Cmos Setup (J7); Com3/Com4 Ri Pin Setting (J20, J21) - Aaeon PCM-5894 User Manual

COM3/COM4 RI pin setting (J20, J21)

The COM3 and COM4 can supply +5V or +12V power to the
serial devices via RI pin of the COM port connector. The outputs
of COM3, COM4 RI pins are selected by setting J20, J21.
COM3 RI pin setting
J20
COM4 RI pin setting
J21

CMOS setup (J7)

CMOS setup
J7
* default setting
34 PCM-5894 User's Manual
RI*
5
6
3
4
1
2
RI*
5
6
3
4
1
2
Protect*
+5V
5
6
3
4
1
2
+5V
5
6
3
4
1
2
Clear CMOS
+12V
5
6
3
4
1
2
+12V
5
6
3
4
1
2