Elenco Electronics MO-1251 Manual de usuario descargar pdf (Pagina 33)

100

tection, or medical

supervision. Vir-

tually every feature- including

the

function

and operation of

the

loops

well

automatic battery testing -is

under full -time microprocessor

con-

trol. For

example, the microprocessor

controls a digital telephone

dialer for

central- station

communications;

built -in two -tone /steady siren

driver

for intruder,

panic, and fire protec-

tion; the time

delay of the protective

loops;

and the time delays for the

en-

try doors. It will

even flash an outdoor

strobe continuously after the

alarm

automatically resets to

warn

that an

intrusion had been

attempted, and

that the

intruders

might

well

be inside

the house

even though the alarm bell/

siren has timed -out.

Typical of the

control centers offering Napco's

price /function

level, the center can be

controlled via one

or more keypads,

and the

user -desired functions -even

the dialer's

telephone number(s)

-are

programmed

in a PROM

by the in-

staller, or manufacturer.

EOLR

The Napco

900 center,

which

typical of the most

recent PROM de-

signs, provides

EOL supervision

through a resistor, which

is called an

EOLR for End

Line

Resistor. Fig-

ure 4 shows

the basic generic circuit

of a supervised

EOLR loop.

The

loop control provides

voltage

into the loop that results in

about 8-

mA of current

flow

when

the EOLR

resistor

is connected to the

end of the

loop. The loop

control is triggered by

anything

that causes the loop

current

vary

substantially

above or below 8

mA. As you

can see, if the loop is

broken

at any point, or if it is short-

circuited in

front of the EOLR,

the

loop

control will trigger

the bell /siren

control, which

causes the alarm

bell

or siren to sound.

Super -tech

The most

advanced of the high -tech

home systems

-with an "advanced"

price to match -is

represented by the

Morse MDC

-16 Control

Commu-

nicator

System,

which

includes the

MPC

-32

-D

Personal

Control.

Basically,

the control center

does ev-

erything

that a PROM -type

control

center

can do, only more so. There

are

protective circuits,

several armi-

ng modes, individual

password

codes

for different

protected areas and

users,

selectable

transmission

schemes for

various

central stations

receivers, and

CONTROL CENTER

RECEIVER

LOCAL -

LOOP

VOICE

SYNTHESIZER

- TO

TELEPHONE

LINE

XTR

FIRE

XTR 5

REMOTE

CONTROL

FIG. 7 -IN

A WIRELESS

SECURITY SYSTEM the loop and emergency conditions are

broadcast to

receiver

in the

control center. Once a day the control center automatically

broadcasts

a polling

signal

each

transmitter

to check the condition of

the transmitter's

battery.

zone trouble reports. There's even lis-

ten-in capability through a telephone,

such as for a central station to check

on a "medical" signal.

But most important, unlike less

ex-

pensive high -tech panels that are pro-

grammed through a PROM "burn"

by the installer or the manufacturer,

the Morse panel uses non -volatile

EEPROM

user

programming

that al-

lows

any feature to be changed at any

time from the

personal

control,

which

is shown in Fig.

Notice

that the personal control

shown in Fig. 5 has a two -line alpha

display, which provides

cues for user

programming or indicates various op-

erating conditions. For

example, Fig.

5 shows that all zones are normal and

the system is ready for

arming. If the

loop

that protects Pop's

workshop

open, the

condition

will

be alpha -dis-

played

as "POP'S ROOM." The per-

son attempting to

arm

the system

would

thereby know precisely which

loop is open.

High -tech

sensors

Of course, no panel

will

work un-

less there

are

sensors. While

the most

common

sensors are some form

switch -even

foil

strip is a nor-

mally- closed switch

-we also use

some

high -tech witchcraft

to avoid the

use of

hard

-wired switches. For ex-

ample, there are infrared, ultrasonic,

and

microwave devices that flood a

wide

area

with

unseen light, unheard

sound, or radio waves. Any

distur-

bance to the light, sound, or radio

field triggers the alarm. Unfor-

tunately,

many

of the "flood"

devices

can be triggered by household pets,

curtains blowing, and the like.

Simply because

it's relatively low

in cost

and easy

to install, the high -

tech sensor most

commonly

used in

the home is the PIR detector -PIR

meaning Passive InfraRed. A PIR de-

tector, uses either a

segmented front

lens,

or a combination segmented

lens and mirror segments behind the

lens to focus sensitivity on particular

areas or angles of coverage.

Optional

lenses for many PIR's optimize sen-

sitivity for many different conditions,

such as long side hallways, alcoves,

lofts, etc.

Nightingales

sing

A somewhat unusual sensor for

home use is

the electronic

nightingale

floor. Back in antiquity,

Sultans,

Pas-

has,

and other despots protected their

harems and treasuries with a specially

continued on page 69

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 99 100

Comentarios a estos manuales

Sin comentarios

Elenco Electronics MO-1251 Manual de usuario Pagina 33

Comentarios a estos manuales