The FCA module, provides RS232 or RS485 communication to either the FDX5000, FS2000 or the HOST PANEL. On the long side of the module is the ON/OFF Power switch, DB9M connector for connection to the FDX-5000 Panel, DB9F connector for PC connection via its Com Port and two screws Terminal Blocks for connection to RS485 loop. The five signal LEDs are placed on a front side.