Section II. THEORY OF OPERATION

TM 5-6350-264-14&P-11

NAVELEX EE 181-AA-OMI-120/E121 C-7359-60-1

T.O. 31S9-2FSS9-1-11

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

wiring board.

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

Monitor Module.

2-14