Table of Contents
Advertisement
coax (P/N 7626-5), 12ft coax (P/N 7626-12), 25ft coax (P/N 7626-25HC), and 50ft coax (P/N 7626-
50HC).
Programmable Features
The 7720PLUS utilizes EEPROM (Electrically Erasable ROM) technology, which allows the
7720PLUS to be programmed with a 7720P Programming Tool. The programming options include
radio frequency channel number (1 to 14), Telco channel assignments for fault input, inverted trigger
inputs, delayed reporting channels (1-127 seconds delay, if selected), open/close/restore reporting
channels, etc.
Self -Diagnosing Transmitter
Malfunctions of the transmitter, including antenna fault, radio transmitter fault, loss of external
power, and low internal DC voltage can be displayed on the 7720P programming tool or reported on
the ECP interface, as well as being transmitted to the master station, if the fault does not prevent
such transmission. Faults can also trigger contact closures on a Form "C" relay to indicate radio
faults.
Power Supply
The 7720PLUS is powered byan AC wall transformer, part number (TBD), whichprovides 12 volts AC
to the radio on pins 1 and 2 of the terminal block. An internal rechargeable battery provides power to
the radio in the event of AC power outage. This battery is charged from the AC power supply during
normal operation of the radio.
Low Battery Monitoring
The 7720PLUS will notify the central station of a low battery condition whenever the battery voltage
drops below 9.93V (+/- 2%). Low battery restore messages are reported "" when the battery voltage
reaches 10.03V (+/-2.5%). A radio configured for ECP will report the battery status to the control
panel as well as to the central station.
Low Battery Shutdown
In the absence of AC power, if battery voltage drops below 9.45 volts, the 7720PLUS will
automatically shutdown and ALL LEDs WILL BE OFF. However, so long as there is AC power, in the
normal range of 102 to 138 VAC at the wall outlet, the radio will operate properly, regardless of the
condition of the battery.
General Operation
The 7720PLUS 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 relays
the messages to the central station. The 7720PLUS can monitor 4 traditional zone inputs or an ECP
signal line from an appropriate control panel. The first two zones may be configured by the use of a
jumper, to activate on either 0 volts or 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 the sense of their input signals.
normally are activated when the signal goes to a positive voltage. Inverting the zone trigger means
that the zone will be activated when the signal goes to ground. The pull-up voltage for zones 1 and 2
can be supplied by changing a jumper, if desired; pull-up voltage for any of the zones can be supplied
from the radio thru external resistors, or from an alarm panel.)
Upon detecting an alarm or restoral, the 7720PLUS will transmit the messages to the master station
network.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 monitoring station.
The 7720PLUS periodically transmits supervisory status messages to the AlarmNet network. Radio
faults that are indicated during transmissions may prevent communication; to prevent this, the fault
output (available in zone mode only) can be programmed to also indicate radio faults (programming
– 4 –
(Zones
Advertisement
Table of Contents
