The model includes a 3 or 4 or 8 Amp power supply unit and incorporates 3 Serial ports (one RS232 and 2 TTL), and an extended 4 Mb memory. Comes with embedded software. The 3GS system can be built up to 200 zone inputs and 255 individually addressable outputs by the onboard I/O which can be increased with I/O Nodes. A maximum of 99 nodes can be added to the controller. 3GS can include Intruder Alarm, Radio P.A. and Paging, and Access Control in one network.