Simplex 4004 User Manual

5-3
States - The state of an IDC is determined by the physical condition of the
wiring and devices connected to the terminal block. There are four states
associated with an IDC:
• Short (0-200 ohms).
• Current-limited state (400-820 ohms), across the initiating device
circuit.
• Normal state (defined as the end-of-line resistor in place with the full
range of line resistance and detector load).
• Open circuit state (defined as the absence of the end-of-line resistor,
with or without a detector load).
Style B - A method of connection for IDC that provides a trouble indication in
the event of an open circuit on the wiring loop (also known as Class B).
Style C/Style E - An IDC point type. A trouble indication is provided if a short
(plus to minus) or open circuit condition exists on the wiring loop. An alarm is
initiated if a “current-limited” state exists. Style C is two-wire, Style E is four-
wire.
Style D - A method of connecting initiating devices on IDCs that provide
multiple signal paths so that circuit operation is maintained with a single open
circuit connection. A trouble indication is provided in the event of an open
circuit on the wiring loop (also known as Class A).
Style Y - A method for connecting notification appliances on NACs that provide
a trouble indication in the event of an open circuit on the wiring loop
(also known as Class B).
Style Z - A method of connecting notification appliances on NACs that provide
multiple signal paths so that circuit operation is maintained with a single open
circuit connection. A trouble indication is provided in the event of an open
circuit on the wiring loop (also known as Class A).
Supervisory Signal - A signal indicating the need of action in connection with
the fire suppression system or equipment, or with the maintenance features of
related systems.
Temporal Code - A three coding pulse pattern adopted by NFPA as a standard
evacuation pattern for audible notification. The pattern consists of three,
0.5-second pulses, each pulse separated by 0.5-second silence. Each group of
three pulses is separated by 1.5-seconds of silence.
VSMOKE - A point type that is selectable for an IDC. This point type initiates
an immediate alarm from a contact closure Pull Station or Heat Detector, but
initiates the Alarm Verification sequence (see definition above) for a
current-limited alarm. A point configured as VSMOKE must not have any
devices other than smoke detectors that initiate a current-limited alarm.
Zone - A defined area within the protected premises. A zone may define an area
from which a signal can be received, an area to which a signal can be sent, or an
area in which a form of control can be executed.
Glossary of Terms (Continued)

Simplex 4004 Specifications

General

Brand	Simplex
Model	4004
Category	Smoke Alarm
Language	English