CBX800 INSTALLATION MANUAL 
26  
 
OTHER I/O 
 
Two further input signals and one output signal, are available on the CBX800 for readers that support them. 
 
These further input/output options are: 
  two optocoupled polarity insensitive inputs (Input 3 and input 4) 
  one optocoupled polarity insensitive output (Output 3) 
 
The connections are indicated in the following diagram: 
 
Pinout 
Function 
O3A  Output 3A  (polarity insensitive) 
O3B  Output 3B  (polarity insensitive) 
+V  Power Source – Other I/O 
I3A  Input 3A  (polarity insensitive) 
I4A  Input 4A  (polarity insensitive) 
-V  Power Reference – Other I/O 
I34B  Input 3B and 4B (common)  (polarity insensitive) 
I34B  Input 3B and 4B (common)  (polarity insensitive)