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18 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)
RI* +5V +12V
J4
COM4 RI pin setting (J3)
RI * +5V +12V
J3
*default
1 3 5
2 4 6
1 3 5
2 4 6
1 3 5
2 4 6
1 3 5
2 4 6
1 3 5
2 4 6
1 3 5
2 4 6