| High Security Alarm Applications
Because of their very nature it is not normal practice to publicize details of high security alarm applications. The PACSNET 3000 Equipment has been extensively tested and approved for such applications. Further details are available on request.
Standard Fire and Security Systems
PACS has a tradition of design and installation of secure reliable radio data networks in a wide variety of applications and sites.
One particular application is the monitoring of remote locations around perimeter fences or scattered buildings back to a central location either for environmental monitoring or security or often both.
This particular use of the equipment takes advantage of the speed of response of the system as well as its ability to confirm satisfactory operation or failure for any reason. These features come from the structure of the PACSNET Real Time Network Software, which is used in the units in such a system.
The Master station controls the use of the radio channel using a high speed polling technique to address every station and send and receive messages with each station in turn. This allows very fast response times for large numbers of outstations. It also guarantees the system knows immediately any failures occur or if any elements of the network have been interfered with either physically or over the radio channel.
Data from the master station database may either be sent locally to external devices or retransmitted over the radio network to another station where all the data is recreated into another database. At any location, data can be exported either via a serial link or by recreating the signals for connection by hard wiring to a PC or physical display system.
It is possible to use one of the other PACSNET networks for similar applications where units only transmit when an alarm or change of data occurs. This offers a marginally better response time from alarm or change of state occurrence at an outstation to receipt at the master station.
The downside is that the only method of detection of interference or unit failure is by a time-out arrangement, which according to size of network might be up to 30 minutes or more. This network is therefore only used when the time constant of the variables being monitored is very long and it is not suitable for fire intruder or high security network applications. It is ideal for simple equipment alarm monitoring applications, particularly where power consumption is at a premium. |
