NFS-320/E/C, NFS-320SYS/E Operations Manual — P/N 52747:E1 06/16/2011 55
Presignal and Positive Alarm Sequence (PAS) Operation Special Zone Operation
A.4.3 How to Respond to an Alarm with Coding
If an alarm occurs with a Coding selection, the control panel latches the control panel in alarm and
pulses outputs mapped to F8 at the pulse specified by the Coding selection (see
Table A.4). To
silence the outputs, press the SIGNAL SILENCE key.
A.5 Presignal and Positive Alarm Sequence (PAS) Operation
A.5.1 Overview
This section describes the Presignal and PAS selection, and provides instructions on how to do the
following:
• View Presignal and PAS selections
• Respond to an alarm with Presignal
• Operate the control panel with a Presignal Delay Timer only
• Operate the control panel with a Presignal Delay Timer and PAS
A.5.2 What is Presignal and PAS?
Presignal is a feature that initially causes alarm signals to only sound in specific areas, monitored
by qualified persons. This allows delay of the alarm from 60 to180 seconds after the start of alarm
processing. The control panel Presignal feature provides two selections:
• A Presignal Delay Timer (60-180 seconds) that delays activation of all outputs with a CBE that
includes Special Zone F0.
• A PAS selection, in addition to the Presignal Delay Timer, that allows a 15-second time period
for acknowledging an alarm signal from a fire detection/initiating device. If the alarm is not
acknowledged within 15 seconds, all local and remote outputs activate immediately and
automatically.
An illustration of Presignal and PAS timing.
Figure A.7 Presignal and PAS Time
NOTE: Presignal differs from the Alarm Verification Timer which does not require human
intervention.
Initial alarm
annunciation
Alarm activates outputs,
if panel is not reset.
If PAS=Y, alarm activates
outputs if not acknowledged
PAS (15s)
Presignal Delay Timer (60-180)
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