4. Read Status Operation Viewing and Printing a Read Status
44 NFS-640 Operations Manual P/N 51334:B 10/03/2003
How to View Read Status for a Detector
From the “Read Status” screen, press 0, then press the
ENTER key.
You can now view Read Status for a detector as follows: press
DETECTOR, enter the SLC number followed by the three digit
address, then press the
ENTER key. For example, to read the status
of detector 1D002: press
DETECTOR, enter the SLC number (1),
enter address 002, then press the
ENTER key. The control panel
now displays information about the detector, as shown below.
The display and descriptions of the fields are shown below:
Figure 21 Sample Detector Read Status Display
• Device Status The status of the detector: Normal, Alarm, or Test.
• Type Code The software Type Code that identifies the type of detector. (Refer to “Point
Programming” in NFS-640 Programming Manual.)
• Default CBE Zone Selection This is the first zone in the 5 zone CBE list. Defaults are Zone
001 (Heat detectors) Zone 002 (Ion detectors) Zone 003 (Photo detectors) Zone 004 (Laser
detectors) Zone 005 (Multisensor). Values may differ depending on point programming.
• Current alarm reading (xxx%) The current alarm reading of the detector, as a percentage of
the alarm sensitivity setting.
• Alarm sensitivity level (Ax) The alarm sensitivity (x=1-9) entered in the Detector Sensitivity
Screen.
• Pre-Alarm sensitivity level The Pre-Alarm Sensitivity (1-9; 0 = Pre-Alarm not used) entered
in the Detector Settings Screen.
Note: Refer to “Detector Sensitivity Settings” in the NFS-640 Programming Manual for more information on the
Pre-Alarm and Alarm Sensitivity settings
• Cooperative Multi-Detector selection A smoke detector programmed to evaluate readings
from nearby detectors in making Alarm or Pre-Alarm decisions. Cooperative Multi-Detector
sensing also allows the combination of ionization with photoelectric technology in reaching an
alarm decision.
* – Multi-not used.
A – combines the detector’s alarm decision with the next SLC address above.
B – combines the detector’s alarm decision with the next SLC address below.
C – combines the detector’s alarm decision with the next SLC address above and the next SLC
address below.
• Alarm Verification (* or V)
* – Alarm Verification not programmed for this detector.
V – Alarm Verification enabled.
Alarm Verification is a user-defined global time function that can reduce the number of
nuisance alarms. Refer to page 38 for more information.
• Device SLC Address The SLC address of the detector.
SLC number followed by three
digit address
next device
previous device
Type Code
Alarm Verification selection:
V on; * off
Multidetector selection:
A, B, C, or * (not selected)
Label for the detector
Current alarm reading (percent)
Alarm sensitivity level
Pre-Alarm sensitivity level
Device status
SLC Address (001-159)
D (detector)
SLC number (1 or 2)
NORMAL SMOKE (ION) INTENSIVE CARE UNIT
EASTERN WING Z002 001%A6 6 CV00 1D002
Default CBE zone selection
Alarm Verification Time
(in seconds)
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