By handling all audio processing, communication and control functions entirely digitally, Praesideo achieves hihg levels of flexibility and ease of installation. Initial system configuration is carried out quickly and easily from a PC with user-friendly configuration software, eliminating the need for programming at the equipment end or complex, time-consuming changes in the system cabling when upgrading or expanding. The configuration software uses web-based technology, and allows authorized users to access and monitor the system from any location. After the system configuration the PC can be disconnected and Praesideo can work without a PC.
Praesideo’s digital technology also provides virtually unlimited zones, call stations, audio inputs and outputs, control inputs and outputs and much more. Built-in TCP/IP protocol as well as a standard RS232 interface makes the system open for interconnection with other systems and peripherals. As well as the system’s own call stations and storage functions for pre-recorded announcements, audio inputs can be accepted from virtually all other sources.
Praesideo uses a ‘daisy-chain’ network topology that allows units to be located at any point on the network. External interfaces for control inputs and outputs - for example call stations, sensors and relay contacts - can be placed wherever they are needed on the network. Additional network branches can be added at any time. The modular approach allows users to start with a small system in the initial stage, and later expand it simply by adding extra system units where and when they are needed. The system includes continuous monitoring of all units by the central network controller and also meets requirements for fireman’s call stations.
The Praesideo’s Network Controller acts as the heart of the system, storing all control information and configuration settings and providing the TCP/IP interface for connection to the PC to enable configuration as well as diagnostic and logging functions. The controller also stores the pre-recorded digital audio messages for automatic announcements, and it monitors all the system components and reports any changes in status. The controller has audio inputs and outputs, as well as control inputs which can trigger an action or actions (macro) in the system and control outputs which can initiate external actions. The system has a choice of four types of power amplifiers ranging from 1 x 500W to larger 8 x 60W.
(Ruth Rossington)
