HOW SLC fire alarm Modules
Send Signals and gets Power at
the same Pair of Conductors
Introduction
Usually any device connected to Main or (Control Panel )
needs the following Points of connections:
+
Positive Power Supply Source
-
Negative Power Supply Source
A
Data+/-
B
Data+/-
True Alert Fire
alarm siren and
strobe
Above Wiring indicates the basic wiring method for any device, lines of POWER not the same lines of DATA.
e
Power Or Data uses the Electrons
of conductor to pass from side to
another side.
e
e
e
This electron Can be charged due to change in state
(1 or 0 ) so it now used to send a data message
SLC
Signaling Line Circuit
OR
This electron Can be charged due to change in state
of power Supply
Module in Devices and Control Panels Make it possible to use
only two wires for Powering Devices and For Communication
between Module and Control Panels.
Positive Power Supply Source
the Conductor electrons cant carry the data and the power at the
same time
+/A
Data+/-
-/B
Negative Power Supply Source
Data+/-
Here another concept applies but with the
same concept of electrons in conductor.
X
e
e
e
e
Data Electrons
The module works with very smart and fast way
Firstly it sends the power on the two wiring conductors (+,-)
so the module (of Siren for Example) is powered and active
e
e
e
e
Power Electrons
e
e
e
e
In case of communication(sending Data) the Module Cuts off
the power to send Data on the Conductor Taking advantage
of RC circuit in the Siren Module that Save power for
(milliseconds).
Data Sent to siren in (000 and 111) in milliseconds so the
module don't get down due to the saved power in RC circuit
RC
Finally the Panel Cut off the Stream of Data and supply the
Siren Module with Power
REF:https://www.douglaskrantz.com/QFHowDoYouInterruptPowerOnTheSLC.html