NAVELEX EE 181-AA-OMI-120/E121 C-7359-60-1
Section II. THEORY OF OPERATION
2-3. Functional Description.
The Monitor Cabinets and Status Monitor Modules interface directly with the Control Unit via hard-wire
interconnecting lines, or a Data Transmission System. The Data Transmission System can use either a
single-pair transmission line, or dedicated, voice-grade telephone lines. Status and mode of operation of
secured areas are continuously displayed on the Status Monitor Module. There are six different status and
mode of operation conditions which are displayed by means of four pairs of status lights. The lights are
labeled SECURE, ACCESS, AC POWER, and ALARM. The no-alarm condition is indicated by absence or
flashing of AC POWER lights. Each change of status is accompanied by the flashing light associated with the
new state and the sounding of an audible signal until ACKNOWLEDGE switch is momentarily depressed.
When this switch is depressed, the flashing light associated with the new state changes to a continuously
illuminated light, except for ac-fail and no-alarm status conditions, and audible signal is silenced.
The Monitor Cabinet provides primary and emergency power to Status Monitor Modules. The cabinet
contains a Signal Module which consists of an audible signaling device and a logic subassembly printed
wiring board. The signaling device is actuated by the Status Monitor Module or logic subassembly printed
Signal Module lamps are continuously on when Monitor Cabinet is operated on external ac power. If cabinet
is operated by emergency power, lamps are extinguished. When external ac power to the Monitor Cabinet
fails for more than 3 seconds, or when ac power is reapplied to Monitor Cabinet after having failed, lamps will
begin to flash and the audible signaling device will be actuated. When ACKNOWLEDGE switch is
momentarily depressed, and ac power is absent, flashing lights will go to continuously off and audible signal
device will be silenced. When ACKNOWLEDGE switch is momentarily depressed, and ac power has been
restored, lights will go to continuously on and audible signal will be silenced.
Emergency power supply is sufficient for 24 hours of operation for single-zone cabinet, 20 hours of operation
for five-zone cabinet, and 12 hours of operation for twenty-five-zone cabinet. Status Monitor Modules
interface with the Monitor Cabinets by means of plug-in connectors. The modules have an additional
connector for interfacing with the Data Transmission System. Status information may be transmitted between
the Control Unit and Monitor Cabinet by the Data Transmission System. The Data Receiver plugs into Status