Viewing and Printing a Read Status
4. Read Status Operation
NFS-640 Operations Manual P/N 51334:B 10/03/2003
51
How to View Read Status for Event and Alarm History
Overview
The control panel maintains a History buffer of the last 800 events, each with a time and date stamp.
History events include the following:
•
All alarms, troubles and operator actions, such as: Acknowledge, System Reset, Signal
Silence, Drill, and Walk Test.
•
Programming entries (Program Change and Status Change, but not Read Status), along with a
number (0-9) indicating the programming submenu (for example, 0=Clear). For an example,
see Figure 34.
You can view events from the History buffer in two forms: by displaying all events (option 2,
HIST
=2) or
by displaying alarm events only (option 4,
ALARM
HIST
=4).
Note:
The History buffer contains 800 events total, including the alarm events that display for Alarm history. The
control panel generates Alarm history from the alarm events that exist in the 800-event History buffer.
How to View Read Status for Event History
Option 2 (
HIST
=2) lets you view the total number of events in the History
buffer (up to 800 events), then view each event in chronological sequence.
From the “Read Status” screen, press
2
, then press the
ENTER
key to display
the “Event History” screen. A sample of the Event History screen is shown
below:
Figure 32 Sample Event History Display
To display events in the History buffer, do the following:
•
Press the
NEXT
S
ELECTION
key to step through each event from the first entry (oldest event
first) in the History buffer, or
•
Press the
PREVIOUS
SELECTION
key to step through each event from the most recent entry in the
History buffer.
Note:
The
NEXT SELECTION
key will show the most recent event first, and then move to its normal function of
displaying the oldest events first.
A sample LCD display for a trouble event:
Figure 33 Sample Trouble Event Display
A sample LCD display for a Program Change event:
Figure 34 Sample Program Change Event Display
next event
previous event
The number of events in the History buffer
EVENT HISTORY START
EVENTS IN HISTORY: 550
Time and date of the event
Type of trouble
Type of event
TROUBL IN SYSTEM
GROUND FAULT
01:46P 071401 Sat
Message specifies the
Program Change option used
Type of event
Time and date of the event
PROGRAM CHANGE
5=ZONE LABEL CHG
01:51P 071401 Sat
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