Simon Security System
12
For circuit supervision, which allows the panel to detect if the siren wire is cut (open), 
Option 53: Hardwire Siren Supervision must be turned on (see the “Programming” sec-
tion) and interior sirens must be wired with a resistor in the circuit.
LD105 Hardwire Interior Siren
Note  
Do not install the resistor at 
the panel terminals. This 
does not provide supervision 
of the wire.
Connect the LD105 Hardwire Interior Siren (13-374) to the panel using a 4.7k resistor 
(included with siren) as shown in Figure 4. The resistor must be connected across the 
siren wires as close to the siren as possible.
Note  
If you are installing only an 
interior siren and no exterior 
siren and Option 53 is on, 
you must connect a 4.7k 
resistor between the HWIN2 
and DCOUT terminals in 
addition to the resistor 
between HWIN1 and 
DCOUT shown in Figure 4.
Figure 4. Hardwire Interior Siren with Supervision
Wiring Exterior Sirens
Panel terminal HWIN2 can be used for connecting exterior sirens and activates when 
intrusion and fire alarms occur.
Exterior sirens can be wired with or without a resistor in the circuit for supervision. For 
circuit supervision which allows the panel to detect if the siren wire is cut (open), 
Option 53: Hardwire Siren Supervision must be turned on (see the “Programming” sec-
tion).
Hardwire Exterior Siren with Supervision
Note  
Do not install the resistor at 
the panel terminals. This 
does not provide supervision 
of the wire.
Connect the Hardwire Exterior Siren (13-046) to the panel using a 4.7k resistor 
(included with siren) as shown in Figure 5. The resistor must be connected across the 
siren wires as close to the siren as possible.
Note  
If you are installing only an 
exterior siren and no interior 
siren and Option 53 is on, 
you must connect a 4.7k 
resistor between the HWIN1 
and DCOUT terminals in 
addition to the resistor 
between HWIN2 and 
DCOUT shown in Figure 5.
Figure 5. Hardwire Exterior Siren with Supervision
H W I N 2
H W I N 1D C O U T
A C A C
Red
Black
4.7k Resistor
(located at sire
H W I N 2
H W I N 1D C O U T
A C A C
4.7k Resistor
(located at siren
Black
Red