IBM PCM-6890B, All-in-One FC/Socket 370 Celeron manual COM3/COM4 RI pin voltage select J3, J4

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)

	RI*			+5V		+12V
1	3	5	1	3	5	1	3	5
J4
2	4	6	2	4	6	2	4	6
COM4 RI pin setting (J3)
	RI *			+5V		+12V
1	3	5	1	3	5	1	3	5
J3
2	4	6	2	4	6	2	4	6

*default

18 PCM-6890B User Manual