ADEMCO 7845CZ, Installation And Setup Manual

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7845CZ Installation and Setup Guide
7–4
validation is a low-priority message. When the 7845CZ receives the validation from
AlarmNet, the yellow LED resumes a normal blinking pattern. If the 7845CZ does not
receive a validation within 90 seconds of a successful transmission, it retransmits the alarm.
The 7845CZ continues 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 7845CZ resumes normal operation. When the zone restores, if zone
restoral has been programmed, the restoration message is transmitted and the validation is
received with the same LED patterns. Refer to Table 8 for LED patterns.
If an alarm is not successfully transmitted before the old alarm time expires, the radio fault goes to
its programmed fault state and the red LED lights.
Any time a transmission is unsuccessful, the red LED rapidly flashes for a short period of
time and the yellow LED remains lit. The 7845CZ automatically attempts retransmission of
the alarm within 10 seconds. The radio continues to retransmit until it is successful, unless
a radio fault has been generated (the red LED lights).
Radio Supervision
The 7845CZ transmits periodic supervisory and status messages to alert the network that it
has communication integrity. The supervision period (window) is a programmable feature
(see Programming Section). If, during the supervisory window, AlarmNet Control Center
fails to receive a message, a communication failure signal is routed via RF to the appropriate
AlarmNet–A or AlarmNet–M equipped central station.