Table 2-1. Operator Controls and Indicators

TM 5-6350-264-14&P-8

NAVELEX EE181-AA-OMI-090/E121 SA-1954

T.O. 31S9-2FSS9-1-8

Table 2-1. Operator Controls and Indicators

Controls and

Function

indicators

Alarm switch

Provides an alarm signal output when actuated.

NOTE

After an alarm has been responded

to, notify appropriate direct sup-

port maintenance personnel to

reset the LAS to a no-alarm

condition.

Alarm indicator

LED comes on when alarm is actuated;

goes off when alarm switch is reset.

Section II. THEORY OF OPERATION

age is applied to one side of the latching relay. With the

2-3. FUNCTIONAL DESCRIPTION.

latching relay operating and latched, the closed latching

relay contacts provide a continuous signal path and

a. The LAS permits authorized personnel to manually

return path through an LED. The indicator light (LED),

activate an alarm signal to the J-SIIDS Control Unit

on the front of the LAS comes on red and remains on as

when the security of an area is threatened. The LAS

long as the duress alarm signal is present. The indicator

chassis cover contains a tamper switch that also

light goes out when the reset switch is pressed and the

activates an alarm signal when the cover is

LAS returns to the no-alarm state.

removed from the housing by inch (0.635 cm) or

more. See figure 2-2 for a simplified functional

(2) Duress alarm reset. When the duress alarm

block diagram of the LAS.

switch is actuated, the alarm signal and the alarm

b. The LAS has four operational modes as follows:

indicator light will remain on until the reset switch is

duress alarm, duress alarm reset, tam-per alarm,

pressed. When the reset switch is pressed, voltage is

and no alarm.

applied to the other side of the latching relay which

restores the relay contacts to the no-alarm condition.

(1) Duress alarm. When an operator actuates the

duress alarm switch, the low impedance across TB1-1

(3) Tamper alarm. When the cover is moved from

and TB1-2 is changed to a high impedance which is

the chassis by 1/4 inch (0.635 cm) or more, a tamper

used as the duress alarm signal output. When the

alarm switch on the inside of the cover activates a

duress alarm switch contacts open, volt-

tamper alarm signal. When the cover

2-2