Installation Guide and Operating Manual 
 
 
Honeywell       17 
 
CAUTION – WARNING 
 
When the switches SW1, 
SW2, or SW3 are changed, 
the Detector’s input power 
must be cycled OFF, then 
ON, in order for the 
change(s) to be accepted.   
  Eight (8) position DIP Switch (SW2) – Figure 3-2 
 
   
 
Use the following tables to configure the Detector: 
 
Alarm Relay  SW2-1 
        
Latching  ON              
Non-Latching  OFF              
          
 
Sensitivity Levels  SW2-2  SW2-3 
    
 Very High (4) ON ON          
 High (3) ON OFF          
  Medium (2)  OFF  ON          
 Low (1) OFF OFF          
          
 
 Auxiliary Relay SW2-4 SW2-5 
  
 
 
No Verify Time  ON  ON       
 
 
5 Sec Verify Time  ON  ON      
 
 
10 Sec Verify Time  OFF  ON       
 
 
20 Sec Verify Time  OFF  OFF       
           
      
EOL Resistor  SW2-6 
 
     Enabled  ON  
      Disabled  OFF    
          
       
Alarm Relay  SW2-7 
 
Factory default settings are shown with a gray background.  Energized  ON   
        De-Energized  OFF  
          
         
Fault Relay  SW2-8 
*If the Fault Relay to set to “De-Energizied”, the Detector will not 
report any faults due to loss of input power to the Detector. 
  Energized  ON 
 De-Energized*  OFF 
 
 
 
 
Analog and digital outputs are available 
in addition to relay outputs.  Select from 
two (2) analog outputs or two (2) digital 
outputs using a ten (10) position Rotary 
Switch (SW3).  FireBus
II is the factory 
default setting.  Use Table on the right 
and Figure 3-3 to configure SW3. 
 
Position 
Output Selection 
 
 
0  4-20 mA Sink 
 
 
1  4-20 mA Source 
 
 
2 RS-485 Modbus 
 
3 
Factory Use Only 
 
4  RS-485 FireBusII 
 
5  Factory Use Only  
 
6  Factory Use Only 
 
 
7  Factory Use Only 
 
Figure 3-3 SW3 
8  Factory Use Only 
 
      Ten (10) Position Rotary Switch  
9  Factory Use Only 
 
During a fire, model FS24X-911-24-5 
detectors will alarm in non-latching 
mode and will unlatch when the fire 
decreases.  If the condition persists 
and begins to grow, the detectors will 
re-alarm. 
Note: 
 
The Medium and Low Sensitivity ranges are not approved as compliant with the requirements of EN 54-10:2002.