AT&T System 75 8520T User Manual download pdf (Page 88)

Use

with

the

Earlier Version CCU Main

Board and Display Control Keypad

The earlier version of the CCU Main Board and

the earlier Display Control Keypad provide more

limited Listen-In/Talk-Back capability. If the

monitoring service supports Listen-In/Talk-Back,

you can turn it ON with

Fn#236

and 246 (not for

use in UL Listed systems). The Listen-In/Talk-

Back feature allows bi-directional (either listen or

talk at any given moment) phone operation after

an alarm has been received, and one-way listen

in after a silent panic (duress). Listen-in is active

at all Display Control Keypads in the user’s

system.

The monitoring service has 90 seconds after kiss-

off to activate Listen-In/Talk-Back by sending a

touch-tone “1” from their phone. Then, the

listen-

in operation continues for 60 minutes, or until

ended by either the user or the service. The

service can end the operation by sending a

touch-tone “2,” and the user can end it by termi-

nating the alarm (changing to the OFF Level of

Protection).

Built-in level sensing mutes constant-level noises

so that refrigerators, fans, etc. do not drown out

other keypads on the premises.

The Alarm Cycle

When a sensor signals the CCU that it has been

violated, the CCU determines if that violation

should result in an alarm (or cause a chime, tone,

or nothing). This is based upon the programming

from the function numbers in the 400 and 500

series. If an alarm is called for, the CCU deter-

mines if the alarm should be instant or delayed. If

the alarm is delayed, the process of calling the

monitoring service is also delayed. If the alarm is

instant, any local operations and the process of

phoning the monitoring service begin immedi-

ately. In accordance with its programming, the

CCU: activates its relays, signals the X-10 device

which (if any) of its switches to activate, activates

the siren(s) with the selected cadenced or

no-

cadenced power, initiates the selected alarm

signals from the keypads, begins the phone

reporting process to the monitoring service(s).

Phone reporting process begins with a 0 to 90

second delay before placing the call

(Fn#212).

Then the system tries to place the call. It waits for

the dial tone 1 to 16 seconds

(Fn#213)

and dials

the selected receiver number. If the CCU is

successful in phoning in the alarm, the phone

process is complete. If the process is not suc-

cessful (no dial tone, failure at the monitoring

service) the system will wait for the retry delay

(Fn#215)

and then try again. The second try may

be on the second phone line (if used,

Fn#217

and

114),

or may be to the second monitoring service

receiver (if used, Fn#114). The system will make a

maximum of 5 tries per line, for each receiver.

Local alarms will continue until removed by the

user, or siren time-out. In the event of the user

removing the alarm, the system may send the

monitoring service a

restoral

(Fn#313,

314).

Resetting the System

Resetting the “system” is actually resetting the

CCU’s computer. This will erase the system’s

memory of sensors, keypads, users, and the

event history (regardless of current conditions*).

This memory loss includes access codes (In-

staller/ Dealer and User). Upon reset, the system

is returned to the factory-set defaults (listed for

most data in Chapter 3, all 9’s for Installer access

code, and 1234 for User access code).

*You cannot reset the system when it is in the Suspend

Operation condition. To reset the system, press and

release the small Reset button on the CCU Main board

(location shown in Figures 2-4 and 2-5).

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AT&T System 75 8520T User Manual Page 88

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