Honeywell International Inc. 7720PLUS Manuale Utente
Section1. System Features and Operation
1-3
Programmable Features
The 7720PLUS utilizes EEPROM (Electrically Erasable Programmable Read Only Memory)
technology that allows the 7720PLUS to be programmed with a 7720P Programming Tool.
The programming options include:
technology that 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), and
• open/close/restore reporting channels.
• Telco channel assignments for fault input
• inverted trigger inputs
• delayed reporting channels (1-127 seconds delay, if selected), and
• open/close/restore reporting channels.
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.
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 by an AC wall transformer, part number (1324), which provides
12VAC 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.
12VAC 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 tests its battery under 200mA load approximately every 4 hours. During this
test, the 7720PLUS notifies the central station of a low battery condition if the battery
voltage drops below 9.93V (
test, the 7720PLUS notifies the central station of a low battery condition if the battery
voltage drops below 9.93V (
± 5%). Low battery restore messages are reported during
successive tests if the battery voltage reaches 10.03V (
± 5%). During an AC failure condition,
the periodic battery test is not performed, but the battery voltage is tested during each
regular transmission, and a detected low battery condition is transmitted as described. A
radio configured for ECP reports the battery status to the control panel as well as to the
central station (most current controls do not annunciate this condition unless it occurs in
conjunction with a more serious fault).
regular transmission, and a detected low battery condition is transmitted as described. A
radio configured for ECP reports the battery status to the control panel as well as to the
central station (most current controls do not annunciate this condition unless it occurs in
conjunction with a more serious fault).
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 138VAC at the wall outlet, the radio will operate properly,
regardless of the condition of the battery.
automatically shutdown and all LEDs will be off. However, so long as there is AC power, in
the normal range of 102 to 138VAC 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 control panel and converts these
signals to radio messages. These messages 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. (Zones normally are activated when
the signal goes to a positive voltage. Inverting the zone trigger means that the zone is
activated when the signal goes to ground. The pull-up voltage for zones 1 and 2 can be
supplied by changing a jumper. Pull-up voltage for any of the zones can be supplied from the
radio through external resistors or from a control panel.)
signals to radio messages. These messages 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. (Zones normally are activated when
the signal goes to a positive voltage. Inverting the zone trigger means that the zone is
activated when the signal goes to ground. The pull-up voltage for zones 1 and 2 can be
supplied by changing a jumper. Pull-up voltage for any of the zones can be supplied from the
radio through external resistors or from a control panel.)