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Low
Battery
Shutdown
The 7720V2 automatically shuts down if battery voltage drops below 9.45VDC volts,
and ALL LEDs WILL BE OFF. When the charging voltage is present and the battery
voltage rises above the 9.45VDC shutdown point, the 7720V2 will enter a BAITERY
CHARGING MODE and the RED LED will flash once per second. This mode continues
until the battery is sufficiently charged to support alarm conditions.
During
the
charging
cycle,
the
7720V2
will
not transmit
any
messages.
The 7720V2
will resume normal operation after the battery is fully charged.
General Operation
Alarm
Processing
The 7720V2 receives alarm and restore sianals from the alarm control r)anel and
LED
Indications
converts these signals to radio messages which are transmitted to the master station
network, which in turn relays the messages to the central station. The 7720V2 can
monitor 4 traditional zone inputs. The first two zones may be configured by jumper to
activate on either O volts or activate on 4.5-14.2VDC; zones 3 and 4 are hard-wired to
activate on 4.5-14.2VDC.
Zones 1-4 can also be programmed to invert their input
signals.
Upon detecting an alarm or restoral, the 7720V2 transmits the message to the master
station network.
The transmissions repeat for approximately 6 minutes (total of 60
messages) to ensure that the alarm or other report will be received by the central
monitoring station.
The 7720V2 periodically transmits supervisory status messages to the AlarmNet
network.
Radio faults that are indicated during the status messages may prevent
communication; to prevent this, the fault output can be programmed to also indicate
radio faults (programming the fault output is explained later in this chapter).
If no
messages are received during the supervisory window, the network generates a
communication failure signal to the central station.
A built-in radio fault contact closure can be used to locally indicate radio faults; this can
be either normally open or normally closed. In addition, it can be selected to be "fail-
safe" by programming the fault output to be inverted (i.e. the relay is powered unless
there is a fault). The radio fault output is labeled TB1 -10 and TB1 -11 on the terminal
strip, These terminals float with reference to the rest of the circuit.
The 7720V2 also provides status information via its serial port, thus allowing radio status
to be displayed on command, using either a 7720P Programming Tool of a computer
terminal. Refer to the TESTING THE 7720V2 section for information regarding the "S"
command and status messages.
LED
State
Meaning
GREEN
Flash
With YEL solid= Message transmission
YELLOW
Solid
Transmission cycle ON
Rapid Flash
Test or FAST message
(1O per second)
Slow Flash
Normal operation
(l/second)
Slower Flash
Normal, but low battery or DC charging condition
detected.
(1 per 3 seconds)
RED
Solid
Radio Fault detected
Pattern
See Flash Patterns Table
1 Flash/Second
Battery charge mode: will continue until the radio
senses that the battery is capable of supporting an
alarm cycle.
ALL LIT
Consecutive
Power On/Reset sequence. Repeated twice before
entering normal mode. Press [ENTER] during cycle
to enter Program Mode.
Slow Unison
Radio is not properly programmed. Will continue
(2 per
second)
until [ENTER]is pressedto enter programmingmode.
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