Com3/Com4 Ri Pin Voltage Select (J3, J4) - Aaeon PCM-6890B User Manual

COM3/COM4 RI pin voltage select
(J3, J4)
The 9th pin of COM3 and COM4 (9-pin D-sub connector) can be
selected as RI, +5V, or +12V by setting J3 & J4.
COM3 RI pin setting (J4)
J4
COM4 RI pin setting (J3)
J3
*default
18 PCM-6890B User Manual
RI*
1 3 5
2 4 6
RI *
1 3 5
2 4 6
+5V
1 3 5
2 4 6
+5V
1 3 5
2 4 6
+12V
1 3 5
2 4 6
+12V
1 3 5
2 4 6