– 5 –
the fault output is explained later in this chapter). If no messages are received during the supervisory
window, the network will generate a communication failure signal to the central station.
Available in zone mode only is a contact closure used to locally indicate a radio fault. 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
fault output is between TB1-11 and TB1-12, which float with reference to the rest of the circuit.
Also available in zone mode only is the ability for the 7720PLUS to provide status information via its
serial port, thus allowing radio status to be displayed on command, using either a 7720P
Programming Tool or a computer terminal. Refer to the TESTING THE 7720PLUS section for
information regarding the “S” command and status messages.
LED Indications
LED
State
Meaning
GREEN
Flash
With YELLOW solid = Message transmission
YELLOW
Solid
Rapid Flash
(10 per second)
Slow Flash
(1/second)
Slower Flash
(1 per 3 seconds)
Transmission cycle ON
Test or FAST message
Normal operation
Normal, but low battery condition detected.
RED
Solid Pattern
Radio Fault detected. See flash patterns table below.
YELLOW
and RED
Flashing in unison
Loss of communications between the radio and the
control panel. (ECP mode only)
All
illuminated
Consecutive
Slow Unison
(
2 per second)
Power On/Reset sequence. Repeated twice before
entering normal mode. Press [ENTER] during cycle to
enter Program Mode.
Radio is not properly programmed. Will continue until
[ENTER] is pressed to enter programming mode. (IF in
ECP mode, radio must be rebooted before entering program
mode)
