Parts Identifications
PAGE 3
LS4808 / LS4816 | 8 / 16 CHANNEL SPEAKER LINE SURVEILLANCE
When line monitoring is initiated either manually or auto, it shall start in sequence from ch.1 to 16. With each channel
under monitoring, a dry contact shall be available. This shall provide 24V overriding voltage to volume controllers or
local patch panel with overriding relay, thus allowing direct measurement to the speakers. (Refer to Connecting the
unit section of the manual). Overriding is required for accurate sensing in which volume controllers set in various
position shall have different impedances and such circumstances shall provide false alarm or alert.
Recommended practice is that every zone shall have its own 24V overriding circuit back to the rack. If all the
overriding circuits are looped, and if the particular zone with volume controller is set to off, the monitoring activity shall
cause a burst of audio signal (such as BGM), which lasted for approximately 18 seconds. This shall happen only
when a BGM source is presence. If the particular zone is set to OFF (without BGM), the monitoring activity shall not
emit audible sound.
7. ZONE TRIGGER OUTPUT PORT
It is for connections of incoming 100V line signal and output to speakers. Refer to Connecting the Unit in following
section.
8. AMP / ZONE IN - OUT PORTS
Whenever a fault condition is detected, this port shall provide a dry contact to link to external alerting devices, such
as mimic panel, etc.
9. OUTPUT FAULT CONTACT
Event triggered data shall be transmitted with RS485 protocol.
10. RS485 OUTPUT (OPTIONAL)
