DB15P Input Connector Pin Assignments

 1 Channel 1 first LED
 9 Channel 1 first LED (electrically tied at opto coupler output to pin 1 circuit)
 2 Channel 2 second LED
 10 Channel 2 second LED (electrically tied at opto coupler output to pin 2 circuit)
 3 Channel 3 third LED
 11 Channel 4 fourth LED
 4 Channel 5 fifth LED
 12 Channel 6 sixth LED
 5 Input signal return (DC- or AC-)
 13 Not used
 6 Not used
14 Not used
7 Conflict signal output (Ground true)
15 +12 VDC power
8 Ground (+12 VDC return)