Access/Secure Circuits (Status Module only)

TM 5-6350-262-14/9

NAVELEX 0967-466-9090

TO 31S9-4-32-1

the impedance detector. Consequently, its associated

6-4.

Access/Secure Circuits (Status Module

oscillator will be enabled causing the lamp driver to

only). See figure 6-2.

flash the lamps and indicating the new condition.

An access condition is represented by a

low impedance of 2K ohms or less and a secure

When the RESET/ACK switch is

condition is represented by a high impedance of 1OOK

momentarily depressed to the ACK position, the latch

ohms or more. When an access condition is being

corresponding to the input being received will not be

received, providing an acknowledgment has been made,

reset, but the remaining set/reset latch will be reset.

the ACCESS lamps will be on constantly and the

The resetting action of the remaining set/reset latch will

SECURE lamps will be off. The access set/reset latch

turn off its associated oscillator (output high) and its

will be set, keeping the access oscillator output low, and

lamp driver and lamps. It will also inhibit the oscillator

the SECURE set/reset latch will be set keeping the

corresponding to the condition being received so that

secure oscillator output high. With the access oscillator

the oscillator output will be low, keeping the lamp driver

output low, the access lamp driver and ACCESS lamps

and lamps for the received condition on constantly.

will be constantly on and the secure lamp driver and

Because one of the ACCESS/SECURE set/reset latches

SECURE lamps will be off.

is reset, the audible signal buss is disabled.

When a secure condition is being

6-5.

AC Power Circuit (Status Module only) See

received, providing an acknowledgment has been made,

figure 6-2

the SECURE lamps will be on constantly and the

When the ac power input status changes

ACCESS lamps will be off. The secure set/reset latch

from one state to the other, the AC POWER lamps will

will be set, keeping the secure oscillator output low, and

flash (four flashes per second) and the audible signal

the access set/reset latch will be set, keeping the access

buss will be activated until the condition is

oscillator off (output high). With the secure oscillator

acknowledged. Any change of input status will produce

output low, the secure lamp driver and SECURE lamps

an output from the impedance detector, setting set/reset

will be constantly on and the access lamp driver and

the latch. Once the latch is set the oscillator will be on,

ACCESS lamps will be off.

causing the lamp driver to flash the AC POWER lamps.

Whenever the access/secure input

If the RESET/ACK switch is momentarily

changes from one condition to the other, the indicator

depressed (ACK position), the set/reset latch will reset

lamps corresponding to the new condition will flash (four

and the oscillator will stop. If the impedance detector is

flashes per second), but the lamps corresponding to the

sensing a power off condition, its output state will cause

previous condition will remain constantly on. Because

the oscillator to be off (high output), turning off the lamp

both set/reset latches will be set, the audible signal buss

driver and AC POWER lamps. If a power on condition

will be activated. The set/reset latch corresponding to

is sensed, the output state of the impedance detector

the original condition was set previously and will be

will cause the oscillator output to be low, turning on the

unaffected by the change in input conditions. The

lamp driver and lamps constantly.

associated oscillator output will remain low and its lamp

driver and lamps will remain on constantly.

The

set/reset latch corresponding to the new condition was

previously reset but will be set by the output change of

6-7