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SILK SCREEN 24 COMM. PORT FAULT 25 LOGIC INPUT FAULT 26 LOGIC OUTPUT FAULT COLOUR INDICATION (WHEN LIT) FURTHER INFORMATION Yellow Hardware / RS 485 serial port (for linking to a fire alarm system) fault. This indication depends on either a broken / short-circuited cable or no data transmission (for example, due to a damaged serial port) or remote device unavailable. Yellow GPI fault. The LED gets lit when the logic input is monitored and its respective line is open or shorted. A logic input (GPI) needs to be monitored when linked to a fire alarm system (to activate pre-recorded messages remotely). Yellow GPO fault. The LED gets lit when the logic output is monitored and its respective line is open or shorted. A logic output (GPO) needs to be monitored when linked to a fire alarm system (for example, to signal an audio system fault to the fire alarm system). ENGLISH No. 27 MP3 player SD card slot. 28 USB port (type A) for USB flash drives (MP3 player). 29 MONITOR: 6.3 mm jack input (TRS) for headphones. 30 PC LINK: USB port (type B) to connect a PC that can be used to configure and manage the system. 31a Internal loudspeaker (monitor). 31b Internal buzzer for fault alert (or evacuation message in progress). It can be muted by pressing the SYSTEM ON 1 button. 15