5-4 Operation 
SG 2000 Installation and Operation Manual   
A Override 
The SG2-LIDB overrides the status monitor or manual control board signal and activates receiver A 
as illustrated in Figure 5-5: 
Figure 5-5  
A override 
Status monitor
signal
Receiver enable
logic
JP2
+5V
 
Status Monitor/Manual Control Operation 
The SG2-LIDB enables the status monitor or manual control board to activate receiver A or receiver 
B as illustrated in Figure 5-6: 
Figure 5-6  
Status monitor/MCB operation 
Status monitor
signal
Receiver enable
logic
JP2
+5V