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OPERATION
GENERAL: The 7720 receives alarm and
restore signals from the alarm control
panel and converts these signals to radio
messages which are transmitted to the
master station network, which in turn
refays the messages to the central station.
The 7720 can monitor either 4 traditional
zone inputs, or can process serial data
from panels which use either ACP or ECP
data formats. For traditional zone inputs,
the first two zones may be configured by
jumper to activate on either O volts or
activate on 4.5-12VDC; zones 3 and 4 are
hard-wired to activate
on 4.5-12VDC.
Zones 1-4 can also be programmed to
invert their input signals.
Upon receiving an alarm, restore, or status
message,
the 7720
will transmit the
message to the master station network
after a programmed delay of either 250
milliseconds
or
16 seconds.
The
transmissions will repeat for approximately
6 minutes (total of 60 messages) to ensure
that the alarm or other report will be
received by the central monitoringstation.
The 7720 transmits peridIc
supervisory
messages to alert the central station to
system problems. A contact closure is
avaifabie to indicate a radio fault; this can
be either normally open or normafly closed.
In adcMin, it can be selected to be "fail-
safe" by programming the fault output to be
inverted (i.e. the relay is powered unfess
there is a fauft). The fauft output is between
TB1-1 and TB1-2, whii
float with reference
to the rest of the circuit.
The 7720 also provides status information
via its serial port, thus allowing radio
status to be dispfayed on command, using
either a 772oP Programming Tool or a
computer terminal. Refer to the TESTING
THE 7720 section for information regarding
the "S command and status messages.
ANTENNA:The
7720 can use either the
supplied wire antenna, or, by using the
optional 7720ANT connector I@ can use a
7625 omnidkectional antenna, 7625-MB
antenna (if additional gain is required), a
7674
or 7674-13
YAGI
antenna
(if
directional
antenna
is required).
The
supplied antenna mounts directly to the
7720. The other antennas can be mounted
remotely (if desired) using pm-assembled
coaxial cable availabie from ADEMCO (5',
12' or 25' lengths).
LOW
BATTERY
SHUTDOWN:
If
battery voltage drops below 9.75 volts, the
7720 will automatically shutdown, and ALL
LEDs WILL BE OFF. When the battery is
recharged to 10.25 volts, the LEDs will
begin to flash in rapid unison (see LED
table), until the battery is charged to 12.5
volts. During
the
charging
cycle,
the
7720
will
not
transmit
any
messages. The 772o will resume normal
operation after the battery is fully charged.
.E1
m
- RN
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—
INDICA
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S(JM
Rapid Flesh
;1 O/second)
Slow Flesh
II/second)
Slower F leet
[1per3 sac)
sold
Pattern
Consecutlvs
w
Unison
(lo/second)
slow lMsotl
(2/sacond)
IONS
MEANING
WithYELsdld. Message
transrmssion
With
YELflashiW = HS
antennatest
Transmission q lcle ON
Testor FASTmessage
Normaloperation
Normal, b utlowMt. orDC
Ch@J
condtiondetectec
Radio
Faultdetected
SeeFlashPatterns Table
Powerorl/Rese[sequence.
Repeated twce before
entering normal m ode.
Press~NTER] during cycle
toenterProgram Mode.
8atterynotfullycharged.
Repeated aboutonceevery
2 seconds untilbattery is
charged to12.5vDc.
Radii is notproperly
programmed. WIIIcontinua
until [ ENTER]ispressed to
enterprog ramming mode.
s
transmission
5
S-L-L-S
VSWRisbed
~
I
#-Fautt codenumber.See "S commandin the
TESTINGTHE ~20 sectionforadditional s tatus
. .
.
I
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