cause of the transmitter actuation is a supervisory signal as defined
by NFPA 72.
Note (3): Low battery, low power, and power failure messages shall be
displayed as required by NFPA 72.
Each network shall include a means for the operator to manually reset
(clear) its display. If the display is not reset at the time additional
alarm(s) or supervisory signal(s) are received, the additional alarm(s) and
supervisory signal(s) shall be retained in the memory and a distinctive
audible or visual indication given to the operator that additional messages
are waiting to be acknowledged. A minimum of 16 such messages shall be
retained for display and acknowledgement. Alarms shall be printed
immediately upon receipt. Supervisory signals shall have priority over
trouble signals and shall be clearly distinguishable in compliance with
NFPA 72 on the visual display and printout.
2.6.2
Memory
Provide each network with a programmable non-volatile memory capable of
retaining 500 transmitter codes together with their specific messages,
total number of zones possible, and related information associated with
each of 500 transmitters. Memory shall be used in comparing received
signals with pre-programmed "legitimate" transmitter codes, and shall cause
the rejection of any signal containing a code not programmed into memory.
Memory shall also maintain an account of automatic transmitter testing and
transmitter trouble and low battery/low power/power failure transmissions
as required by NFPA 72.
Access into the memory for the purpose of making
additions or deletions shall be restricted to the system administrator by
the use of a key switch or access code to prevent unauthorized changes.
Stored information shall not be lost in the event of a total loss of
primary and emergency power supplies.
2.6.2.1
Memory Readout
Upon manual activation by the operator, the each network shall print a
summary of transmitters which have transmitted a trouble (or low
battery/low power/power fail as required by NFPA 72)signal, or which have
failed to transmit a signal during the previous 24-hour test period. Any
legitimate incoming transmitter signal shall preempt the memory read
function, and take control of each network.
2.6.3
Digital Clock
Provide each network with an electronic digital clock. The clock shall
display the current time expressed in 24-hour time and date (day and month)
and shall transmit to each interconnected decoder and printer the time and
date that signals are received. Provide a means for resetting the clock.
2.6.4
Printer
Provide printers of high speed, computer compatible, low noise design,
which are capable of printing messages associated with all incoming
signals, with no messages being lost. Upon reception of an alarm, each
printer shall print the required visually displayed data, including the
date and time received. Paper for recording messages shall be standard
size, and commercially available printer (computer) or adding machine,
continuous feed type. Paper take-up devices for storing print-out shall be
included. Alarms shall be printed in a manner to make them readily
SECTION 13853N
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