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Normal Operation
With the 7835C installed, programmed, and registered, and after a successful transmission of the Power on
Reset message, the 7835C enters normal operation.
messages pending, the yellow status LED will flash in one of two patterns indicating the operating carrier.
• Yellow flashing once per second indicates no alarm messages are pending and that the 7835C is
connected to a cell being operated by the "B" side carrier.
• Yellow flashing twice rapidly, then a pause every second, indicates no alarm messages are pending and
the cell that the 7835C is in contact with is operated by the "A" side carrier.
Refer to Table 6 for all LED patterns
Note that at any point during operation, the red LED will go on solid when contact with the cell has
been lost. The 7835C will automatically attempt to regain contact with the cell. If contact is not
regained before the programmed radio fault time, the radio fault relay will change state, sending a
radio fault to the panel. Refer to Table 6 for all LED patterns.
Transmitting an Alarm
While in normal operation, triggering any zone or reception of a valid ECP message will initiate the
transmission of an alarm. The yellow status LED will light solid, indicating a message pending. The green
LED will flash rapidly 8 times when the alarm message has been successfully transmitted. The yellow LED
will begin to flash rapidly, indicating the 7835C is waiting for a message validation from AlarmNet Control.
This may take several minutes to receive, since the validation is a low priority message. When the 7835C
receives the validation from AlarmNet, the yellow LED resumes its normal blinking pattern. If the 7835C
does not receive a validation within 90 seconds of a successful transmission, it will retransmit the alarm. The
7835C will continue to retransmit an unvalidated alarm once every 90 seconds until the message is
validated, or the "old alarm time" has expired. If the message is not validated, the alarm is removed and the
7835C resumes normal operation. When the zone restores, if zone restoral has been programmed, the
restoration message will be transmitted and the validation will be received with the same LED patterns.
Refer to Table 6 for LED patterns.
If an alarm is not successfully transmitted before the old alarm time expires, the radio fault relay will
go to its programmed fault state and the red LED will go on solid.
The red LED will flash 8 times and the yellow LED will remain solid any time a transmission is
unsuccessful. Additionally, the bar graph LEDs will display an error code (refer to the diagram below). The
7835C will automatically attempt retransmission of the alarm within 10 seconds. The radio will continue to
retransmit until it is successful, unless a radio fault has been generated (the red LED lights solid on). Refer
to Table 6 for LED patterns.
1
2
G
radio
status
Y
display
R
bar graph
possible
error codes
Transmit Error Codes as Displayed on the Bar Graph
(Note: Green Radio Status LED is lit, indicating an unregistered radio)
Radio Supervision
The 7835C periodically transmits supervisory and status messages to alert the network that it has
communication integrity. The supervision period (window) is a programmable feature (see Question 5). If
no messages are received by the AlarmNet Control Center during the supervisory window, a
communication failure signal is routed via RF to the appropriate AlarmNet–A or AlarmNet–M equipped
central station.
3
4
5
...
...
send data failure
no MicroBurst service
radio busy
radio disabled
– 29 –
Normally, with good cellular coverage and no
6
step
1. normal
2. message pending
3. Tx fail
4. message pending
5. Tx good
6. return to normal
LED Key:
on
off
blink rapid
blink
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