transmission and creates a guard tour event which becomes a part of the Guard Tour Report.
Figure 3: Console Screen Showing test Icons
Operator’s Response
There is no response required of the operator in the case of a test transmission.
Bosch Security Systems 6/12 38947D
