The Smart-Line 020-4 EXT is a development of the 4 zone Smart-Line 020-4 conventional fire alarm control panel. It offers 1 Smart-LetLoose/ONE extinction channel and all the functions of the Smart-Line 020-4 conventional fire alarm control panel. The Smart-Line 020-4 EXT can be interfaced with analog-addressable fire alarm control panels from the Smart-Loop series in order to furnish them with fire-extinguishing functions. Interfacing is achieved through the RS 485 connector on-board the Smart-Line 020-4 EXT. In this way, the Smart-Line 020-4 EXT can be programmed to activate its functions on the basis of à¢localà¢?Â information (conventional zones, start-extinction terminals, stop extinction terminals, etc) and on the basis of à¢re-moteà¢?Â information coming from the Smart-Loop control panel.